java - 在 Android 中获取电池电量和状态

Question

如何获取电池电量和状态(插入、放电、充电等)？我研究了开发人员文档，发现了一个 BatteryManager 类。但它不包含任何方法，只是常量。我该如何使用它？

Answer 1

Tutorial For Android有一个解释如何获取电池信息的代码示例。

总结一下，ACTION_BATTERY_CHANGED Intent 的广播接收器是动态设置的，因为无法通过manifest中声明的组件接收，只能通过Context显式注册.registerReceiver().

public class Main extends Activity {
  private TextView batteryTxt;
  private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context ctxt, Intent intent) {
      int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
      int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
      float batteryPct = level * 100 / (float)scale;
      batteryTxt.setText(String.valueOf(batteryPct) + "%");
    }
  };

  @Override
  public void onCreate(Bundle b) {
    super.onCreate(b);
    setContentView(R.layout.main);
    batteryTxt = (TextView) this.findViewById(R.id.batteryTxt);
    this.registerReceiver(this.mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
  }
}