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隐藏Android的虚拟按键(设置全屏模式)

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Android从4.0(API Level 14)之后，新增了虚拟按键来代替之前的实体按键。System Bar由顶部Status Bar和底部的Navigation Bar两部分组成。
Navigation Bar如果不进行设置就会一直显示在下方无法全屏。
Google官方提供了在>= 4.4(API 18)隐藏的方法。使用此方法可以使应用进入全屏，并且在触摸屏幕上下边缘的时候恢复虚拟按键的显示。

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//可用次函数System Bar的变化
public void InitHiedeBar() {
    final View decorView = getWindow().getDecorView();
    decorView.setOnSystemUiVisibilityChangeListener(
            new View.OnSystemUiVisibilityChangeListener() {
                @Override
                public void onSystemUiVisibilityChange(int i) {
                    int height = decorView.getHeight();
                    Log.i(TAG, "Current height: " + height);
                }
            });
}


//官方给出的进入和退出全屏的方法，调用一次进入全屏模式，再次调用退出。
public void toggleHideBar() {
    // The UI options currently enabled are represented by a bitfield.
    // getSystemUiVisibility() gives us that bitfield.
    int uiOptions = getWindow().getDecorView().getSystemUiVisibility();
    int newUiOptions = uiOptions;
    boolean isImmersiveModeEnabled =
            ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions);
    if (isImmersiveModeEnabled) {
        Log.i(TAG, "Turning immersive mode mode off. ");
    } else {
        Log.i(TAG, "Turning immersive mode mode on.");
    }

    // Navigation bar hiding:  Backwards compatible to ICS.
    if (Build.VERSION.SDK_INT >= 14) {
        newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
    }

    // Status bar hiding: Backwards compatible to Jellybean
    if (Build.VERSION.SDK_INT >= 16) {
        newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN;
    }

    // Immersive mode: Backward compatible to KitKat.
    // Note that this flag doesn't do anything by itself, it only augments the behavior
    // of HIDE_NAVIGATION and FLAG_FULLSCREEN.  For the purposes of this sample
    // all three flags are being toggled together.
    // Note that there are two immersive mode UI flags, one of which is referred to as "sticky".
    // Sticky immersive mode differs in that it makes the navigation and status bars
    // semi-transparent, and the UI flag does not get cleared when the user interacts with
    // the screen.
    if (Build.VERSION.SDK_INT >= 18) {
        newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
    }
    getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
}

有些需要注意的问题：
当切换到别的Activity之后，或者应用最小化再从后台恢复之后，全屏状态会被解除。如果需要一直保持全屏状态需要做如下处理：

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//设置全屏模式
public void HideBar( ) {
    int uiOptions = getWindow().getDecorView().getSystemUiVisibility();
    int newUiOptions = uiOptions;
    // Navigation bar hiding:  Backwards compatible to ICS.
    if (Build.VERSION.SDK_INT >= 14) {
        newUiOptions |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
    }
    // Status bar hiding: Backwards compatible to Jellybean
    if (Build.VERSION.SDK_INT >= 16) {
        newUiOptions |= View.SYSTEM_UI_FLAG_FULLSCREEN;
    }
    if (Build.VERSION.SDK_INT >= 18) {
        newUiOptions |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
    }
    getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
}

在Activity的onResu中调用HideBar

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@Override
protected void onResume() {
  super.onResume();
      HideBar( );
}

这样就可以保证一直是全屏状态了