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Android Fragment功能的例子

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 };        @Override        public View onCreateView(LayoutInflater inflater, ViewGroup container,                        Bundle savedInstanceState) {                return inflater.inflate(R.layout.frag_list, container, false);        }        @Override        public 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);                        listItem.put("images", images);                        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);        }        @Override        public 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 {        @Override        public View onCreateView(LayoutInflater inflater, ViewGroup container,                        Bundle savedInstanceState) {                // TODO Auto-generated method stub                return 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);        }        }

其他的部分就是一些数组,String的定义了,这个demo虽然简单,却将Android Fragment方面常用到的做了一个综述,如果自己写明白了这个的话,今后遇到类似的项目应该要好应付的多

 

Android Fragment功能的例子