<!-- 显示系统窗口权限 -->
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<!-- 在 屏幕最顶部显示addview-->
<uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />

public class DifferentDislay extends Presentation {
    public DifferentDislay(Context outerContext, Display display) {
        super(outerContext,display);
        //TODOAuto-generated constructor stub
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.diffrentdisplay);
    }
}

//双屏显示
        DisplayManager mDisplayManager;//屏幕管理类
        Display[] displays;//屏幕数组
        mDisplayManager = (DisplayManager)MainActivity.this.getSystemService(Context.DISPLAY_SERVICE);
        displays =mDisplayManager.getDisplays(); //得到显示器数组
        DifferentDislay mPresentation =new DifferentDislay (getApplicationContext(),displays[1]);//displays[1]是副屏
        mPresentation.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
        mPresentation.show();