Android使用xml自定义软键盘效果（附源码）

Android使用xml自定义软键盘效果原理：
1,软键盘其实是个控件，使用android.inputmethodserver.KeyboardView类定义。
2，主布局中使用帧布局，当我们需要显示软键盘时设置为可见，不需要时设置为不可见。
3，编写xml文件，定义键盘内容。使用xml文件填充KeyBoardView布局
4，设置EditText的监听事件。
完成键盘开发。

上效果图：

1,源码研究android.inputmethodserver.KeyboardView:

/** Copyright (C) 2008-2009 Google Inc.* * Licensed under the Apache License, Version 2.0 (the "License"); you may not* use this file except in compliance with the License. You may obtain a copy of* the License at* * http://www.apache.org/licenses/LICENSE-2.0* * Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the* License for the specific language governing permissions and limitations under* the License.*/package android.inputmethodservice;import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.Paint.Align;
import android.graphics.Region.Op;
import android.graphics.drawable.Drawable;
import android.inputmethodservice.Keyboard.Key;
import android.media.AudioManager;
import android.os.Handler;
import android.os.Message;
import android.provider.Settings;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup.LayoutParams;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.widget.PopupWindow;
import android.widget.TextView;import com.android.internal.R;import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** A view that renders a virtual {@link Keyboard}. It handles rendering of keys and* detecting key presses and touch movements.* * @attr ref android.R.styleable#KeyboardView_keyBackground* @attr ref android.R.styleable#KeyboardView_keyPreviewLayout* @attr ref android.R.styleable#KeyboardView_keyPreviewOffset* @attr ref android.R.styleable#KeyboardView_labelTextSize* @attr ref android.R.styleable#KeyboardView_keyTextSize* @attr ref android.R.styleable#KeyboardView_keyTextColor* @attr ref android.R.styleable#KeyboardView_verticalCorrection* @attr ref android.R.styleable#KeyboardView_popupLayout*/
public class KeyboardView extends View implements View.OnClickListener {/*** Listener for virtual keyboard events.*/public interface OnKeyboardActionListener {/*** Called when the user presses a key. This is sent before the {@link #onKey} is called.* For keys that repeat, this is only called once.* @param primaryCode the unicode of the key being pressed. If the touch is not on a valid* key, the value will be zero.*/void onPress(int primaryCode);/*** Called when the user releases a key. This is sent after the {@link #onKey} is called.* For keys that repeat, this is only called once.* @param primaryCode the code of the key that was released*/void onRelease(int primaryCode);/*** Send a key press to the listener.* @param primaryCode this is the key that was pressed* @param keyCodes the codes for all the possible alternative keys* with the primary code being the first. If the primary key code is* a single character such as an alphabet or number or symbol, the alternatives* will include other characters that may be on the same key or adjacent keys.* These codes are useful to correct for accidental presses of a key adjacent to* the intended key.*/void onKey(int primaryCode, int[] keyCodes);/*** Sends a sequence of characters to the listener.* @param text the sequence of characters to be displayed.*/void onText(CharSequence text);/*** Called when the user quickly moves the finger from right to left.*/void swipeLeft();/*** Called when the user quickly moves the finger from left to right.*/void swipeRight();/*** Called when the user quickly moves the finger from up to down.*/void swipeDown();/*** Called when the user quickly moves the finger from down to up.*/void swipeUp();}private static final boolean DEBUG = false;private static final int NOT_A_KEY = -1;private static final int[] KEY_DELETE = { Keyboard.KEYCODE_DELETE };private static final int[] LONG_PRESSABLE_STATE_SET = { R.attr.state_long_pressable };   private Keyboard mKeyboard;private int mCurrentKeyIndex = NOT_A_KEY;private int mLabelTextSize;private int mKeyTextSize;private int mKeyTextColor;private float mShadowRadius;private int mShadowColor;private float mBackgroundDimAmount;private TextView mPreviewText;private PopupWindow mPreviewPopup;private int mPreviewTextSizeLarge;private int mPreviewOffset;private int mPreviewHeight;// Working variableprivate final int[] mCoordinates = new int[2];private PopupWindow mPopupKeyboard;private View mMiniKeyboardContainer;private KeyboardView mMiniKeyboard;private boolean mMiniKeyboardOnScreen;private View mPopupParent;private int mMiniKeyboardOffsetX;private int mMiniKeyboardOffsetY;private Map<Key,View> mMiniKeyboardCache;private Key[] mKeys;/** Listener for {@link OnKeyboardActionListener}. */private OnKeyboardActionListener mKeyboardActionListener;private static final int MSG_SHOW_PREVIEW = 1;private static final int MSG_REMOVE_PREVIEW = 2;private static final int MSG_REPEAT = 3;private static final int MSG_LONGPRESS = 4;private static final int DELAY_BEFORE_PREVIEW = 0;private static final int DELAY_AFTER_PREVIEW = 70;private static final int DEBOUNCE_TIME = 70;private int mVerticalCorrection;private int mProximityThreshold;private boolean mPreviewCentered = false;private boolean mShowPreview = true;private boolean mShowTouchPoints = true;private int mPopupPreviewX;private int mPopupPreviewY;private int mLastX;private int mLastY;private int mStartX;private int mStartY;private boolean mProximityCorrectOn;private Paint mPaint;private Rect mPadding;private long mDownTime;private long mLastMoveTime;private int mLastKey;private int mLastCodeX;private int mLastCodeY;private int mCurrentKey = NOT_A_KEY;private int mDownKey = NOT_A_KEY;private long mLastKeyTime;private long mCurrentKeyTime;private int[] mKeyIndices = new int[12];private GestureDetector mGestureDetector;private int mPopupX;private int mPopupY;private int mRepeatKeyIndex = NOT_A_KEY;private int mPopupLayout;private boolean mAbortKey;private Key mInvalidatedKey;private Rect mClipRegion = new Rect(0, 0, 0, 0);private boolean mPossiblePoly;private SwipeTracker mSwipeTracker = new SwipeTracker();private int mSwipeThreshold;private boolean mDisambiguateSwipe;// Variables for dealing with multiple pointersprivate int mOldPointerCount = 1;private float mOldPointerX;private float mOldPointerY;private Drawable mKeyBackground;private static final int REPEAT_INTERVAL = 50; // ~20 keys per secondprivate static final int REPEAT_START_DELAY = 400;private static final int LONGPRESS_TIMEOUT = ViewConfiguration.getLongPressTimeout();private static int MAX_NEARBY_KEYS = 12;private int[] mDistances = new int[MAX_NEARBY_KEYS];// For multi-tapprivate int mLastSentIndex;private int mTapCount;private long mLastTapTime;private boolean mInMultiTap;private static final int MULTITAP_INTERVAL = 800; // millisecondsprivate StringBuilder mPreviewLabel = new StringBuilder(1);/** Whether the keyboard bitmap needs to be redrawn before it's blitted. **/private boolean mDrawPending;/** The dirty region in the keyboard bitmap */private Rect mDirtyRect = new Rect();/** The keyboard bitmap for faster updates */private Bitmap mBuffer;/** Notes if the keyboard just changed, so that we could possibly reallocate the mBuffer. */private boolean mKeyboardChanged;/** The canvas for the above mutable keyboard bitmap */private Canvas mCanvas;/** The accessibility manager for accessibility support */private AccessibilityManager mAccessibilityManager;/** The audio manager for accessibility support */private AudioManager mAudioManager;/** Whether the requirement of a headset to hear passwords if accessibility is enabled is announced. */private boolean mHeadsetRequiredToHearPasswordsAnnounced;Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case MSG_SHOW_PREVIEW:showKey(msg.arg1);break;case MSG_REMOVE_PREVIEW:mPreviewText.setVisibility(INVISIBLE);break;case MSG_REPEAT:if (repeatKey()) {Message repeat = Message.obtain(this, MSG_REPEAT);sendMessageDelayed(repeat, REPEAT_INTERVAL);                        }break;case MSG_LONGPRESS:openPopupIfRequired((MotionEvent) msg.obj);break;}}};public KeyboardView(Context context, AttributeSet attrs) {this(context, attrs, com.android.internal.R.attr.keyboardViewStyle);}public KeyboardView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);TypedArray a =context.obtainStyledAttributes(attrs, android.R.styleable.KeyboardView, defStyle, 0);LayoutInflater inflate =(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);int previewLayout = 0;int keyTextSize = 0;int n = a.getIndexCount();for (int i = 0; i < n; i++) {int attr = a.getIndex(i);switch (attr) {case com.android.internal.R.styleable.KeyboardView_keyBackground:mKeyBackground = a.getDrawable(attr);break;case com.android.internal.R.styleable.KeyboardView_verticalCorrection:mVerticalCorrection = a.getDimensionPixelOffset(attr, 0);break;case com.android.internal.R.styleable.KeyboardView_keyPreviewLayout:previewLayout = a.getResourceId(attr, 0);break;case com.android.internal.R.styleable.KeyboardView_keyPreviewOffset:mPreviewOffset = a.getDimensionPixelOffset(attr, 0);break;case com.android.internal.R.styleable.KeyboardView_keyPreviewHeight:mPreviewHeight = a.getDimensionPixelSize(attr, 80);break;case com.android.internal.R.styleable.KeyboardView_keyTextSize:mKeyTextSize = a.getDimensionPixelSize(attr, 18);break;case com.android.internal.R.styleable.KeyboardView_keyTextColor:mKeyTextColor = a.getColor(attr, 0xFF000000);break;case com.android.internal.R.styleable.KeyboardView_labelTextSize:mLabelTextSize = a.getDimensionPixelSize(attr, 14);break;case com.android.internal.R.styleable.KeyboardView_popupLayout:mPopupLayout = a.getResourceId(attr, 0);break;case com.android.internal.R.styleable.KeyboardView_shadowColor:mShadowColor = a.getColor(attr, 0);break;case com.android.internal.R.styleable.KeyboardView_shadowRadius:mShadowRadius = a.getFloat(attr, 0f);break;}}a = mContext.obtainStyledAttributes(com.android.internal.R.styleable.Theme);mBackgroundDimAmount = a.getFloat(android.R.styleable.Theme_backgroundDimAmount, 0.5f);mPreviewPopup = new PopupWindow(context);if (previewLayout != 0) {mPreviewText = (TextView) inflate.inflate(previewLayout, null);mPreviewTextSizeLarge = (int) mPreviewText.getTextSize();mPreviewPopup.setContentView(mPreviewText);mPreviewPopup.setBackgroundDrawable(null);} else {mShowPreview = false;}mPreviewPopup.setTouchable(false);mPopupKeyboard = new PopupWindow(context);mPopupKeyboard.setBackgroundDrawable(null);//mPopupKeyboard.setClippingEnabled(false);mPopupParent = this;//mPredicting = true;mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setTextSize(keyTextSize);mPaint.setTextAlign(Align.CENTER);mPaint.setAlpha(255);mPadding = new Rect(0, 0, 0, 0);mMiniKeyboardCache = new HashMap<Key,View>();mKeyBackground.getPadding(mPadding);mSwipeThreshold = (int) (500 * getResources().getDisplayMetrics().density);mDisambiguateSwipe = getResources().getBoolean(com.android.internal.R.bool.config_swipeDisambiguation);mAccessibilityManager = AccessibilityManager.getInstance(context);mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);resetMultiTap();initGestureDetector();}private void initGestureDetector() {mGestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {@Overridepublic boolean onFling(MotionEvent me1, MotionEvent me2, float velocityX, float velocityY) {if (mPossiblePoly) return false;final float absX = Math.abs(velocityX);final float absY = Math.abs(velocityY);float deltaX = me2.getX() - me1.getX();float deltaY = me2.getY() - me1.getY();int travelX = getWidth() / 2; // Half the keyboard widthint travelY = getHeight() / 2; // Half the keyboard heightmSwipeTracker.computeCurrentVelocity(1000);final float endingVelocityX = mSwipeTracker.getXVelocity();final float endingVelocityY = mSwipeTracker.getYVelocity();boolean sendDownKey = false;if (velocityX > mSwipeThreshold && absY < absX && deltaX > travelX) {if (mDisambiguateSwipe && endingVelocityX < velocityX / 4) {sendDownKey = true;} else {swipeRight();return true;}} else if (velocityX < -mSwipeThreshold && absY < absX && deltaX < -travelX) {if (mDisambiguateSwipe && endingVelocityX > velocityX / 4) {sendDownKey = true;} else {swipeLeft();return true;}} else if (velocityY < -mSwipeThreshold && absX < absY && deltaY < -travelY) {if (mDisambiguateSwipe && endingVelocityY > velocityY / 4) {sendDownKey = true;} else {swipeUp();return true;}} else if (velocityY > mSwipeThreshold && absX < absY / 2 && deltaY > travelY) {if (mDisambiguateSwipe && endingVelocityY < velocityY / 4) {sendDownKey = true;} else {swipeDown();return true;}}if (sendDownKey) {detectAndSendKey(mDownKey, mStartX, mStartY, me1.getEventTime());}return false;}});mGestureDetector.setIsLongpressEnabled(false);}public void setOnKeyboardActionListener(OnKeyboardActionListener listener) {mKeyboardActionListener = listener;}/*** Returns the {@link OnKeyboardActionListener} object.* @return the listener attached to this keyboard*/protected OnKeyboardActionListener getOnKeyboardActionListener() {return mKeyboardActionListener;}/*** Attaches a keyboard to this view. The keyboard can be switched at any time and the* view will re-layout itself to accommodate the keyboard.* @see Keyboard* @see #getKeyboard()* @param keyboard the keyboard to display in this view*/public void setKeyboard(Keyboard keyboard) {if (mKeyboard != null) {showPreview(NOT_A_KEY);}// Remove any pending messagesremoveMessages();mKeyboard = keyboard;List<Key> keys = mKeyboard.getKeys();mKeys = keys.toArray(new Key[keys.size()]);requestLayout();// Hint to reallocate the buffer if the size changedmKeyboardChanged = true;invalidateAllKeys();computeProximityThreshold(keyboard);mMiniKeyboardCache.clear(); // Not really necessary to do every time, but will free up views// Switching to a different keyboard should abort any pending keys so that the key up// doesn't get delivered to the old or new keyboardmAbortKey = true; // Until the next ACTION_DOWN}/*** Returns the current keyboard being displayed by this view.* @return the currently attached keyboard* @see #setKeyboard(Keyboard)*/public Keyboard getKeyboard() {return mKeyboard;}/*** Sets the state of the shift key of the keyboard, if any.* @param shifted whether or not to enable the state of the shift key* @return true if the shift key state changed, false if there was no change* @see KeyboardView#isShifted()*/public boolean setShifted(boolean shifted) {if (mKeyboard != null) {if (mKeyboard.setShifted(shifted)) {// The whole keyboard probably needs to be redrawninvalidateAllKeys();return true;}}return false;}/*** Returns the state of the shift key of the keyboard, if any.* @return true if the shift is in a pressed state, false otherwise. If there is* no shift key on the keyboard or there is no keyboard attached, it returns false.* @see KeyboardView#setShifted(boolean)*/public boolean isShifted() {if (mKeyboard != null) {return mKeyboard.isShifted();}return false;}/*** Enables or disables the key feedback popup. This is a popup that shows a magnified* version of the depressed key. By default the preview is enabled. * @param previewEnabled whether or not to enable the key feedback popup* @see #isPreviewEnabled()*/public void setPreviewEnabled(boolean previewEnabled) {mShowPreview = previewEnabled;}/*** Returns the enabled state of the key feedback popup.* @return whether or not the key feedback popup is enabled* @see #setPreviewEnabled(boolean)*/public boolean isPreviewEnabled() {return mShowPreview;}public void setVerticalCorrection(int verticalOffset) {}public void setPopupParent(View v) {mPopupParent = v;}public void setPopupOffset(int x, int y) {mMiniKeyboardOffsetX = x;mMiniKeyboardOffsetY = y;if (mPreviewPopup.isShowing()) {mPreviewPopup.dismiss();}}/*** When enabled, calls to {@link OnKeyboardActionListener#onKey} will include key* codes for adjacent keys.  When disabled, only the primary key code will be* reported.* @param enabled whether or not the proximity correction is enabled*/public void setProximityCorrectionEnabled(boolean enabled) {mProximityCorrectOn = enabled;}/*** Returns true if proximity correction is enabled.*/public boolean isProximityCorrectionEnabled() {return mProximityCorrectOn;}/** * Popup keyboard close button clicked.* @hide */public void onClick(View v) {dismissPopupKeyboard();}private CharSequence adjustCase(CharSequence label) {if (mKeyboard.isShifted() && label != null && label.length() < 3&& Character.isLowerCase(label.charAt(0))) {label = label.toString().toUpperCase();}return label;}@Overridepublic void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// Round up a littleif (mKeyboard == null) {setMeasuredDimension(mPaddingLeft + mPaddingRight, mPaddingTop + mPaddingBottom);} else {int width = mKeyboard.getMinWidth() + mPaddingLeft + mPaddingRight;if (MeasureSpec.getSize(widthMeasureSpec) < width + 10) {width = MeasureSpec.getSize(widthMeasureSpec);}setMeasuredDimension(width, mKeyboard.getHeight() + mPaddingTop + mPaddingBottom);}}/*** Compute the average distance between adjacent keys (horizontally and vertically)* and square it to get the proximity threshold. We use a square here and in computing* the touch distance from a key's center to avoid taking a square root.