我创建了一个需要能够相互通信的服务和活动。活动应向服务发送消息,服务应回复结果。
问题是Message似乎没有进入服务。这是代码输出到日志:
02-07 18:26:37.057: I/Task Timer(8850): Service bound
02-07 18:26:37.097: V/Task Timer(8850): Service connected: ComponentInfo{com.gawdl3y.android.tasktimer/com.gawdl3y.android.tasktimer.TaskService}
02-07 18:26:37.097: I/Task Timer(8850): Activity sent message: { what=1 when=-1d11h33m57s160ms }
02-07 18:26:37.167: I/ActivityManager(482): Displayed com.gawdl3y.android.tasktimer/.TaskListActivity: +166ms
记录了应用程序中的其他任何内容。 这是我的相关代码:
TaskService.java
public class TaskService extends Service {
public static String TAG = null;
private final IBinder binder = new ServiceBinder();
private Messenger messenger = new Messenger(new IncomingHandler()), activityMessenger;
@Override
public void onCreate() {
Log.i(getString(R.string.app_name), "Service started");
TAG = getString(R.string.service_label);
}
@Override
public IBinder onBind(Intent intent) {
return binder;
}
@Override
public void onDestroy() {
Log.i(TAG, "Service destroyed");
}
public class ServiceBinder extends Binder {
TaskService getService() {
return TaskService.this;
}
}
private final class IncomingHandler extends Handler {
@Override
public void handleMessage(Message msg) {
activityMessenger = msg.replyTo;
Log.i(TAG, "Service received message: " + msg);
switch(msg.what) {
case TaskListActivity.MSG_GET_TASKS:
// Create the response message and send it
Message response = Message.obtain(null, 1, tasks);
try {
activityMessenger.send(response);
Log.i(TAG, "Service sent message: " + response);
} catch(android.os.RemoteException e) {
Log.i(TAG, "Service failed to send message: " + response + " (" + e.getLocalizedMessage() + " caused by " + e.getCause() + ")");
}
// Return the message to the global pool
response.recycle();
break;
default:
super.handleMessage(msg);
}
}
}
}
TaskListActivity.java
public class TaskListActivity extends SherlockActivity {
public static final int MSG_GET_TASKS = 1;
private TaskService service;
private Messenger messenger = new Messenger(new IncomingHandler()), serviceMessenger;
private boolean connected = false;
private ServiceConnection serviceConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName name, IBinder service) {
Log.v(TAG, "Service connected: " + name);
// Set the service messenger and connected status
TaskListActivity.this.serviceMessenger = new Messenger(service);
TaskListActivity.this.connected = true;
// Create a new message to send to retrieve the tasks
Message msg = Message.obtain(null, MSG_GET_TASKS);
msg.replyTo = messenger;
// Send the message
try {
serviceMessenger.send(msg);
Log.i(TAG, "Activity sent message: " + msg);
} catch(android.os.RemoteException e) {
Log.i(TAG, "Activity failed to send message: " + msg + " (" + e.getLocalizedMessage() + " caused by " + e.getCause() + ")");
}
// Return the message to the global pool
msg.recycle();
}
public void onServiceDisconnected(ComponentName name) {
Log.v(TAG, "Service disconnected: " + name);
// Reset the service messenger and connection status
TaskListActivity.this.serviceMessenger = null;
TaskListActivity.this.connected = false;
}
};
@Override
protected void onStart() {
super.onStart();
// Show the loading indicator
//setSupportProgressBarIndeterminateVisibility(true);
// Start and bind the service
Intent intent = new Intent(this, TaskService.class);
startService(intent);
if(bindService(intent, serviceConnection, Context.BIND_ABOVE_CLIENT | Context.BIND_ADJUST_WITH_ACTIVITY)) {
Log.i(TAG, "Service bound");
} else {
Log.i(TAG, "Service not bound");
Toast.makeText(this, "Task Service couldn't be bound", Toast.LENGTH_SHORT).show();
finish();
}
}
@Override
protected void onStop() {
super.onStop();
// Unbind service
unbindService(serviceConnection);
Log.i(TAG, "Service unbound");
}
private final class IncomingHandler extends Handler {
@Override
public void handleMessage(Message msg) {
switch(msg.what) {
case MSG_GET_TASKS:
Log.i(TAG, "Activity received message: " + msg);
onTasksLoaded((ArrayList<Task>) msg.obj);
break;
default:
super.handleMessage(msg);
}
}
}
}
答案 0 :(得分:2)
在你的onBind方法中,你可以尝试返回messenger.getBinder()而不是绑定器吗?