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();

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