选项卡切换

<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"
android:orientation="vertical"
tools:context=".MainActivity" >

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<TextView
android:gravity="center"
android:id="@+id/tab1"
android:layout_weight="1"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:text="社会新闻"
/>
<TextView
android:gravity="center"
android:id="@+id/tab2"
android:layout_weight="1"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:text="生活新闻"
/>
<TextView
android:gravity="center"
android:id="@+id/tab3"
android:layout_weight="1"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:text="军事新闻"
/>
<TextView
android:gravity="center"
android:id="@+id/tab4"
android:layout_weight="1"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:text="娱乐新闻"
/>
</LinearLayout>
<LinearLayout
android:id="@+id/content"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:gravity="center"
>

</LinearLayout>

</LinearLayout>

<?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:gravity="center"
android:orientation="vertical" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="生活新闻" />

</LinearLayout>

package com.itheimazyh.changeui;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.graphics.Color;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {
private TextView tv1,tv2,tv3,tv4;
private List<TextView> tvList;
private FragmentManager fm;
private FragmentTransaction ft;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

tv1 = (TextView) findViewById(R.id.tab1);
tv2 = (TextView) findViewById(R.id.tab2);
tv3 = (TextView) findViewById(R.id.tab3);
tv4 = (TextView) findViewById(R.id.tab4);

tvList = new ArrayList<TextView>();
tvList.add(tv1);
tvList.add(tv2);
tvList.add(tv3);
tvList.add(tv4);

tv1.setBackgroundColor(Color.BLUE);
fm = getFragmentManager();
ft = fm.beginTransaction();
ft.replace(R.id.content, new Fragment1());
ft.commit();

tv1.setOnClickListener(this);
tv2.setOnClickListener(this);
tv3.setOnClickListener(this);
tv4.setOnClickListener(this);
}
@Override
public void onClick(View v) {
for(TextView tv : tvList){
tv.setBackgroundColor(Color.WHITE);
}
ft = fm.beginTransaction();

switch(v.getId()){
case R.id.tab1:
tv1.setBackgroundColor(Color.BLUE);
ft.replace(R.id.content, new Fragment1());
break;
case R.id.tab2:
tv2.setBackgroundColor(Color.BLUE);
ft.replace(R.id.content, new Fragment2());
break;
case R.id.tab3:
tv3.setBackgroundColor(Color.BLUE);
ft.replace(R.id.content, new Fragment3());
break;
case R.id.tab4:
tv4.setBackgroundColor(Color.BLUE);
ft.replace(R.id.content, new Fragment4());
break;
}
ft.commit();

}

}

package com.example.myfragment3;

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

public class Fragment1 extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.fragment1, null);
}

}