Home | History | Annotate | Download | only in activity-lifecycle 
      1 page.title= 
      2 page.tags=  
      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>        
     32   {@link android.app.Activity#finish()}.     ,
     33          ,         
     34           .</p>
     35 
     36 <p>       <em></em>  
     37 ,  ,   {@link android.app.Activity}  ,
     38     ,     .    
     39       (      ),  
     40 {@link android.app.Activity}  ,     ,  
     41    ,     ,  
     42  ,       .  , 
     43     ,  " "    
     44  "-",    {@link android.os.Bundle}.</p>
     45 
     46 <p class="caution"><strong>!</strong>        ,
     47    .         
     48  ,        
     49    (  ).</p>
     50 
     51 <p>      {@link android.os.Bundle}   
     52    {@link android.view.View}    (,   ,
     53    {@link android.widget.EditText}).  ,      
     54  ,     ,
     55           .  
     56      ,    ,  ,
     57     .</p>
     58 
     59 <p class="note"><strong>.</strong>   Android   
     60  , <strong>     </strong>,  
     61 <a href="{@docRoot}reference/android/view/View.html#attr_android:id">{@code
     62 android:id}</a>.</p>
     63 
     64 <p>      , 
     65     {@link android.app.Activity#onSaveInstanceState onSaveInstanceState()}.
     66    ,    ,
     67     {@link android.os.Bundle},    
     68 ,     . 
     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        ,   
     80 ,   (1),  {@link android.app.Activity#onCreate onCreate()}
     81 (2)  {@link android.app.Activity#onRestoreInstanceState onRestoreInstanceState()}
     82 (3).</p>
     83 
     84 
     85 
     86 <h2 id="SaveState">  </h2>
     87 
     88 <p>   ,    {@link android.app.Activity#onSaveInstanceState
     89 onSaveInstanceState()},           
     90 "-".           
     91  ,     {@link android.widget.EditText}   
     92  {@link android.widget.ListView}.</p>
     93 
     94 <p>      
     95   {@link android.app.Activity#onSaveInstanceState onSaveInstanceState()}  
     96   {@link android.os.Bundle}  "-". :</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         ,     ,
    130  {@link android.os.Bundle}   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
    156 android.app.Activity#onRestoreInstanceState onRestoreInstanceState()},   
    157   {@link android.app.Activity#onStart()}.   {@link
    158 android.app.Activity#onRestoreInstanceState onRestoreInstanceState()}     
    159  ,      ,   {@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#onRestoreInstanceState onRestoreInstanceState()}     ,  
    174       .</p>
    175 
    176 <p>       
    177      (   )     <a href="{@docRoot}guide/topics/resources/runtime-changes.html">    </a>.</p>
    178 
    179