android - 电池充电

Question

如何检测充电器插入的时间和时长？ 我有扩展 BroadcastReceiver 并覆盖 onReceive 的类。我需要检查开始和结束充电以及持续时间，但我不知道从哪里开始。你能帮帮我吗？

Answer 1

I have class which extends BroadcastReceiver and override onReceive. I need to check start and end charging and duration time, but I don't know where to start.

首先，您需要创建正确的BroadcastReceiver，将监听电池充电变化。您可以通过 list 静态创建它:

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

然后您的 Java 类必须与其名称相匹配:

public class BatteryReceiver extends BroadcastReceiver {

   @Override
   public void onReceive(Context context, Intent intent) {
      // do your stuff
   }
}

或者您可以动态创建BoadcastReceiver，然后将其绑定(bind)到Service 或Activity 中(这取决于您的需要):

private void registerChargingReceiver() {
    if (intentFilter == null) {
        intentFilter = new IntentFilter();
        intentFilter.addAction(Intent.ACTION_POWER_CONNECTED);
        intentFilter.addAction(Intent.ACTION_POWER_DISCONNECTED);
    }
    if (receiver == null) {
        receiver = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent i) {

                // changer is connected
                if (i.getAction().equals(Intent.ACTION_POWER_CONNECTED)) {

                    // do proper actions
                }
                // changer is disconneted
                if (i.getAction().equals(Intent.ACTION_POWER_DISCONNECTED)) {

                    // do proper actions
                }
            }
        };
    }

    // registering receiver
    registerReceiver(receiver, intentFilter);
}

How can I detect when and how long the charger is plugged?

它可以通过更多可能的方式实现。当然，当充电器连接和断开时，你需要在某个地方保存时间，然后减去时间:

long chargingTime = endChargingTime - startChargingTime;

你可以使用 SharedPreferences节省时间的地方(伪代码):

if (intent.getAction().equals(Intent.ACTION_POWER_CONNECTED)) {

    // remove time when charger was diconnected (last before)
    prefs.edit().remove("chargingEndTime");

    // save time when charged is connected
    prefs.edit().putLong("chargingStartTime", System.currentTimeMillis());

    prefs.edit().commit();
}

if (intent.getAction().equals(Intent.ACTION_POWER_DISCONNECTED)) {

    // save time when charger is disconnected
    prefs.putLong("chargingEndTime", System.currentTimeMillis()).commit();
}

希望它能帮助解决您面临的问题。