* @param keyboard*/private void computeProximityThreshold(Keyboard keyboard) {if (keyboard == null) return;final Key[] keys = mKeys;if (keys == null) return;int length = keys.length;int dimensionSum = 0;for (int i = 0; i < length; i++) {Key key = keys[i];dimensionSum += Math.min(key.width, key.height) + key.gap;}if (dimensionSum < 0 || length == 0) return;mProximityThreshold = (int) (dimensionSum * 1.4f / length);mProximityThreshold *= mProximityThreshold; // Square it}@Overridepublic void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);if (mKeyboard != null) {mKeyboard.resize(w, h);}// Release the buffer, if any and it will be reallocated on the next drawmBuffer = null;}@Overridepublic void onDraw(Canvas canvas) {super.onDraw(canvas);if (mDrawPending || mBuffer == null || mKeyboardChanged) {onBufferDraw();}canvas.drawBitmap(mBuffer, 0, 0, null);}private void onBufferDraw() {if (mBuffer == null || mKeyboardChanged) {if (mBuffer == null || mKeyboardChanged &&(mBuffer.getWidth() != getWidth() || mBuffer.getHeight() != getHeight())) {// Make sure our bitmap is at least 1x1final int width = Math.max(1, getWidth());final int height = Math.max(1, getHeight());mBuffer = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);mCanvas = new Canvas(mBuffer);}invalidateAllKeys();mKeyboardChanged = false;}final Canvas canvas = mCanvas;canvas.clipRect(mDirtyRect, Op.REPLACE);if (mKeyboard == null) return;final Paint paint = mPaint;final Drawable keyBackground = mKeyBackground;final Rect clipRegion = mClipRegion;final Rect padding = mPadding;final int kbdPaddingLeft = mPaddingLeft;final int kbdPaddingTop = mPaddingTop;final Key[] keys = mKeys;final Key invalidKey = mInvalidatedKey;paint.setColor(mKeyTextColor);boolean drawSingleKey = false;if (invalidKey != null && canvas.getClipBounds(clipRegion)) {// Is clipRegion completely contained within the invalidated key?if (invalidKey.x + kbdPaddingLeft - 1 <= clipRegion.left &&invalidKey.y + kbdPaddingTop - 1 <= clipRegion.top &&invalidKey.x + invalidKey.width + kbdPaddingLeft + 1 >= clipRegion.right &&invalidKey.y + invalidKey.height + kbdPaddingTop + 1 >= clipRegion.bottom) {drawSingleKey = true;}}canvas.drawColor(0x00000000, PorterDuff.Mode.CLEAR);final int keyCount = keys.length;for (int i = 0; i < keyCount; i++) {final Key key = keys[i];if (drawSingleKey && invalidKey != key) {continue;}int[] drawableState = key.getCurrentDrawableState();keyBackground.setState(drawableState);// Switch the character to uppercase if shift is pressedString label = key.label == null? null : adjustCase(key.label).toString();final Rect bounds = keyBackground.getBounds();if (key.width != bounds.right || key.height != bounds.bottom) {keyBackground.setBounds(0, 0, key.width, key.height);}canvas.translate(key.x + kbdPaddingLeft, key.y + kbdPaddingTop);keyBackground.draw(canvas);if (label != null) {// For characters, use large font. For labels like "Done", use small font.if (label.length() > 1 && key.codes.length < 2) {paint.setTextSize(mLabelTextSize);paint.setTypeface(Typeface.DEFAULT_BOLD);} else {paint.setTextSize(mKeyTextSize);paint.setTypeface(Typeface.DEFAULT);}// Draw a drop shadow for the textpaint.setShadowLayer(mShadowRadius, 0, 0, mShadowColor);// Draw the textcanvas.drawText(label,(key.width - padding.left - padding.right) / 2+ padding.left,(key.height - padding.top - padding.bottom) / 2+ (paint.getTextSize() - paint.descent()) / 2 + padding.top,paint);// Turn off drop shadowpaint.setShadowLayer(0, 0, 0, 0);} else if (key.icon != null) {final int drawableX = (key.width - padding.left - padding.right - key.icon.getIntrinsicWidth()) / 2 + padding.left;final int drawableY = (key.height - padding.top - padding.bottom - key.icon.getIntrinsicHeight()) / 2 + padding.top;canvas.translate(drawableX, drawableY);key.icon.setBounds(0, 0, key.icon.getIntrinsicWidth(), key.icon.getIntrinsicHeight());key.icon.draw(canvas);canvas.translate(-drawableX, -drawableY);}canvas.translate(-key.x - kbdPaddingLeft, -key.y - kbdPaddingTop);}mInvalidatedKey = null;// Overlay a dark rectangle to dim the keyboardif (mMiniKeyboardOnScreen) {paint.setColor((int) (mBackgroundDimAmount * 0xFF) << 24);canvas.drawRect(0, 0, getWidth(), getHeight(), paint);}if (DEBUG && mShowTouchPoints) {paint.setAlpha(128);paint.setColor(0xFFFF0000);canvas.drawCircle(mStartX, mStartY, 3, paint);canvas.drawLine(mStartX, mStartY, mLastX, mLastY, paint);paint.setColor(0xFF0000FF);canvas.drawCircle(mLastX, mLastY, 3, paint);paint.setColor(0xFF00FF00);canvas.drawCircle((mStartX + mLastX) / 2, (mStartY + mLastY) / 2, 2, paint);}mDrawPending = false;mDirtyRect.setEmpty();}private int getKeyIndices(int x, int y, int[] allKeys) {final Key[] keys = mKeys;int primaryIndex = NOT_A_KEY;int closestKey = NOT_A_KEY;int closestKeyDist = mProximityThreshold + 1;java.util.Arrays.fill(mDistances, Integer.MAX_VALUE);int [] nearestKeyIndices = mKeyboard.getNearestKeys(x, y);final int keyCount = nearestKeyIndices.length;for (int i = 0; i < keyCount; i++) {final Key key = keys[nearestKeyIndices[i]];int dist = 0;boolean isInside = key.isInside(x,y);if (isInside) {primaryIndex = nearestKeyIndices[i];}if (((mProximityCorrectOn && (dist = key.squaredDistanceFrom(x, y)) < mProximityThreshold) || isInside)&& key.codes[0] > 32) {// Find insertion pointfinal int nCodes = key.codes.length;if (dist < closestKeyDist) {closestKeyDist = dist;closestKey = nearestKeyIndices[i];}if (allKeys == null) continue;for (int j = 0; j < mDistances.length; j++) {if (mDistances[j] > dist) {// Make space for nCodes codesSystem.arraycopy(mDistances, j, mDistances, j + nCodes,mDistances.length - j - nCodes);System.arraycopy(allKeys, j, allKeys, j + nCodes,allKeys.length - j - nCodes);for (int c = 0; c < nCodes; c++) {allKeys[j + c] = key.codes[c];mDistances[j + c] = dist;}break;}}}}if (primaryIndex == NOT_A_KEY) {primaryIndex = closestKey;}return primaryIndex;}private void detectAndSendKey(int index, int x, int y, long eventTime) {if (index != NOT_A_KEY && index < mKeys.length) {final Key key = mKeys[index];if (key.text != null) {mKeyboardActionListener.onText(key.text);mKeyboardActionListener.onRelease(NOT_A_KEY);} else {int code = key.codes[0];//TextEntryState.keyPressedAt(key, x, y);int[] codes = new int[MAX_NEARBY_KEYS];Arrays.fill(codes, NOT_A_KEY);getKeyIndices(x, y, codes);// Multi-tapif (mInMultiTap) {if (mTapCount != -1) {mKeyboardActionListener.onKey(Keyboard.KEYCODE_DELETE, KEY_DELETE);} else {mTapCount = 0;}code = key.codes[mTapCount];}mKeyboardActionListener.onKey(code, codes);mKeyboardActionListener.onRelease(code);}mLastSentIndex = index;mLastTapTime = eventTime;}}/*** Handle multi-tap keys by producing the key label for the current multi-tap state.*/private CharSequence getPreviewText(Key key) {if (mInMultiTap) {// Multi-tapmPreviewLabel.setLength(0);mPreviewLabel.append((char) key.codes[mTapCount < 0 ? 0 : mTapCount]);return adjustCase(mPreviewLabel);} else {return adjustCase(key.label);}}private void showPreview(int keyIndex) {int oldKeyIndex = mCurrentKeyIndex;final PopupWindow previewPopup = mPreviewPopup;mCurrentKeyIndex = keyIndex;// Release the old key and press the new keyfinal Key[] keys = mKeys;if (oldKeyIndex != mCurrentKeyIndex) {if (oldKeyIndex != NOT_A_KEY && keys.length > oldKeyIndex) {Key oldKey = keys[oldKeyIndex];oldKey.onReleased(mCurrentKeyIndex == NOT_A_KEY);invalidateKey(oldKeyIndex);sendAccessibilityEventForUnicodeCharacter(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT,oldKey.codes[0]);}if (mCurrentKeyIndex != NOT_A_KEY && keys.length > mCurrentKeyIndex) {Key newKey = keys[mCurrentKeyIndex];newKey.onPressed();invalidateKey(mCurrentKeyIndex);sendAccessibilityEventForUnicodeCharacter(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER,newKey.codes[0]);}}// If key changed and preview is on ...if (oldKeyIndex != mCurrentKeyIndex && mShowPreview) {mHandler.removeMessages(MSG_SHOW_PREVIEW);if (previewPopup.isShowing()) {if (keyIndex == NOT_A_KEY) {mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_REMOVE_PREVIEW), DELAY_AFTER_PREVIEW);}}if (keyIndex != NOT_A_KEY) {if (previewPopup.isShowing() && mPreviewText.getVisibility() == VISIBLE) {// Show right away, if it's already visible and finger is moving aroundshowKey(keyIndex);} else {mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_SHOW_PREVIEW, keyIndex, 0), DELAY_BEFORE_PREVIEW);}}}}private void showKey(final int keyIndex) {final PopupWindow previewPopup = mPreviewPopup;final Key[] keys = mKeys;if (keyIndex < 0 || keyIndex >= mKeys.length) return;Key key = keys[keyIndex];if (key.icon != null) {mPreviewText.setCompoundDrawables(null, null, null, key.iconPreview != null ? key.iconPreview : key.icon);mPreviewText.setText(null);} else {mPreviewText.setCompoundDrawables(null, null, null, null);mPreviewText.setText(getPreviewText(key));if (key.label.length() > 1 && key.codes.length < 2) {mPreviewText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mKeyTextSize);mPreviewText.setTypeface(Typeface.DEFAULT_BOLD);} else {mPreviewText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mPreviewTextSizeLarge);mPreviewText.setTypeface(Typeface.DEFAULT);}}mPreviewText.