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="#Pause"> </a></li>
     15       <li><a href="#Resume"> </a></li>
     16     </ol>
     17     
     18     <h2> </h2>
     19     <ul>
     20       <li><a href="{@docRoot}guide/components/activities.html"></a>
     21       </li>
     22     </ul>
     23 
     24 <h2></h2>
     25 
     26 <div class="download-box">
     27  <a href="http://developer.android.com/shareables/training/ActivityLifecycle.zip" class="button"> </a>
     28  <p class="filename">ActivityLifecycle.zip</p>
     29 </div>
     30 
     31   </div>
     32 </div>
     33 
     34 <p>      
     35      <em></em>  .   ,     
     36  ,    . 
     37           .</p>
     38 
     39 <p>     , <em></em>  ( 
     40   ).</p>
     41 
     42 <p>     {@link android.app.Activity}  {@link
     43 android.app.Activity#onPause onPause()}  .  
     44           ,       
     45   . 
     46     ,    {@link android.app.Activity#onResume onResume()} 
     47 .</p>
     48 
     49 <p class="note"><strong>:</strong>  {@link
     50 android.app.Activity#onPause()}    ,  
     51   ,         .       
     52   .</p>
     53 
     54 <img src="{@docRoot}images/training/basics/basic-lifecycle-paused.png" />
     55 <p class="img-caption"><strong> 1.</strong> 
     56    ,  {@link android.app.Activity#onPause onPause()}    
     57  (1).       ,
     58  {@link android.app.Activity#onResume onResume()} (2).</p>
     59 
     60 
     61 <h2 id="Pause"> </h2>
     62       
     63 <p>   {@link android.app.Activity#onPause()} , 
     64         ,
     65           .      
     66 {@link android.app.Activity#onPause()}   .</p>
     67 
     68 <ul>
     69   <li>  CPU        </li>
     70   <li>    . ,   
     71        (:  ).</li>
     72   <li>    , GPS
     73               
     74      </li>
     75 </ul>
     76 
     77 <p>   {@link android.hardware.Camera}  
     78 {@link android.app.Activity#onPause()}       .</p>
     79 
     80 <pre>
     81 &#64;Override
     82 public void onPause() {
     83     super.onPause();  // Always call the superclass method first
     84 
     85     // Release the Camera because we don't need it when paused
     86     // and other activities might need to use it.
     87     if (mCamera != null) {
     88         mCamera.release()
     89         mCamera = null;
     90     }
     91 }
     92 </pre>
     93 
     94 <p>     
     95    {@link android.app.Activity#onPause()}     <strong> </strong>. 
     96          {@link android.app.Activity#onPause()}
     97        .
     98     CPU    {@link
     99 android.app.Activity#onPause()}    .        
    100     ( ,     {@link android.app.Activity#onStop onStop()}
    101   ).</p>
    102 
    103 <p>     
    104      {@link android.app.Activity#onPause
    105 onPause()}         .</p>
    106 
    107 <p class="note"><strong>:</strong>   {@link
    108 android.app.Activity}    ,    .
    109       
    110      .</p>
    111 
    112 
    113 
    114 <h2 id="Resume"> </h2>
    115 
    116 <p>    ,  {@link
    117 android.app.Activity#onResume()}  .</p>
    118 
    119 <p>   
    120            .  , {@link
    121 android.app.Activity#onResume()}  {@link
    122 android.app.Activity#onPause()}    , 
    123          (:        
    124    ).</p>
    125 
    126 <p> {@link android.app.Activity#onResume()}   
    127 {@link android.app.Activity#onPause()}   .      
    128   .</p>
    129 
    130 <pre>
    131 &#64;Override
    132 public void onResume() {
    133     super.onResume();  // Always call the superclass method first
    134 
    135     // Get the Camera instance as the activity achieves full user focus
    136     if (mCamera == null) {
    137         initializeCamera(); // Local method to handle camera init
    138     }
    139 }
    140 </pre>
    141 
    142 
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    148