Android(安卓)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<?xml version="1.0" encoding="utf-8"?>

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。

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