手机屏幕尺寸怎么量 Android APP适配全面屏手机的技术要点(8)

3、SYSTEM_UI_FLAG_IMMERSIVE_STICKY配合SYSTEM_UI_FLAG_HIDE_NAVIGATION和SYSTEM_UI_FLAG_FULLSCREEN使用

用户操作不会清除SYSTEM_UI_FLAG_HIDE_NAVIGATION和SYSTEM_UI_FLAG_FULLSCREEN。会一直保持全屏模式。显示切换时也会触发View.OnSystemUiVisibilityChangeListener，全屏模式时，从原本状态栏或者虚拟按键的位置 响屏幕内部滑动，状态栏和虚拟按键栏会暂时可见，一段时间后自动隐藏。与SYSTEM_UI_FLAG_IMMERSIVE不同的是，因为是临时的显示，所以不会触发OnSystemUiVisibilityChangeListener。

通过下面的两个方法，可以简单实现SYSTEM_UI_FLAG_IMMERSIVE_STICKY模式下，全屏和非全屏之间的切换：

public void showBar(){  
    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. ");  
        //先取 非 后再 与， 把对应位置的1 置成0，原本为0的还是0  
        if (Build.VERSION.SDK_INT >= 14) {  
            newUiOptions &= ~View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;  
        }
        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);  
    }  
}  


public void hideBar() {  
    // 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 on. ");  
        if (Build.VERSION.SDK_INT >= 14) {  
            newUiOptions |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;  
        }
        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);  
    }  
}  

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