android app开发全屏显示

方法1，api26 android8.0

 // 隐藏标题栏
    supportRequestWindowFeature(Window.FEATURE_NO_TITLE);

    View decorView = getWindow().getDecorView();
    int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN
            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;

    decorView.setSystemUiVisibility(uiOptions);

    // 隐藏 ActionBar
    if (getSupportActionBar() != null) {
        getSupportActionBar().hide();
    }

方法2 

 // 隐藏标题栏
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        // 隐藏状态栏
        getWindow().setFlags(
                WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN
        );