android：使用fragment实现tab切换

1.设置MainActivity布局：

LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <FrameLayout        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"         android:id="@+id/container">    </FrameLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content" >                <Button            android:id="@+id/button1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="tab1"            android:layout_weight="1" />        <Button            android:id="@+id/button2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="tab2" />            </LinearLayout>

其中framelayout作为显示fragment的容器.两个按钮用来切换不同的fragment。

2.定义Fragment子类，需继承android.app.Fragment类

此次需注意，android.app.Fragment只支持api11以上的版本，如果要兼容低版本，需使用android.supportv4.app.Fragment类，并且用法也略有区别。

Fragment1.java:

public class Fragment1 extends Fragment {@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment1,container, false);}}

Fragment2.java:

public class Fragment2 extends Fragment {@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment2,container, false);}}

注意，在onCreateView方法中指定布局文件。布局文件此处略。
3.设置MainAcitivity

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.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.FrameLayout;public class MainActivity extends Activity {Button btn1;Button btn2;Fragment f1;Fragment f2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn1 = (Button) findViewById(R.id.button1);btn2 = (Button) findViewById(R.id.button2);btn1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubFragmentManager fm = getFragmentManager();FragmentTransaction transaction = fm.beginTransaction();if (f2!=null) {transaction.hide(f2);}if (f1==null) {f1= new Fragment1();transaction.add(R.id.container, f1);} else {transaction.show(f1);}transaction.commit();}});btn2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubFragmentManager fm = getFragmentManager();FragmentTransaction transaction = fm.beginTransaction();if (f1!=null) {transaction.hide(f1);}if (f2==null) {f2= new Fragment2();transaction.add(R.id.container, f2);} else {transaction.show(f2);}transaction.commit();}});}}

此处注意，需开启事物来管理fragment，并提交事物

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