基于Android Fragment功能的例子
原文网址:http://blog.csdn.net/eyu8874521/article/details/8252216
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 };
- @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[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);
- }
- @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,好了,收工!
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