一些标准的处理代码

 

 

1 调节bitmap大小以覆盖指定大小区域

 

 

    static Bitmap generateBitmap(Context context, Bitmap bm, int width, int height) {
        if (bm == null) {
            return bm;
        }
        bm.setDensity(DisplayMetrics.DENSITY_DEVICE);
        
        // This is the final bitmap we want to return.
        // XXX We should get the pixel depth from the system (to match the
        // physical display depth), when there is a way.
        Bitmap newbm = Bitmap.createBitmap(width, height,
                Bitmap.Config.RGB_565);
        newbm.setDensity(DisplayMetrics.DENSITY_DEVICE);
        Canvas c = new Canvas(newbm);
        c.setDensity(DisplayMetrics.DENSITY_DEVICE);
        Rect targetRect = new Rect();
        targetRect.left = targetRect.top = 0;
        targetRect.right = bm.getWidth();
        targetRect.bottom = bm.getHeight();
        
        int deltaw = width - targetRect.right;
        int deltah = height - targetRect.bottom;
        
        if (deltaw > 0 || deltah > 0) {
            // We need to scale up so it covers the entire
            // area.
            float scale = 1.0f;
            if (deltaw > deltah) {
                scale = width / (float)targetRect.right;
            } else {
                scale = height / (float)targetRect.bottom;
            }
            targetRect.right = (int)(targetRect.right*scale);
            targetRect.bottom = (int)(targetRect.bottom*scale);
            deltaw = width - targetRect.right;
            deltah = height - targetRect.bottom;
        }
        
        targetRect.offset(deltaw/2, deltah/2);
        Paint paint = new Paint();
        paint.setFilterBitmap(true);
        paint.setDither(true);
        c.drawBitmap(bm, null, targetRect, paint);
        
        bm.recycle();
        return newbm;
    }

 

 

 

2 把wallpaper设置为大于屏幕宽度（如需要划屏）

 

 

    private void setWallpaperDimension() {
        WallpaperManager wpm = (WallpaperManager)getSystemService(WALLPAPER_SERVICE);

        Display display = getWindowManager().getDefaultDisplay();
        boolean isPortrait = display.getWidth() < display.getHeight();

        final int width = isPortrait ? display.getWidth() : display.getHeight();
        final int height = isPortrait ? display.getHeight() : display.getWidth();
        wpm.suggestDesiredDimensions(width * WALLPAPER_SCREENS_SPAN, height);
    }

 

 

3 屏蔽home键

 

 

    public boolean onKeyDown(int keyCode, KeyEvent event)  {  
      // TODO Auto-generated method stub  
      if(KeyEvent.KEYCODE_HOME==keyCode)  
        Log.i("lds", "HOme") ;
      return super.onKeyDown(keyCode, event);  
    }  
     
    @Override  
    public void onAttachedToWindow() {  
      // TODO Auto-generated method stub  
      this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);     
      super.onAttachedToWindow();  
    } 

 

 

添加权限：

<uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission>