Android – 双屏异显之方法一：MediaRouter

PS:
1. 部分主板可能不支持，得验证；
2. 副屏输出可以不用连接显示屏也能正常后台运行；
3. 主屏Activity内控制副屏；
4. 副屏截图命令：screencap -p -d 1 <path_name>;（-d 1 副屏截屏）

使用方法：

//主屏activity内
private MediaRouter mMediaRouter;
private SecondDisplay secondDisplay;//控制副屏显隐
public void onSecondChange(View view) {if (secondDisplay == null) {showSecondScreen();} else {closeSecondScreen();}
}
//====================================
private void showSecondScreen() {if (secondDisplay != null) {return;}mMediaRouter = (MediaRouter) getSystemService(Context.MEDIA_ROUTER_SERVICE);updatePresentation();
}private void closeSecondScreen() {if (secondDisplay != null) {secondDisplay.release();secondDisplay.dismiss();secondDisplay = null;}
}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;// Dismiss the current presentation if the display has changed.if (secondDisplay != null && secondDisplay.getDisplay() != presentationDisplay) {secondDisplay.dismiss();secondDisplay = null;}// Show a new presentation if needed.if (secondDisplay == null && presentationDisplay != null) {secondDisplay = new SecondDisplay(this, presentationDisplay);secondDisplay.setOnDismissListener(mOnDismissListener);try {secondDisplay.show();} catch (WindowManager.InvalidDisplayException ex) {secondDisplay = null;ex.printStackTrace();}}
}//副屏关闭监听
private final DialogInterface.OnDismissListener mOnDismissListener = new DialogInterface.OnDismissListener() {@Overridepublic void onDismiss(DialogInterface dialog) {if (dialog == secondDisplay) {secondDisplay = null;}}
};

SecondDisplay.java (副屏类)

//主要继承Presentation类
public class SecondDisplay extends Presentation {private static final String TAG = "SecondDisplay";private Context mContext;//构造函数public SecondDisplay(Context outerContext, Display display) {super(outerContext, display);this.mContext = outerContext;}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//副屏布局，与activity内一样setContentView(R.layout.layout_second);initUI();}private void initUI() {//绑定控件}public void release() {//关闭页面前注销资源}
}