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package com.mapbox.mapboxsdk.net;
import android.annotation.SuppressLint;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.UiThread;
import com.mapbox.mapboxsdk.log.Logger;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* Interface definition for a callback to be invoked when connectivity changes.
* Not public api.
*/
public class ConnectivityReceiver extends BroadcastReceiver {
private static final String TAG = "Mbgl-ConnectivityReceiver";
private static final String LOG_CONNECTED = "connected - true";
private static final String LOG_NOT_CONNECTED = "connected - false";
@SuppressLint("StaticFieldLeak")
private static ConnectivityReceiver INSTANCE;
/**
* Get a single instance of ConnectivityReceiver.
*
* @param context the context to extract the application context from
* @return single instance of ConnectivityReceiver
*/
public static synchronized ConnectivityReceiver instance(@NonNull Context context) {
if (INSTANCE == null) {
// Register new instance
INSTANCE = new ConnectivityReceiver(context.getApplicationContext());
// Add default listeners
INSTANCE.addListener(new NativeConnectivityListener());
}
return INSTANCE;
}
@NonNull
private List<ConnectivityListener> listeners = new CopyOnWriteArrayList<>();
private Context context;
private int activationCounter;
@Nullable
private Boolean connected;
private ConnectivityReceiver(@NonNull Context context) {
this.context = context;
}
/**
* Activates the connectivity receiver.
* <p>
* if the underlying connectivity receiver isn't active, register the connectivity receiver.
* </p>
*/
@UiThread
public void activate() {
if (activationCounter == 0) {
context.registerReceiver(this, new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE"));
}
activationCounter++;
}
/**
* Deactivates the connectivity receiver.
* <p>
* if no other components are listening, unregister the underlying connectivity receiver.
* </p>
*/
@UiThread
public void deactivate() {
activationCounter--;
if (activationCounter == 0) {
context.unregisterReceiver(INSTANCE);
}
}
/**
* {@inheritDoc}
*/
@Override
public void onReceive(@NonNull Context context, Intent intent) {
if (connected != null) {
// Connectivity state overridden by app
return;
}
notifyListeners(isNetworkActive());
}
/**
* Overwrites system connectivity state. To set, use {@link com.mapbox.mapboxsdk.Mapbox#setConnected(Boolean)}.
*
* @param connected flag to determine the connectivity state, true for connected, false for
* disconnected, and null for ConnectivityManager to determine.
*/
public void setConnected(Boolean connected) {
this.connected = connected;
boolean state;
if (connected != null) {
state = connected;
} else {
state = isNetworkActive();
}
notifyListeners(state);
}
private void notifyListeners(boolean isConnected) {
Logger.v(TAG, isConnected ? LOG_CONNECTED : LOG_NOT_CONNECTED);
// Loop over listeners
for (ConnectivityListener listener : listeners) {
listener.onNetworkStateChanged(isConnected);
}
}
/**
* Add a listener to be notified
*
* @param listener the listener to add
*/
public void addListener(@NonNull ConnectivityListener listener) {
listeners.add(listener);
}
/**
* Remove a listener
*
* @param listener the listener to remove
*/
public void removeListener(@NonNull ConnectivityListener listener) {
listeners.remove(listener);
}
/**
* Get current connectivity state
*
* @return true if connected
*/
public boolean isConnected() {
return connected != null ? connected : isNetworkActive();
}
private boolean isNetworkActive() {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return (activeNetwork != null && activeNetwork.isConnected());
}
}
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