该View转换成Bitmap方法

方法一：

/**
	* 该View绘制到Bitmap上
	* @param view 须要绘制的View
	* @param width 该View的宽度
	* @param height 该View的高度
	* @return 返回Bitmap对象
	* add by csj 13-11-6
	*/
	public Bitmap getViewBitmap(View comBitmap, int width, int height) {
		Bitmap bitmap = null;
		if (comBitmap != null) {
			comBitmap.clearFocus();
			comBitmap.setPressed(false);

			boolean willNotCache = comBitmap.willNotCacheDrawing();
			comBitmap.setWillNotCacheDrawing(false);

			// Reset the drawing cache background color to fully transparent
			// for the duration of this operation
			int color = comBitmap.getDrawingCacheBackgroundColor();
			comBitmap.setDrawingCacheBackgroundColor(0);
			float alpha = comBitmap.getAlpha();
			comBitmap.setAlpha(1.0f);

			if (color != 0) {
				comBitmap.destroyDrawingCache();
			}
			
			int widthSpec = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
			int heightSpec = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
			comBitmap.measure(widthSpec, heightSpec);
			comBitmap.layout(0, 0, width, height);

			comBitmap.buildDrawingCache();
			Bitmap cacheBitmap = comBitmap.getDrawingCache();
			if (cacheBitmap == null) {
				Log.e("view.ProcessImageToBlur", "failed getViewBitmap(" + comBitmap + ")", 
						new RuntimeException());
				return null;
			}
			bitmap = Bitmap.createBitmap(cacheBitmap);
			// Restore the view
			comBitmap.setAlpha(alpha);
			comBitmap.destroyDrawingCache();
			comBitmap.setWillNotCacheDrawing(willNotCache);
			comBitmap.setDrawingCacheBackgroundColor(color);
		}
		return bitmap;
	}

方法二：

private Bitmap getViewBitmap(View v) {  
        v.clearFocus();  
        v.setPressed(false);  
  
        boolean willNotCache = v.willNotCacheDrawing();  
        v.setWillNotCacheDrawing(false);  
  
        // Reset the drawing cache background color to fully transparent  
        // for the duration of this operation  
        int color = v.getDrawingCacheBackgroundColor();  
        v.setDrawingCacheBackgroundColor(0);  
  
        if (color != 0) {  
            v.destroyDrawingCache();  
        }  
        v.buildDrawingCache();  
        Bitmap cacheBitmap = v.getDrawingCache();  
        if (cacheBitmap == null) {  
            Log.e("Folder", "failed getViewBitmap(" + v + ")", new RuntimeException());  
            return null;  
        }  
  
        Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);  
  
        // Restore the view  
        v.destroyDrawingCache();  
        v.setWillNotCacheDrawing(willNotCache);  
        v.setDrawingCacheBackgroundColor(color);  
  
        return bitmap;  
    }

方法三：

View view = mLauncher.getDragLayer();
view.setDrawingCacheEnabled(true);
Bitmap bitmap = view.getDrawingCache();