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      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.settingslib.core.lifecycle;
     18 
     19 import static android.arch.lifecycle.Lifecycle.Event.ON_CREATE;
     20 import static android.arch.lifecycle.Lifecycle.Event.ON_DESTROY;
     21 import static android.arch.lifecycle.Lifecycle.Event.ON_PAUSE;
     22 import static android.arch.lifecycle.Lifecycle.Event.ON_RESUME;
     23 import static android.arch.lifecycle.Lifecycle.Event.ON_START;
     24 import static android.arch.lifecycle.Lifecycle.Event.ON_STOP;
     25 
     26 import android.annotation.CallSuper;
     27 import android.app.Fragment;
     28 import android.arch.lifecycle.LifecycleOwner;
     29 import android.content.Context;
     30 import android.os.Bundle;
     31 import android.view.Menu;
     32 import android.view.MenuInflater;
     33 import android.view.MenuItem;
     34 
     35 public class ObservableFragment extends Fragment implements LifecycleOwner {
     36 
     37     private final Lifecycle mLifecycle = new Lifecycle(this);
     38 
     39     public Lifecycle getLifecycle() {
     40         return mLifecycle;
     41     }
     42 
     43     @CallSuper
     44     @Override
     45     public void onAttach(Context context) {
     46         super.onAttach(context);
     47         mLifecycle.onAttach(context);
     48     }
     49 
     50     @CallSuper
     51     @Override
     52     public void onCreate(Bundle savedInstanceState) {
     53         mLifecycle.onCreate(savedInstanceState);
     54         mLifecycle.handleLifecycleEvent(ON_CREATE);
     55         super.onCreate(savedInstanceState);
     56     }
     57 
     58     @CallSuper
     59     @Override
     60     public void onSaveInstanceState(Bundle outState) {
     61         super.onSaveInstanceState(outState);
     62         mLifecycle.onSaveInstanceState(outState);
     63     }
     64 
     65     @CallSuper
     66     @Override
     67     public void onStart() {
     68         mLifecycle.handleLifecycleEvent(ON_START);
     69         super.onStart();
     70     }
     71 
     72     @CallSuper
     73     @Override
     74     public void onResume() {
     75         mLifecycle.handleLifecycleEvent(ON_RESUME);
     76         super.onResume();
     77     }
     78 
     79     @CallSuper
     80     @Override
     81     public void onPause() {
     82         mLifecycle.handleLifecycleEvent(ON_PAUSE);
     83         super.onPause();
     84     }
     85 
     86     @CallSuper
     87     @Override
     88     public void onStop() {
     89         mLifecycle.handleLifecycleEvent(ON_STOP);
     90         super.onStop();
     91     }
     92 
     93     @CallSuper
     94     @Override
     95     public void onDestroy() {
     96         mLifecycle.handleLifecycleEvent(ON_DESTROY);
     97         super.onDestroy();
     98     }
     99 
    100     @CallSuper
    101     @Override
    102     public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
    103         mLifecycle.onCreateOptionsMenu(menu, inflater);
    104         super.onCreateOptionsMenu(menu, inflater);
    105     }
    106 
    107     @CallSuper
    108     @Override
    109     public void onPrepareOptionsMenu(final Menu menu) {
    110         mLifecycle.onPrepareOptionsMenu(menu);
    111         super.onPrepareOptionsMenu(menu);
    112     }
    113 
    114     @CallSuper
    115     @Override
    116     public boolean onOptionsItemSelected(final MenuItem menuItem) {
    117         boolean lifecycleHandled = mLifecycle.onOptionsItemSelected(menuItem);
    118         if (!lifecycleHandled) {
    119             return super.onOptionsItemSelected(menuItem);
    120         }
    121         return lifecycleHandled;
    122     }
    123 }
    124