学习EventBus的记录
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EventBus现在的应用比较广泛。要是你还没有听说过，或是没有用到，就有点out了。https://github.com/greenrobot/EventBus这是地址。
这里推荐一个blog大家可以去看一下，相当的不错
http://blog.csdn.net/lmj623565791/article/details/40920453与http://blog.csdn.net/lmj623565791/article/details/40794879，作者做了简单的例子，而且对源码进行了分析了。这里我把自己做的例子，放在此处，做一个记录。
例子，比较简单，一共两个功能，一个是从访问网上数据，通过 webserves来读取相关的数据，显示在页面当中，另一个就是我们现在常用的DrawerLayout来切换菜单。
一，访问网络下载加载到listview中
直接上代码：
activity_loading_data.xml主布局
<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" tools:context="com.example.cg.eventbuslearn.LoadingDataActivity" android:orientation="vertical"> <include layout="@layout/toolbar" /> <ListView android:id="@+id/lv_loadingdata" android:layout_width="match_parent" android:layout_height="match_parent"></ListView></LinearLayout>
activity_loadingdata_item.xml Item布局
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/txt_loadingdata_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp"/></LinearLayout>
LoadingData_Adatper.java 加载数据的Adapter
package com.example.cg.eventbuslearn.Adapter;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;import com.example.cg.eventbuslearn.R;import java.util.List;/** * 加载远程数据Adapter * Created by cg on 2016/1/13. */public class LoadingData_Adatper extends BaseAdapter { List<String> list_data; LayoutInflater inflater; public LoadingData_Adatper(Context context,List<String> list_data) { this.inflater = LayoutInflater.from(context); this.list_data = list_data; } @Override public int getCount() { return list_data.size(); } @Override public Object getItem(int position) { return list_data.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { loadingDataItem ldt; if(convertView==null) { ldt = new loadingDataItem(); convertView = inflater.inflate(R.layout.activity_loadingdata_item,null); ldt.name = (TextView)convertView.findViewById(R.id.txt_loadingdata_name); convertView.setTag(ldt); }else { ldt = (loadingDataItem)convertView.getTag(); } ldt.name.setText(list_data.get(position)); return convertView; } class loadingDataItem { TextView name; }}LoadingDataActivity.java 主程序
package com.example.cg.eventbuslearn;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.widget.ListView;import com.example.cg.eventbuslearn.Adapter.LoadingData_Adatper;import com.example.cg.eventbuslearn.untils.webservicesUntils;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import java.util.ArrayList;import java.util.List;import de.greenrobot.event.EventBus;public class LoadingDataActivity extends AppCompatActivity { private Toolbar toolbar; //定义toolbar private ListView lv_loadingdata; private LoadingData_Adatper lAdatper; private List<String> list_data; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_loading_data); toolbar = (Toolbar) this.findViewById(R.id.toolbar); toolbar.setTitle("EventBus加载远程数据"); setSupportActionBar(toolbar); //订阅事件 EventBus.getDefault().register(this); initControls(); initData(); } /** * 初始化数据 */ private void initData() { list_data = new ArrayList<>(); lAdatper = new LoadingData_Adatper(this,list_data); lv_loadingdata.setAdapter(lAdatper); new Thread(new Runnable() { @Override public void run() { try { String soapObject = webservicesUntils.getIndexItemList("", "", 1, 10); //Log.e("soapObject",soapObject); if (soapObject != "0") { try { JSONArray jsonArray = new JSONArray(soapObject); for (int i = 0; i < jsonArray.length(); i++) { JSONObject jsonObject2 = (JSONObject) jsonArray.opt(i); list_data.add(jsonObject2.getString("questionTitle")); } EventBus.getDefault().post(list_data); } catch (JSONException e) { // TODO Auto-generated catch block //Log.e("error",e.getMessage().toString()); e.printStackTrace(); } } } catch (Exception ex) { } } }).start(); } /** * 加载数据 * @param event */ public void onEventMainThread(List<String> event) { lAdatper.notifyDataSetChanged(); } /** * 初始化控件 */ private void initControls() { lv_loadingdata = (ListView)findViewById(R.id.lv_loadingdata); } @Override protected void onDestroy() { super.onDestroy(); //取消注册 EventBus.getDefault().unregister(this); }}二，通过DrawerLayout切换菜单