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));int popupWidth = Math.max(mPreviewText.getMeasuredWidth(), key.width + mPreviewText.getPaddingLeft() + mPreviewText.getPaddingRight());final int popupHeight = mPreviewHeight;LayoutParams lp = mPreviewText.getLayoutParams();if (lp != null) {lp.width = popupWidth;lp.height = popupHeight;}if (!mPreviewCentered) {mPopupPreviewX = key.x - mPreviewText.getPaddingLeft() + mPaddingLeft;mPopupPreviewY = key.y - popupHeight + mPreviewOffset;} else {// TODO: Fix this if centering is brought backmPopupPreviewX = 160 - mPreviewText.getMeasuredWidth() / 2;mPopupPreviewY = - mPreviewText.getMeasuredHeight();}mHandler.removeMessages(MSG_REMOVE_PREVIEW);getLocationInWindow(mCoordinates);mCoordinates[0] += mMiniKeyboardOffsetX; // Offset may be zeromCoordinates[1] += mMiniKeyboardOffsetY; // Offset may be zero// Set the preview background statemPreviewText.getBackground().setState(key.popupResId != 0 ? LONG_PRESSABLE_STATE_SET : EMPTY_STATE_SET);mPopupPreviewX += mCoordinates[0];mPopupPreviewY += mCoordinates[1];// If the popup cannot be shown above the key, put it on the sidegetLocationOnScreen(mCoordinates);if (mPopupPreviewY + mCoordinates[1] < 0) {// If the key you're pressing is on the left side of the keyboard, show the popup on// the right, offset by enough to see at least one key to the left/right.if (key.x + key.width <= getWidth() / 2) {mPopupPreviewX += (int) (key.width * 2.5);} else {mPopupPreviewX -= (int) (key.width * 2.5);}mPopupPreviewY += popupHeight;}if (previewPopup.isShowing()) {previewPopup.update(mPopupPreviewX, mPopupPreviewY,popupWidth, popupHeight);} else {previewPopup.setWidth(popupWidth);previewPopup.setHeight(popupHeight);previewPopup.showAtLocation(mPopupParent, Gravity.NO_GRAVITY, mPopupPreviewX, mPopupPreviewY);}mPreviewText.setVisibility(VISIBLE);}private void sendAccessibilityEventForUnicodeCharacter(int eventType, int code) {if (mAccessibilityManager.isEnabled()) {AccessibilityEvent event = AccessibilityEvent.obtain(eventType);onInitializeAccessibilityEvent(event);String text = null;// This is very efficient since the properties are cached.final boolean speakPassword = Settings.Secure.getInt(mContext.getContentResolver(),Settings.Secure.ACCESSIBILITY_SPEAK_PASSWORD, 0) != 0;// Add text only if password announcement is enabled or if headset is// used to avoid leaking passwords.if (speakPassword || mAudioManager.isBluetoothA2dpOn()|| mAudioManager.isWiredHeadsetOn()) {switch (code) {case Keyboard.KEYCODE_ALT:text = mContext.getString(R.string.keyboardview_keycode_alt);break;case Keyboard.KEYCODE_CANCEL:text = mContext.getString(R.string.keyboardview_keycode_cancel);break;case Keyboard.KEYCODE_DELETE:text = mContext.getString(R.string.keyboardview_keycode_delete);break;case Keyboard.KEYCODE_DONE:text = mContext.getString(R.string.keyboardview_keycode_done);break;case Keyboard.KEYCODE_MODE_CHANGE:text = mContext.getString(R.string.keyboardview_keycode_mode_change);break;case Keyboard.KEYCODE_SHIFT:text = mContext.getString(R.string.keyboardview_keycode_shift);break;case '\n':text = mContext.getString(R.string.keyboardview_keycode_enter);break;default:text = String.valueOf((char) code);}} else if (!mHeadsetRequiredToHearPasswordsAnnounced) {// We want the waring for required head set to be send with both the// hover enter and hover exit event, so set the flag after the exit.if (eventType == AccessibilityEvent.TYPE_VIEW_HOVER_EXIT) {mHeadsetRequiredToHearPasswordsAnnounced = true;}text = mContext.getString(R.string.keyboard_headset_required_to_hear_password);} else {text = mContext.getString(R.string.keyboard_password_character_no_headset);}event.getText().add(text);mAccessibilityManager.sendAccessibilityEvent(event);}}/*** Requests a redraw of the entire keyboard. Calling {@link #invalidate} is not sufficient* because the keyboard renders the keys to an off-screen buffer and an invalidate() only * draws the cached buffer.* @see #invalidateKey(int)*/public void invalidateAllKeys() {mDirtyRect.union(0, 0, getWidth(), getHeight());mDrawPending = true;invalidate();}/*** Invalidates a key so that it will be redrawn on the next repaint. Use this method if only* one key is changing it's content. Any changes that affect the position or size of the key* may not be honored.* @param keyIndex the index of the key in the attached {@link Keyboard}.* @see #invalidateAllKeys*/public void invalidateKey(int keyIndex) {if (mKeys == null) return;if (keyIndex < 0 || keyIndex >= mKeys.length) {return;}final Key key = mKeys[keyIndex];mInvalidatedKey = key;mDirtyRect.union(key.x + mPaddingLeft, key.y + mPaddingTop, key.x + key.width + mPaddingLeft, key.y + key.height + mPaddingTop);onBufferDraw();invalidate(key.x + mPaddingLeft, key.y + mPaddingTop, key.x + key.width + mPaddingLeft, key.y + key.height + mPaddingTop);}private boolean openPopupIfRequired(MotionEvent me) {// Check if we have a popup layout specified first.if (mPopupLayout == 0) {return false;}if (mCurrentKey < 0 || mCurrentKey >= mKeys.length) {return false;}Key popupKey = mKeys[mCurrentKey];        boolean result = onLongPress(popupKey);if (result) {mAbortKey = true;showPreview(NOT_A_KEY);}return result;}/*** Called when a key is long pressed. By default this will open any popup keyboard associated* with this key through the attributes popupLayout and popupCharacters.* @param popupKey the key that was long pressed* @return true if the long press is handled, false otherwise. Subclasses should call the* method on the base class if the subclass doesn't wish to handle the call.*/protected boolean onLongPress(Key popupKey) {int popupKeyboardId = popupKey.popupResId;if (popupKeyboardId != 0) {mMiniKeyboardContainer = mMiniKeyboardCache.get(popupKey);if (mMiniKeyboardContainer == null) {LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);mMiniKeyboardContainer = inflater.inflate(mPopupLayout, null);mMiniKeyboard = (KeyboardView) mMiniKeyboardContainer.findViewById(com.android.internal.R.id.keyboardView);View closeButton = mMiniKeyboardContainer.findViewById(com.android.internal.R.id.closeButton);if (closeButton != null) closeButton.setOnClickListener(this);mMiniKeyboard.setOnKeyboardActionListener(new OnKeyboardActionListener() {public void onKey(int primaryCode, int[] keyCodes) {mKeyboardActionListener.onKey(primaryCode, keyCodes);dismissPopupKeyboard();}public void onText(CharSequence text) {mKeyboardActionListener.onText(text);dismissPopupKeyboard();}public void swipeLeft() { }public void swipeRight() { }public void swipeUp() { }public void swipeDown() { }public void onPress(int primaryCode) {mKeyboardActionListener.onPress(primaryCode);}public void onRelease(int primaryCode) {mKeyboardActionListener.onRelease(primaryCode);}});//mInputView.setSuggest(mSuggest);Keyboard keyboard;if (popupKey.popupCharacters != null) {keyboard = new Keyboard(getContext(), popupKeyboardId, popupKey.popupCharacters, -1, getPaddingLeft() + getPaddingRight());} else {keyboard = new Keyboard(getContext(), popupKeyboardId);}mMiniKeyboard.setKeyboard(keyboard);mMiniKeyboard.setPopupParent(this);mMiniKeyboardContainer.measure(MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.AT_MOST), MeasureSpec.makeMeasureSpec(getHeight(), MeasureSpec.AT_MOST));mMiniKeyboardCache.put(popupKey, mMiniKeyboardContainer);} else {mMiniKeyboard = (KeyboardView) mMiniKeyboardContainer.findViewById(com.android.internal.R.id.keyboardView);}getLocationInWindow(mCoordinates);mPopupX = popupKey.x + mPaddingLeft;mPopupY = popupKey.y + mPaddingTop;mPopupX = mPopupX + popupKey.width - mMiniKeyboardContainer.getMeasuredWidth();mPopupY = mPopupY - mMiniKeyboardContainer.getMeasuredHeight();final int x = mPopupX + mMiniKeyboardContainer.getPaddingRight() + mCoordinates[0];final int y = mPopupY + mMiniKeyboardContainer.getPaddingBottom() + mCoordinates[1];mMiniKeyboard.setPopupOffset(x < 0 ? 