开发中，有时候需要获取View的截图来做动画来达到动画流程的目的
原理：将View的内容画到一个Bitmap画布上，然后取出
下面封装了一个从View生成Bitmap的工具类
/**
* 将View转换为Bitmap对象
*/
public class ViewToBitmapUtil { private static final String TAG = "ViewToBitmapUtil"; 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();
// 或者可以使用下面的方法
// view.setDrawingCacheEnabled(true);
// Bitmap bmp = Bitmap.createBitmap(view.getDrawingCache());
return bitmap;
} public static Bitmap convertViewToBitmap(View view, int bitmapWidth, int bitmapHeight) {
Bitmap bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);
view.draw(new Canvas(bitmap));
return bitmap;
} public static void getScreenRectOfView(View view, Rect outRect) {
int pos[] = new int[2];
view.getLocationOnScreen(pos);
outRect.set(pos[0], pos[1], pos[0] + view.getWidth(), pos[1] + view.getHeight());
}
}