我希望在它下面有模糊屏幕的对话框,所以我拍摄活动的“截图”,模糊它并将对话框窗口的背景设置为BitmapDrawable.奇怪的是,对话框不再以屏幕为中心,即使调用了setCanceledOnTouchOutside(true),外部对话框也不会忽略它.

问题是：为什么这不起作用？分别如何创建模糊背景的对话框？

public class BlurDialog extends DialogFragment {

public BlurDialog() {

}

public static BlurDialog newInstance() {

return new BlurDialog();

}

@Override

public Dialog onCreateDialog(Bundle savedInstanceState) {

final AlertDialog alertDialog = new AlertDialog.Builder(getActivity())

.setTitle("Title")

.setMessage("Message")

.setPositiveButton("OK", null)

.setNegativeButton("Cancel", null)

.create();

alertDialog.setCanceledOnTouchOutside(true);

View view = getActivity().getWindow().getDecorView();

view.setDrawingCacheEnabled(true);

Bitmap b1 = view.getDrawingCache();

Rect frame = new Rect();

getActivity().getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);

int statusBarHeight = frame.top;

final int width = getActivity().getWindow().getDecorView().getWidth();

final int height = getActivity().getWindow().getDecorView().getHeight();

Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height-statusBarHeight);

//define this only once if blurring multiple times

RenderScript rs = RenderScript.create(getActivity());

//this will blur the bitmapOriginal with a radius of 8 and save it in bitmapOriginal

final Allocation input = Allocation.createFromBitmap(rs, b); //use this constructor for best performance, because it uses USAGE_SHARED mode which reuses memory

final Allocation output = Allocation.createTyped(rs, input.getType());

final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));

script.setRadius(8f);

script.setInput(input);

script.forEach(output);

output.copyTo(b);

alertDialog.getWindow().setBackgroundDrawable(new BitmapDrawable(getResources(), b));

return alertDialog;

}

}