android之fragment征程

通過最近空閒時候對Fragment的學習，嘗試着寫了一個小Demo，將在開發的時候能常用到的Fragment知識放在一起，寫過了這個Demo對Android Fragment的瞭解更加深入了，以後做起有關的項目也會順手很多，下面先貼上幾張實現之後的圖片：

實現的功能很簡單，也是最基本的，上下分別是兩個Fragment，上面的Fragment中是一個listview，當點擊item時，下面的Fragment顯示對應的文字詳細信息：

具體的實現步驟如下：

①創建工程FragmentExam，目錄視圖如下(把之前的FragmentPreference的demo也加到了一起)：

②main.xml文件佈局，垂直方向上兩個Fragment，用<Fragment>標籤聲明

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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的代碼,它繼承了ListFragment，注意在onCreateView方法中使用inflater的inflate方法將佈局頁面引進：

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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", "人類", "暗夜精靈", "矮人", "德萊尼",
"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", "人類", "暗夜精靈", "矮人", "德萊尼",
			"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的代碼，這個比較簡單，裏面有一個設置TextView內容的方法，其佈局頁面也僅僅是一個TextView

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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數組，String的定義了，這個demo雖然簡單，卻將Android Fragment方面常用到的做了一個綜述，如果自己寫明白了這個的話，今後遇到類似的項目應該要好應付的多，好了，收工！

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