1 /*
2  * Copyright (C) 2016 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.android.tv.settings;
18 
19 import android.app.Activity;
20 import android.app.Fragment;
21 import android.os.Bundle;
22 import android.support.annotation.Nullable;
23 import android.transition.Scene;
24 import android.transition.Slide;
25 import android.transition.Transition;
26 import android.transition.TransitionManager;
27 import android.util.Log;
28 import android.view.Gravity;
29 import android.view.ViewGroup;
30 import android.view.ViewTreeObserver;
31 
32 public abstract class TvSettingsActivity extends Activity {
33     private static final String TAG = "TvSettingsActivity";
34 
35     private static final String SETTINGS_FRAGMENT_TAG =
36             "com.android.tv.settings.MainSettings.SETTINGS_FRAGMENT";
37 
38     @Override
onCreate(@ullable Bundle savedInstanceState)39     protected void onCreate(@Nullable Bundle savedInstanceState) {
40         super.onCreate(savedInstanceState);
41         if (savedInstanceState == null) {
42 
43             final ViewGroup root = findViewById(android.R.id.content);
44             root.getViewTreeObserver().addOnPreDrawListener(
45                     new ViewTreeObserver.OnPreDrawListener() {
46                         @Override
47                         public boolean onPreDraw() {
48                             root.getViewTreeObserver().removeOnPreDrawListener(this);
49                             final Scene scene = new Scene(root);
50                             scene.setEnterAction(() -> {
51                                 if (getFragmentManager().isStateSaved()
52                                         || getFragmentManager().isDestroyed()) {
53                                     Log.d(TAG, "Got torn down before adding fragment");
54                                     return;
55                                 }
56                                 final Fragment fragment = createSettingsFragment();
57                                 if (fragment != null) {
58                                     getFragmentManager().beginTransaction()
59                                             .add(android.R.id.content, fragment,
60                                                     SETTINGS_FRAGMENT_TAG)
61                                             .commitNow();
62                                 }
63                             });
64 
65                             final Slide slide = new Slide(Gravity.END);
66                             slide.setSlideFraction(
67                                     getResources().getDimension(R.dimen.lb_settings_pane_width)
68                                             / root.getWidth());
69                             TransitionManager.go(scene, slide);
70 
71                             // Skip the current draw, there's nothing in it
72                             return false;
73                         }
74                     });
75         }
76     }
77 
78     @Override
finish()79     public void finish() {
80         final Fragment fragment = getFragmentManager().findFragmentByTag(SETTINGS_FRAGMENT_TAG);
81         if (isResumed() && fragment != null) {
82             final ViewGroup root = findViewById(android.R.id.content);
83             final Scene scene = new Scene(root);
84             scene.setEnterAction(() -> getFragmentManager().beginTransaction()
85                     .remove(fragment)
86                     .commitNow());
87             final Slide slide = new Slide(Gravity.END);
88             slide.setSlideFraction(
89                     getResources().getDimension(R.dimen.lb_settings_pane_width) / root.getWidth());
90             slide.addListener(new Transition.TransitionListener() {
91                 @Override
92                 public void onTransitionStart(Transition transition) {
93                     getWindow().setDimAmount(0);
94                 }
95 
96                 @Override
97                 public void onTransitionEnd(Transition transition) {
98                     transition.removeListener(this);
99                     TvSettingsActivity.super.finish();
100                 }
101 
102                 @Override
103                 public void onTransitionCancel(Transition transition) {
104                 }
105 
106                 @Override
107                 public void onTransitionPause(Transition transition) {
108                 }
109 
110                 @Override
111                 public void onTransitionResume(Transition transition) {
112                 }
113             });
114             TransitionManager.go(scene, slide);
115         } else {
116             super.finish();
117         }
118     }
119 
createSettingsFragment()120     protected abstract Fragment createSettingsFragment();
121 }
122