Implement Picture-in-Picture on Android

1. Configure properties

The PiP API is scoped to an Activity. Declare the following properties for the Activity in your AndroidManifest.xml file.

• android:supportsPictureInPicture="true"

• android:configChanges="screenSize|smallestScreenSize|screenLayout|orientation"

<activity android:name=".PictureInPicture.PictureInPictureAcitivity"
  android:label="@string/picture_in_picture"
  android:exported="false"
  android:supportsPictureInPicture="true"
  android:configChanges="screenSize|smallestScreenSize|screenLayout|orientation"
  android:resizeableActivity="true"
  android:launchMode="singleTask"
  tools:targetApi="24" />

2. Enter Picture-in-Picture mode

• Not all devices support PiP. Call the hasSystemFeature method to check for support before entering this mode.

• Call the enterPictureInPictureMode system API to enter PiP mode.

private void enterPIPMode(){
    if(!hasJoined) {
        ToastHelper.showToast(this, "Join a channel first", Toast.LENGTH_SHORT);
        return;
    }
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        if(getPackageManager().hasSystemFeature(PackageManager.FEATURE_PICTURE_IN_PICTURE)) {
            Rational aspectRatio = new Rational(9, 16); // Recommended video aspect ratio
            PictureInPictureParams params = new PictureInPictureParams.Builder()
            .setAspectRatio(aspectRatio)
            .build();
            enterPictureInPictureMode(params);
        } else {
            ToastHelper.showToast(this, "This device does not support PiP", Toast.LENGTH_SHORT);
        }
    } else {
        ToastHelper.showToast(this, "PiP is supported only on Android 8.0 and later", Toast.LENGTH_SHORT);
    }
}

3. Respond to PiP mode changes

Override the onPictureInPictureModeChanged system callback to update the UI when the mode changes.

@Override
public void onPictureInPictureModeChanged(boolean isInPictureInPictureMode, Configuration newConfig) {
    super.onPictureInPictureModeChanged(isInPictureInPictureMode, newConfig);
    if (isInPictureInPictureMode) {
        // Enter PiP mode: Hide the full-screen UI and show only the video.
        findViewById(R.id.ll_channel_layout).setVisibility(View.GONE);
        findViewById(R.id.scroll_remote_container).setVisibility(View.GONE);

        // Optional: Hide the status bar.
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);

        // Optional: Create a dedicated video container for PiP.
        showPipVideoContainer();
    } else {
        // Exit PiP mode: Restore the full-screen UI.
        findViewById(R.id.ll_channel_layout).setVisibility(View.VISIBLE);
        findViewById(R.id.scroll_remote_container).setVisibility(View.VISIBLE);
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);

        // Re-attach the local preview view.
        if (mAliRtcEngine != null && mLocalVideoCanvas != null) {
            mAliRtcEngine.setLocalViewConfig(mLocalVideoCanvas, AliRtcVideoTrackCamera);
        }

        // Remove the PiP container.
        removePipVideoContainer();
    }
}

/**
 * Shows the main video container in PiP mode, such as the local preview.
 */
private void showPipVideoContainer() {
    if (mPipVideoContainer == null) {
        mPipVideoContainer = new FrameLayout(this);
        mPipVideoContainer.setBackgroundColor(Color.BLACK);
        addContentView(mPipVideoContainer, new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));

        // Recreate the local preview view. You cannot move a SurfaceView, so you must recreate it.
        SurfaceView surfaceView = mAliRtcEngine.createRenderSurfaceView(this);
        surfaceView.setZOrderOnTop(true);
        surfaceView.setZOrderMediaOverlay(true);

        mPipVideoContainer.addView(surfaceView, new FrameLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));

        if(mAliRtcEngine != null) {
            AliRtcEngine.AliRtcVideoCanvas canvas = new AliRtcEngine.AliRtcVideoCanvas();
            canvas.view = surfaceView;
            mAliRtcEngine.setLocalViewConfig(canvas, AliRtcVideoTrackCamera);
        }
    }
}

/**
 * Removes the PiP video container.
 */
private void removePipVideoContainer() {
    if (mPipVideoContainer != null && mPipVideoContainer.getParent() != null) {
        ((ViewGroup) mPipVideoContainer.getParent()).removeView(mPipVideoContainer);
        mPipVideoContainer = null;
    }
}