我已经通过各种方法使这个项目的工作，并最终确定了从绿色机器人事件总线。关于这一点，我的第二个问题是：-Multiple Fragment to Activity communication。
我被引导到那里的活动巴士路线上。我已经加入了适当的图书馆，我想我已经很接近使它发挥作用。无论哪一行包含
eBus.post(Str);
我相当肯定，因为我没有正确注册ebus。我知道一个片段没有这样的上下文，但我也尝试过使用getActivity（）也没有用。我已经发布了下面的主要活动，corefragment和logcat。如果有人能帮忙，我将不胜感激。这已经持续了近一个月，断断续续！！
import de.greenrobot.event.EventBus;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.EditText;
public class MainActivity extends Activity {
EditText editText1;
String Txt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText1 = (EditText) findViewById(R.id.editText1);
Txt = "";
EventBus eBus = new EventBus();
eBus.register(this);<--This I removed.
eBus.getDefault().register(this);<--This is the new line you suggested
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void onEvent(String event){
Txt = Txt + event;
editText1.setText(Txt);<--Left this as it was,it worked
}
}//End
下面是片段代码：
import de.greenrobot.event.EventBus;
import android.app.Activity;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.os.Bundle;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.view.View.OnClickListener;
public class CoreFragment extends Fragment{
int index;
Button Button1,Button2,Button3;
String Str,data;
EventBus eBus;
@Override
public void onAttach(Activity a) {
super.onAttach(a);
EventBus eBus = new EventBus();
eBus.getDefault().register(this);
}
public static CoreFragment newInstance(int index) {
CoreFragment coreFragment = new CoreFragment();
coreFragment.index = index;
return coreFragment;
}
public void onEvent(String event){
// Crash Stopper
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
// We have different layouts, and in one of them this
// fragment's containing frame doesn't exist. The fragment
// may still be created from its saved state, but there is
// no reason to try to create its view hierarchy because it
// won't be displayed. Note this is not needed -- we could
// just run the code below, where we would create and return
// the view hierarchy; it would just never be used.
return null;
}
RelativeLayout mRelativeLayout = (RelativeLayout) inflater.inflate(R.layout.corefragment,
container, false);
Button Button1 = (Button) mRelativeLayout.findViewById(R.id.Button1);
Button Button2 = (Button) mRelativeLayout.findViewById(R.id.Button2);
Button Button3 = (Button) mRelativeLayout.findViewById(R.id.Button3);
Button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Str = "I ";
eBus.post(Str);<--Old code, removed in working version
eBus.getDefault().post(Str);<--Changed as suggested
}
});
Button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Str = "want ";
eBus.post(Str);<--Old code, removed in working version
eBus.getDefault().post(Str);<--Changed as suggested
}
});
Button3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Str = "more ";
eBus.post(Str);<--Old code, removed in working version
eBus.getDefault().post(Str);<--Changed as suggested
}
});
return mRelativeLayout;
}
}//end
我尝试过各种排列，例如ebus.register（this）；、ebus.register（this，string.class）；、ebus.register（getActivity（））；等等。
这是按下按钮1时的日志：
02-13 13:56:40.717: W/dalvikvm(26237): threadid=1: thread exiting with uncaught exception (group=0x40acf228)
02-13 13:56:40.747: E/AndroidRuntime(26237): FATAL EXCEPTION: main
02-13 13:56:40.747: E/AndroidRuntime(26237): java.lang.NullPointerException
02-13 13:56:40.747: E/AndroidRuntime(26237): at com.epsilonitsystems.fragger.CoreFragment$1.onClick(CoreFragment.java:65)
02-13 13:56:40.747: E/AndroidRuntime(26237): at android.view.View.performClick(View.java:3549)
02-13 13:56:40.747: E/AndroidRuntime(26237): at android.view.View$PerformClick.run(View.java:14393)
02-13 13:56:40.747: E/AndroidRuntime(26237): at android.os.Handler.handleCallback(Handler.java:605)
02-13 13:56:40.747: E/AndroidRuntime(26237): at android.os.Handler.dispatchMessage(Handler.java:92)
02-13 13:56:40.747: E/AndroidRuntime(26237): at android.os.Looper.loop(Looper.java:154)
02-13 13:56:40.747: E/AndroidRuntime(26237): at android.app.ActivityThread.main(ActivityThread.java:4945)
02-13 13:56:40.747: E/AndroidRuntime(26237): at java.lang.reflect.Method.invokeNative(Native Method)
02-13 13:56:40.747: E/AndroidRuntime(26237): at java.lang.reflect.Method.invoke(Method.java:511)
02-13 13:56:40.747: E/AndroidRuntime(26237): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-13 13:56:40.747: E/AndroidRuntime(26237): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-13 13:56:40.747: E/AndroidRuntime(26237): at dalvik.system.NativeStart.main(Native Method)
我试过的各种编译方法都很好，没有错误，但每次按下屏幕上的按钮都会强制关闭。
有什么想法吗？？谢谢。
最佳答案
尝试以下建议：
1。注册到事件总线的任何位置使用：
EventBus.getDefault().register(this);
2。当您要发布事件时，请使用：
EventBus.getDetault().post(new MyEvent(aString));
三.如果要更改UI，请确保将事件方法命名为：
public void onEventMainThread(MyEvent event){
editText1.setText(event.getString());
}
4。定义一个事件类来保存结果：
public class MyEvent(){
private mString;
public MyEvent(String string){
mString = string;
}
public getString(){
return mString;
}
}
5。不要忘记通过调用以下命令从EventBus注销组件：
EventBus.getDefault().unregister(this);