基于Android Fragment功能的样例

    通过近期空暇时候对Fragment的学习，尝试着写了一个小Demo，将在开发的时候能经常使用到的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非常多，以下先贴上几张实现之后的图片：

实现的功能非常easy，也是最主要的，上下各自是两个Fragment，上面的Fragment中是一个listview，当点击item时，以下的Fragment显示相应的文字具体信息：

详细的实现过程例如以下：

①创建projectFragmentExam，文件夹视图例如以下(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，这个比較简单，里面有一个设置TextView内容的方法，其布局页面也不过一个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);
	}

	
}