Android 监听电量的状态

监控手机电量的变化和充电状态

在BatteryManager中有一个粘性广播，不需要BroadcastReceiver作为接收器，在注册时将传入null

  IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
  Intent intent = context.registerReceiver(null, filter);

从intent中就可以获取相关的电池的状态

当前电量

  int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
  int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1); //电量的刻度

当前的充电状态

  int status = intent.getIntExtra(BatteryManager.EXTRA_SCALE, BatteryManager.BATTERY_STATUS_UNKNOWN);

充电状态值：

状态	描述
int BATTERY_STATUS_CHARGING = 2	充电中
int BATTERY_STATUS_DISCHARGING = 3	放电中
int BATTERY_STATUS_NOT_CHARGING = 4	未充电
int BATTERY_STATUS_FULL = 5	已充满
int BATTERY_STATUS_UNKNOWN = 1	状态未知

当前的充电方式

  int plug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);

充电的方式

方式	描述
int BATTERY_PLUGGED_AC = 1	使用充电器充电
int BATTERY_PLUGGED_USB = 2	使用USB充电
int BATTERY_PLUGGED_WIRELESS = 4	使用无线方式充电

监听充电状态的变化

可以通过注册静态广播，监听 Intent.ACTION_POWER_CONNECTED Intent.ACTION_POWER_DISCONNECTED

  <receiver
    android:name=".PowerReceiver">
    <intent-filter>
        <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
        <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
    </intent-filter>
  </receiver>

  public class PowerReceiver extends BroadcastReceiver{

    private static final String TAG = PowerReceiver.class.getSimpleName();

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if(action.equals(Intent.ACTION_POWER_CONNECTED)){
            Log.d(TAG, "power connected");

        }else if(action.equals(Intent.ACTION_POWER_DISCONNECTED)){
            Log.e(TAG, "power disconnected");

        }
    }
  }

确定基座的状态变化和类型

注册粘性广播ACTION_DOCK_EVENT，来判断是插入底座，以及底座的类型

  IntentFilter ifilter = new IntentFilter(Intent.ACTION_DOCK_EVENT);
  Intent dockStatus = context.registerReceiver(null, ifilter);

  int dockState = dockStatus.getIntExtra(EXTRA_DOCK_STATE, -1); //底座类型
  boolean isDocked = dockState != Intent.EXTRA_DOCK_STATE_UNDOCKED; //是否插入了底座

底座的类型：

底座类型	描述
int EXTRA_DOCK_STATE_CAR = 2	车载底座
int EXTRA_DOCK_STATE_DESK = 1	桌面底座
int EXTRA_DOCK_STATE_LE_DESK = 3	低端（模拟）桌面基座 API >= 11
int EXTRA_DOCK_STATE_HE_DESK = 4	高端（数字）桌面基座 API >= 11