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。* <p>* 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";@Overrideprotected 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() {@Overridepublic void onCompletion(MediaPlayer mp) {play();}});bt.setOnClickListener(new View.OnClickListener() {@Overridepublic 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 {@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}@Overridepublic void surfaceCreated(SurfaceHolder holder) {try {play();mediaPlayer1.seekTo(0);} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {}}@Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume();}private final MediaRouter.SimpleCallback mMediaRouterCallback =new MediaRouter.SimpleCallback() {@Overridepublic void onRouteSelected(MediaRouter router, int type, MediaRouter.RouteInfo info) {Log.e(TAG, "onRouteSelected: type=" + type + ", info=" + info);updatePresentation();}@Overridepublic void onRouteUnselected(MediaRouter router, int type, MediaRouter.RouteInfo info) {Log.e(TAG, "onRouteeUnselected: type=" + type + ", info=" + info);updatePresentation();}@Overridepublic 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() {@Overridepublic 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。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context=".demo.MainActivity" ><SurfaceView  android:id="@+id/surface1"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:layout_centerInParent="true" /><!--切换同步异步的按钮的小按钮--><ImageButtonandroid:id="@+id/iv_state"android:visibility="visible"android:layout_alignParentLeft="true"android:layout_alignParentBottom="true"android:layout_marginLeft="5dp"android:layout_marginBottom="5dp"android:background="@drawable/circle_green"android:layout_width="50dp"android:layout_height="50dp" /></RelativeLayout> *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"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="oval"android:useLevel="false"><size android:width="21dp"android:height="21dp" /><strokeandroid:width="0dp"android:color="@android:color/white" /><solidandroid:color="@color/colorPrimaryDark" />
</shape>

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。* <p>* 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);}@Overrideprotected 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() {@Overridepublic 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 {@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}@Overridepublic 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 blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {}}@Overridepublic void onDetachedFromWindow() {super.onDetachedFromWindow();isLeave = false;Log.e(TAG, "onDetachedFromWindow: 副屏消失了");}@Overridepublic void onAttachedToWindow() {super.onAttachedToWindow();Log.e(TAG, "onAttachedToWindow: 副屏显示了");isLeave = true;}@Overrideprotected void onStop() {super.onStop();}
}

副屏的布局只有一个surfaceview用来播放视频

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context=".demo.MainActivity" ><SurfaceView  android:id="@+id/surface2"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:layout_centerInParent="true" />   </RelativeLayout>

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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