MainActivity:
package com.example.day12eventbus;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;
public class MainActivity extends AppCompatActivity {
private TextView textView;
private Button but1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=findViewById(R.id.textview);
but1=findViewById(R.id.but1);
but1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(MainActivity.this,MyActivity.class);
startActivity(intent);
}
});
//注册
EventBus.getDefault().register(this);
}
@Subscribe(threadMode = ThreadMode.MAIN)
public void getMesg(Message message){
textView.setText(message.getMsg());
}
//注销
@Override
protected void onDestroy() {
super.onDestroy();
EventBus.getDefault().unregister(this);
}
}
Message:
package com.example.day12eventbus;
public class Message {
private String msg;
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
@Override
public String toString() {
return "Message{" +
"msg='" + msg + '\'' +
'}';
}
}
MyActivity:
package com.example.day12eventbus;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import org.greenrobot.eventbus.EventBus;
public class MyActivity extends Activity {
private Button but2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.myactivity);
but2=findViewById(R.id.but2);
but2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message=new Message();
message.setMsg("emmmmmm.....");
//发送事件调用这个方法
EventBus.getDefault().post(message);
finish();
}
});
}
}