在 Android 中获取电池电量和状态 [英] Get battery level and state in Android

问题描述

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，只包含常量.我什至如何使用它?

How can I get battery level and state (plugged in, discharging, charging, etc)? I researched the developer docs and I found a BatteryManager class. But it doesn't contain any methods, just constants. How do I even use it?

推荐答案

这里是一个代码示例，解释了如何获取电池信息.

Here is a code sample that explains how to get battery information.

总而言之，ACTION_BATTERY_CHANGED Intent 的广播接收器是动态设置的，因为它无法通过 manifest 中声明的组件接收，只能通过 Context 显式注册.registerReceiver().

To sum it up, a broadcast receiver for the ACTION_BATTERY_CHANGED intent is set up dynamically, because it can not be received through components declared in manifests, only by explicitly registering for it with Context.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));
  }
}

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