获取Android设备电池电量状态

自己在网上搜索了一下，将其总结如下：
Android开发者可以利用BroadcastReceiver机制，获取电池电量变化的ACTION_BATTERY_CHANGED intent，进而获取当前android设备的电池状态。具体操作步骤： 1. 创建一个监听ACTION_BATTERY_CHANGED事件的intentFilter。 2. 创建一个BroadcastReceiver对象，该对象可以接收broadcast intent。 3. 注册BroadcastReceiver对象来监听ACTION_BATTERY_CHANGED事件。 4. 在BroadcastReceiver对象中，重写onReceive方法，在onReceive方法的传入参数intent里获取需要的电池状态信息。 5. 在生命周期结束时，取消step4中的注册。
示例代码： Java文件
public class BatteryMonitorActivity extends Activity{

private TextViewbatterLevel;
private BroadcastReceiverbatteryLevelRcvr;
private IntentFilterbatteryLevelFilter;

@Override
public void onCreate(BundlesavedInstanceState){
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
batterLevel = (TextView)findViewById(R.id.batteryLevel);
monitorBatteryState();
}

@Override
protected void onDestroy(){
super .onDestroy();
unregisterReceiver(batteryLevelRcvr);
}

private void monitorBatteryState(){
batteryLevelRcvr = new BroadcastReceiver(){

public void onReceive(Contextcontext,Intentintent){
StringBuildersb = new StringBuilder();
int rawlevel = intent.getIntExtra( " level " , - 1 );
int scale = intent.getIntExtra( " scale " , - 1 );
int status = intent.getIntExtra( " status " , - 1 );
int health = intent.getIntExtra( " health " , - 1 );
int level = - 1 ; // percentage,or-1forunknown
if (rawlevel >= 0 && scale > 0 ){
level = (rawlevel * 100 ) / scale;
}
sb.append( " Thephone " );
if (BatteryManager.BATTERY_HEALTH_OVERHEAT == health){
sb.append( " 'sbatteryfeelsveryhot! " );
} else {
switch (status){
case BatteryManager.BATTERY_STATUS_UNKNOWN:
sb.append( " nobattery. " );
break ;
case BatteryManager.BATTERY_STATUS_CHARGING:
sb.append( " 'sbattery " );
if (level <= 33 )
sb.append( " ischarging,batterylevelislow " + " [ " + level + " ] " );
else if (level <= 84 )
sb.append( " ischarging. " + " [ " + level + " ] " );
else
sb.append( " willbefullycharged. " );
break ;
case BatteryManager.BATTERY_STATUS_DISCHARGING:
case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
if (level == 0 )
sb.append( " needschargingrightaway. " );
else if (level > 0 && level <= 33 )
sb.append( " isaboutreadytoberecharged,batterylevelislow " + " [ " + level + " ] " );
else
sb.append( " 'sbatterylevelis " + " [ " + level + " ] " );
break ;
case BatteryManager.BATTERY_STATUS_FULL:
sb.append( " isfullycharged. " );
break ;
default :
sb.append( " 'sbatteryisindescribable! " );
break ;
}
}
sb.append( ' ' );
batterLevel.setText(sb.toString());
}
};
batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryLevelRcvr,batteryLevelFilter);
}
} 布局文件
<? xmlversion = " 1.0 " encoding = " utf-8 " ?>
< LinearLayoutxmlns:android = " http://schemas.android.com/apk/res/android "
android:layout_width = " fill_parent "
android:layout_height = " fill_parent "
android:orientation = " vertical " >
< TextView
android:id = " @+id/batteryLevel "
android:layout_width = " fill_parent "
android:layout_height = " fill_parent "
android:gravity = " center_vertical|center_horizontal "
android:textSize = " 50dip " >
</ TextView >
</ LinearLayout >

由于移动设备电池电量的局限，使得电池电量的控制成为评价一个移动应用好坏的重要标准。个人认为一个电量控制较好的应用，应该是一方面合理安排耗电操作，并且follow android开发中那些省电的best practice，以保证移动设备的用电效率，另一方面，应该识别当前电池电量状态进行耗电操作调整，例如，当电池电量较低时，减小耗电操作的次数，以提供友好的用电方式。

获取Android设备电池电量状态

获取Android设备电池电量状态

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