现在很多第三方Launcher((如360Launcher,GoLauncher)带有iphone主题，相信玩Android的人大都知道。

本例实现仿iphone主题的launcher的冰山一角。如下图：

从效果看，大概就能猜出用什么控件类(支持左右滑动的控件类+GridView)，支持左右滑动的控件类，有很多了比如常用的Gallery,ViewPager,ViewFlipper,ViewFlow等等，本例自定义继承ViewGroup的。看过launcher源码的人应该都知道 有个Workspace类继承ViewGroup实现主菜单的。

闲话不多说了！

主布局:main.xml

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

android:id="@+id/workspace"

android:layout_width="fill_parent"

android:layout_height="fill_parent" />

android:id="@+id/indicator"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentBottom="true"

android:layout_centerHorizontal="true"

android:layout_marginBottom="20dip" />

第一个自定义类Workspace就是实现左右滑动的，第二个类PageIndicator做指示器用。

Workspace.java

package com.xyz.workspace;

import java.util.List;

import android.content.Context;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.VelocityTracker;

import android.view.View;

import android.view.ViewConfiguration;

import android.view.ViewGroup;

import android.widget.Scroller;

public class Workspace extends ViewGroup {

private static final String TAG = "Workspace";

private Scroller mScroller;

private VelocityTracker mVelocityTracker;

private static final int DEFAULT_SCREEN = 0;

private static final int TOUCH_STATE_REST = 0;

private static final int TOUCH_STATE_SCROLLING = 1;

private static final int SNAP_VELOCITY = 600;

public static final int APP_PAGE_SIZE = 16;

private int mCurScreen;

private int mTouchState = TOUCH_STATE_REST;

private int mTouchSlop;

private float mLastMotionX;

private float mLastMotionY;

private OnViewChangedListener mOnViewChangedListener;

public Workspace(Context context, AttributeSet attrs) {

this(context, attrs, 0);

// TODO Auto-generated constructor stub

}

public Workspace(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

// TODO Auto-generated constructor stub

mScroller = new Scroller(context);

mCurScreen = DEFAULT_SCREEN;

mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();

}

@Override

protected void onLayout(boolean changed, int l, int t, int r, int b) {

// TODO Auto-generated method stub

if (changed) {

int childLeft = 0;

final int childCount = getChildCount();

for (int i = 0; i < childCount; i++) {

final View childView = getChildAt(i);

if (childView.getVisibility() != View.GONE) {

final int childWidth = childView.getMeasuredWidth();

childView.layout(childLeft, 0, childLeft + childWidth,

childView.getMeasuredHeight());

childLeft += childWidth;

}

}

}

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

final int width = MeasureSpec.getSize(widthMeasureSpec);

final int widthMode = MeasureSpec.getMode(widthMeasureSpec);

if (widthMode != MeasureSpec.EXACTLY) {

throw new IllegalStateException(

"ScrollLayout only canmCurScreen run at EXACTLY mode!");

}

final int heightMode = MeasureSpec.getMode(heightMeasureSpec);

if (heightMode != MeasureSpec.EXACTLY) {

throw new IllegalStateException(

"ScrollLayout only can run at EXACTLY mode!");

}

final int count = getChildCount();

for (int i = 0; i < count; i++) {

getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);

}

scrollTo(mCurScreen * width, 0);

}

public void snapToDestination() {

final int screenWidth = getWidth();

final int destScreen = (getScrollX() + screenWidth / 2) / screenWidth;

snapToScreen(destScreen);

}

public void snapToScreen(int whichScreen) {

whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));

if (getScrollX() != (whichScreen * getWidth())) {

final int delta = whichScreen * getWidth() - getScrollX();

mScroller.startScroll(getScrollX(), 0, delta, 0,

Math.abs(delta) * 2);

mCurScreen = whichScreen;

invalidate();

}

if (mOnViewChangedListener != null) {

mOnViewChangedListener.onChange(getChildCount(), whichScreen);

}

}

public void setToScreen(int whichScreen) {

whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));

mCurScreen = whichScreen;

scrollTo(whichScreen * getWidth(), 0);

}

public int getCurScreen() {

return mCurScreen;

}

@Override

public void computeScroll() {

// TODO Auto-generated method stub

if (mScroller.computeScrollOffset()) {

scrollTo(mScroller.getCurrX(), mScroller.getCurrY());

postInvalidate();

