获取Android设备电池电量状态

zhangqian — Wed, 04 Jan 2012 09:08:00 GMT

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 TextView batterLevel;
    private BroadcastReceiver batteryLevelRcvr;
    private IntentFilter batteryLevelFilter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        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(Context context, Intent intent) {
                StringBuilder sb = 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 -1 for unknown
                if (rawlevel >= 0 && scale > 0) {
                    level = (rawlevel * 100) / scale;
                }
                sb.append("The phone");
                if (BatteryManager.BATTERY_HEALTH_OVERHEAT == health) {
                    sb.append("'s battery feels very hot!");
                } else {
                    switch (status) {
                        case BatteryManager.BATTERY_STATUS_UNKNOWN:
                            sb.append("no battery.");
                            break;
                        case BatteryManager.BATTERY_STATUS_CHARGING:
                            sb.append("'s battery");
                            if (level <= 33)
                                sb.append(" is charging, battery level is low" + "[" + level + "]");
                            else if (level <= 84)
                                sb.append(" is charging." + "[" + level + "]");
                            else
                                sb.append(" will be fully charged.");
                            break;
                        case BatteryManager.BATTERY_STATUS_DISCHARGING:
                        case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
                            if (level == 0)
                                sb.append(" needs charging right away.");
                            else if (level > 0 && level <= 33)
                                sb.append(" is about ready to be recharged, battery level is low"+ "[" + level + "]");
                            else
                                sb.append("'s battery level is" + "[" + level + "]");
                            break;
                        case BatteryManager.BATTERY_STATUS_FULL:
                            sb.append(" is fully charged.");
                            break;
                        default:
                            sb.append("'s battery is indescribable!");
                            break;
                    }
                }
                sb.append(' ');
                batterLevel.setText(sb.toString());
            }
        };
        batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(batteryLevelRcvr, batteryLevelFilter);
    }
}

布局文件

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns: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。

zhangqian 2012-01-04 17:08 发表评论

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获取Android设备电池电量状态