0 : x, y);mMiniKeyboard.setShifted(isShifted());mPopupKeyboard.setContentView(mMiniKeyboardContainer);mPopupKeyboard.setWidth(mMiniKeyboardContainer.getMeasuredWidth());mPopupKeyboard.setHeight(mMiniKeyboardContainer.getMeasuredHeight());mPopupKeyboard.showAtLocation(this, Gravity.NO_GRAVITY, x, y);mMiniKeyboardOnScreen = true;//mMiniKeyboard.onTouchEvent(getTranslatedEvent(me));invalidateAllKeys();return true;}return false;}@Overridepublic boolean onHoverEvent(MotionEvent event) {if (mAccessibilityManager.isTouchExplorationEnabled() && event.getPointerCount() == 1) {final int action = event.getAction();switch (action) {case MotionEvent.ACTION_HOVER_ENTER:case MotionEvent.ACTION_HOVER_MOVE:final int touchX = (int) event.getX() - mPaddingLeft;int touchY = (int) event.getY() - mPaddingTop;if (touchY >= -mVerticalCorrection) {touchY += mVerticalCorrection;}final int keyIndex = getKeyIndices(touchX, touchY, null);showPreview(keyIndex);break;case MotionEvent.ACTION_HOVER_EXIT:showPreview(NOT_A_KEY);break;}}return true;}@Overridepublic boolean onTouchEvent(MotionEvent me) {// Convert multi-pointer up/down events to single up/down events to // deal with the typical multi-pointer behavior of two-thumb typingfinal int pointerCount = me.getPointerCount();final int action = me.getAction();boolean result = false;final long now = me.getEventTime();if (pointerCount != mOldPointerCount) {if (pointerCount == 1) {// Send a down event for the latest pointerMotionEvent down = MotionEvent.obtain(now, now, MotionEvent.ACTION_DOWN,me.getX(), me.getY(), me.getMetaState());result = onModifiedTouchEvent(down, false);down.recycle();// If it's an up action, then deliver the up as well.if (action == MotionEvent.ACTION_UP) {result = onModifiedTouchEvent(me, true);}} else {// Send an up event for the last pointerMotionEvent up = MotionEvent.obtain(now, now, MotionEvent.ACTION_UP,mOldPointerX, mOldPointerY, me.getMetaState());result = onModifiedTouchEvent(up, true);up.recycle();}} else {if (pointerCount == 1) {result = onModifiedTouchEvent(me, false);mOldPointerX = me.getX();mOldPointerY = me.getY();} else {// Don't do anything when 2 pointers are down and moving.result = true;}}mOldPointerCount = pointerCount;return result;}private boolean onModifiedTouchEvent(MotionEvent me, boolean possiblePoly) {int touchX = (int) me.getX() - mPaddingLeft;int touchY = (int) me.getY() - mPaddingTop;if (touchY >= -mVerticalCorrection)touchY += mVerticalCorrection;final int action = me.getAction();final long eventTime = me.getEventTime();int keyIndex = getKeyIndices(touchX, touchY, null);mPossiblePoly = possiblePoly;// Track the last few movements to look for spurious swipes.if (action == MotionEvent.ACTION_DOWN) mSwipeTracker.clear();mSwipeTracker.addMovement(me);// Ignore all motion events until a DOWN.if (mAbortKey&& action != MotionEvent.ACTION_DOWN && action != MotionEvent.ACTION_CANCEL) {return true;}if (mGestureDetector.onTouchEvent(me)) {showPreview(NOT_A_KEY);mHandler.removeMessages(MSG_REPEAT);mHandler.removeMessages(MSG_LONGPRESS);return true;}// Needs to be called after the gesture detector gets a turn, as it may have// displayed the mini keyboardif (mMiniKeyboardOnScreen && action != MotionEvent.ACTION_CANCEL) {return true;}switch (action) {case MotionEvent.ACTION_DOWN:mAbortKey = false;mStartX = touchX;mStartY = touchY;mLastCodeX = touchX;mLastCodeY = touchY;mLastKeyTime = 0;mCurrentKeyTime = 0;mLastKey = NOT_A_KEY;mCurrentKey = keyIndex;mDownKey = keyIndex;mDownTime = me.getEventTime();mLastMoveTime = mDownTime;checkMultiTap(eventTime, keyIndex);mKeyboardActionListener.onPress(keyIndex != NOT_A_KEY ? mKeys[keyIndex].codes[0] : 0);if (mCurrentKey >= 0 && mKeys[mCurrentKey].repeatable) {mRepeatKeyIndex = mCurrentKey;Message msg = mHandler.obtainMessage(MSG_REPEAT);mHandler.sendMessageDelayed(msg, REPEAT_START_DELAY);repeatKey();// Delivering the key could have caused an abortif (mAbortKey) {mRepeatKeyIndex = NOT_A_KEY;break;}}if (mCurrentKey != NOT_A_KEY) {Message msg = mHandler.obtainMessage(MSG_LONGPRESS, me);mHandler.sendMessageDelayed(msg, LONGPRESS_TIMEOUT);}showPreview(keyIndex);break;case MotionEvent.ACTION_MOVE:boolean continueLongPress = false;if (keyIndex != NOT_A_KEY) {if (mCurrentKey == NOT_A_KEY) {mCurrentKey = keyIndex;mCurrentKeyTime = eventTime - mDownTime;} else {if (keyIndex == mCurrentKey) {mCurrentKeyTime += eventTime - mLastMoveTime;continueLongPress = true;} else if (mRepeatKeyIndex == NOT_A_KEY) {resetMultiTap();mLastKey = mCurrentKey;mLastCodeX = mLastX;mLastCodeY = mLastY;mLastKeyTime =mCurrentKeyTime + eventTime - mLastMoveTime;mCurrentKey = keyIndex;mCurrentKeyTime = 0;}}}if (!continueLongPress) {// Cancel old longpressmHandler.removeMessages(MSG_LONGPRESS);// Start new longpress if key has changedif (keyIndex != NOT_A_KEY) {Message msg = mHandler.obtainMessage(MSG_LONGPRESS, me);mHandler.sendMessageDelayed(msg, LONGPRESS_TIMEOUT);}}showPreview(mCurrentKey);mLastMoveTime = eventTime;break;case MotionEvent.ACTION_UP:removeMessages();if (keyIndex == mCurrentKey) {mCurrentKeyTime += eventTime - mLastMoveTime;} else {resetMultiTap();mLastKey = mCurrentKey;mLastKeyTime = mCurrentKeyTime + eventTime - mLastMoveTime;mCurrentKey = keyIndex;mCurrentKeyTime = 0;}if (mCurrentKeyTime < mLastKeyTime && mCurrentKeyTime < DEBOUNCE_TIME&& mLastKey != NOT_A_KEY) {mCurrentKey = mLastKey;touchX = mLastCodeX;touchY = mLastCodeY;}showPreview(NOT_A_KEY);Arrays.fill(mKeyIndices, NOT_A_KEY);// If we're not on a repeating key (which sends on a DOWN event)if (mRepeatKeyIndex == NOT_A_KEY && !mMiniKeyboardOnScreen && !mAbortKey) {detectAndSendKey(mCurrentKey, touchX, touchY, eventTime);}invalidateKey(keyIndex);mRepeatKeyIndex = NOT_A_KEY;break;case MotionEvent.ACTION_CANCEL:removeMessages();dismissPopupKeyboard();mAbortKey = true;showPreview(NOT_A_KEY);invalidateKey(mCurrentKey);break;}mLastX = touchX;mLastY = touchY;return true;}private boolean repeatKey() {Key key = mKeys[mRepeatKeyIndex];detectAndSendKey(mCurrentKey, key.x, key.y, mLastTapTime);return true;}protected void swipeRight() {mKeyboardActionListener.swipeRight();}protected void swipeLeft() {mKeyboardActionListener.swipeLeft();}protected void swipeUp() {mKeyboardActionListener.swipeUp();}protected void swipeDown() {mKeyboardActionListener.swipeDown();}public void closing() {if (mPreviewPopup.isShowing()) {mPreviewPopup.dismiss();}removeMessages();dismissPopupKeyboard();mBuffer = null;mCanvas = null;mMiniKeyboardCache.clear();}private void removeMessages() {mHandler.removeMessages(MSG_REPEAT);mHandler.removeMessages(MSG_LONGPRESS);mHandler.removeMessages(MSG_SHOW_PREVIEW);}@Overridepublic void onDetachedFromWindow() {super.onDetachedFromWindow();closing();}private void dismissPopupKeyboard() {if (mPopupKeyboard.isShowing()) {mPopupKeyboard.dismiss();mMiniKeyboardOnScreen = false;invalidateAllKeys();}}public boolean handleBack() {if (mPopupKeyboard.isShowing()) {dismissPopupKeyboard();return true;}return false;}private void resetMultiTap() {mLastSentIndex = NOT_A_KEY;mTapCount = 0;mLastTapTime = -1;mInMultiTap = false;}private void checkMultiTap(long eventTime, int keyIndex) {if (keyIndex == NOT_A_KEY) return;Key key = mKeys[keyIndex];if (key.codes.length > 1) {mInMultiTap = true;if (eventTime < mLastTapTime + MULTITAP_INTERVAL&& keyIndex == mLastSentIndex) {mTapCount = (mTapCount + 1) % key.codes.length;return;} else {mTapCount = -1;return;}}if (eventTime > mLastTapTime + MULTITAP_INTERVAL || keyIndex != mLastSentIndex) {resetMultiTap();}}private static class SwipeTracker {static final int NUM_PAST = 4;static final int LONGEST_PAST_TIME = 200;final float mPastX[] = new float[NUM_PAST];final float mPastY[] = new float[NUM_PAST];final long mPastTime[] = new long[NUM_PAST];float mYVelocity;float mXVelocity;public void clear() {mPastTime[0] = 0;}public void addMovement(MotionEvent ev) {long time = ev.getEventTime();final int N = ev.getHistorySize();for (int i=0; i<N; i++) {addPoint(ev.getHistoricalX(i), ev.getHistoricalY(i),ev.getHistoricalEventTime(i));}addPoint(ev.getX(), ev.getY(), time);}private void addPoint(float x, float y, long time) {int drop = -1;int i;final long[] pastTime = mPastTime;for (i=0; i<NUM_PAST; i++) {if (pastTime[i] == 0) {break;} else if (pastTime[i] < time-LONGEST_PAST_TIME) {drop = i;}}if (i == NUM_PAST && drop < 0) {drop = 0;}if (drop == i) drop--;final float[] pastX = mPastX;final float[] pastY = mPastY;if (drop >= 0) {final int start = drop+1;final int count = NUM_PAST-drop-1;System.arraycopy(pastX, start, pastX, 0, count);System.arraycopy(pastY, start, pastY, 0, count);System.arraycopy(pastTime, start, pastTime, 0, count);i -= (drop+1);}pastX[i] = x;pastY[i] = y;pastTime[i] = time;i++;if (i < NUM_PAST) {pastTime[i] = 0;}}public void computeCurrentVelocity(int units) {computeCurrentVelocity(units, Float.MAX_VALUE);}public void computeCurrentVelocity(int units, float maxVelocity) {final float[] pastX = mPastX;final float[] pastY = mPastY;final long[] pastTime = mPastTime;final float oldestX = pastX[0];final float oldestY = pastY[0];final long oldestTime = pastTime[0];float accumX = 0;float accumY = 0;int N=0;while (N < NUM_PAST) {if (pastTime[N] == 0) {break;}N++;}for (int i=1; i < N; i++) {final int dur = (int)(pastTime[i] - oldestTime);if (dur == 0) continue;float dist = pastX[i] - oldestX;float vel = (dist/dur) * units;   // pixels/frame.if (accumX == 0) accumX = vel;else accumX = (accumX + vel) * .5f;dist = pastY[i] - oldestY;vel = (dist/dur) * units;   // pixels/frame.if (accumY == 0) accumY = vel;else accumY = (accumY + vel) * .5f;}mXVelocity = accumX < 0.0f ? Math.max(accumX, -maxVelocity): Math.min(accumX, maxVelocity);mYVelocity = accumY < 0.0f ? Math.max(accumY, -maxVelocity): Math.min(accumY, maxVelocity);}public float getXVelocity() {return mXVelocity;}public float getYVelocity() {return mYVelocity;}}
}

