Android FragMent 小实例

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android中的fragment是运行在activity中的,其生命周期是依赖activity的,他可以被重用,使平板电脑的大空间得以合理利用,下面给个小例子。
首先是主activity

package com.example.fragmenttest;

import android.os.Bundle;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.view.View;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      setContentView(R.layout.activity_main);
	}
	 
	public void selectFrag(View view) {
		 Fragment fr;
		 
		 if(view == findViewById(R.id.button2)) {
			 fr = new FragmentTwo();
		 
		 }else {
			 fr = new FragmentOne();
		 }
		 
		 FragmentManager fm = getFragmentManager();
	     FragmentTransaction fragmentTransaction = fm.beginTransaction();
	     fragmentTransaction.replace(R.id.fragment_place, fr);
	     fragmentTransaction.commit();
		 
	}
   
}

主布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
  <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Fragment No.1"
        android:onClick="selectFrag" />

     <Button
         android:id="@+id/button2"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:onClick="selectFrag"
         android:text="Fragment No.2" /> 

   <fragment
        android:name="com.example.fragmenttest.FragmentOne"
        android:id="@+id/fragment_place"
   		android:layout_width="match_parent"
   		android:layout_height="match_parent" />
    
</LinearLayout>

本实例中有两个fragment,第一个的class文件

/**
 * 
 */
package com.example.fragmenttest;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * @author 学平
 *
 */
public class FragmentOne extends Fragment {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
//		return super.onCreateView(inflater, container, savedInstanceState);
		return inflater.inflate(R.layout.fragment_one, container, false);
	}

	@Override
	public void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
	}

}

第二个fragment的class文件

/**
 * 
 */
package com.example.fragmenttest;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * @author 学平
 *
 */
public class FragmentTwo extends Fragment {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
//		return super.onCreateView(inflater, container, savedInstanceState);
		return inflater.inflate(R.layout.fragment_two, container, false);
	}

	@Override
	public void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
	}

}

两个fragment的layout的布局文件,fragment_one.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent" 
   android:orientation="vertical"
   android:background="#00ffff">

       <TextView
           android:id="@+id/textView1"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:layout_weight="1"
           android:text="This is fragment No.1"
           android:textStyle="bold" />

</LinearLayout>

fragment_two.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent" 
   android:orientation="vertical"
   android:background="#ffff00">

       <TextView
           android:id="@+id/textView2"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:text="This is fragment No.2"
           android:textStyle="bold" />

</LinearLayout>


源码的下载路径 http://pan.baidu.com/s/1i381fSh

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