Android如何使Activity全屏

public class FullScreen extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.main);
    }
}

Alternatively you can add

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

to AndroidManifest.xml under

 

但是经过尝试，发现还需要在AndroidMainfest里设置：

 

，否则无法正确全屏，原因不清楚。折腾了好久。