Android 扩展屏幕 实现主屏副屏同步或者异步显示

android的扩展屏幕是通过Presentation 类实现的。

Presentation继承自  Dialog。

 

• 主屏显示的代码
• 主屏播放一个video3的视频 。video3在项目的 assets文件里 可以随便拷贝一个放进去。

import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaRouter;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageButton;
import com.xinyintai.guoruiyibushow.R;
import java.io.IOException;

/**
 * 用于测试   android 异步播放。
 * 

 * 主界面 lvds 信号播放的界面。
 */

public class MainActivity extends Activity {
    private MediaRouter mMediaRouter;
    private DemoPresentation mPresentation;
    int flag = 2;//   1 绿色同步 2 蓝色异步

    private SurfaceView surfaceView;
    private MediaPlayer mediaPlayer1;
    ImageButton bt;
    String TAG = "MainActivity";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 得到media router service.
        mMediaRouter = (MediaRouter) getSystemService(Context.MEDIA_ROUTER_SERVICE);
        setContentView(R.layout.activity_main);
        //监听media rotues的改变
        mMediaRouter.addCallback(MediaRouter.ROUTE_TYPE_LIVE_VIDEO, mMediaRouterCallback);
        initMainPlay();//主屏幕
        updatePresentation();//扩展屏幕
    }

    //主屏幕播放 video3视频
    private void initMainPlay() {
        mediaPlayer1 = new MediaPlayer();
        surfaceView = this.findViewById(R.id.surface1);
        bt = findViewById(R.id.iv_state);
        surfaceView.getHolder().setKeepScreenOn(true);
        surfaceView.getHolder().addCallback(new SurfaceViewLis());
        mediaPlayer1.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                play();
            }
        });

        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (flag == 1) {//绿色异步
                    try {
                        mPresentation.show();//异步让这个dialog展示
                    } catch (WindowManager.InvalidDisplayException ex) {
                        // Log.w(TAG, "Couldn't show presentation!  Display was removed in "+ "the meantime.", ex);
                        mPresentation = null;
                    }
                    bt.setBackground(getResources().getDrawable(R.drawable.circle_blue));
                    flag = 2;
                } else if (flag == 2) {//蓝色同步
                    mPresentation.dismiss();//同步让presentation消失
                    bt.setBackground(getResources().getDrawable(R.drawable.circle_green));
                    flag = 1;
                }
            }
        });
    }


    public void play() {
        mediaPlayer1.reset();
        mediaPlayer1.setAudioStreamType(AudioManager.STREAM_MUSIC);

        try {
            mediaPlayer1.setDataSource(this, Uri.parse("android.resource://" + "com.xinyintai.guoruiyibushow" + "/" + R.raw.video3));
            // 把视频输出到SurfaceView上
            mediaPlayer1.setDisplay(surfaceView.getHolder());
            mediaPlayer1.prepare();
            mediaPlayer1.start();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private class SurfaceViewLis implements SurfaceHolder.Callback {
        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width,
                                   int height) {
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {

            try {
                play();
                mediaPlayer1.seekTo(0);
            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {

        }

    }


    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
    }

    private final MediaRouter.SimpleCallback mMediaRouterCallback =
            new MediaRouter.SimpleCallback() {
                @Override
                public void onRouteSelected(MediaRouter router, int type, MediaRouter.RouteInfo info) {
                    Log.e(TAG, "onRouteSelected: type=" + type + ", info=" + info);
                    updatePresentation();
                }

                @Override
                public void onRouteUnselected(MediaRouter router, int type, MediaRouter.RouteInfo info) {
                    Log.e(TAG, "onRouteeUnselected: type=" + type + ", info=" + info);
                    updatePresentation();
                }

                @Override
                public void onRoutePresentationDisplayChanged(MediaRouter router, MediaRouter.RouteInfo info) {
                    Log.e(TAG, "onRoutePresentationDisplayChanged: info=" + info);
                    updatePresentation();
                }
            };


