標籤：
Android Fragment是Android4.0以上才有的；而FragmentActivity是為了相容4.0以下版本的Fragment使用的。
所以如果你想相容4.0以下Android版本使用Fragment的話，架構Activity需要繼承FragmentActivity，FragmentActivity這個類是在android.support.v4.app.FragmentActivity裡的。
下面介紹2種用法：
1、繼承Activity的。
（這個只針對4.0以上的Android平台使用Fragment）。
架構Activity：
package com.tandong.fragment;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 不相容4.0以下模式Fragment
*
* @author tandong
*
*/
public class Mt_Activity extends Activity implements OnClickListener {
private Button btn_first, btn_second;
private Fragment Fragment_first, Fragment_Second;
private FragmentTransaction fragmentTransaction;
private FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment);
initView();
Fragment_Second = new Fragment_Second();
fragmentManager = this.getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.main_fragment_layout, Fragment_Second,"second_Fragment");
fragmentTransaction.commit();
}
private void initView() {
btn_first = (Button) this.findViewById(R.id.btn_first);
btn_second = (Button) this.findViewById(R.id.btn_second);
btn_first.setOnClickListener(this);
btn_second.setOnClickListener(this);
}
@Override
public void onClick(View arg0) {
switch (arg0.getId()) {
case R.id.btn_first:
// 載入不同的Fragment
if (null == Fragment_first) {
Fragment_first = new Fragment_first();
}
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.main_fragment_layout, Fragment_first, "fist_Fragment");
fragmentTransaction.commit();
break;
case R.id.btn_second:
if (null == Fragment_first) {
Fragment_Second = new Fragment_Second();
}
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.main_fragment_layout, Fragment_Second, "second_Fragment");
fragmentTransaction.commit();
break;
default:
break;
}
}
}
Fragment代碼：
package com.tandong.fragment;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment_Second extends Fragment {
private View rootView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(container==null)
return null;
rootView = inflater.inflate(R.layout.fragment_two, container,false);
return rootView;
}
}
2.繼承FragmentActivity的（向下相容4.0以下版本使用Fragment，匯入的是android.support.v4包裡的內容）
架構Activity：
package com.tandong.fragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 相容4.0以下模式Fragment
*
* @author tandong
*
*/
public class Mt_Activity extends FragmentActivity implements OnClickListener {
private Button btn_first, btn_second;
private Fragment Fragment_first, Fragment_Second;
private FragmentTransaction fragmentTransaction;
private FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment);
initView();
Fragment_first = new Fragment_first();
fragmentManager = this.getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.main_fragment_layout, Fragment_first,"first_Fragment");
fragmentTransaction.commit();
}
private void initView() {
btn_first = (Button) this.findViewById(R.id.btn_first);
btn_second = (Button) this.findViewById(R.id.btn_second);
btn_first.setOnClickListener(this);
btn_second.setOnClickListener(this);
}
@Override
public void onClick(View arg0) {
switch (arg0.getId()) {
case R.id.btn_first:
// 載入不同的Fragment
if (null == Fragment_first) {
Fragment_first = new Fragment_first();
}
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.main_fragment_layout, Fragment_first, "fist_Fragment");
fragmentTransaction.commit();
break;
case R.id.btn_second:
if (null == Fragment_first) {
Fragment_Second = new Fragment_Second();
}
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.main_fragment_layout, Fragment_Second, "second_Fragment");
fragmentTransaction.commit();
break;
default:
break;
}
}
}
Fragment代碼：
package com.tandong.fragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment_first extends Fragment {
private View rootView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(container==null)
return null;
rootView = inflater.inflate(R.layout.fragment_first, container,false);
return rootView;
}
}
最後再說一句布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/top_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:orientation="horizontal" >
<Button
android:id="@+id/btn_one"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/top_bar_bg"
android:text="按鈕一" />
<Button
android:id="@+id/btn_two"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/top_bar_bg"
android:text="按鈕二" />
</LinearLayout>
<LinearLayout
android:id="@+id/fragment_replace_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/top_bar_layout"
android:background="#ff0000" >
</LinearLayout>
</RelativeLayout>
布局類似這種布局即可，並不是一定非要FrameLayout
Android Fragment和FragmentActivity區別和用法
