【Android】android系统多点触控源码

原文：http://www.linuxidc.com/Linux/2011-10/44305.htm

PointerLocation多点触控代码在Android系统源码中的位置分别为：

android\development\apps\Development\src\com\android\development\PointerLocation.java

android\frameworks\base\core\java\com\android\internal\widget\PointerLocationView.java

PointerLocation.java

package com.ckl.PointerLocation;import android.app.Activity;
import android.os.Bundle;
import android.view.WindowManager;/*** Demonstrates wrapping a layout in a ScrollView.**/
public class PointerLocation extends Activity {@Overrideprotected void onCreate(Bundle icicle) {super.onCreate(icicle);setContentView(new PointerLocationView(this));// Make the screen full bright for this activity.WindowManager.LayoutParams lp = getWindow().getAttributes();lp.screenBrightness = 1.0f;getWindow().setAttributes(lp);}
}

PointerLocationView .java

/** Copyright (C) 2010 The Android Open Source Project** 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 com.ckl.PointerLocation;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.FontMetricsInt;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;import java.util.ArrayList;public class PointerLocationView extends View {public static class PointerState {private final ArrayList<Float> mXs = new ArrayList<Float>();private final ArrayList<Float> mYs = new ArrayList<Float>();private boolean mCurDown;private int mCurX;private int mCurY;private float mCurPressure;private float mCurSize;private int mCurWidth;private VelocityTracker mVelocity;}private final ViewConfiguration mVC;private final Paint mTextPaint;private final Paint mTextBackgroundPaint;private final Paint mTextLevelPaint;private final Paint mPaint;private final Paint mTargetPaint;private final Paint mPathPaint;private final FontMetricsInt mTextMetrics = new FontMetricsInt();private int mHeaderBottom;private boolean mCurDown;private int mCurNumPointers;private int mMaxNumPointers;private final ArrayList<PointerState> mPointers= new ArrayList<PointerState>();private boolean mPrintCoords = true;public PointerLocationView(Context c) {super(c);setFocusable(true);mVC = ViewConfiguration.get(c);mTextPaint = new Paint();mTextPaint.setAntiAlias(true);mTextPaint.setTextSize(10* getResources().getDisplayMetrics().density);mTextPaint.setARGB(255, 0, 0, 0);mTextBackgroundPaint = new Paint();mTextBackgroundPaint.setAntiAlias(false);mTextBackgroundPaint.setARGB(128, 255, 255, 255);mTextLevelPaint = new Paint();mTextLevelPaint.setAntiAlias(false);mTextLevelPaint.setARGB(192, 255, 0, 0);mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setARGB(255, 255, 255, 255);mPaint.setStyle(Paint.Style.STROKE);mPaint.setStrokeWidth(2);mTargetPaint = new Paint();mTargetPaint.setAntiAlias(false);mTargetPaint.setARGB(255, 0, 0, 192);mPathPaint = new Paint();mPathPaint.setAntiAlias(false);mPathPaint.setARGB(255, 0, 96, 255);mPaint.setStyle(Paint.Style.STROKE);mPaint.setStrokeWidth(1);PointerState ps = new PointerState();ps.mVelocity = VelocityTracker.obtain();mPointers.add(ps);}public void setPrintCoords(boolean state) {mPrintCoords = state;}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);mTextPaint.getFontMetricsInt(mTextMetrics);mHeaderBottom = -mTextMetrics.ascent+mTextMetrics.descent+2;if (false) {Log.i("foo", "Metrics: ascent=" + mTextMetrics.ascent+ " descent=" + mTextMetrics.descent+ " leading=" + mTextMetrics.leading+ " top=" + mTextMetrics.top+ " bottom=" + mTextMetrics.bottom);}}@Overrideprotected void onDraw(Canvas canvas) {synchronized (mPointers) {final int w = getWidth();final