Android Fragment功能的例子

2022-01-30 02:26:10

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=""/>

        <fragment

            android:name="com.example.fragementexam.FragementDetails"

            android:id="@+id/frag_detail"

            android:layout_width="fill_parent"

            android:layout_height="0dp"

            android:layout_weight=""/>

</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 = ; 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 :

                                frag.setText(getString(R.string.Gnome));

                                break;

                        case :

                                frag.setText(getString(R.string.Human));

                                break;

                        case :

                                frag.setText(getString(R.string.NightElf));

                                break;

                        case :

                                frag.setText(getString(R.string.Dwarf));

                                break;

                        case :

                                frag.setText(getString(R.string.Draenei));

                                break;

                        case :

                                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

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