android 获得系统的所有应用

package com.xinwu.app; import java.util.Collections; import java.util.List; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.content.pm.ResolveInfo; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.PixelFormat; import android.graphics.drawable.Drawable; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import android.view.GestureDetector.OnGestureListener; import android.view.View.OnTouchListener; public class MyView extends View implements OnGestureListener,OnTouchListener{ private Context context; private PackageManager mPackageManager; private List<ResolveInfo> mAllApps; private Paint paint; private Bitmap bitmap; private int size = 15; private GestureDetector detector; private boolean isEnd; public MyView(Context context) { super(context); this.context = context; paint = new Paint(); this.setOnTouchListener(this); //必须加入长接触监听 this.setLongClickable(true); detector = new GestureDetector(context, this); bitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher); //this.bindAllApps(); } float y = 10; @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.WHITE); paint.setColor(Color.RED); if(!isEnd){ for(int i = 0;i<size ;i++){ float drawY = y+bitmap.getHeight()*i; canvas.drawBitmap(bitmap, 10, drawY, paint); canvas.drawText("text"+i, bitmap.getWidth()+20, drawY+40, paint); if(drawY<480&&i==size-1){ System.out.println("===================="+drawY); isEnd = true; } } }else{ for(int i = 0;i<size ;i++){ float drawY = y*(i+1)/10+bitmap.getHeight()*i; canvas.drawBitmap(bitmap, 10, y*(i+1)/10+bitmap.getHeight()*i, paint); canvas.drawText("text"+i, bitmap.getWidth()+20, drawY+40, paint); if(drawY>480&&i==size-1){ System.out.println("===================="+drawY); isEnd = false; } } } super.onDraw(canvas); } @Override public boolean onTouch(View v, MotionEvent event) { if(event.getAction() == MotionEvent.ACTION_UP){ // y = 10; if(isEnd){ y = 10; } this.invalidate(); } return detector.onTouchEvent(event); } @Override public boolean onDown(MotionEvent e) { // TODO Auto-generated method stub return false; } @Override public void onShowPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onSingleTapUp(MotionEvent e) { // TODO Auto-generated method stub return false; } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { if(e2.getY()>e1.getY()){ y += (e2.getY() - e1.getY())/50; this.invalidate(); System.out.println("--------------------"); }else if(e2.getY()<e1.getY()){ y += (e2.getY() - e1.getY())/50; System.out.println("+++++++++++++++++++++"); this.invalidate(); } return false; } @Override public void onLongPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { // TODO Auto-generated method stub return false; } private void onDrawItem(Canvas canvas){ ResolveInfo res = mAllApps.get(0); Drawable drawable = res.loadIcon(mPackageManager); // 取 drawable 的长宽 int w = drawable.getIntrinsicWidth(); int h = drawable.getIntrinsicHeight(); // 取 drawable 的颜色格式 Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; // 建立对应 bitmap Bitmap bitmap = Bitmap.createBitmap(w, h, config); canvas.drawBitmap(bitmap, 10, 10, paint); canvas.drawText(res.loadLabel(mPackageManager).toString(), 10f, 100f, paint); System.out.println("---"+res.loadLabel(mPackageManager).toString()); } private void bindAllApps(){ mPackageManager = context.getPackageManager(); Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); mAllApps = mPackageManager.queryIntentActivities(mainIntent, 0); Collections.sort(mAllApps, new ResolveInfo.DisplayNameComparator(mPackageManager)); } }