int itemW = w/7;final int base = -mTextMetrics.ascent+1;final int bottom = mHeaderBottom;final int NP = mPointers.size();if (NP > 0) {final PointerState ps = mPointers.get(0);canvas.drawRect(0, 0, itemW-1, bottom,mTextBackgroundPaint);canvas.drawText("P: " + mCurNumPointers + " / " + mMaxNumPointers,1, base, mTextPaint);final int N = ps.mXs.size();if ((mCurDown && ps.mCurDown) || N == 0) {canvas.drawRect(itemW, 0, (itemW * 2) - 1, bottom, mTextBackgroundPaint);canvas.drawText("X: " + ps.mCurX, 1 + itemW, base, mTextPaint);canvas.drawRect(itemW * 2, 0, (itemW * 3) - 1, bottom, mTextBackgroundPaint);canvas.drawText("Y: " + ps.mCurY, 1 + itemW * 2, base, mTextPaint);} else {float dx = ps.mXs.get(N-1) - ps.mXs.get(0);float dy = ps.mYs.get(N-1) - ps.mYs.get(0);canvas.drawRect(itemW, 0, (itemW * 2) - 1, bottom,Math.abs(dx) < mVC.getScaledTouchSlop()? mTextBackgroundPaint : mTextLevelPaint);canvas.drawText("dX: " + String.format("%.1f", dx), 1 + itemW, base, mTextPaint);canvas.drawRect(itemW * 2, 0, (itemW * 3) - 1, bottom,Math.abs(dy) < mVC.getScaledTouchSlop()? mTextBackgroundPaint : mTextLevelPaint);canvas.drawText("dY: " + String.format("%.1f", dy), 1 + itemW * 2, base, mTextPaint);}canvas.drawRect(itemW * 3, 0, (itemW * 4) - 1, bottom, mTextBackgroundPaint);int velocity = ps.mVelocity == null ? 0 : (int) (ps.mVelocity.getXVelocity() * 1000);canvas.drawText("Xv: " + velocity, 1 + itemW * 3, base, mTextPaint);canvas.drawRect(itemW * 4, 0, (itemW * 5) - 1, bottom, mTextBackgroundPaint);velocity = ps.mVelocity == null ? 0 : (int) (ps.mVelocity.getYVelocity() * 1000);canvas.drawText("Yv: " + velocity, 1 + itemW * 4, base, mTextPaint);canvas.drawRect(itemW * 5, 0, (itemW * 6) - 1, bottom, mTextBackgroundPaint);canvas.drawRect(itemW * 5, 0, (itemW * 5) + (ps.mCurPressure * itemW) - 1,bottom, mTextLevelPaint);canvas.drawText("Prs: " + String.format("%.2f", ps.mCurPressure), 1 + itemW * 5,base, mTextPaint);canvas.drawRect(itemW * 6, 0, w, bottom, mTextBackgroundPaint);canvas.drawRect(itemW * 6, 0, (itemW * 6) + (ps.mCurSize * itemW) - 1,bottom, mTextLevelPaint);canvas.drawText("Size: " + String.format("%.2f", ps.mCurSize), 1 + itemW * 6,base, mTextPaint);}for (int p=0; p<NP; p++) {final PointerState ps = mPointers.get(p);if (mCurDown && ps.mCurDown) {canvas.drawLine(0, (int)ps.mCurY, getWidth(), (int)ps.mCurY, mTargetPaint);canvas.drawLine((int)ps.mCurX, 0, (int)ps.mCurX, getHeight(), mTargetPaint);int pressureLevel = (int)(ps.mCurPressure*255);mPaint.setARGB(255, pressureLevel, 128, 255-pressureLevel);canvas.drawPoint(ps.mCurX, ps.mCurY, mPaint);canvas.drawCircle(ps.mCurX, ps.mCurY, ps.mCurWidth, mPaint);}}for (int p=0; p<NP; p++) {final PointerState ps = mPointers.get(p);final int N = ps.mXs.size();float lastX=0, lastY=0;boolean haveLast = false;boolean drawn = false;mPaint.setARGB(255, 128, 255, 255);for (int i=0; i<N; i++) {float x = ps.mXs.get(i);float y = ps.mYs.get(i);if (Float.isNaN(x)) {haveLast = false;continue;}if (haveLast) {canvas.drawLine(lastX, lastY, x, y, mPathPaint);canvas.drawPoint(lastX, lastY, mPaint);drawn = true;}lastX = x;lastY = y;haveLast = true;}if (drawn) {if (ps.mVelocity != null) {mPaint.setARGB(255, 255, 64, 128);float xVel = ps.mVelocity.getXVelocity() * (1000/60);float yVel = ps.mVelocity.getYVelocity() * (1000/60);canvas.drawLine(lastX, lastY, lastX+xVel, lastY+yVel, mPaint);} else {canvas.drawPoint(lastX, lastY, mPaint);}}}}}public void addTouchEvent(MotionEvent event) {synchronized (mPointers) {int action = event.getAction();//Log.i("Pointer", "Motion: