来不及解释了,快上车之EventBus3.0快速上手

aevd9798 8年前
   <p>快速教你上手EventBus3.0,在EventBus3.0之前用法不同,就不在这里说了。</p>    <p>准备工作,建立EventBus3.0的依赖:</p>    <pre>  <code class="language-java">compile 'org.greenrobot:eventbus:3.0.0'</code></pre>    <h3><strong>基本使用</strong></h3>    <p>1.在需要订阅的组件内注册事件:</p>    <pre>  <code class="language-java">@Override  protected void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      setContentView(R.layout.activity_main);      message = (TextView) this.findViewById(R.id.message);      EventBus.getDefault().register(this);  }</code></pre>    <p>2.在结束的时候注销事件:</p>    <pre>  <code class="language-java">@Override  protected void onDestroy() {      super.onDestroy();      EventBus.getDefault().unregister(this);  }</code></pre>    <p>3.定义接受事件的方法,可以看到下面代码的源注释,当需要定义接受方法的时候,就需要如此申明</p>    <p><strong>threadMode = ThreadMode.MAIN</strong> 表示接受的方法发生的线程,其他线程指定的方式在下一章具体解释。</p>    <p>注意:参数不支持基本数据类型,想用整型必须使用Integer:</p>    <pre>  <code class="language-java">@Subscribe(threadMode = ThreadMode.MAIN)  public void onBus(String msg){      message.setText(msg);  }</code></pre>    <p>4.发送事件参数,发送的参数不支持基本数据类型:</p>    <pre>  <code class="language-java">public void oneView(View v){      EventBus.getDefault().post("开车了");  }</code></pre>    <p>以上就是EventBus的基本使用了:下面介绍一下简单的用法:</p>    <h3><strong>用法一,同一组件内发送和接收事件</strong></h3>    <pre>  <code class="language-java">package com.jelly.eventbus;    import android.content.Intent;  import android.os.Bundle;  import android.support.v7.app.AppCompatActivity;  import android.util.Log;  import android.view.View;  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 message;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          message = (TextView) this.findViewById(R.id.message);          EventBus.getDefault().register(this);      }        @Override      protected void onDestroy() {          super.onDestroy();          EventBus.getDefault().unregister(this);      }        /**       * 同一界面内传递字符串       * @param msg       */      @Subscribe(threadMode = ThreadMode.MAIN)      public void onBus(String msg){          message.setText(msg);      }          public void oneView(View v){          EventBus.getDefault().post("同一界面内点击");      }  }</code></pre>    <p>在Activity的生命周期onCreate方法中注册事件,在onDestroy()方法中注销事件,写了一个在主线程中执行的接收事件的方法修改TextView的值,点击按钮是发送事件。</p>    <h3><strong>用法二,事件传递自定义的对象</strong></h3>    <p>定义一个Bean</p>    <pre>  <code class="language-java">public class Message {      public String message;        public Message(String message) {          this.message = message;      }  }</code></pre>    <p>事件接收和发送逻辑,在这里发送的是自定义的对象</p>    <pre>  <code class="language-java">package com.jelly.eventbus;    import android.content.Intent;  import android.os.Bundle;  import android.support.v7.app.AppCompatActivity;  import android.util.Log;  import android.view.View;  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 message;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          message = (TextView) this.findViewById(R.id.message);          EventBus.getDefault().register(this);      }        @Override      protected void onDestroy() {          super.onDestroy();          EventBus.getDefault().unregister(this);      }        /**       * 传递对象       * @param msg       */      @Subscribe(threadMode = ThreadMode.MAIN)      public void onBus(Message msg){          message.setText(msg.message);      }        public void postObj(View v){          EventBus.getDefault().post(new Message("传递对象"));      }  }</code></pre>    <h3><strong>用法三,在不同的组件之间发送和接收事件</strong></h3>    <p>接收事件的Activity</p>    <pre>  <code class="language-java">package com.jelly.eventbus;    import android.content.Intent;  import android.os.Bundle;  import android.support.v7.app.AppCompatActivity;  import android.util.Log;  import android.view.View;  import android.widget.TextView;    import org.greenrobot.eventbus.EventBus;  import org.greenrobot.eventbus.Subscribe;  import org.greenrobot.eventbus.ThreadMode;    public class MainActivity extends AppCompatActivity {        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          message = (TextView) this.findViewById(R.id.message);          EventBus.getDefault().register(this);      }        @Override      protected void onDestroy() {          super.onDestroy();          EventBus.getDefault().unregister(this);      }        /**       * 不同组件之间传递数据       * @param i       */      @Subscribe(threadMode = ThreadMode.MAIN)      public void onBus(Integer i){          Log.v("bus",i+"");      }        public void secondView(View v){          Intent intent = new Intent(this,SecondActivity.class);          startActivity(intent);      }    }</code></pre>    <p>发送事件的Activity,刚开始写的时候在发送事件的Activity里面内也加上的注册和注销操作,然后运行失败,在发送事件的组件内不需要在注册和注销EventBus</p>    <pre>  <code class="language-java">package com.jelly.eventbus;    import android.app.Activity;  import android.os.Bundle;  import android.util.Log;  import android.view.View;    import org.greenrobot.eventbus.EventBus;    /**   * Created by Jelly on 2016/9/27.   */    public class SecondActivity extends Activity{        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          this.setContentView(R.layout.activity_second);      }        @Override      protected void onDestroy() {          super.onDestroy();      }        public void twoCon(View view){          Log.v("bus","点击");          EventBus.getDefault().post(1);      }    }</code></pre>    <p>在接收事件的Activity中启动发送事件的Activity,点击其中的按钮,打印的日志结果如下</p>    <p><img src="https://simg.open-open.com/show/15f23487a7774f32f4abf0b75c867711.png"></p>    <p> </p>    <p> </p>    <p> </p>    <p>来自:http://www.jianshu.com/p/57208945a9ab</p>    <p> </p>