【Android】android Fragment的使用

Fragment使用很简单，注意android3.0之前版本的使用方法，下面是android4.0以上的方法。

上图是应用效果，效果就是当点击上面的listview时，底部textview进行更新。
控件布局：上面是一个listview，下面就是一个textview，不过他们各自都是一个Fragment。看主界面布局xml，分别是两个Fragment，MainActivity直接加载布局xml就行，不需要其他的。

<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.fragmenttest.FragmentList"        android:id="@+id/frag_list"        android:layout_width="fill_parent"        android:layout_height="0dp"        android:layout_weight="2"/>    <fragment         android:name="com.example.fragmenttest.FragmentDetails"        android:id="@+id/frag_detail"        android:layout_width="fill_parent"        android:layout_height="0dp"        android:layout_weight="1"/></LinearLayout>

接着是FragmentDetails.java和FragmentList.java

package com.example.fragmenttest;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 FragmentList 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.gnome, R.drawable.gnome,            R.drawable.gnome, R.drawable.gnome,            R.drawable.gnome };    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.frag_list, container, false);//需要注意的就是继承ListFragment的类的布局文件中listview的id一定要为list    }    @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);        FragmentDetails frag = (FragmentDetails) 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);    }}

package com.example.fragmenttest;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 FragmentDetails extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        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);    }}