java Android WorkManager在手机充满电时运行任务

Question

我有一个项目，我想在电池充满电时在WorkManager中运行一个任务。我几乎到处找，但找不到任何解决办法

@NonNull
@Override
public Result doWork() {

    //I want to run this task when battery is full.

    if(BatteryManager.BATTERY_STATUS_CHARGING==100) {
          showNotification();
    }

    return Result.success();
}

以及启动WorkManager的代码片段：

private void startWorkManager() {


    Constraints constraints = new Constraints.Builder()
        .setRequiresBatteryNotLow(true)
        .setRequiresCharging(true)
        .build();

    PeriodicWorkRequest periodicWorkRequest= new
            PeriodicWorkRequest.Builder(NotificationWork.class 
    ,15,TimeUnit.MINUTES)
            .setConstraints(constraints)
            .build();

    WorkManager.getInstance().enqueue(periodicWorkRequest);
}

更新承包商

公共通知工作（@NonNull上下文，@NonNull WorkerParameters workerParams）{ 超级（上下文、工作参数）； 这语境=语境

}

public double batteryLevel(Context context){

    Intent batteryIntent = context.getApplicationContext().registerReceiver(null,
            new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    int rawlevel = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
    double scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
    double level = -1;
    if (rawlevel >= 0 && scale > 0) {
        level = rawlevel / scale;
    }
    return level;    //This will return the value in range of 0.0-1.0
}


@NonNull
@Override
public Result doWork() {

    if (batteryLevel(context) == 1.0) {  //1.0 means 100%

      showNotification();

        return Result.success();
    } else {
          return Result.retry();
    }
}

Answer 1

首先，在worker类中，创建一个batteryLevel(Context context)函数来获取电池电量

public double batteryLevel(Context context){

    Intent batteryIntent = context.getApplicationContext().registerReceiver(null,
                new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    int rawlevel = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
    double scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
    double level = -1;
    if (rawlevel >= 0 && scale > 0) {
        level = rawlevel / scale;
    }
    return level;    //This will return the value in range of 0.0-1.0
}

然后在doWork()方法中，检查电池电量，如果是100%：

if (batteryLevel(context) == 1.0){  //1.0 means 100%
    //Do your stuff
    return Result.success()
}else{
    return Result.retry()
}

更新 创建类级上下文对象

Context context;

使用以下参数初始化构造函数

public NotificationWork(@NonNull Context context, @NonNull WorkerParameters workerParams){
    super(context,workParams);
    this.context = context;
}