2,定义主布局activity_main.xml界面：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity" ><!--键盘是个  控件  我们需要时   填充布局进去  显示键盘 --><LinearLayout
        android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><EditText
            android:id="@+id/Etext_1"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="#00dfef"android:layout_margin="20dp"android:focusable="true"android:focusableInTouchMode="true"android:padding="10dp"android:hint="触摸弹出自定义xml键盘(构造方法1)"/><EditText
            android:id="@+id/Etext_2"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="20dp"android:padding="10dp"android:hint="触摸弹出自定义xml键盘2(构造方法2)"android:background="#00dfef"/></LinearLayout><!-- 是用xml自定义键盘样式   使用KeyboardView键盘控件存放定义的键盘布局 --><include
        layout="@layout/key_board_view"/>
</FrameLayout>

3,定义key_board_view布局其实是android.inputmethodserver.KeyboardView键盘控件。
不居中背景颜色和文本选择器不在赘述。读者根据需要自行添加。或者下载源码查看。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"><!-- 使用  android自带库中inputmethodserver包中 keyboardView 存放键盘布局 --><android.inputmethodservice.KeyboardView
        android:id="@+id/my_keyboard_view"android:layout_width="match_parent"android:layout_height="wrap_content"android:focusable="false"android:focusableInTouchMode="true"android:layout_alignParentBottom="true"android:background="@color/keyboardbackground"android:keyTextColor = "@color/keysTextColor"android:keyBackground="@drawable/keys_board_selector"android:visibility="gone"/>
</RelativeLayout>

