Android电池电量监听的示例代码

监听电池状态只需要接收Intent.ACTION_BATTERY_CHANGED的广播即可，当电池状态发生变化时会发出广播。

1.运行状态如下图：

1.充电中的状态

2.未充电时的状态

2.实现代码如下，各个状态通过名字就很容易知道意思，BatteryManager类中定义了电池状态。

public class MainActivity extends Activity {
  private static final String TAG = "MainActivity"; 

  private TextView mTvVoltage;
  private TextView mTvTemperature;
  private TextView mTvLevel;
  private TextView mTvStatus;
  private TextView mTvHealth;
  private TextView mTvTechnology; 

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main); 

    mTvVoltage = (TextView)findViewById(R.id.tv_voltage);
    mTvTemperature = (TextView)findViewById(R.id.tv_temperature);
    mTvLevel = (TextView)findViewById(R.id.tv_level);
    mTvStatus = (TextView)findViewById(R.id.tv_status);
    mTvHealth = (TextView)findViewById(R.id.tv_health);
    mTvTechnology = (TextView)findViewById(R.id.tv_technology); 

    this.registerReceiver(this.mBatteryReceiver, new IntentFilter(
        Intent.ACTION_BATTERY_CHANGED));
  } 

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  } 

  private BroadcastReceiver mBatteryReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context arg0, Intent arg1) {
      int voltage=arg1.getIntExtra(BatteryManager.EXTRA_VOLTAGE, 0);
      mTvVoltage.setText("电压：" + voltage / 1000 + "." + voltage % 1000 + "V"); 

      int temperature=arg1.getIntExtra(BatteryManager.EXTRA_TEMPERATURE,0);
      mTvTemperature.setText("温度：" + temperature / 10 + "." + temperature % 10 + "℃");
      if (temperature >= 300) {
        mTvTemperature.setTextColor(Color.RED);
      } else {
        mTvTemperature.setTextColor(Color.BLUE);
      } 

      int level=arg1.getIntExtra(BatteryManager.EXTRA_LEVEL,0);
      int scale=arg1.getIntExtra(BatteryManager.EXTRA_SCALE,0);
      int levelPercent = (int)(((float)level / scale) * 100);
      mTvLevel.setText("电量：" + levelPercent + "%");
      if (level <= 10) {
        mTvLevel.setTextColor(Color.RED);
      } else {
        mTvLevel.setTextColor(Color.BLUE);
      } 

      int status = arg1.getIntExtra(BatteryManager.EXTRA_STATUS, BatteryManager.BATTERY_STATUS_UNKNOWN);
      String strStatus = "未知状态";;
      switch (status) {
      case BatteryManager.BATTERY_STATUS_CHARGING:
        strStatus = "充电中……";
        break;
      case BatteryManager.BATTERY_STATUS_DISCHARGING:
        strStatus = "放电中……";
        break;
      case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
        strStatus = "未充电";
        break;
      case BatteryManager.BATTERY_STATUS_FULL:
        strStatus = "充电完成";
        break;
      }
      mTvStatus.setText("状态：" + strStatus); 

      int health = arg1.getIntExtra(BatteryManager.EXTRA_HEALTH, BatteryManager.BATTERY_HEALTH_UNKNOWN);
      String strHealth = "未知 :(";;
      switch (status) {
      case BatteryManager.BATTERY_HEALTH_GOOD:
        strHealth = "好 :)";
        break;
      case BatteryManager.BATTERY_HEALTH_OVERHEAT:
        strHealth = "过热！";
        break;
      case BatteryManager.BATTERY_HEALTH_DEAD: // 未充电时就会显示此状态，这是什么鬼？
        strHealth = "良好";
        break;
      case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
        strHealth = "电压过高！";
        break;
      case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
        strHealth = "未知 :(";
        break;
      case BatteryManager.BATTERY_HEALTH_COLD:
        strHealth = "过冷！";
        break;
      }
      mTvHealth.setText("健康状况：" + strHealth); 

      String technology = arg1.getStringExtra(BatteryManager.EXTRA_TECHNOLOGY);
      mTvTechnology.setText("电池技术：" + technology);
    }
  };
}

3.Layout布局如下，很简单只有几个TextView：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context=".MainActivity" > 

  <TextView android:id="@+id/tv_battery_status"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textColor="#0000FF"
       android:textStyle="bold"
       android:text="@string/battery_status" /> 

  <LinearLayout android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical"
         android:layout_below="@id/tv_battery_status" >
    <TextView android:id="@+id/tv_voltage"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />
    <TextView android:id="@+id/tv_temperature"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />
    <TextView android:id="@+id/tv_level"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />
    <TextView android:id="@+id/tv_status"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />
    <TextView android:id="@+id/tv_health"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />
    <TextView android:id="@+id/tv_technology"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />
    </LinearLayout>
</RelativeLayout>

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