失去焦点时隐藏系统栏

Question

我使用的显示在锁定屏幕上方的网页流量，还我的时间很短的时间后自动隐藏系统栏：

/** 
* Class used to hide the device System UI bar. 
* 
*/ 
public class SystemUiHider { 
    /** 
    * Delay until to hide the bar. 
    */ 
    private static final int HIDE_DELAY_MILLIS = 3000; 

    /** 
    * Declare the handler. 
    */ 
    private Handler mHandler; 
    /** 
    * Declare the view on which to hide the bar. 
    */ 
    private View mView; 

    private Utils utils; 

    /** 
    * Set the class view to be used. 
    * 
    * @param view 
    */ 
    public SystemUiHider(final View view, final Context context) { 
     this.mView = view; 
     this.utils = new Utils(context); 

    } 

    /** 
    * Setup used to hide the system bar and start the handler. 
    */ 
    public final void setup() { 
     hideSystemUi(); 
     this.mHandler = new Handler(); 
     mView.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() { 
      @Override 
      public void onSystemUiVisibilityChange(final int visibility) { 
       if (visibility != View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) { 
        delay(); 
       } 
      } 
     }); 
    } 

    /** 
    * Set the flag to hidden for the view. 
    */ 
    private void hideSystemUi() { 
     utils.hideSystemBar(WebViewActivity.appContext); 
    } 

    /** 
    * Set the runnable that runs on a different thread to call the method 
    * hiding the system bar. 
    */ 
    private Runnable mHideRunnable = new Runnable() { 
     public void run() { 
      hideSystemUi(); 
     } 
    }; 

    /** 
    * Set the delay until to hide the system bar. 
    */ 
    private void delay() { 
     mHandler.removeCallbacks(mHideRunnable); 
     mHandler.postDelayed(mHideRunnable, HIDE_DELAY_MILLIS); 
    } 
} 

这是隐藏系统栏的方法：

/** 
* Hide system bar. 
* Different methods applied depending on the SDK version 
* 
* @param context 
*/ 
@SuppressLint("InlinedApi") 
@SuppressWarnings("deprecation") 
public void hideSystemBar(Context context) { 
    if (SDK_INT < FOURTEEN) { 
     Log.i("WebViewClient", "hideSystemBar: < 14 "); 
     ((Activity) context).getWindow().getDecorView().setSystemUiVisibility(View.STATUS_BAR_HIDDEN); 
    } else if (SDK_INT >= FOURTEEN && SDK_INT < SIXTEEN) { 
     Log.i("WebViewClient", "hideSystemBar: 14 - 16"); 
     ((Activity) context).getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE // 14 
       | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);               // 14 
    } else if (SDK_INT >= SIXTEEN) { 
     Log.i("WebViewClient", "hideSystemBar: > 16"); 
     ((Activity) context).getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE // 14 
       | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION               // 14 
       | View.SYSTEM_UI_FLAG_FULLSCREEN);                // 16 
    } 
} 

我遇到的问题是我的web视图失去焦点时使用此。我的猜测是因为((Activity) context).getWindow().getDecorView()

是否有替代方法来显示锁定屏幕顶部的活动并隐藏系统栏而不失去焦点？

谢谢。

Answer 1

经过一番搜索，我结束了这样做。需要在其他api上测试它，但现在应用程序的重点仍然在于此。

private void hideSystemUI() { 
    int visibility = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LOW_PROFILE; 

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { 
     visibility |= View.SYSTEM_UI_FLAG_LAYOUT_STABLE 
       | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 
       | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN 
       | View.SYSTEM_UI_FLAG_FULLSCREEN; 
    } 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { 
     visibility |= View.SYSTEM_UI_FLAG_IMMERSIVE; 
    } 
    getActivity().getWindow().getDecorView().setSystemUiVisibility(visibility); 
}