1 page.title=Monitoring the Battery Level and Charging State 2 parent.title=Optimizing Battery Life 3 parent.link=index.html 4 5 trainingnavtop=true 6 next.title=Determining and Monitoring the Docking State and Type 7 next.link=docking-monitoring.html 8 9 @jd:body 10 11 <div id="tb-wrapper"> 12 <div id="tb"> 13 14 <h2> </h2> 15 <ol> 16 <li><a href="#DetermineChargeState"> </a></li> 17 <li><a href="#MonitorChargeState"> </a></li> 18 <li><a href="#CurrentLevel"> </a></li> 19 <li><a href="#MonitorLevel"> </a></li> 20 </ol> 21 22 <h2> </h2> 23 <ul> 24 <li><a href="{@docRoot}guide/components/intents-filters.html"> </a> 25 </ul> 26 27 </div> 28 </div> 29 30 <p> , , .</p> 31 32 <p> , . , , . , , .</p> 33 34 <p> , ( ).</p> 35 36 37 <h2 id="DetermineChargeState"> </h2> 38 39 <p> . {@link android.os.BatteryManager} {@link android.content.Intent}, .</p> 40 41 <p> , {@link android.content.BroadcastReceiver} . , {@code registerReceiver}, {@code null} , . {@link android.content.BroadcastReceiver}, , .</p> 42 43 <pre>IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); 44 Intent batteryStatus = context.registerReceiver(null, ifilter);</pre> 45 46 <p> , (USB ), :<p> 47 48 <pre>// Are we charging / charged? 49 int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1); 50 boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || 51 status == BatteryManager.BATTERY_STATUS_FULL; 52 53 // How are we charging? 54 int chargePlug = battery.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1); 55 boolean usbCharge = chargePlug == BATTERY_PLUGGED_USB; 56 boolean acCharge = chargePlug == BATTERY_PLUGGED_AC;</pre> 57 58 <p> , , . USB, , .</p> 59 60 61 <h2 id="MonitorChargeState"> </h2> 62 63 <p> , . , .</p> 64 65 <p>{@link android.os.BatteryManager} , . , . , , , . , {@link android.content.BroadcastReceiver} , {@link android.content.Intent#ACTION_POWER_CONNECTED} {@link android.content.Intent#ACTION_POWER_DISCONNECTED} .</p> 66 67 <pre><receiver android:name=".PowerConnectionReceiver"> 68 <intent-filter> 69 <action android:name="android.intent.action.ACTION_POWER_CONNECTED"/> 70 <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/> 71 </intent-filter> 72 </receiver></pre> 73 74 <p> {@link android.content.BroadcastReceiver} , .</p> 75 76 <pre>public class PowerConnectionReceiver extends BroadcastReceiver { 77 @Override 78 public void onReceive(Context context, Intent intent) { 79 int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1); 80 boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || 81 status == BatteryManager.BATTERY_STATUS_FULL; 82 83 int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1); 84 boolean usbCharge = chargePlug == BATTERY_PLUGGED_USB; 85 boolean acCharge = chargePlug == BATTERY_PLUGGED_AC; 86 } 87 }</pre> 88 89 90 <h2 id="CurrentLevel"> </h2> 91 92 <p> . , .</p> 93 94 <p>, , , :</p> 95 96 <pre>int level = battery.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); 97 int scale = battery.getIntExtra(BatteryManager.EXTRA_SCALE, -1); 98 99 float batteryPct = level / (float)scale;</pre> 100 101 102 <h2 id="MonitorLevel"> </h2> 103 104 <p> ,</p> 105 106 <p> , . , , .</p> 107 108 <p> , , . , . {@link android.content.Intent#ACTION_BATTERY_LOW} {@link android.content.Intent#ACTION_BATTERY_OKAY}.</p> 109 110 <pre><receiver android:name=".BatteryLevelReceiver"> 111 <intent-filter> 112 <action android:name="android.intent.action.ACTION_BATTERY_LOW"/> 113 <action android:name="android.intent.action.ACTION_BATTERY_OKAY"/> 114 </intent-filter> 115 </receiver></pre> 116 117 <p> , . , , , .</p> 118 119 <p> -. - .</p> 120 121