}

}

@Override

public boolean onTouchEvent(MotionEvent event) {

// TODO Auto-generated method stub

if (mVelocityTracker == null) {

mVelocityTracker = VelocityTracker.obtain();

}

mVelocityTracker.addMovement(event);

final int action = event.getAction();

final float x = event.getX();

final float y = event.getY();

switch (action) {

case MotionEvent.ACTION_DOWN:

if (!mScroller.isFinished()) {

mScroller.abortAnimation();

}

mLastMotionX = x;

break;

case MotionEvent.ACTION_MOVE:

int deltaX = (int) (mLastMotionX - x);

mLastMotionX = x;

scrollBy(deltaX, 0);

break;

case MotionEvent.ACTION_UP:

final VelocityTracker velocityTracker = mVelocityTracker;

velocityTracker.computeCurrentVelocity(1000);

int velocityX = (int) velocityTracker.getXVelocity();

if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {

snapToScreen(mCurScreen - 1);

} else if (velocityX < -SNAP_VELOCITY

&& mCurScreen < getChildCount() - 1) {

snapToScreen(mCurScreen + 1);

} else {

snapToDestination();

}

if (mVelocityTracker != null) {

mVelocityTracker.recycle();

mVelocityTracker = null;

}

mTouchState = TOUCH_STATE_REST;

break;

case MotionEvent.ACTION_CANCEL:

mTouchState = TOUCH_STATE_REST;

break;

}

return true;

}

@Override

public boolean onInterceptTouchEvent(MotionEvent ev) {

// TODO Auto-generated method stub

final int action = ev.getAction();

if ((action == MotionEvent.ACTION_MOVE)

&& (mTouchState != TOUCH_STATE_REST)) {

return true;

}

final float x = ev.getX();

final float y = ev.getY();

switch (action) {

case MotionEvent.ACTION_MOVE:

final int xDiff = (int) Math.abs(mLastMotionX - x);

if (xDiff > mTouchSlop) {

mTouchState = TOUCH_STATE_SCROLLING;

}

break;

case MotionEvent.ACTION_DOWN:

mLastMotionX = x;

mLastMotionY = y;

mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST

: TOUCH_STATE_SCROLLING;

break;

case MotionEvent.ACTION_CANCEL:

case MotionEvent.ACTION_UP:

mTouchState = TOUCH_STATE_REST;

break;

}

return mTouchState != TOUCH_STATE_REST;

}

public void setOnViewChangedListener(OnViewChangedListener l) {

mOnViewChangedListener = l;

}

public interface OnViewChangedListener {

public void onChange(int cnt, int index);

}

}

PageIndicator.java:

package com.xyz.workspace;

import android.content.Context;

import android.util.AttributeSet;

import android.view.View;

import android.widget.ImageView;

import android.widget.LinearLayout;

public class PageIndicator extends LinearLayout {

private Context mContext;

public PageIndicator(Context ctx) {

super(ctx);

// TODO Auto-generated constructor stub

mContext = ctx;

}

public PageIndicator(Context ctx, AttributeSet attrs) {

super(ctx, attrs);

// TODO Auto-generated constructor stub

mContext = ctx;

}

public void setIndication(int cnt, int index) {

if (index < 0 || index > cnt)

index = 0;

removeAllViews();

for (int i = 0; i < cnt; i++) {

ImageView iv = new ImageView(mContext);

iv.setImageResource(index == i ? R.drawable.indicator_current

: R.drawable.indicator);

if (i != 0 || i != cnt - 1) {

iv.setPadding(4, 0, 4, 0);

}

addView(iv);

}

}

}

这两个类的作用上面已经说了，有什么看不明白的欢迎提问，或自行google。

ViewGroup实现好了，剩下就是实现GridView显示系统所有app，主要工作也就是实现GridView的适配器---GridAdapter

package com.xyz.workspace;

import java.util.List;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.pm.ResolveInfo;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import static com.xyz.workspace.Workspace.APP_PAGE_SIZE;

public class GridAdapter extends BaseAdapter implements OnClickListener {

private Context mContext;

private int mPageIndex;

private List mPackagesInfo;

public GridAdapter(Context context, List listInfo, int page) {

mContext = context;

mPackagesInfo = listInfo;

mPageIndex = page;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

int size = mPackagesInfo.size();

return size / APP_PAGE_SIZE > 0

&& size - (APP_PAGE_SIZE * (mPageIndex + 1)) > 0 ? APP_PAGE_SIZE

: size % APP_PAGE_SIZE;

