Home | History | Annotate | Download | only in activity-lifecycle 
      1 page.title= 
      2 page.tags=activity lifecycle
      3 helpoutsWidget=true
      4 
      5 trainingnavtop=true
      6 
      7 @jd:body
      8 
      9 <div id="tb-wrapper">
     10   <div id="tb">
     11     
     12     <h2>   </h2>
     13     <ol>
     14       <li><a href="#SaveState">  </a></li>
     15       <li><a href="#RestoreState">  </a></li>
     16     </ol>
     17     
     18     <h2> </h2>
     19     <ul>
     20       <li><a href="{@docRoot}training/basics/supporting-devices/screens.html">
     21  </a></li>
     22       <li><a href="{@docRoot}guide/topics/resources/runtime-changes.html">  </a></li>
     23       <li><a href="{@docRoot}guide/components/activities.html"></a>
     24       </li>
     25     </ul>
     26 
     27   </div>
     28 </div>
     29 
     30 <p>         .
     31    <em></em>    {@link android.app.Activity#finish()} 
     32     .  
     33      ,     
     34                .</p>
     35 
     36 <p> <em></em>   
     37    , {@link android.app.Activity}       . 
     38         .          
     39   , 
     40 {@link android.app.Activity}       .  
     41     ,     
     42        . 
     43        " " ,  {@link android.os.Bundle}  
     44 -  .</p>
     45 
     46 <p class="caution"><strong>:</strong>    
     47   .    
     48     .     ,     
     49     .</p>
     50 
     51 <p>  {@link android.os.Bundle}       {@link android.view.View}  
     52  (: {@link android.widget.EditText} 
     53    ).    
     54  ,  
     55       . 
     56    
     57             .</p>
     58 
     59 <p class="note"><strong>:</strong> Android  
     60    
     61 <a href="{@docRoot}reference/android/view/View.html#attr_android:id">{@code
     62 android:id}</a>   <strong> ID    </strong>.</p>
     63 
     64 <p>     
     65 {@link android.app.Activity#onSaveInstanceState onSaveInstanceState()}    .
     66        ,
     67      
     68 {@link android.os.Bundle}  . 
     69      ,  {@link
     70 android.os.Bundle}  {@link android.app.Activity#onRestoreInstanceState
     71 onRestoreInstanceState()}  {@link android.app.Activity#onCreate onCreate()}
     72   .</p>
     73 
     74 <img src="{@docRoot}images/training/basics/basic-lifecycle-savestate.png" />
     75 <p class="img-caption"><strong> 2.</strong>      
     76 {@link android.app.Activity#onSaveInstanceState onSaveInstanceState()}(1) .
     77  {@link android.app.Activity} 
     78           .
     79       ,  {@link android.app.Activity#onCreate onCreate()} (2)
     80  {@link android.app.Activity#onRestoreInstanceState onRestoreInstanceState()} (3)
     81  (1)  
     82  .</p>
     83 
     84 
     85 
     86 <h2 id="SaveState">  </h2>
     87 
     88 <p>      {@link android.app.Activity#onSaveInstanceState
     89 onSaveInstanceState()} .    -
     90        .    {@link android.widget.EditText}     {@link android.widget.ListView} 
     91   
     92      .</p>
     93 
     94 <p>      {@link android.app.Activity#onSaveInstanceState onSaveInstanceState()}
     95   {@link android.os.Bundle} 
     96 -   .    .</p>
     97 
     98 <pre>
     99 static final String STATE_SCORE = "playerScore";
    100 static final String STATE_LEVEL = "playerLevel";
    101 ...
    102 
    103 &#64;Override
    104 public void onSaveInstanceState(Bundle savedInstanceState) {
    105     // Save the user's current game state
    106     savedInstanceState.putInt(STATE_SCORE, mCurrentScore);
    107     savedInstanceState.putInt(STATE_LEVEL, mCurrentLevel);
    108     
    109     // Always call the superclass so it can save the view hierarchy state
    110     super.onSaveInstanceState(savedInstanceState);
    111 }
    112 </pre>
    113 
    114 <p class="caution"><strong>:</strong>  {@link
    115 android.app.Activity#onSaveInstanceState onSaveInstanceState()}     
    116       .</p>
    117 
    118 
    119 
    120 <h2 id="RestoreState">  </h2>
    121 
    122 <p>    ,  
    123  {@link android.os.Bundle} 
    124    . {@link android.app.Activity#onCreate onCreate()}  {@link
    125 android.app.Activity#onRestoreInstanceState onRestoreInstanceState()}        
    126  {@link android.os.Bundle} .</p>
    127 
    128 <p>{@link android.app.Activity#onCreate onCreate()} 
    129     ,     ,     {@link android.os.Bundle} null
    130   . null ,
    131     
    132     .</p>
    133 
    134 <p> {@link android.app.Activity#onCreate
    135 onCreate()}        .</p>
    136 
    137 <pre>
    138 &#64;Override
    139 protected void onCreate(Bundle savedInstanceState) {
    140     super.onCreate(savedInstanceState); // Always call the superclass first
    141    
    142     // Check whether we're recreating a previously destroyed instance
    143     if (savedInstanceState != null) {
    144         // Restore value of members from saved state
    145         mCurrentScore = savedInstanceState.getInt(STATE_SCORE);
    146         mCurrentLevel = savedInstanceState.getInt(STATE_LEVEL);
    147     } else {
    148         // Probably initialize members with default values for a new instance
    149     }
    150     ...
    151 }
    152 </pre>
    153 
    154 <p>{@link android.app.Activity#onCreate onCreate()}   
    155 ,  {@link android.app.Activity#onStart()}  
    156  {@link
    157 android.app.Activity#onRestoreInstanceState onRestoreInstanceState()}    .   
    158    {@link
    159 android.app.Activity#onRestoreInstanceState onRestoreInstanceState()} .  {@link android.os.Bundle} null   .</p>
    160         
    161 <pre>
    162 public void onRestoreInstanceState(Bundle savedInstanceState) {
    163     // Always call the superclass so it can restore the view hierarchy
    164     super.onRestoreInstanceState(savedInstanceState);
    165    
    166     // Restore state members from saved instance
    167     mCurrentScore = savedInstanceState.getInt(STATE_SCORE);
    168     mCurrentLevel = savedInstanceState.getInt(STATE_LEVEL);
    169 }
    170 </pre>
    171 
    172 <p class="caution"><strong>:</strong>  {@link
    173 android.app.Activity#onSaveInstanceState onSaveInstanceState()}         
    174    .</p>
    175 
    176 <p>
    177         <a href="{@docRoot}guide/topics/resources/runtime-changes.html">  </a> .</p>
    178 
    179