    //准备异步的界面
    private void updatePresentation() {
        // Get the current route and its presentation display.
        MediaRouter.RouteInfo route = mMediaRouter.getSelectedRoute(MediaRouter.ROUTE_TYPE_LIVE_VIDEO);
        Display presentationDisplay = route != null ? route.getPresentationDisplay() : null;

        // 如果屏幕显示改变了 让当前的扩展屏消失
        if (mPresentation != null && mPresentation.getDisplay() != presentationDisplay) {
            //Log.i(TAG, "Dismissing presentation because the current route no longer "+ "has a presentation display.");
            mPresentation.dismiss();
            mPresentation = null;
        }

        //创建一个扩展屏
        if (mPresentation == null && presentationDisplay != null) {
            Log.e(TAG, "Showing presentation on display: " + presentationDisplay);
            mPresentation = new DemoPresentation(this, presentationDisplay);
            mPresentation.setOnDismissListener(mOnDismissListener);
            mPresentation.show();
        }

        updateContents();
    }


    //更新主界面中的内容
    private void updateContents() {

    }

    /**
     * 监听 副屏界面的消失 更新主界面。
     */
    private final DialogInterface.OnDismissListener mOnDismissListener =
            new DialogInterface.OnDismissListener() {
                @Override
                public void onDismiss(DialogInterface dialog) {
                    if (dialog == mPresentation) {
                        //Log.i(TAG, "Presentation was dismissed.");mPresentation = null;
                        updateContents();
                    }
                }
            };

}

• 主界面的布局 一个surfaceview用来播放视频。imagebutton用来切换同步异步的按钮。

   


   
   
   
 

*imagebutton的按钮background的背景。改一个绿色和蓝色的颜色即可



    
    
    

 

• 副屏的展示界面
• 副屏是用HDMI给的信号。
• 副屏的播放一个video的视频 。video在项目的 assets文件里 可以随便拷贝一个放进去。

import android.app.Presentation;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import com.xinyintai.guoruiyibushow.R;
import java.io.IOException;
import static android.content.ContentValues.TAG;

/**
 * 用于测试   android 异步播放。
 * 

 * 副屏界面   hdmi信号口
 */

public class DemoPresentation extends Presentation {
    private SurfaceView surfaceView;
    private MediaPlayer mediaPlayer1;
    boolean isLeave = true;


    public DemoPresentation(Context context, Display display) {
        super(context, display);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.presentation_content);
        // Set up the surface view for visual interest.
        mediaPlayer1 = new MediaPlayer();
        surfaceView = this.findViewById(R.id.surface2);
        surfaceView.getHolder().setKeepScreenOn(true);
        surfaceView.getHolder().addCallback(new SurfaceViewLis());

        mediaPlayer1.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                if (isLeave) {
                    play("android.resource://" + "com.xinyintai.guoruiyibushow" + "/" + R.raw.video);
                }
            }
        });
    }


    public void pause() {
        mediaPlayer1.pause();
    }

    public void play(String path) {
        if (surfaceView != null) {
            mediaPlayer1.reset();
            mediaPlayer1.setAudioStreamType(AudioManager.STREAM_MUSIC);
            try {
                mediaPlayer1.setDataSource(getContext(), Uri.parse(path));
                // 把视频输出到SurfaceView上
                mediaPlayer1.setDisplay(surfaceView.getHolder());
                mediaPlayer1.prepare();
                mediaPlayer1.start();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

    private class SurfaceViewLis implements SurfaceHolder.Callback {
        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width,
                                   int height) {
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            Log.e(TAG, "surfaceCreated: surfaceivew产生了");
            try {
                play("android.resource://" + "com.xinyintai.guoruiyibushow" + "/" + R.raw.video);
                mediaPlayer1.seekTo(0);
            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {

        }

    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        isLeave = false;
        Log.e(TAG, "onDetachedFromWindow: 副屏消失了");
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        Log.e(TAG, "onAttachedToWindow: 副屏显示了");
        isLeave = true;
    }

    @Override
    protected void onStop() {
        super.onStop();
    }
}

 

• 副屏的布局只有一个surfaceview用来播放视频

 

这样就实现了主屏和副屏同时播放视频。可以在主屏通过按钮。切换同步或者异步播放的功能。