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

return mPackagesInfo.get(APP_PAGE_SIZE * mPageIndex + position);

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

// TODO Auto-generated method stub

if (convertView == null) {

convertView = new AppItem(mContext, (ResolveInfo) getItem(position));

}

convertView.setOnClickListener(this);

convertView.setTag(Integer.valueOf(position));

return convertView;

}

/** 点击启动app **/

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

int pos = (Integer) v.getTag();

ResolveInfo info = (ResolveInfo) getItem(pos);

Intent i = new Intent(Intent.ACTION_MAIN);

i.addCategory(Intent.CATEGORY_LAUNCHER);

i.setComponent(new ComponentName(info.activityInfo.packageName,

info.activityInfo.name));

mContext.startActivity(i);

}

}

GridView的每个item不用说，一看就知道是一个LinearLayout上面是个ImageView，下面一个TextView了。我把它封装了下---AppItem:

package com.xyz.workspace;

import android.content.Context;

import android.content.pm.PackageManager;

import android.content.pm.ResolveInfo;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.PixelFormat;

import android.graphics.PorterDuffXfermode;

import android.graphics.Rect;

import android.graphics.RectF;

import android.graphics.Bitmap.Config;

import android.graphics.PorterDuff.Mode;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.util.AttributeSet;

import android.view.LayoutInflater;

import android.widget.ImageView;

import android.widget.RelativeLayout;

import android.widget.TextView;

public class AppItem extends RelativeLayout {

private Context mContext;

private ImageView mAppIcon;

private TextView mAppName;

private ResolveInfo mAppInfo;

private PackageManager mPackageManager;

public AppItem(Context context) {

super(context);

mContext = context;

mPackageManager = context.getPackageManager();

LayoutInflater.from(context).inflate(R.layout.app_item, this);

mAppIcon = (ImageView) findViewById(R.id.icon);

mAppName = (TextView) findViewById(R.id.app_name);

}

public AppItem(Context context, ResolveInfo info) {

this(context);

mAppInfo = info;

show();

}

private void show() {

String packageName = mAppInfo.activityInfo.packageName;

String appName = mAppInfo.activityInfo.loadLabel(mPackageManager)

.toString();

if (appName.equals("拨号")) {

mAppIcon.setImageResource(R.drawable.com_android_phone);

} else if (packageName.equals("com.android.contacts")) {

mAppIcon.setImageResource(R.drawable.com_android_contacts);

} else if (packageName.equals("com.android.mms")) {

mAppIcon.setImageResource(R.drawable.com_android_mms);

} else if (packageName.equals("com.android.music")) {

mAppIcon.setImageResource(R.drawable.com_android_music);

} else if (packageName.equals("com.android.browser")) {

mAppIcon.setImageResource(R.drawable.com_android_browser);

} else if (packageName.equals("com.android.settings")) {

mAppIcon.setImageResource(R.drawable.com_android_settings);

} else if (packageName.equals("com.android.email")) {

mAppIcon.setImageResource(R.drawable.com_android_email);

} else if (packageName.equals("com.android.calendar")) {

mAppIcon.setImageResource(R.drawable.com_android_calendar);

} else if (packageName.equals("com.android.calculator2")) {

mAppIcon.setImageResource(R.drawable.com_android_calculator2);

} else if (packageName.equals("com.android.deskclock")) {

mAppIcon.setImageResource(R.drawable.com_android_deskclock);

} else if (packageName.equals("com.android.camera")) {

mAppIcon.setImageResource(R.drawable.com_android_camera);

} else if (packageName.equals("com.android.soundrecorder")) {

mAppIcon.setImageResource(R.drawable.com_android_soundrecorder);

} else if (packageName.equals("com.tencent.mobileqq")) {

mAppIcon.setImageResource(R.drawable.com_tencent_qq);

} else if (packageName.equals("com.tencent.mm")) {

mAppIcon.setImageResource(R.drawable.com_tencent_mm);

} else if (packageName.equals("com.tencent.mtt")) {

mAppIcon.setImageResource(R.drawable.com_tencent_mtt);

} else if (packageName.equals("com.sina.weibo")) {

mAppIcon.setImageResource(R.drawable.com_sina_weibo);

} else if (packageName.equals("com.sds.android.ttpod")) {

mAppIcon.setImageResource(R.drawable.com_sds_android_ttpod);

