createScreenCaptureIntent 不返回结果

Question

我正在尝试处理新的Android Lollipop MediaProjection API。

我发现（至少在我的股票三星Galaxy S4 jfltexx上）当我开始打算获得捕获屏幕的权限（ProjectionManager.createScreenCaptureIntent()）时，除非我在之前的尝试中选中了"不要再问"，否则我不会在onActivityResult中得到结果。。。

private static final int ALLOW_SCREENSHOT_REQ = 102;
{
 ...
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            System.out.println("request permission");
            startActivityForResult(mProjectionManager.createScreenCaptureIntent(), ALLOW_SCREENSHOT_REQ);
        }
 ...
}

以及结果处理：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    System.out.println("RebootActivity.onActivityResult(" + requestCode + "," + resultCode + ", data)");
}

权限对话框显示得很好，但我的活动被隐藏了，它从未进入onActivityResult。

知道出了什么问题吗？

Answer 1

你这样尝试过吗：参见完整示例android ScreenCapture

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_MEDIA_PROJECTION) {
        if (resultCode != Activity.RESULT_OK) {
            Log.i(TAG, "User cancelled");
            Toast.makeText(getActivity(), R.string.user_cancelled, Toast.LENGTH_SHORT).show();
            return;
        }
        Activity activity = getActivity();
        if (activity == null) {
            return;
        }
        Log.i(TAG, "Starting screen capture");
        mResultCode = resultCode;
        mResultData = data;
        setUpMediaProjection();
        setUpVirtualDisplay();
    }
}

希望它能帮助你。