分享程序员开发的那些事...
更新时间：2022-09-27 18:34:34
今天写了个示例代码，就是使用Actionbar类实现顶部标签切换功能。如果所示。
使用最新的adt工具，创建项目的时候都会带一个android-support-v7-appcompat的类库项目，
这个libproject中有我们要用的ActionBar，可以适配2.1的Android系统。
废话不多说，直接上代码。
1、修改activity_main.xml，增加ViewPager。
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<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
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2、修改MainActivity中的代码，让其继承ActionBarActivity
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public class MainActivity extends ActionBarActivity implements TabListener {
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3、创建TabsPagerAdapter继承FragmentPagerAdapter
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package com.example.tabswithswie.adatper;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import com.example.tabswithswie.fragments.AppFragment;
import com.example.tabswithswie.fragments.GamesFragment;
import com.example.tabswithswie.fragments.MoviesFragment;
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
@Override
public Fragment getItem(int index) {
switch (index) {
case 0:
return new AppFragment();
case 1:
return new GamesFragment();
case 2:
return new MoviesFragment();
}
return null;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 3;
}
} |
4、创建AppFragment继承android.support.v4.app.Fragment
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package com.example.tabswithswie.fragments;
import com.example.tabswithswie.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class AppFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.fragment_app, container, false);
}
} |
5、创建布局文件fragment_app.xml
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#43ff00ff" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_centerInParent="true"
android:text="这个是应用界面"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
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6、创建GamesFragment继承android.support.v4.app.Fragment
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package com.example.tabswithswie.fragments;
import com.example.tabswithswie.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class GamesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.fragment_game, container, false);
}
} |
7、创建布局文件fragment_game.xml
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" android:background="#9445f353">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_centerInParent="true"
android:text="游戏"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
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8、创建MoviesFragment继承android.support.v4.app.Fragment
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package com.example.tabswithswie.fragments;
import com.example.tabswithswie.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MoviesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.fragment_movie, container, false);
}
} |
9、创建布局文件fragment_movie.xml
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#34fef443" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_centerInParent="true"
android:text="视频"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
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10、回到 MainActivity类，添加Tabs到ActionBar中，并处理点击滑动事件。完整代码
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package com.example.tabswithswie;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBar.Tab;
import android.support.v7.app.ActionBar.TabListener;
import android.support.v7.app.ActionBarActivity;
import com.example.tabswithswie.adatper.TabsPagerAdapter;
public class MainActivity extends ActionBarActivity implements TabListener {
private ViewPager viewPager;
private ActionBar actionBar;
private TabsPagerAdapter mTabsPagerAdapter;
private String[] tabs ={"应用","游戏","视频"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取viewpager
viewPager = (ViewPager) findViewById(R.id.pager);
//实例化pageradapter
mTabsPagerAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mTabsPagerAdapter);
//获取适配的actionbar
actionBar = getSupportActionBar();
//设置home按钮不可点击
actionBar.setHomeButtonEnabled(false);
//设置顶部导航的模式 -tabs
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//添加标签
for(String tab:tabs)
{
actionBar.addTab(actionBar.newTab().setText(tab).setTabListener(this));
}
//设置ViewPager切换时候的监听事件
viewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
//页面滑动，顶部标签跟着改变
actionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
}
@Override
public void onTabReselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction fragmentTransaction) {
//tab选中，切换viewpager
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
} |
代码就是这样的，搞定收工了。
本文转自xuzw13 51CTO博客，原文链接：http://blog.51cto.com/xuzhiwei/1533803，如需转载请自行联系原作者