4,xml文件定义键盘内容：
分为数字键盘和英文键盘，参考电脑键盘。其code值为ASCII码值。

定义数字numskeys.xml键盘：

<?xml version="1.0" encoding="utf-8"?>
<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"android:keyWidth="25%p" android:horizontalGap="0px"android:verticalGap="0px" android:keyHeight="45dip"><Row><Key android:codes="49" android:keyLabel="1" /><Key android:codes="50" android:keyLabel="2" /><Key android:codes="51" android:keyLabel="3" /><Key android:codes="57419" android:keyEdgeFlags="right"android:keyIcon="@mipmap/sym_keyboard_left" /></Row><Row><Key android:codes="52" android:keyLabel="4" /><Key android:codes="53" android:keyLabel="5" /><Key android:codes="54" android:keyLabel="6" /><Key android:codes="57421" android:keyEdgeFlags="right"android:keyIcon="@mipmap/sym_keyboard_right" /></Row><Row><Key android:codes="55" android:keyLabel="7" /><Key android:codes="56" android:keyLabel="8" /><Key android:codes="57" android:keyLabel="9" /><Key android:codes="-3" android:keyHeight="100dip"android:keyEdgeFlags="right" android:isRepeatable="true"android:keyLabel="done" /></Row><Row><Key android:codes="-2" android:keyLabel="ABC" /><Key android:codes="48" android:keyLabel="0" /><Key android:codes="-5" android:keyIcon="@mipmap/sym_keyboard_delete" /></Row>
</Keyboard>

定义英文wordskeys.xml键盘：

<?xml version="1.0" encoding="utf-8"?>
<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"android:keyWidth="10%p" android:keyHeight="45dip"android:horizontalGap="1px" android:verticalGap="1px"><Row><Key android:codes="113" android:keyEdgeFlags="left"android:keyLabel="q"/><Key android:codes="119" android:keyEdgeFlags="left"android:keyLabel="w"/><Key android:codes="101" android:keyEdgeFlags="left"android:keyLabel="e"/><Key android:codes="114" android:keyEdgeFlags="left"android:keyLabel="r"/><Key android:codes="116" android:keyEdgeFlags="left"android:keyLabel="t"/><Key android:codes="121" android:keyEdgeFlags="left"android:keyLabel="y"/><Key android:codes="117" android:keyEdgeFlags="left"android:keyLabel="u"/><Key android:codes="105" android:keyEdgeFlags="left"android:keyLabel="i"/><Key android:codes="111" android:keyEdgeFlags="left"android:keyLabel="o"/><Key android:codes="112" android:keyEdgeFlags="left"android:keyLabel="p"/></Row><Row><Key android:horizontalGap="4.999995%p" android:codes="97"android:keyEdgeFlags="left" android:keyLabel="a" /><Key android:codes="115" android:keyLabel="s" /><Key android:codes="100" android:keyLabel="d" /><Key android:codes="102" android:keyLabel="f" /><Key android:codes="103" android:keyLabel="g" /><Key android:codes="104" android:keyLabel="h" /><Key android:codes="106" android:keyLabel="j" /><Key android:codes="107" android:keyLabel="k" /><Key android:codes="108" android:keyEdgeFlags="right"android:keyLabel="l" /></Row><Row><Key android:keyWidth="14.999998%p" android:codes="-1"android:keyEdgeFlags="left" android:isModifier="true"android:isSticky="true" android:keyIcon="@mipmap/sym_keyboard_shift" /><Key android:codes="122" android:keyLabel="z" /><Key android:codes="120" android:keyLabel="x" /><Key android:codes="99" android:keyLabel="c" /><Key android:codes="118" android:keyLabel="v" /><Key android:codes="98" android:keyLabel="b" /><Key android:codes="110" android:keyLabel="n" /><Key android:codes="109" android:keyLabel="m" /><Key android:keyWidth="14.999998%p" android:codes="-5"android:keyEdgeFlags="right" android:isRepeatable="true"android:keyIcon="@mipmap/sym_keyboard_delete" /></Row><Row android:rowEdgeFlags="bottom"><Key android:keyWidth="25%p" android:codes="-2"android:keyLabel="12#" /><Key android:keyWidth="14%p" android:codes="44"android:keyLabel="," /><Key android:keyWidth="25%p" android:codes="32"android:isRepeatable="true" android:keyIcon="@mipmap/sym_keyboard_space" /><Key android:keyWidth="14%p" android:codes="46"android:keyLabel="." /><Key android:keyWidth="25%p" android:codes="-3"android:keyEdgeFlags="right" android:keyLabel="done" /></Row>
</Keyboard>