activity_fragment_to_fragment.xml主布局
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/drawer_main" android:layout_width="match_parent" android:layout_height="match_parent" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <include layout="@layout/toolbar" /> <!-- 内容界面 --> <FrameLayout android:id="@+id/frame_main" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> <!-- 侧滑菜单内容 --> <fragment android:id="@+id/navigation_drawer" android:name="com.example.cg.eventbuslearn.untils.tool_NavigationDrawerFragment" android:layout_width="@dimen/navigationWidth" android:layout_height="match_parent" android:layout_gravity="start" /></android.support.v4.widget.DrawerLayout>
toolbar.xml toolbar布局
<?xml version="1.0" encoding="utf-8"?><android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="?attr/colorPrimary" android:minHeight="?attr/actionBarSize" app:popupTheme="@style/ThemeOverlay.AppCompat.Light" app:theme="@style/ThemeOverlay.AppCompat.ActionBar"></android.support.v7.widget.Toolbar>
fragment_main_drawer.xml DrawerLayout布局
<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white"> <LinearLayout android:id="@+id/linear_drawer_login" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="@color/white"> <LinearLayout android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="2" android:orientation="vertical" android:background="#3A5FCD"> <LinearLayout android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="3" android:gravity="center_vertical"> <com.example.cg.eventbuslearn.untils.CircleImageView android:id="@+id/img_userPic" android:layout_width="50dp" android:layout_height="50dp" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:src="@drawable/img_empty_followers" app:border_width="1dp" app:border_color="@color/white" /> </LinearLayout> <TextView android:id="@+id/txt_main_drawer_UserNick" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1" android:text="我本无名" android:textColor="@color/white" android:layout_marginLeft="10dp"/> <TextView android:id="@+id/txt_main_drawer_UserProfile" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1" android:text="码农" android:textSize="@dimen/main_drawer_small" android:textColor="@color/white" android:layout_marginTop="5dp" android:layout_marginLeft="10dp"/> </LinearLayout> <ListView android:id="@+id/lv_main_drawer_leftmenu" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="6" android:background="@color/white" android:choiceMode="singleChoice" android:layout_marginTop="5dp" android:divider="@null" android:scrollbars="none"/> <LinearLayout android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="2" android:background="@color/white" android:layout_marginTop="5dp" android:orientation="vertical"> <LinearLayout android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1"> <ImageView android:layout_width="fill_parent" android:layout_height="1dp" android:background="@color/grey" android:contentDescription="@string/Guide_fragment_img_Description"/> </LinearLayout> <LinearLayout android:id="@+id/linear_drawer_chanageStyle" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="4" android:background="@drawable/main_drawer_background" android:clickable="true" android:gravity="center_vertical"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginLeft="16dp" android:text="@string/navigation_Menu_changeStyle" android:textAppearance="?android:attr/textAppearanceListItemSmall" android:textColor="@drawable/main_drawer_text_color" /> </LinearLayout> <LinearLayout android:id="@+id/linear_drawer_setting" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="4" android:background="@drawable/main_drawer_background" android:clickable="true" android:gravity="center_vertical"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginLeft="16dp" android:text="@string/navigation_Menu_setting" android:textAppearance="?android:attr/textAppearanceListItemSmall" android:textColor="@drawable/main_drawer_text_color"/> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1" /> </LinearLayout> </LinearLayout></FrameLayout>