action=0x" + Integer.toHexString(action)//        + " pointers=" + event.getPointerCount());int NP = mPointers.size();//mRect.set(0, 0, getWidth(), mHeaderBottom+1);//invalidate(mRect);//if (mCurDown) {//    mRect.set(mCurX-mCurWidth-3, mCurY-mCurWidth-3,//            mCurX+mCurWidth+3, mCurY+mCurWidth+3);//} else {//    mRect.setEmpty();//}if (action == MotionEvent.ACTION_DOWN) {for (int p=0; p<NP; p++) {final PointerState ps = mPointers.get(p);ps.mXs.clear();ps.mYs.clear();ps.mVelocity = VelocityTracker.obtain();ps.mCurDown = false;}mPointers.get(0).mCurDown = true;mMaxNumPointers = 0;if (mPrintCoords) {Log.i("Pointer", "Pointer 1: DOWN");}}if ((action&MotionEvent.ACTION_MASK) == MotionEvent.ACTION_POINTER_DOWN) {final int index = (action&MotionEvent.ACTION_POINTER_INDEX_MASK)>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;final int id = event.getPointerId(index);while (NP <= id) {PointerState ps = new PointerState();ps.mVelocity = VelocityTracker.obtain();mPointers.add(ps);NP++;}final PointerState ps = mPointers.get(id);ps.mVelocity = VelocityTracker.obtain();ps.mCurDown = true;if (mPrintCoords) {Log.i("Pointer", "Pointer " + (id+1) + ": DOWN");}}final int NI = event.getPointerCount();mCurDown = action != MotionEvent.ACTION_UP&& action != MotionEvent.ACTION_CANCEL;mCurNumPointers = mCurDown ? NI : 0;if (mMaxNumPointers < mCurNumPointers) {mMaxNumPointers = mCurNumPointers;}for (int i=0; i<NI; i++) {final int id = event.getPointerId(i);final PointerState ps = mPointers.get(id);ps.mVelocity.addMovement(event);ps.mVelocity.computeCurrentVelocity(1);final int N = event.getHistorySize();for (int j=0; j<N; j++) {if (mPrintCoords) {Log.i("Pointer", "Pointer " + (id+1) + ": ("+ event.getHistoricalX(i, j)+ ", " + event.getHistoricalY(i, j) + ")"+ " Prs=" + event.getHistoricalPressure(i, j)+ " Size=" + event.getHistoricalSize(i, j));}ps.mXs.add(event.getHistoricalX(i, j));ps.mYs.add(event.getHistoricalY(i, j));}if (mPrintCoords) {Log.i("Pointer", "Pointer " + (id+1) + ": ("+ event.getX(i) + ", " + event.getY(i) + ")"+ " Prs=" + event.getPressure(i)+ " Size=" + event.getSize(i));}ps.mXs.add(event.getX(i));ps.mYs.add(event.getY(i));ps.mCurX = (int)event.getX(i);ps.mCurY = (int)event.getY(i);//Log.i("Pointer", "Pointer #" + p + ": (" + ps.mCurX//        + "," + ps.mCurY + ")");ps.mCurPressure = event.getPressure(i);ps.mCurSize = event.getSize(i);ps.mCurWidth = (int)(ps.mCurSize*(getWidth()/3));}if ((action&MotionEvent.ACTION_MASK) == MotionEvent.ACTION_POINTER_UP) {final int index = (action&MotionEvent.ACTION_POINTER_INDEX_MASK)>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;final int id = event.getPointerId(index);final PointerState ps = mPointers.get(id);ps.mXs.add(Float.NaN);ps.mYs.add(Float.NaN);ps.mCurDown = false;if (mPrintCoords) {Log.i("Pointer", "Pointer " + (id+1) + ": UP");}}if (action == MotionEvent.ACTION_UP) {for (int i=0; i<NI; i++) {final int id = event.getPointerId(i);final PointerState ps = mPointers.get(id);if (ps.mCurDown) {ps.mCurDown = false;if (mPrintCoords) {Log.i("Pointer", "Pointer " + (id+1) + ": UP");}}}}//if (mCurDown) {//    mRect.union(mCurX-mCurWidth-3, mCurY-mCurWidth-3,//            mCurX+mCurWidth+3, mCurY+mCurWidth+3);//}//invalidate(mRect);postInvalidate();}}@Overridepublic boolean onTouchEvent(MotionEvent event) {addTouchEvent(event);return true;}@Overridepublic boolean onTrackballEvent(MotionEvent event) {Log.i("Pointer", "Trackball: " + event);return super.onTrackballEvent(event);}}

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