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在没用eventBus之前一直用Android广播方式通知消息更新UI
广播写法
首先发送广播通知
Intent intent = new Intent();
intent.setAction("action.refreshFriend"); //名称自定义标识是哪个通知消息
sendBroadcast(intent);
接收广播通知
首先注册广播
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("action.refreshFriend");
registerReceiver(mRefreshBroadcastReceiver, intentFilter);
private BroadcastReceiver mRefreshBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals("action.refreshFriend"))
{
//更新UI
}
}
};
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mRefreshBroadcastReceiver); //销毁广播
}
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https://github.com/greenrobot/EventBus
EventBus是Android的发布/订阅事件总线优化。
首先添加引用
compile ‘org.greenrobot:eventbus:3.0.0‘
MainActivity代码
package com.freexiaoyu.enevtbus; 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; import butterknife.BindView; import butterknife.ButterKnife; import butterknife.OnClick; public class MainActivity extends AppCompatActivity { @BindView(R.id.tv_test) TextView tv_text; @BindView(R.id.btn_post) Button btn_post; @BindView(R.id.btn_post2) Button btn_post2; @BindView(R.id.btn_post3) Button btn_post3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ButterKnife.bind(this); EventBus.getDefault().register(this); } @Subscribe(threadMode = ThreadMode.MAIN) public void helloEventBus(Event event) { switch (event.getType()){ case 1: tv_text.setText(event.getMessage().toString()); break; case 2: tv_text.setText(event.getMessage().toString()); break; case 3: tv_text.setText(event.getMessage().toString()); break; } } @Override protected void onDestroy() { super.onDestroy(); EventBus.getDefault().unregister(this); } @OnClick({R.id.btn_post,R.id.btn_post2,R.id.btn_post3}) public void submit(View view) { switch (view.getId()){ case R.id.btn_post: EventBus.getDefault().post(new Event(1,"我是老大")); break; case R.id.btn_post2: EventBus.getDefault().post(new Event(2,"我是老二")); break; case R.id.btn_post3: Intent intent=new Intent(MainActivity.this,TestActivity.class); startActivity(intent); break; } } }
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:id="@id/tv_test" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" /> <Button android:id="@id/btn_post" android:layout_width="match_parent" android:layout_height="52.0dp" android:text="EventBus" /> <Button android:id="@id/btn_post2" android:layout_width="match_parent" android:layout_height="52.0dp" android:text="EventBus" /> <Button android:id="@id/btn_post3" android:layout_width="match_parent" android:layout_height="52.0dp" android:text="跳转界面" /> </LinearLayout>
TestActivity代码
package com.freexiaoyu.enevtbus; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import org.greenrobot.eventbus.EventBus; import butterknife.BindView; import butterknife.ButterKnife; import butterknife.OnClick; public class TestActivity extends AppCompatActivity { @BindView(R.id.btn_post) Button btn_post; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test); ButterKnife.bind(this); } @OnClick({R.id.btn_post}) public void submit(View view) { switch (view.getId()){ case R.id.btn_post: EventBus.getDefault().post(new Event(3,"我是小三哈哈!")); break; } } @Override protected void onDestroy() { super.onDestroy(); } }
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@id/btn_post" android:layout_width="match_parent" android:layout_height="52.0dp" android:text="我要更新上一页内容" /> </RelativeLayout>
DEMO地址 https://yunpan.cn/cB3SH2Ig7dAZU 访问密码 aad8
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原文地址：http://www.cnblogs.com/freexiaoyu/p/5650605.html