fragment_main_drawer_item.xml DrawerLayout中可点击菜单布局
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp" android:gravity="center_vertical" android:background="@drawable/main_drawer_background" android:orientation="horizontal"> <ImageView android:id="@+id/item_icon" android:layout_marginRight="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <TextView android:id="@+id/item_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceListItemSmall" android:textColor="@drawable/main_drawer_text_color" android:gravity="center_vertical" /></LinearLayout>
tool_NavigationDrawerFragment.java
package com.example.cg.eventbuslearn.untils;import android.app.Fragment;import android.content.res.TypedArray;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import com.example.cg.eventbuslearn.Adapter.Main_Drawer_lv_Adapter;import com.example.cg.eventbuslearn.R;import com.example.cg.eventbuslearn.bean.MainDrawerMenu;import java.util.ArrayList;import java.util.List;import de.greenrobot.event.EventBus;/** * 左侧侧滑菜单的fragment * Created by cg on 2015/8/26. */public class tool_NavigationDrawerFragment extends Fragment implements View.OnClickListener { private ListView lv_main_drawer_leftmenu; //定义菜单的listView private List<MainDrawerMenu> list_menu; private LinearLayout linear_drawer_login; //定义用户登录之后的页面布局 private LinearLayout linear_drawer_noLogin; //定义用户未登录之后的页面布局 private TextView txt_drawer_nologin_login; //定义登录注册按钮 private CircleImageView img_userPic; //用户图片 private TextView txt_main_drawer_UserNick; //用户姓名 private TextView txt_main_drawer_UserProfile; //用户简介 private LinearLayout linear_drawer_chanageStyle; //切换主题 private LinearLayout linear_drawer_setting; //设置 private LinearLayout linear_drawer_nostyle; private LinearLayout linear_drawer_nosetting; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_main_drawer,container,false); return view; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //EventBus.getDefault().register(this); } @Override public void onDestroy() { super.onDestroy(); //EventBus.getDefault().unregister(this); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); lv_main_drawer_leftmenu = (ListView)view.findViewById(R.id.lv_main_drawer_leftmenu); list_menu = getMenuItem(); lv_main_drawer_leftmenu.setAdapter(new Main_Drawer_lv_Adapter(getActivity(), list_menu)); lv_main_drawer_leftmenu.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { EventBus.getDefault().post(list_menu.get(position).getMainDrawer_menuName()); } }); linear_drawer_login = (LinearLayout)view.findViewById(R.id.linear_drawer_login); img_userPic = (CircleImageView)view.findViewById(R.id.img_userPic); txt_main_drawer_UserNick = (TextView)view.findViewById(R.id.txt_main_drawer_UserNick); txt_main_drawer_UserProfile = (TextView)view.findViewById(R.id.txt_main_drawer_UserProfile); linear_drawer_chanageStyle = (LinearLayout)view.findViewById(R.id.linear_drawer_chanageStyle); linear_drawer_chanageStyle.setOnClickListener(this); linear_drawer_setting = (LinearLayout)view.findViewById(R.id.linear_drawer_setting); linear_drawer_setting.setOnClickListener(this); } /** * 从arrays.xml中取出数据，装入list<T>中 * @return 返回菜单名称列表 */ private List<MainDrawerMenu> getMenuItem() { List<MainDrawerMenu> list_menu = new ArrayList<MainDrawerMenu>(); String[] itemTitle = getResources().getStringArray(R.array.item_title); TypedArray itemIconRes = getResources().obtainTypedArray(R.array.item_icon_res); for(int i=0;i<itemTitle.length;i++) { MainDrawerMenu lmi = new MainDrawerMenu(); lmi.setMainDrawer_icon(itemIconRes.getResourceId(i,0)); lmi.setMainDrawer_menuName(itemTitle[i]); list_menu.add(lmi); } return list_menu; } @Override public void onClick(View v) { switch (v.getId()) { case R.id.linear_drawer_chanageStyle: break; case R.id.linear_drawer_setting: break; } }}主程序 FragmentToFragmentActivity.java
