Home | History | Annotate | Download | only in activity-lifecycle 
      1 page.title=Activity
      2 page.tags=Activity
      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">Activity</a></li>
     15       <li><a href="#Resume">Activity</a></li>
     16     </ol>
     17 
     18     <h2></h2>
     19     <ul>
     20       <li><a href="{@docRoot}guide/components/activities.html">Activity</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>ActivityActivity<em></em>
     35 ActivityActivityActivity
     36 Activity
     37 </p>
     38 
     39 <p>Activity<em></em>
     40 </p>
     41 
     42 <p>Activity {@link android.app.Activity}  {@link
     43 android.app.Activity#onPause onPause()} ActivityActivity
     44 {@link android.app.Activity#onResume onResume()} 
     45 
     46 
     47 </p>
     48 
     49 <p class="note"><strong></strong>Activity {@link
     50 android.app.Activity#onPause()} Activity
     51 ActivityActivity
     52 </p>
     53 
     54 <img src="{@docRoot}images/training/basics/basic-lifecycle-paused.png" />
     55 <p class="img-caption"><strong> 1.</strong>ActivityActivity {@link android.app.Activity#onPause onPause()} Activity (1)
     56 
     57 ActivityActivity {@link android.app.Activity#onResume onResume()} (2)
     58 </p>
     59 
     60 
     61 <h2 id="Pause">Activity</h2>
     62 
     63 <p>Activity {@link android.app.Activity#onPause()} ActivityActivity
     64 
     65 
     66  {@link android.app.Activity#onPause()} </p>
     67 
     68 <ul>
     69   <li> CPU </li>
     70   <li>
     71 </li>
     72   <li> GPS Activity
     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><strong></strong> {@link android.app.Activity#onPause()} 
     95  {@link android.app.Activity#onPause()} {@link
     96 android.app.Activity#onPause()}  CPU Activity
     97 {@link android.app.Activity#onStop onStop()}
     98 
     99 
    100 
    101 </p>
    102 
    103 <p> {@link android.app.Activity#onPause
    104 onPause()} Activity
    105 </p>
    106 
    107 <p class="note"><strong></strong>Activity{@link
    108 android.app.Activity} Activity
    109 
    110 </p>
    111 
    112 
    113 
    114 <h2 id="Resume">Activity</h2>
    115 
    116 <p>Activity {@link
    117 android.app.Activity#onResume()} </p>
    118 
    119 <p>Activity
    120 {@link
    121 android.app.Activity#onResume()}  {@link
    122 android.app.Activity#onPause()} ActivityActivity
    123 
    124 </p>
    125 
    126 <p>{@link android.app.Activity#onResume()} 
    127  {@link android.app.Activity#onPause()} Activity
    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 
    143 
    144 
    145 
    146 
    147 
    148