自定义键盘类XMLKeysUtils.java：

package zhaoq.com.myxmlkeyboard;import android.app.Activity;
import android.content.Context;
import android.inputmethodservice.Keyboard;
import android.inputmethodservice.KeyboardView;
import android.text.Editable;
import android.view.View;
import android.widget.EditText;import java.util.List;/*** PACKAGE_NAME:zhaoq.com.myxmlkeyboard* CREATE_BY:zhaoqiang* AUTHOR_EMAIL:zhaoq_hero@163.com* DATE: 2016/04/13  18:03* xml文件  定义的键盘*/
public class XMlKeysUtils implements KeyboardView.OnKeyboardActionListener {private EditText editText; //当前  需要添加内容的EditTextprivate Keyboard k1,k2;  //数字键盘 和字母键盘private KeyboardView keyboardView;//存放键盘的  布局//定义  构造方法一： 传入当前activitypublic XMlKeysUtils(Activity activity,EditText editText){this.editText = editText;//获取 数字键盘 和英文键盘：k1 = new Keyboard(activity.getApplicationContext(),R.xml.numskeys);k2 = new Keyboard(activity.getApplicationContext(),R.xml.wordskeys);keyboardView = (KeyboardView) activity.findViewById(R.id.my_keyboard_view);//填充布局:keyboardView.setKeyboard(k1);keyboardView.setEnabled(true);keyboardView.setPreviewEnabled(true);keyboardView.setOnKeyboardActionListener(this);  //添加监听事件键盘的}//定义  构造方法二： 传入当前activitypublic XMlKeysUtils(Context context,View view,EditText editText){this.editText = editText;//获取 数字键盘 和英文键盘：k1 = new Keyboard(context,R.xml.numskeys);k2 = new Keyboard(context,R.xml.wordskeys);keyboardView = (KeyboardView) view.findViewById(R.id.my_keyboard_view);//填充布局:keyboardView.setKeyboard(k1);keyboardView.setEnabled(true);keyboardView.setPreviewEnabled(true);keyboardView.setOnKeyboardActionListener(this);  //添加监听事件键盘的}//显示键盘public void showKeyBoard(){int visibility = keyboardView.getVisibility();if(visibility == View.GONE || visibility == View.INVISIBLE){keyboardView.setVisibility(View.VISIBLE);}}//隐藏键盘：public void hideKeyBoard(){int visibility = keyboardView.getVisibility();if(visibility == View.VISIBLE){keyboardView.setVisibility(View.GONE);}}private boolean isUpper = false;  //默认  为小写不是大写//大小写切换public void  changeKey(){List<Keyboard.Key> keyList = k2.getKeys(); //获取字母键盘   所有字母if(isUpper){ //是大写默认isUpper = false;for(Keyboard.Key key:keyList){if(key.label!=null && isword(key.label.toString())){key.label = key.label.toString().toLowerCase();//转换为小写key.codes[0] =  key.codes[0] + 32; //转换为小写}}}else{ //小写   转为大写isUpper = true;for(Keyboard.Key key:keyList){if(key.label !=null && isword(key.label.toString())){key.label = key.label.toString().toUpperCase();//转换为大写key.codes[0] = key.codes[0] - 32;//}}}}//判断  k2键盘中是否为英文：private boolean isword(String str){String wordstr = "abcdefghijklmnopqrstuvwxyz";if(wordstr.indexOf(str.toLowerCase())>-1){return  true;}return  false;}//------------------以下为键盘的监听事件--------------------@Overridepublic void onPress(int primaryCode) {//按下事件}@Overridepublic void onRelease(int primaryCode) {//释放事件}@Overridepublic void onText(CharSequence text) {}@Overridepublic void swipeLeft() {}@Overridepublic void swipeRight() {}@Overridepublic void swipeDown() {}@Overridepublic void swipeUp() {}@Overridepublic void onKey(int primaryCode, int[] keyCodes) {//添加监听事件：Editable edittable = editText.getText();//获取   当前EditText的可编辑对象int start = editText.getSelectionStart();//if(primaryCode == Keyboard.KEYCODE_CANCEL){//完成  按键hideKeyBoard();//隐藏键盘}else if (primaryCode == Keyboard.KEYCODE_DELETE){//回退if(edittable != null && edittable.length() > 0){if(start>0){edittable.delete(start - 1,start);}}}else if(primaryCode == Keyboard.KEYCODE_SHIFT){  //大小写  切换changeKey();//切换大小写keyboardView.setKeyboard(k2);//设置  为字母键盘}else if (primaryCode == Keyboard.KEYCODE_MODE_CHANGE){//数字和英文键盘切换if(isNum){//当前为   数字键盘isNum = false;keyboardView.setKeyboard(k2);// 设置为  字母键盘}else{isNum = true;keyboardView.setKeyboard(k1);//设置为数字键盘}}else if(primaryCode == 57419){  //go leftif (start > 0) {editText.setSelection(start - 1);}}else if(primaryCode == 57421){ //go rightif (start < editText.length()) {editText.setSelection(start + 1);}}else{edittable.insert(start,Character.toString((char)primaryCode));}}private boolean isNum = false;//是否是数字键盘}

MainActivity.java 主界面：

package zhaoq.com.myxmlkeyboard;import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.InputType;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.EditText;/*** android  自定义键盘* com.zhaoq.mykeyboard* @Email zhaoq_hero@163.com* @author zhaoQiang : 2016-4-13*/
public class MainActivity extends AppCompatActivity implements View.OnTouchListener {private EditText editText1,editText2;private View view;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);view = LayoutInflater.from(this).inflate(R.layout.activity_main,null);setContentView(view);editText1 = (EditText) findViewById(R.id.Etext_1);editText2 = (EditText) findViewById(R.id.Etext_2);//添加 触摸事件：editText2.setOnTouchListener(this);editText1.setOnTouchListener(this);}// 添加  触摸显示键盘的事件@Overridepublic boolean onTouch(View v, MotionEvent event) {if(event.getAction()==MotionEvent.ACTION_UP){editText1.setInputType(InputType.TYPE_NULL);editText2.setInputType(InputType.TYPE_NULL);switch (v.getId()){case R.id.Etext_1:new XMlKeysUtils(this,editText1).showKeyBoard();break;case R.id.Etext_2:new XMlKeysUtils(getApplicationContext(),view,editText2).showKeyBoard();break;default:break;}return true;}return false;}
}

这就完成了我们自定义键盘的开发。

源码链接：（基于AndroidStudio开发）
CSDN:http://download.csdn.net/detail/u013233097/9490892
Github:https://github.com/229457269/MyXmlKeyBoard

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