package com.example.cg.eventbuslearn;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.support.v4.widget.DrawerLayout;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.widget.Toast;import de.greenrobot.event.EventBus;/** * 实现的是左侧Fragment点击事件，主页面得到 * 这里注意一点的是,因为我们的布局，左侧侧滑布局也是在主页面当中的，所以在tool_NavigationDrawerFragment.java不要进行注册。直接在此页注册就OK了 */public class FragmentToFragmentActivity extends AppCompatActivity { private Toolbar toolbar; //定义toolbar private DrawerLayout drawer_main; //定义左侧滑动布局，其实就是主布局 private ftf_IndexFragment iFragment; private ftf_FindFragment fFragment; private ftf_AttentionFragment aFragment; private ftf_CollectionFragment cFragment; private ftf_DraftFragment dFragment; private Fragment isFragment; //记录当前正在使用的fragment /** * 供其它页面调用 * @param context 上下文 */ public static void FragmentToFragmentStart(Context context) { Intent intent = new Intent(context,FragmentToFragmentActivity.class); context.startActivity(intent); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fragment_to_fragment); EventBus.getDefault().register(this); toolbar = (Toolbar) this.findViewById(R.id.toolbar); toolbar.setTitle("Fragment之间的传值"); setSupportActionBar(toolbar); //为了生成，工具栏左上角的动态图标，要使用下面的方法 drawer_main = (DrawerLayout) findViewById(R.id.drawer_main); initFragment(savedInstanceState); } @Override protected void onDestroy() { super.onDestroy(); EventBus.getDefault().unregister(this); } /** * 当fragment进行切换时，采用隐藏与显示的方法加载fragment以防止数据的重复加载 * @param from * @param to */ public void switchContent(Fragment from, Fragment to) { if (isFragment != to) { isFragment = to; FragmentManager fm = getSupportFragmentManager(); //添加渐隐渐现的动画 FragmentTransaction ft = fm.beginTransaction();//.setCustomAnimations( // android.R.animator.fade_in, android.R.animator.fade_out); //FragmentTransaction ft = fm.beginTransaction().setCustomAnimations(R.anim.in_from_right_fragment,R.anim.out_to_left_fragment); if (!to.isAdded()) { // 先判断是否被add过 ft.hide(from).add(R.id.frame_main, to).commit(); // 隐藏当前的fragment，add下一个到Activity中 } else { ft.hide(from).show(to).commit(); // 隐藏当前的fragment，显示下一个 } } } /** * 为页面加载初始状态的fragment */ public void initFragment(Bundle savedInstanceState) { //判断activity是否重建，如果不是，则不需要重新建立fragment. if(savedInstanceState==null) { FragmentManager fm = getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); if (iFragment == null) { iFragment = new ftf_IndexFragment(); } isFragment = iFragment; ft.replace(R.id.frame_main, iFragment).commit(); } } public void onEventMainThread(String menuName) { FragmentManager fm = getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); switch (menuName) { case "首页" : if(iFragment!=null) { iFragment = new ftf_IndexFragment(); } switchContent(isFragment,iFragment); break; case "发现" : if(fFragment==null) { fFragment = new ftf_FindFragment(); } switchContent(isFragment,fFragment); break; case "关注" : if(aFragment==null) { aFragment = new ftf_AttentionFragment(); } switchContent(isFragment,aFragment); break; case "收藏" : if(cFragment==null) { cFragment = new ftf_CollectionFragment(); } switchContent(isFragment,cFragment); break; case "草稿" : if(dFragment==null) { dFragment = new ftf_DraftFragment(); } switchContent(isFragment,dFragment); break; case "提问" : break; case "切换主题": Toast.makeText(this, "对不起，无样式可以切换", Toast.LENGTH_SHORT).show(); break; case "设置": break; } invalidateOptionsMenu(); /** * 关闭左侧滑出菜单 */ drawer_main.closeDrawers(); }} 0 0
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