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;
    }

    @Override
    protected 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
    }
}