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      1 /*
      2 * Copyright (C) 2013 The Android Open Source Project
      3 *
      4 * Licensed under the Apache License, Version 2.0 (the "License");
      5 * you may not use this file except in compliance with the License.
      6 * You may obtain a copy of the License at
      7 *
      8 *      http://www.apache.org/licenses/LICENSE-2.0
      9 *
     10 * Unless required by applicable law or agreed to in writing, software
     11 * distributed under the License is distributed on an "AS IS" BASIS,
     12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13 * See the License for the specific language governing permissions and
     14 * limitations under the License.
     15 */
     16 package com.example.android.basicimmersivemode;
     17 
     18 import android.os.Bundle;
     19 import android.support.v4.app.Fragment;
     20 import android.view.MenuItem;
     21 import android.view.View;
     22 
     23 import com.example.android.common.logger.Log;
     24 
     25 public class BasicImmersiveModeFragment extends Fragment {
     26 
     27     public static final String TAG = "BasicImmersiveModeFragment";
     28 
     29     @Override
     30     public void onCreate(Bundle savedInstanceState) {
     31         super.onCreate(savedInstanceState);
     32         setHasOptionsMenu(true);
     33     }
     34 
     35     @Override
     36     public void onActivityCreated(Bundle savedInstanceState) {
     37         super.onActivityCreated(savedInstanceState);
     38         final View decorView = getActivity().getWindow().getDecorView();
     39         decorView.setOnSystemUiVisibilityChangeListener(
     40                 new View.OnSystemUiVisibilityChangeListener() {
     41                     @Override
     42                     public void onSystemUiVisibilityChange(int i) {
     43                         int height = decorView.getHeight();
     44                         Log.i(TAG, "Current height: " + height);
     45                     }
     46                 });
     47     }
     48 
     49     @Override
     50     public boolean onOptionsItemSelected(MenuItem item) {
     51         if (item.getItemId() == R.id.sample_action) {
     52             toggleHideyBar();
     53         }
     54         return true;
     55     }
     56 
     57     /**
     58      * Detects and toggles immersive mode.
     59      */
     60     public void toggleHideyBar() {
     61         // BEGIN_INCLUDE (get_current_ui_flags)
     62         // The UI options currently enabled are represented by a bitfield.
     63         // getSystemUiVisibility() gives us that bitfield.
     64         int uiOptions = getActivity().getWindow().getDecorView().getSystemUiVisibility();
     65         int newUiOptions = uiOptions;
     66         // END_INCLUDE (get_current_ui_flags)
     67         // BEGIN_INCLUDE (toggle_ui_flags)
     68         boolean isImmersiveModeEnabled =
     69                 ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions);
     70         if (isImmersiveModeEnabled) {
     71             Log.i(TAG, "Turning immersive mode mode off. ");
     72         } else {
     73             Log.i(TAG, "Turning immersive mode mode on.");
     74         }
     75 
     76         // Immersive mode: Backward compatible to KitKat (API 19).
     77         // Note that this flag doesn't do anything by itself, it only augments the behavior
     78         // of HIDE_NAVIGATION and FLAG_FULLSCREEN.  For the purposes of this sample
     79         // all three flags are being toggled together.
     80         // This sample uses the "sticky" form of immersive mode, which will let the user swipe
     81         // the bars back in again, but will automatically make them disappear a few seconds later.
     82         newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
     83         newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN;
     84         newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
     85         getActivity().getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
     86         //END_INCLUDE (set_ui_flags)
     87     }
     88 }
     89