Android之Fragment静态实现实例


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

[html]
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<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>

<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：

[java]
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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);
}

}

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

[java]
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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); } }

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