隐藏状态栏及虚拟键

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if (Build.VERSION.SDK_INT < 14) return; 
mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE 
    | View.SYSTEM_UI_FLAG_FULLSCREEN 
    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE 
    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY 
    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 
    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);