获取电池电量和状态的Andr​​oid [英] Get battery level and state in Android

问题描述

我怎样才能电池电量和状态（插入，放电，充电，等等）？我研究了开发文档，我发现了一个BatteryManager类。但它不包含任何方法，只是常数。我如何甚至可以用它？

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

下面是一个code示例，说明如何获取电池信息：<一href="http://www.tutorialforandroid.com/2009/01/getting-battery-information-on-android.html">http://www.tutorialforandroid.com/2009/01/getting-battery-information-on-android.html

Here is a code sample that explains how to get battery information: http://www.tutorialforandroid.com/2009/01/getting-battery-information-on-android.html

要概括起来，一个广播接收器的 ACTION_BATTERY_CHANGED 的意图是建立动态的，因为它不能被通过舱单申报组件接受，只有通过显式注册的它与 Context.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, 0);
      batteryTxt.setText(String.valueOf(level) + "%");
    }
  };

  @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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