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Android – 双屏异显之方法二: DisplayManager

PS:
1. 使用改方法主板需连接至少两个输出显示屏；
2. 副屏内部实现与MediaRouter下一样；

使用方法

# 主屏activity内：
private SecondDisplay secondDisplay;private void dualScreen3288() {DisplayManager displayManager = (DisplayManager) getApplicationContext().getSystemService(DISPLAY_SERVICE);if (displayManager != null) {Display[] presentationDisplays = displayManager.getDisplays(DisplayManager.DISPLAY_CATEGORY_PRESENTATION);//检测到主屏外显示屏数if (presentationDisplays.length > 0) {// If there is more than one suitable presentation display, then we could consider giving the user a choice.  For this example, we simply choose the first display which is the one the system recommends as the preferred presentation display.//多个附加屏时可自由选择，这里选第一个secondDisplay = new SecondDisplay(this, presentationDisplays[0]);try {secondDisplay.show();} catch (Throwable e) {e.printStackTrace();}} else {logError("showDualScreen: 未找到副屏！");}}
}//关闭副屏
private void closeSecondScreen() {if (secondDisplay != null) {secondDisplay.release();secondDisplay.dismiss();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}
}