Android入门之ActionBar实现Tab导航

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="jk.actionbartab"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="17" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="jk.actionbartab.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="action_settings">Settings</string>
<string name="app_name">Tab导航</string>
<string name="title_activity_main">ActionBar的Tab导航</string>
<string name="personal_page">个人</string>
<string name="query_page">查询</string>
<string name="pay_page">支付</string>

</resources>

package jk.actionbartab;

import jk.actionbartab.R;
import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;

public class MainActivity extends Activity implements ActionBar.TabListener {
private static final String SELECTED_ITEM = "selected_item";

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ActionBar actionBar = getActionBar();
// 设置ActionBar的导航方式：Tab导航
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// 依次添加3个Tab页，并为3个Tab标签添加事件监听器
actionBar.addTab(actionBar.newTab().setText(R.string.personal_page)
.setTabListener(this));
actionBar.addTab(actionBar.newTab().setText(R.string.query_page)
.setTabListener(this));
actionBar.addTab(actionBar.newTab().setText(R.string.pay_page)
.setTabListener(this));
}

public void onRestoreInstanceState(Bundle savedInstanceState) {
if (savedInstanceState.containsKey(SELECTED_ITEM)) {
// 选中前面保存的索引对应的Fragment页
getActionBar().setSelectedNavigationItem(
savedInstanceState.getInt(SELECTED_ITEM));
}
}

public void onSaveInstanceState(Bundle outState) {
// 将当前选中的Fragment页的索引保存到Bundle中
outState.putInt(SELECTED_ITEM, getActionBar()
.getSelectedNavigationIndex());
}

public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}

// 当指定Tab被选中时激发该方法

public void onTabSelected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
// 创建一个新的Fragment对象
Fragment fragment = new DummyFragment();
// 创建一个Bundle对象，用于向Fragment传入参数
Bundle args = new Bundle();
args.putInt(DummyFragment.ARG_SECTION_NUMBER, tab.getPosition() + 1);
// 向fragment传入参数
fragment.setArguments(args);
// 获取FragmentTransaction对象
FragmentTransaction ft = getFragmentManager().beginTransaction();
// 使用fragment代替该Activity中的container组件
ft.replace(R.id.container, fragment);
// 提交事务
ft.commit();
}

public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
}

package jk.actionbartab;

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

public class DummyFragment extends Fragment {
public static final String ARG_SECTION_NUMBER = "section_number";

// 该方法的返回值就是该Fragment显示的View组件
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
TextView textView = new TextView(getActivity());
textView.setGravity(Gravity.CENTER_HORIZONTAL);
// 获取创建该Fragment时传入的参数Bundle
Bundle args = getArguments();
// 设置TextView显示的文本
textView.setText(args.getInt(ARG_SECTION_NUMBER) + "");
textView.setTextSize(30);
// 返回该TextView
return textView;
}
}