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      1 /*
      2  * Copyright 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 
     17 package com.example.android.immersive;
     18 
     19 import android.app.Activity;
     20 import android.os.Bundle;
     21 import android.os.Handler;
     22 import android.os.Message;
     23 import android.view.GestureDetector;
     24 import android.view.MotionEvent;
     25 import android.view.View;
     26 
     27 public class ImmersiveActivity extends Activity {
     28     private static final int INITIAL_HIDE_DELAY = 300;
     29 
     30     private View mDecorView;
     31 
     32     @Override
     33     protected void onCreate(Bundle savedInstanceState) {
     34         super.onCreate(savedInstanceState);
     35         setContentView(R.layout.immersive_activity);
     36 
     37         final View controlsView = findViewById(R.id.fullscreen_content_controls);
     38         final View contentView = findViewById(R.id.fullscreen_content);
     39 
     40         mDecorView = getWindow().getDecorView();
     41         mDecorView.setOnSystemUiVisibilityChangeListener(
     42                 new View.OnSystemUiVisibilityChangeListener() {
     43                     @Override
     44                     public void onSystemUiVisibilityChange(int flags) {
     45                         boolean visible = (flags & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0;
     46                         controlsView.animate()
     47                                 .alpha(visible ? 1 : 0)
     48                                 .translationY(visible ? 0 : controlsView.getHeight());
     49                     }
     50                 });
     51         contentView.setClickable(true);
     52         final GestureDetector clickDetector = new GestureDetector(this,
     53                 new GestureDetector.SimpleOnGestureListener() {
     54                     @Override
     55                     public boolean onSingleTapUp(MotionEvent e) {
     56                         boolean visible = (mDecorView.getSystemUiVisibility()
     57                                 & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0;
     58                         if (visible) {
     59                             hideSystemUI();
     60                         } else {
     61                             showSystemUI();
     62                         }
     63                         return true;
     64                     }
     65                 });
     66         contentView.setOnTouchListener(new View.OnTouchListener() {
     67             @Override
     68             public boolean onTouch(View view, MotionEvent motionEvent) {
     69                 return clickDetector.onTouchEvent(motionEvent);
     70             }
     71         });
     72 
     73         showSystemUI();
     74     }
     75 
     76     @Override
     77     public void onWindowFocusChanged(boolean hasFocus) {
     78         super.onWindowFocusChanged(hasFocus);
     79 
     80         // When the window loses focus (e.g. the action overflow is shown),
     81         // cancel any pending hide action. When the window gains focus,
     82         // hide the system UI.
     83         if (hasFocus) {
     84             delayedHide(INITIAL_HIDE_DELAY);
     85         } else {
     86             mHideHandler.removeMessages(0);
     87         }
     88     }
     89 
     90     private void hideSystemUI() {
     91         mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
     92                 | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
     93                 | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
     94                 | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
     95                 | View.SYSTEM_UI_FLAG_FULLSCREEN
     96                 | View.SYSTEM_UI_FLAG_LOW_PROFILE
     97                 | View.SYSTEM_UI_FLAG_IMMERSIVE);
     98     }
     99 
    100     private void showSystemUI() {
    101         mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
    102                 | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
    103                 | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
    104     }
    105 
    106     private final Handler mHideHandler = new Handler() {
    107         @Override
    108         public void handleMessage(Message msg) {
    109             hideSystemUI();
    110         }
    111     };
    112 
    113     private void delayedHide(int delayMillis) {
    114         mHideHandler.removeMessages(0);
    115         mHideHandler.sendEmptyMessageDelayed(0, delayMillis);
    116     }
    117 }
    118