使用选项卡进行页面切换

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package com.example.ui1;import android.os.Bundle;import android.app.Activity;import android.app.TabActivity;import android.content.Intent;import android.view.Menu;import android.widget.TabHost;import android.widget.TabHost.TabSpec;public class MainActivity extends TabActivity {private TabHost tabHost;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tabHost=getTabHost();AddTabPage1();AddTabPage2();AddTabPage3();}private void AddTabPage1() {// TODO Auto-generated method stubIntent intent1=new Intent();intent1.setClass(this,Act1.class);TabSpec tabSpec=tabHost.newTabSpec("act1");tabSpec.setIndicator("",getResources().getDrawable(R.drawable.to));tabSpec.setContent(intent1);          tabHost.addTab(tabSpec);}private void AddTabPage2() {// TODO Auto-generated method stubIntent intent2=new Intent();intent2.setClass(this,Act2.class);TabSpec tabSpec=tabHost.newTabSpec("act2");tabSpec.setIndicator("",getResources().getDrawable(R.drawable.tt));tabSpec.setContent(intent2);          tabHost.addTab(tabSpec);}private void AddTabPage3() {// TODO Auto-generated method stubIntent intent3=new Intent();intent3.setClass(this,Act3.class);TabSpec tabSpec=tabHost.newTabSpec("act3");tabSpec.setIndicator("",getResources().getDrawable(R.drawable.t3));tabSpec.setContent(intent3);          tabHost.addTab(tabSpec);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

<?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" >    <TextView        android:id="@+id/textView2"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:background="@drawable/b"        android:text="第二个窗体" /></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:orientation="vertical" >    <TextView        android:id="@+id/textView3"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:background="@drawable/c"        android:text="第三个窗体" />    </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:orientation="vertical" >    <TextView        android:id="@+id/textView1"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:background="@drawable/a"        android:text="第一个窗体" /></LinearLayout>

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