android - 如何在 Android 中将视频播放器视图拖到画中画模式？

Question

我正在使用 Exoplayer2 使用 hls url 流式传输视频，完成活动以在单击返回或单击主页按钮时进入画中画模式。我想向下拖动 exoplayer 视图进入画中画模式或向下拖动 exoplayer 视图以像画中画类型那样缩放它。

在该视频屏幕中还有其他视图，例如视频的详细信息。当我拖动 exoplayer 视图时，缩放 exoplayer 视频并淡入淡出以隐藏详细信息视图。

画中画代码

private void pictureInPictureMode() {

    if (supportsPiPMode() && getPackageManager().hasSystemFeature(PackageManager.FEATURE_PICTURE_IN_PICTURE)) {

        Rational aspectRatio = new Rational(playerView.getWidth(), playerView.getHeight());
        pictureInPictureParamsBuilder.setAspectRatio(aspectRatio).build();
        if (canEnterPiPMode()) enterPictureInPictureMode(pictureInPictureParamsBuilder.build());

    }

}

@Override
public void onPictureInPictureModeChanged(boolean isInPictureInPictureMode, Configuration newConfig) {
    inPIP = isInPictureInPictureMode;
    if (isInPictureInPictureMode) {
        landscapeViews();
        bottomAdv.setVisibility(View.GONE);
    } else {
        portraitViews();
    }
}

@Override
protected void onUserLeaveHint() {
    pictureInPictureMode();
}

private boolean canEnterPiPMode() {

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        AppOpsManager appOpsManager = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);
        return (AppOpsManager.MODE_ALLOWED == appOpsManager.checkOpNoThrow(AppOpsManager.OPSTR_PICTURE_IN_PICTURE, Process.myUid(), getPackageName()));
    }

    return false;
}

public boolean supportsPiPMode() {
    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.O;
}

指导我改进我的代码。