为什么事件没有被订阅，也onMyEvent没有被调用。相关代码如下。Otto 在我的使用中正常工作，但以下场景涉及从回调处理程序发布事件（这是涉及 http 调用的代码的简化）。不确定这与它有什么关系。
我使用Otto（基于 Guava 事件总线）和Dagger（Guice）。希望Java专家也能看到我如何注入和使用下面的总线的任何问题。
申请（模块注册）
package com.example.ottocb;
import android.app.Application;
import android.content.Context;
import com.squareup.otto.Bus;
import dagger.Module;
import dagger.ObjectGraph;
import dagger.Provides;
import javax.inject.Singleton;
public class MyApplication extends Application {
private ObjectGraph objectGraph;
@Override
public void onCreate() {
super.onCreate();
objectGraph = ObjectGraph.create(new MyModule(this));
}
public ObjectGraph objectGraph() {
return objectGraph;
}
public void inject(Object object) {
objectGraph.inject(object);
}
@Module(entryPoints = {Bus.class, MyActivity.class,
MyFragment.class
})
static class MyModule {
private final Context appContext;
MyModule(Context appContext) {
this.appContext = appContext;
}
@Provides
@Singleton
Bus provideBus() {
return new Bus();
}
}
}
基本片段
package com.example.ottocb;
import android.app.Fragment;
import android.os.Bundle;
public class BaseFragment extends Fragment {
@Override
public void onCreate(Bundle state) {
super.onCreate(state);
((MyApplication) getActivity()
.getApplication())
.inject(this);
}
}
我的片段
package com.example.ottocb;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
import com.squareup.otto.Bus;
import com.squareup.otto.Subscribe;
import javax.inject.Inject;
public class MyFragment extends BaseFragment {
private static final String TAG = MyFragment.class.getName();
@Inject
Bus bus;
Button btn;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.myfragment, container,
false);
btn = (Button) view.findViewById(R.id.btn);
btn.setOnClickListener(btnOnClick);
return view;
}
Button.OnClickListener btnOnClick = new Button.OnClickListener() {
@Override
public void onClick(View v) {
Log.i(TAG, "onClick");
MyCB cb = new MyCB();
cb.success();
}
};
private class MyCB {
public void success() {
Log.i(TAG, "SUCCESS " );
bus.post(new MyEvent());
}
public void failure() {
Log.e(TAG, "Error");
}
}
@Subscribe
public void onMyEvent(MyEvent event) {
Log.i(TAG, "***** onMyEvent ********");
Toast.makeText(getActivity(), "***** RECEIVED EVENT *****", Toast.LENGTH_SHORT).show();
}
}
我的活动
package com.example.ottocb;
import android.app.Activity;
import android.os.Bundle;
public class MyActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
我的事件
package com.example.ottocb;
public class MyEvent {
}
主要的.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<fragment class="com.example.ottocb.MyFragment"
android:id="@+id/myfragment"
android:layout_width="match_parent" android:layout_height="match_parent" />
</FrameLayout>
我的片段.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Post" />
</LinearLayout>