//

} else if (packageName.equals("com.youdao.dict")) {

mAppIcon.setImageResource(R.drawable.com_youdao_dict);

} else {

mAppIcon.setImageDrawable(getRoundCornerDrawable(mContext,

mAppInfo.activityInfo.loadIcon(mPackageManager), 20));

}

mAppName.setText(appName);

}

private Drawable getRoundCornerDrawable(Context ctx, int resId,

float roundPX /* 圆角半径 */) {

return getRoundCornerDrawable(ctx,

mContext.getResources().getDrawable(resId), roundPX);

}

private Drawable getRoundCornerDrawable(Context ctx, Drawable drawable,

float roundPX /* 圆角半径 */) {

int w = ctx.getResources()

.getDimensionPixelSize(R.dimen.app_icon_width);

int h = w;

Bitmap bitmap = Bitmap

.createBitmap(

w,

h,

drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

: Bitmap.Config.RGB_565);

Canvas canvas = new Canvas(bitmap);

drawable.setBounds(0, 0, w, h);

drawable.draw(canvas);

int width = bitmap.getWidth();

int height = bitmap.getHeight();

Bitmap retBmp = Bitmap.createBitmap(width, height, Config.ARGB_8888);

Canvas can = new Canvas(retBmp);

final int color = 0xff424242;

final Paint paint = new Paint();

final Rect rect = new Rect(0, 0, width, height);

final RectF rectF = new RectF(rect);

paint.setColor(color);

paint.setAntiAlias(true);

can.drawARGB(0, 0, 0, 0);

can.drawRoundRect(rectF, roundPX, roundPX, paint);

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

can.drawBitmap(bitmap, rect, rect, paint);

return new BitmapDrawable(retBmp);

}

}

注意咯，show函数就是替换显示对应iphone里app的图标(来源反编译iphone主题的launcher或锁屏)，利用 包名 判断是哪个应用再换上对应图标，例如com.android.mms---信息，com.android.contacts---联系人，这里有个疑问，为什么phone模块的package_name的也是com.android.contacts，有人知道么？谢谢啦！

AppItem引用一个布局：

app_item.xml:

android:layout_width="@dimen/app_icon_width"

android:layout_height="@dimen/app_icon_height"

android:gravity="center"

android:orientation="vertical" >

android:id="@+id/icon"

android:layout_width="@dimen/app_icon_width"

android:layout_height="@dimen/app_icon_width"

android:layout_gravity="center_horizontal" />

android:id="@+id/app_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"

android:ellipsize="marquee"

android:maxWidth="@dimen/app_icon_height"

android:singleLine="true"

android:textColor="@android:color/white"

android:textSize="12sp" />

主Activity就是获取所有app信息及初始化界面，

MainActivty.java:

package com.xyz.workspace;

import java.util.List;

import com.xyz.workspace.Workspace.OnViewChangedListener;

import android.app.Activity;

import android.content.Intent;

import android.content.pm.ResolveInfo;

import android.os.Bundle;

import android.view.Gravity;

import android.widget.GridView;

import static com.xyz.workspace.Workspace.APP_PAGE_SIZE;

public class MainActivity extends Activity implements OnViewChangedListener {

private Workspace mWorkspace;

private PageIndicator mIndicator;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mWorkspace = (Workspace) findViewById(R.id.workspace);

mIndicator = (PageIndicator) findViewById(R.id.indicator);

List apps = loadApps();

for (int i = 0; i < Math.ceil(1.0f * apps.size() / APP_PAGE_SIZE); i++) {

GridView grid = new GridView(this);

grid.setNumColumns(4);

grid.setHorizontalSpacing(10);

grid.setVerticalSpacing(40);

grid.setPadding(30, 50, 30, 20);

grid.setGravity(Gravity.CENTER);

grid.setAdapter(new GridAdapter(this, apps, i));

mWorkspace.addView(grid);

}

mWorkspace.setOnViewChangedListener(this);

mIndicator.setIndication(mWorkspace.getChildCount(), 0);

}

private List loadApps() {

Intent i = new Intent(Intent.ACTION_MAIN, null);

i.addCategory(Intent.CATEGORY_LAUNCHER);

return getPackageManager().queryIntentActivities(i, 0);

}

@Override

public void onChange(int cnt, int index) {

// TODO Auto-generated method stub

mIndicator.setIndication(cnt, index);

}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。