Android 对底部虚拟键的显示和隐藏

场景：播放全屏视频或则游戏界面会隐藏虚拟按键，其余界面会显示虚拟按键。

1.隐藏底部虚拟按钮：

/**
    * 隐藏虚拟按键
    */
public void goneSystemUi(){
    //隐藏虚拟按键
    if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) {
        View v = getWindow().getDecorView();
        v.setSystemUiVisibility(View.GONE);
    } else if (Build.VERSION.SDK_INT >= 19) {
        View decorView = getWindow().getDecorView();
        int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                | View.SYSTEM_UI_FLAG_FULLSCREEN;
        decorView.setSystemUiVisibility(uiOptions);
    }
}

2.显示底部虚拟按钮：

/**
 * 显示虚拟按键
 */
public void visibleSystemUi(){
    //显示虚拟键盘
    if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) {
        //低版本sdk
        View v = getWindow().getDecorView();
        v.setSystemUiVisibility(View.VISIBLE);
    } else if (Build.VERSION.SDK_INT >= 19) {
        View decorView = getWindow().getDecorView();
        int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;
        decorView.setSystemUiVisibility(uiOptions);
    }
}

在代码中设置标题栏，全屏和横屏。注意：这些设置都不需在

setContentView()前面调用

requestWindowFeature(Window.FEATURE_NO_TITLE);//无标题栏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//全屏
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);//横屏