Android TV 遥控器切换主副屏

private final List<CameraPreviewHolder> cameraPreviewHolderList = new ArrayList<>(2);

cameraPreviewHolderList.get(1).toSecondary();//用较小尺寸创造副屏

public boolean onKeyDown(int keyCode, KeyEvent event) {
        AppLogger.e("keyCode=" + keyCode + ", event=" + event.getAction());
        if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN ||
                keyCode == KeyEvent.KEYCODE_DPAD_LEFT ||
                keyCode == KeyEvent.KEYCODE_DPAD_UP ||
                keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
            long diff = System.currentTimeMillis() - lastExchangeTime;
            if (this.deviceCount == 2 && diff >= 5000 && this.cameraPreviewList.size() > 0) {
                synchronized (this.cameraPreviewList) {
                    this.lastExchangeTime = System.currentTimeMillis();
                    // 交换主副屏
                    exchangeCameraPreview();
                }
            }
            return true;
        }
       

        return super.onKeyDown(keyCode, event);
    }

 private void exchangeCameraPreview() {
        final int previewSize = this.cameraPreviewList.size();
        final CameraPreviewHolder primaryHolder = cameraPreviewHolderList.get(0);
        final CameraPreviewHolder secondaryHolder = cameraPreviewHolderList.get(1);
        if (previewSize == 1) {
            final CameraPreview cameraPreview = this.cameraPreviewList.get(0);
            cameraPreview.stop();
            if (primaryHolder.videoShowing()) {
                primaryHolder.hideVideo();
                cameraPreview.play(secondaryHolder.getSurfaceView());
                secondaryHolder.showVideo();
            } else {
                secondaryHolder.hideVideo();
                cameraPreview.play(primaryHolder.getSurfaceView());
                primaryHolder.showVideo();
            }
        } else if (previewSize == 2) {
            final CameraPreview primaryPreview = this.cameraPreviewList.get(0);
            final CameraPreview secondaryPreview = this.cameraPreviewList.get(1);
            primaryPreview.stop();
            secondaryPreview.stop();

            if (primaryPreview.getSurfaceView() == primaryHolder.getSurfaceView()) {
                primaryPreview.play(secondaryHolder.getSurfaceView());
                secondaryPreview.play(primaryHolder.getSurfaceView());
            } else {
                primaryPreview.play(primaryHolder.getSurfaceView());
                secondaryPreview.play(secondaryHolder.getSurfaceView());
            }
        }
    }

public void toSecondary() {
        if (this.surfaceView == null) {
            return;
        }
        int height = (int) (Settings.DISPLAY_HEIGHT * 0.3);
        int width = (int) ((16 / 9.0) * height);
        AppLogger.e("DISPLAY_HEIGHT=" + Settings.DISPLAY_HEIGHT + ", height=" + height + ", width=" + width);
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(width, height);
        params.topMargin=6;
        params.leftMargin=6;
        this.surfaceView.setLayoutParams(params);
        this.surfaceView.getHolder().setFixedSize(width, height);
        this.surfaceView.setZOrderMediaOverlay(true);
        this.surfaceView.setZOrderOnTop(true);
        if (this.noVideoView != null) {
            this.noVideoView.setLayoutParams(new FrameLayout.LayoutParams(width, height));
            ImageView imageView=noVideoView.findViewById(R.id.no_video);
            RelativeLayout.LayoutParams rlparams = new RelativeLayout.LayoutParams(120, 120);
            rlparams.addRule(RelativeLayout.CENTER_IN_PARENT);
            imageView.setLayoutParams(rlparams);
        }
    }