BatteryNotLowTracker.java
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.work.impl.constraints.trackers;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import androidx.annotation.NonNull;
import androidx.annotation.RestrictTo;
import androidx.work.Logger;
import androidx.work.impl.utils.taskexecutor.TaskExecutor;
/**
* Tracks whether or not the device's battery level is low.
* @hide
*/
@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
public class BatteryNotLowTracker extends BroadcastReceiverConstraintTracker<Boolean> {
private static final String TAG = Logger.tagWithPrefix("BatteryNotLowTracker");
/**
* {@see https://android.googlesource.com/platform/frameworks/base/+/oreo-release/services/core/java/com/android/server/BatteryService.java#111}
*/
static final int BATTERY_PLUGGED_NONE = 0;
/**
* {@see https://android.googlesource.com/platform/frameworks/base/+/oreo-release/core/res/res/values/config.xml#986}
*/
static final float BATTERY_LOW_PERCENTAGE = 0.15f;
/**
* Create an instance of {@link BatteryNotLowTracker}.
* @param context The application {@link Context}
* @param taskExecutor The internal {@link TaskExecutor} being used by WorkManager.
*/
public BatteryNotLowTracker(@NonNull Context context, @NonNull TaskExecutor taskExecutor) {
super(context, taskExecutor);
}
/**
* Based on BatteryService#shouldSendBatteryLowLocked(), but this ignores the previous plugged
* state - cannot guarantee the last plugged state because this isn't always tracking.
*
* {@see https://android.googlesource.com/platform/frameworks/base/+/oreo-release/services/core/java/com/android/server/BatteryService.java#268}
*/
@Override
public Boolean getInitialState() {
IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent intent = mAppContext.registerReceiver(null, intentFilter);
if (intent == null) {
Logger.get().error(TAG, "getInitialState - null intent received");
return null;
}
int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, BATTERY_PLUGGED_NONE);
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
float batteryPercentage = level / (float) scale;
return (plugged != BATTERY_PLUGGED_NONE
|| status == BatteryManager.BATTERY_STATUS_UNKNOWN
|| batteryPercentage > BATTERY_LOW_PERCENTAGE);
}
@Override
public IntentFilter getIntentFilter() {
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(Intent.ACTION_BATTERY_OKAY);
intentFilter.addAction(Intent.ACTION_BATTERY_LOW);
return intentFilter;
}
@Override
public void onBroadcastReceive(Context context, @NonNull Intent intent) {
if (intent.getAction() == null) {
return;
}
Logger.get().debug(TAG, String.format("Received %s", intent.getAction()));
switch (intent.getAction()) {
case Intent.ACTION_BATTERY_OKAY:
setState(true);
break;
case Intent.ACTION_BATTERY_LOW:
setState(false);
break;
}
}
}