把View转化成Bitmap的方法

方法一：

/**
* 把View绘制到Bitmap上
* @param view 需要绘制的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;
}

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;  
    }

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