DisplayManager

    private void showOtherDisPlay() {
        DisplayManager displayManager = (DisplayManager) this.getSystemService(Context.DISPLAY_SERVICE);
        presentationDisplays = displayManager.getDisplays();
        if (presentationDisplays.length > 1) {
            presentation = new DifferentDisplay(getApplicationContext(), presentationDisplays[1
 
]);
            presentation.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
            presentation.show();
            videoView = presentation.videoView;
            rn_layout = presentation.localView;
            JCManager.getInstance().mediaDevice.specifyCamera(1, 640, 320);
            JCMediaDeviceVideoCanvas mLocalCanvas = JCManager.getInstance
 
().mediaDevice.startCameraVideo(JCMediaDevice.RENDER_FULL_CONTENT);
            mLocalCanvas.getVideoView().setZOrderMediaOverlay(true);
            mLocalCanvas.getVideoView().setId(View.generateViewId());
            rn_layout.addView(mLocalCanvas.getVideoView(), 0);
        } else {
            //  presentation = new DifferentDisplay( this, presentationDisplays[0
 
]);
        }
    }

獲取螢幕的方式還用另一種

Presentation

public class DifferentDisplay extends Presentation {
    public VideoView videoView;
    public RelativeLayout localView;

    public DifferentDisplay(Context outerContext, Display display) {
        super(outerContext, display);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.play_video);

        videoView = (VideoView ) findViewById(R.id.video_view);
        localView = findViewById(R.id.loacol_view);
    }

}

此為dialog,需要注意的是此dialog的生命週期是跟隨activity的，當activity不再主顯示那麼此Presentation 就會銷燬。

最終採用的方案是將dialog級別設定為懸浮視窗：

presentation = new DifferentDisplay(getApplicationContext(), presentationDisplays[1]);
            presentation.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);