EventBus - Android's Event Bus _eventbus

识字粗堪供赋役，不须辛苦慕公卿。这篇文章主要讲述EventBus - Android' s Event Bus相关的知识，希望能为你提供帮助。

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[1] About EventBus【EventBus - Android' s Event Bus】EventBus is a publish/subscribe event bus for android

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EventBus...

simplifies the communication between components
- decouples event senders and receivers
- performs well with Activities, Fragments, and background threads
- avoids complex and error-prone dependencies and life cycle issues
makes your code simpler
is fast
is tiny (~50k jar)
is proven in practice by apps with 100,000,000+ installs
has advanced features like delivery threads, subscriber priorities, etc.

[2] Add EventBusIn your build.gradle :

dependencies { compile ‘org.greenrobot:eventbus:3.0.0‘ }

[3] Use EventBus

Define events:

package com.netcircle.myeventbusdemo; /** * Created by sweetgirl on 2017/11/27 */ public class UserMessage { public final String mName ; public final String mPassword; public UserMessage(String name, String password){ this.mName = name; this.mPassword = password; } }

Prepare subscribers:

package com.netcircle.myeventbusdemo; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import org.greenrobot.eventbus.EventBus; import org.greenrobot.eventbus.Subscribe; import org.greenrobot.eventbus.ThreadMode; public class MainActivity extends AppCompatActivity {private TextView textView; private EditText input_name; private EditText input_password; private Button btn_login; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); EventBus.getDefault().register(this); initView(); }private void initView(){setContentView(R.layout.activity_main); textView = (TextView) findViewById(R.id.tv_signup); input_name = (EditText) findViewById(R.id.input_name); input_password = (EditText) findViewById(R.id.input_password); textView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this, RegisterActivity.class); startActivity(intent); } }); }@Subscribe public void onMessageEvent(UserMessage event) {Toast.makeText(MainActivity.this,"MainActivity"+event.mName+event.mPassword,Toast.LENGTH_SHORT).show(); Log.i("MainActivity"+event.mName,"MainActivity-psw"+event.mPassword); }@Override protected void onDestroy() { EventBus.getDefault().unregister(this); super.onDestroy(); } }

Post events:

package com.netcircle.myeventbusdemo; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import org.greenrobot.eventbus.EventBus; public class RegisterActivity extends AppCompatActivity {private EditText et_input_name; private EditText et_input_password; private Button btn_registered; private String name; private String psw; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_register); et_input_name = (EditText) findViewById(R.id.et_input_name); et_input_password = (EditText) findViewById(R.id.et_input_password); btn_registered = (Button) findViewById(R.id.btn_registered); name = et_input_name.getText().toString(); psw = et_input_password.getText().toString(); btn_registered.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) {name = et_input_name.getText().toString(); psw = et_input_password.getText().toString(); Log.i("RegisterActivity-name"+name,"RegisterActivity-psw"+psw); EventBus.getDefault().post(new UserMessage(name,psw)); Intent intent = new Intent(RegisterActivity.this,MainActivity.class); startActivity(intent); } }); } }

[4] Demo Completesee Log

11-28 10:39:05.656 25999-25999/com.netcircle.myeventbusdemo I/RegisterActivity-name123: RegisterActivity-pswqwe 11-28 10:39:05.676 25999-25999/com.netcircle.myeventbusdemo I/MainActivity123: MainActivity-pswqwe