基于Android Fragment功能的例子
通过最近空闲时候对Fragment的学习，尝试着写了一个小Demo，将在开发的时候能常用到的Fragment知识放在一起，写过了这个Demo对Android Fragment的了解更加深入了，以后做起有关的项目也会顺手很多，下面先贴上几张实现之后的图片：
实现的功能很简单，也是最基本的，上下分别是两个Fragment，上面的Fragment中是一个listview，当点击item时，下面的Fragment显示对应的文字详细信息：
具体的实现步骤如下：
①创建工程FragmentExam，目录视图如下(把之前的FragmentPreference的demo也加到了一起)：
②main.xml文件布局，垂直方向上两个Fragment，用<Fragment>标签声明
<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=".MainActivity" android:orientation="vertical" android:background="#7ecef4"><fragment android:name="com.example.fragementexam.FragementList" android:id="@+id/frag_list" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="2"/><fragment android:name="com.example.fragementexam.FragementDetails" android:id="@+id/frag_detail" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1"/></LinearLayout>
③FragmentList.java的代码,它继承了ListFragment，注意在onCreateView方法中使用inflater的inflate方法将布局页面引进：
package com.example.fragementexam;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.ListFragment;import android.os.Bundle;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ListView;import android.widget.SimpleAdapter;public class FragementList extends ListFragment {private String[] values = new String[] { "侏儒", "人类", "暗夜精灵", "矮人", "德莱尼","狼人" };private int[] images = new int[] { R.drawable.gnome,R.drawable.human, R.drawable.nightelf,R.drawable.dwarf, R.drawable.draenei,R.drawable.werewolf };@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {return inflater.inflate(R.layout.frag_list, container, false);}@Overridepublic void onActivityCreated(Bundle savedInstanceState) {super.onActivityCreated(savedInstanceState);List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();for (int i = 0; i < values.length; i++) {Map<String, Object> listItem = new HashMap<String, Object>();listItem.put("values", values[i]);listItem.put("images", images[i]);listItems.add(listItem);}SimpleAdapter adapter = new SimpleAdapter(getActivity(), listItems,R.layout.list_item, new String[] { "values", "images" },new int[] { R.id.txt_title, R.id.img });setListAdapter(adapter);}@Overridepublic void onListItemClick(ListView l, View v, int position, long id) {// String item = (String) getListAdapter().getItem(position);FragementDetails frag = (FragementDetails) getFragmentManager().findFragmentById(R.id.frag_detail);if (frag != null && frag.isInLayout()) {switch (position) {case 0:frag.setText(getString(R.string.Gnome));break;case 1:frag.setText(getString(R.string.Human));break;case 2:frag.setText(getString(R.string.NightElf));break;case 3:frag.setText(getString(R.string.Dwarf));break;case 4:frag.setText(getString(R.string.Draenei));break;case 5:frag.setText(getString(R.string.Werewolf));break;}}Log.i("PDA", "position = " + position);}}
④FragementDetails.java的代码，这个比较简单，里面有一个设置TextView内容的方法，其布局页面也仅仅是一个TextView
package com.example.fragementexam;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;public class FragementDetails extends Fragment {@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubreturn inflater.inflate(R.layout.frag_detail, container,false);}public void setText(String item){TextView txt = (TextView) getView().findViewById(R.id.txt_detail);txt.setText(item);}}