76 lines
2.3 KiB
Java
76 lines
2.3 KiB
Java
package com.wireguard.android;
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import android.app.Activity;
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import android.content.ComponentName;
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import android.content.Context;
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import android.content.Intent;
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import android.content.ServiceConnection;
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import android.os.IBinder;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Base class for activities that maintain a connection to a background service.
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*/
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abstract class ServiceClientActivity<T> extends Activity implements ServiceConnectionProvider<T> {
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private final ServiceConnectionCallbacks callbacks = new ServiceConnectionCallbacks();
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private final List<ServiceConnectionListener<T>> listeners = new ArrayList<>();
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private T service;
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private final Class<?> serviceClass;
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protected ServiceClientActivity(Class<?> serviceClass) {
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this.serviceClass = serviceClass;
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}
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@Override
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public void addServiceConnectionListener(ServiceConnectionListener<T> listener) {
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listeners.add(listener);
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}
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public T getService() {
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return service;
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}
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@Override
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public void onStart() {
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super.onStart();
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bindService(new Intent(this, serviceClass), callbacks, Context.BIND_AUTO_CREATE);
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}
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@Override
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public void onStop() {
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super.onStop();
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if (service != null) {
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service = null;
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unbindService(callbacks);
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for (ServiceConnectionListener listener : listeners)
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listener.onServiceDisconnected();
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}
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}
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@Override
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public void removeServiceConnectionListener(ServiceConnectionListener<T> listener) {
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listeners.remove(listener);
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}
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private class ServiceConnectionCallbacks implements ServiceConnection {
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@Override
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public void onServiceConnected(ComponentName component, IBinder binder) {
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@SuppressWarnings("unchecked")
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final T localBinder = (T) binder;
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service = localBinder;
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for (ServiceConnectionListener<T> listener : listeners)
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listener.onServiceConnected(service);
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}
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@Override
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public void onServiceDisconnected(ComponentName component) {
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service = null;
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for (ServiceConnectionListener<T> listener : listeners)
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listener.onServiceDisconnected();
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}
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}
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}
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