EventBus(三)---Fragment案例通讯应用

MainActivity

package com.angeldevil.eventbusdemo;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

}

activity_main.xml主界面--左右两边均为fragment界面

<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:baselineAligned="false"
android:divider="?android:attr/dividerHorizontal"
android:orientation="horizontal"
android:showDividers="middle" >

<fragment
android:id="@+id/item_list"
android:name="com.angeldevil.eventbusdemo.ItemListFragment"
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_weight="1" />

<fragment
android:id="@+id/item_detail_container"
android:name="com.angeldevil.eventbusdemo.ItemDetailFragment"
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_weight="2" />

</LinearLayout>

Item

package com.angeldevil.eventbusdemo;

import java.util.ArrayList;
import java.util.List;

/**
*
* 这个类的作用： Item有id、content2个属性 类包含一个静态集合ITEMS 初始化6个Item元素
*
*/
public class Item {
public String id;
public String content;

public static List<Item> ITEMS = new ArrayList<Item>();
static {
// Add 6 sample items.
addItem(new Item("1", "Item 1"));
addItem(new Item("2", "Item 2"));
addItem(new Item("3", "Item 3"));
addItem(new Item("4", "Item 4"));
addItem(new Item("5", "Item 5"));
addItem(new Item("6", "Item 6"));
}

private static void addItem(Item item) {
ITEMS.add(item);
}

public Item(String id, String content) {
this.id = id;
this.content = content;
}

@Override
public String toString() {
return content;
}
}

Event

package com.angeldevil.eventbusdemo;

import java.util.List;

/**
* 对外提供一个返回Items集合的方法
*/
public class Event {
/** 列表加载事件 */
public static class ItemListEvent {
private List<Item> items;

public ItemListEvent(List<Item> items) {
this.items = items;
}

public List<Item> getItems() {
return items;
}
}

}

接下来看左边部分ItemListFragment

package com.angeldevil.eventbusdemo;

import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.angeldevil.eventbusdemo.Event.ItemListEvent;

import de.greenrobot.event.EventBus;

public class ItemListFragment extends ListFragment {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Register
EventBus.getDefault().register(this);
}

@Override
public void onDestroy() {
super.onDestroy();
// Unregister
EventBus.getDefault().unregister(this);
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// 开启线程加载列表
new Thread() {
public void run() {
try {
Thread.sleep(2000); // 模拟延时
// 发布事件，在后台线程发的事件
EventBus.getDefault().post(new ItemListEvent(Item.ITEMS));
} catch (InterruptedException e) {
e.printStackTrace();
}
};
}.start();
}

/**
* 在主线程更新ui界面
*
* @param event
*/
public void onEventMainThread(ItemListEvent event) {
setListAdapter(new ArrayAdapter<Item>(getActivity(),
android.R.layout.simple_list_item_activated_1,
android.R.id.text1, event.getItems()));
}

@Override
public void onListItemClick(ListView listView, View view, int position,
long id) {
super.onListItemClick(listView, view, position, id);
EventBus.getDefault().post(getListView().getItemAtPosition(position));
}

}

ItemDetailFragment

package com.angeldevil.eventbusdemo;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import de.greenrobot.event.EventBus;

public class ItemDetailFragment extends Fragment {

private TextView tvDetail;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// register
EventBus.getDefault().register(this);
}

@Override
public void onDestroy() {
super.onDestroy();
// Unregister
EventBus.getDefault().unregister(this);
}

/** List点击时会发送些事件，接收到事件后更新详情 */
public void onEventMainThread(Item item) {
if (item != null)
tvDetail.setText(item.content);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_item_detail,
container, false);
tvDetail = (TextView) rootView.findViewById(R.id.item_detail);
return rootView;
}
}

fragment_item_detail.xml

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/item_detail"
style="?android:attr/textAppearanceLarge"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
android:textIsSelectable="true"
tools:context="com.angeldevil.eventbusdemo.ItemDetailFragment" />