应用的地方，app中需要保存某个页面的截图，可以用到；
public static Bitmap convertViewToBitmap(View view){
view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
view.buildDrawingCache();
Bitmap bitmap = view.getDrawingCache();
return bitmap;
}
引用：http://www.cnblogs.com/devinzhang/archive/2012/06/05/2536848.html
