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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 package com.android.settingslib.core.lifecycle;
     17 
     18 import static android.arch.lifecycle.Lifecycle.Event.ON_CREATE;
     19 import static android.arch.lifecycle.Lifecycle.Event.ON_DESTROY;
     20 import static android.arch.lifecycle.Lifecycle.Event.ON_PAUSE;
     21 import static android.arch.lifecycle.Lifecycle.Event.ON_RESUME;
     22 import static android.arch.lifecycle.Lifecycle.Event.ON_START;
     23 import static android.arch.lifecycle.Lifecycle.Event.ON_STOP;
     24 
     25 import android.app.DialogFragment;
     26 import android.arch.lifecycle.LifecycleOwner;
     27 import android.content.Context;
     28 import android.os.Bundle;
     29 import android.view.Menu;
     30 import android.view.MenuInflater;
     31 import android.view.MenuItem;
     32 
     33 /**
     34  * {@link DialogFragment} that has hooks to observe fragment lifecycle events.
     35  */
     36 public class ObservableDialogFragment extends DialogFragment implements LifecycleOwner {
     37 
     38     protected final Lifecycle mLifecycle = new Lifecycle(this);
     39 
     40     @Override
     41     public void onAttach(Context context) {
     42         super.onAttach(context);
     43         mLifecycle.onAttach(context);
     44     }
     45 
     46     @Override
     47     public void onCreate(Bundle savedInstanceState) {
     48         mLifecycle.onCreate(savedInstanceState);
     49         mLifecycle.handleLifecycleEvent(ON_CREATE);
     50         super.onCreate(savedInstanceState);
     51     }
     52 
     53     @Override
     54     public void onStart() {
     55         mLifecycle.handleLifecycleEvent(ON_START);
     56         super.onStart();
     57     }
     58 
     59     @Override
     60     public void onResume() {
     61         mLifecycle.handleLifecycleEvent(ON_RESUME);
     62         super.onResume();
     63     }
     64 
     65     @Override
     66     public void onPause() {
     67         mLifecycle.handleLifecycleEvent(ON_PAUSE);
     68         super.onPause();
     69     }
     70 
     71     @Override
     72     public void onStop() {
     73         mLifecycle.handleLifecycleEvent(ON_STOP);
     74         super.onStop();
     75     }
     76 
     77     @Override
     78     public void onDestroy() {
     79         mLifecycle.handleLifecycleEvent(ON_DESTROY);
     80         super.onDestroy();
     81     }
     82 
     83     @Override
     84     public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
     85         mLifecycle.onCreateOptionsMenu(menu, inflater);
     86         super.onCreateOptionsMenu(menu, inflater);
     87     }
     88 
     89     @Override
     90     public void onPrepareOptionsMenu(final Menu menu) {
     91         mLifecycle.onPrepareOptionsMenu(menu);
     92         super.onPrepareOptionsMenu(menu);
     93     }
     94 
     95     @Override
     96     public boolean onOptionsItemSelected(final MenuItem menuItem) {
     97         boolean lifecycleHandled = mLifecycle.onOptionsItemSelected(menuItem);
     98         if (!lifecycleHandled) {
     99             return super.onOptionsItemSelected(menuItem);
    100         }
    101         return lifecycleHandled;
    102     }
    103 
    104     @Override
    105     public Lifecycle getLifecycle() {
    106         return mLifecycle;
    107     }
    108 }
    109