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/*
* 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 org.mozilla.thirdparty.com.google.android.exoplayer2.scheduler;
import android.annotation.TargetApi;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkCapabilities;
import android.os.Handler;
import android.os.Looper;
import android.os.PowerManager;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
/**
* Watches whether the {@link Requirements} are met and notifies the {@link Listener} on changes.
*/
public final class RequirementsWatcher {
/**
* Notified when RequirementsWatcher instance first created and on changes whether the {@link
* Requirements} are met.
*/
public interface Listener {
/**
* Called when there is a change on the met requirements.
*
* @param requirementsWatcher Calling instance.
* @param notMetRequirements {@link Requirements.RequirementFlags RequirementFlags} that are not
* met, or 0.
*/
void onRequirementsStateChanged(
RequirementsWatcher requirementsWatcher,
@Requirements.RequirementFlags int notMetRequirements);
}
private final Context context;
private final Listener listener;
private final Requirements requirements;
private final Handler handler;
@Nullable private DeviceStatusChangeReceiver receiver;
@Requirements.RequirementFlags private int notMetRequirements;
@Nullable private NetworkCallback networkCallback;
/**
* @param context Any context.
* @param listener Notified whether the {@link Requirements} are met.
* @param requirements The requirements to watch.
*/
public RequirementsWatcher(Context context, Listener listener, Requirements requirements) {
this.context = context.getApplicationContext();
this.listener = listener;
this.requirements = requirements;
handler = new Handler(Util.getLooper());
}
/**
* Starts watching for changes. Must be called from a thread that has an associated {@link
* Looper}. Listener methods are called on the caller thread.
*
* @return Initial {@link Requirements.RequirementFlags RequirementFlags} that are not met, or 0.
*/
@Requirements.RequirementFlags
public int start() {
notMetRequirements = requirements.getNotMetRequirements(context);
IntentFilter filter = new IntentFilter();
if (requirements.isNetworkRequired()) {
if (Util.SDK_INT >= 24) {
registerNetworkCallbackV24();
} else {
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
}
}
if (requirements.isChargingRequired()) {
filter.addAction(Intent.ACTION_POWER_CONNECTED);
filter.addAction(Intent.ACTION_POWER_DISCONNECTED);
}
if (requirements.isIdleRequired()) {
if (Util.SDK_INT >= 23) {
filter.addAction(PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED);
} else {
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
}
}
receiver = new DeviceStatusChangeReceiver();
context.registerReceiver(receiver, filter, null, handler);
return notMetRequirements;
}
/** Stops watching for changes. */
public void stop() {
context.unregisterReceiver(Assertions.checkNotNull(receiver));
receiver = null;
if (Util.SDK_INT >= 24 && networkCallback != null) {
unregisterNetworkCallbackV24();
}
}
/** Returns watched {@link Requirements}. */
public Requirements getRequirements() {
return requirements;
}
@TargetApi(24)
private void registerNetworkCallbackV24() {
ConnectivityManager connectivityManager =
Assertions.checkNotNull(
(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE));
networkCallback = new NetworkCallback();
connectivityManager.registerDefaultNetworkCallback(networkCallback);
}
@TargetApi(24)
private void unregisterNetworkCallbackV24() {
ConnectivityManager connectivityManager =
(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
connectivityManager.unregisterNetworkCallback(Assertions.checkNotNull(networkCallback));
networkCallback = null;
}
private void checkRequirements() {
@Requirements.RequirementFlags
int notMetRequirements = requirements.getNotMetRequirements(context);
if (this.notMetRequirements != notMetRequirements) {
this.notMetRequirements = notMetRequirements;
listener.onRequirementsStateChanged(this, notMetRequirements);
}
}
private class DeviceStatusChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (!isInitialStickyBroadcast()) {
checkRequirements();
}
}
}
@RequiresApi(24)
private final class NetworkCallback extends ConnectivityManager.NetworkCallback {
boolean receivedCapabilitiesChange;
boolean networkValidated;
@Override
public void onAvailable(Network network) {
onNetworkCallback();
}
@Override
public void onLost(Network network) {
onNetworkCallback();
}
@Override
public void onCapabilitiesChanged(Network network, NetworkCapabilities networkCapabilities) {
boolean networkValidated =
networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED);
if (!receivedCapabilitiesChange || this.networkValidated != networkValidated) {
receivedCapabilitiesChange = true;
this.networkValidated = networkValidated;
onNetworkCallback();
}
}
private void onNetworkCallback() {
handler.post(
() -> {
if (networkCallback != null) {
checkRequirements();
}
});
}
}
}
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