我正在使用GCM开发具有推送通知功能的android应用程序。我创建了一个名为PushNotificationService的类，该类扩展了GCMListenerService。在onMessageReceived(String from, Bundle data)内部，我可以在推送通知中获取消息。
现在，无论何时在推送中收到特定消息时，我都想访问MainActivity类中的方法。
以下是我的代码：-
PushNotificationService.java
public class PushNotificationService extends GcmListenerService {
@Override
public void onMessageReceived(String from, Bundle data) {
// TODO Auto-generated method stub
super.onMessageReceived(from, data);
String message = data.getString("message");
if(message.equalsIgnoreCase("Begin Task"))
{
//call method from MainActivity.class
}
}
}
MainActivty.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void beginTask()
{
Log.d("GCM","Message Received from Server");
finish();
}
}
我希望每当收到消息“ Begin Task”时都执行beginTask（）方法。
我知道一种方法是通过Service-> Interface-> Activity体系结构，但是由于我从未创建过PushNotificationService的对象，因此无法使用它。
请帮忙。
更新：-
我现在正在使用Otto Library，下面是我的代码。
添加了新的MyBus.java
public class MyBus extends Bus {
private static Bus bus;
//isRegistered is used to track the current registration status
private static boolean isRegistered;
private Handler handler = new Handler(Looper.getMainLooper());
public MyBus() {
if (bus == null) {
//ANY will allow event bus to run even with services
//and broadcast receivers
bus = new Bus(ThreadEnforcer.ANY);
}
}
@Override
public void register(Object obj) {
//The bus is registered when an activity starts
bus.register(obj);
isRegistered = true;
}
@Override
public void unregister(Object obj) {
//The bus is unregistered when an activity goes to background
bus.unregister(obj);
isRegistered = false;
}
@Override
public void post(final Object event) {
if (Looper.myLooper() == Looper.getMainLooper()) {
//post the event in main thread or background thread
bus.post(event);
} else {
handler.post(new Runnable() {
@Override
public void run() {
bus.post(event);
}
});
}
}
public boolean isRegistered(){
return isRegistered;
}
}
PushNotificationService.java
public class PushNotificationService extends GcmListenerService {
@Override
public void onMessageReceived(String from, Bundle data) {
// TODO Auto-generated method stub
super.onMessageReceived(from, data);
MyBus myBus = new MyBus();
myBus.register(myBus);
String message = data.getString("message");
if(message.equalsIgnoreCase("Begin Task"))
{
myBus.post(message);
}
}
}
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Subscribe
public void beginTask()
{
Log.d("GCM","Message Received from Server");
}
}
问题仍然没有解决。 MainActivity.java中的beginTask（）仍未调用。
最佳答案
使用eventBus库促进此过程...
我在此过程中使用Otto
http://square.github.io/otto/
这是另一个eventBus库https://greenrobot.github.io/EventBus/
脚步：
1.从服务创建事件
2.在活动中添加一个侦听器
3.如果活动正在运行，该方法将被执行
**编辑1：**
我已经像这样抽象了otto总线。
package com.mypackage.eventBus;
import android.os.Handler;
import android.os.Looper;
import com.squareup.otto.Bus;
import com.squareup.otto.ThreadEnforcer;
/**
* Created by gowtham on 10/6/15.
*/
public class MyBus extends Bus {
private static Bus bus;
//isRegistered is used to track the current registration status
private static boolean isRegistered;
private Handler handler = new Handler(Looper.getMainLooper());
public MyBus() {
if (bus == null) {
//ANY will allow event bus to run even with services
//and broadcast receivers
bus = new Bus(ThreadEnforcer.ANY);
}
}
@Override
public void register(Object obj) {
//The bus is registered when an activity starts
bus.register(obj);
isRegistered = true;
}
@Override
public void unregister(Object obj) {
//The bus is unregistered when an activity goes to background
bus.unregister(obj);
isRegistered = false;
}
@Override
public void post(final Object event) {
if (Looper.myLooper() == Looper.getMainLooper()) {
//post the event in main thread or background thread
bus.post(event);
} else {
handler.post(new Runnable() {
@Override
public void run() {
bus.post(event);
}
});
}
}
public boolean isRegistered(){
return isRegistered;
}
}
创建上述对象的实例，然后尝试发布事件
编辑2对Jcarlo的评论
请按照以下步骤查找活动的状态。
在您活动的onResume中，调用MyBus.getInstance（）。register（this）。
在活动的onPause中，调用MyBus.getInstance（）。unregister（this）。
在发布消息之前，在您的GCM IntentService中
if（MyBus.getInstance（）。isRegistered（））{
// app还活着
//发布数据
}其他{
//显示通知
}
希望这可以帮助