ViewPageIndicator + ViewPager + Fragment实现类似网易新闻客户端Tab标签
最近生病,脑子不太清楚,今天一哥们问我一个问题,也没搞明白他在问什么,后来明白之后我还以为脑子烧坏了呢,记下问题所在,共分享
这哥们看着夏神的博客写的,附上地址:http://blog.csdn.net/xiaanming/article/details/10766053,他想使用大神博客中说的ViewPageIndicator框架,但是大神继承的是FragmentActivity,这哥们的继承自Fragment,可能是不太明白,具体他的问题出现在哪里,我没有他的代码,我也不清楚
开始正题:
1,要想使用ViewPageIndicator框架,需要先从github上下载源码,源码地址:https://github.com/JakeWharton/Android-ViewPagerIndicator,把library引入项目中
2.由于这哥们需要的是继承fragment的,所以就按照他的需求写的demo
翠花不上菜,只上代码:
package com.sdufe.thea.guo;
import com.sdufe.thea.guo.fragment.IndexFragment;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.Window;
import android.widget.LinearLayout;
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
getSupportFragmentManager().beginTransaction()
.add(R.id.ll, new IndexFragment()).commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
上面的代码就是在activity里面放入一个fragment,很简单啦,就不解释了.
下面主要就是对于框架的使用了:
package com.sdufe.thea.guo.fragment;
import com.sdufe.thea.guo.R;
import com.sdufe.thea.guo.adapter.TabPageIndicatorAdapter;
import com.viewpagerindicator.TabPageIndicator;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
public class IndexFragment extends Fragment {
private static String[] title = { "呵呵", "哈哈", "嘿嘿", "嗷嗷" };
private ViewPager viewPager;
private TabPageIndicator indicator;
private TabPageIndicatorAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_index, null);
viewPager = (ViewPager) view.findViewById(R.id.pager);
indicator = (TabPageIndicator) view.findViewById(R.id.indicator);
adapter = new TabPageIndicatorAdapter(getFragmentManager(), title);
viewPager.setAdapter(adapter);
indicator.setViewPager(viewPager);
indicator.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
Toast.makeText(getActivity(), title[arg0], Toast.LENGTH_LONG)
.show();
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
return view;
}
}
用起来很简单,毕竟都是大神们写的框架,方便我们小菜们使用,主要思路就是初始化viewPager和TabPageIndicator,给viewpager设置适配器.TabPageIndicator跟随viewPager一起滑动,顺便为其设置监听
下面贴一下适配器的代码:
package com.sdufe.thea.guo.adapter;
import com.sdufe.thea.guo.fragment.ItemFragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class TabPageIndicatorAdapter extends FragmentPagerAdapter {
private String[] title;
public TabPageIndicatorAdapter(FragmentManager fm, String[] title) {
super(fm);
this.title = title;
}
@Override
public Fragment getItem(int arg0) {
Fragment fragment=new ItemFragment();
Bundle bundle=new Bundle();
bundle.putString("arg", title[arg0]);
fragment.setArguments(bundle);
return fragment;
}
@Override
public int getCount() {
return title.length;
}
@Override
public CharSequence getPageTitle(int position) {
return title[position%title.length];
}
}
看着很熟悉吧,前面一片文章已经写过viewPager的使用了,这里主要说一下getPageTitle(int position)这个函数,如果你不重写这个函数,tab中就不会出现设置的文字,要想文字出现,必须要重写这个函数
当然如果上面写的内容你全部敲完了也就是能实现滑动,那天跟着跑的线,样式什么的都没有,下面你需要继续敲,这里是通过改变主题来设置的
<style name="CustomTabPageIndicator" parent="Widget.TabPageIndicator">
<item name="android:background">@drawable/tab_indicator</item>
<item name="android:textAppearance">@style/CustomTabPageIndicator.Text</item>
<item name="android:textSize">14sp</item>
<item name="android:dividerPadding">8dp</item>
<item name="android:showDividers">middle</item>
<item name="android:paddingLeft">10dp</item>
<item name="android:paddingRight">10dp</item>
<item name="android:fadingEdge">horizontal</item>
<item name="android:fadingEdgeLength">8dp</item>
</style>
<style name="CustomTabPageIndicator.Text" parent="android:TextAppearance.Medium">
<item name="android:typeface">monospace</item>
<item name="android:textColor">@drawable/selector_tabtext</item>
</style>
这里主要就是对背景的设置,对背景的设置,是通过选择器实现的
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@android:color/transparent" android:state_pressed="false" android:state_selected="false"></item>
<item android:drawable="@android:color/transparent" android:state_pressed="true" android:state_selected="false"></item>
<item android:drawable="@drawable/base_tabpager_indicator_selected" android:state_pressed="false" android:state_selected="true"></item>
<item android:drawable="@drawable/base_tabpager_indicator_selected" android:state_pressed="true" android:state_selected="true"></item>
</selector>
这样就能实现你想要的滑动了,主要要改变配置文件中的主题(application中的主题作用于整个app,不是只针对于某个acticity)
注:代码是通过夏神代码改编,开始已附上地址
代码下载地址:http://download.csdn.net/detail/elinavampire/8171355
...................................................................................简单看一下源代码...............................................................................................................
首先看一下TabPageIndicator,继承自HorizontalScrollView,也就是说tab是可以实现横向滑屏
public class TabPageIndicator extends HorizontalScrollView implements PageIndicator
继续看里面的代码
private final OnClickListener mTabClickListener = new OnClickListener() {
public void onClick(View view) {
TabView tabView = (TabView)view;
final int oldSelected = mViewPager.getCurrentItem();
final int newSelected = tabView.getIndex();
mViewPager.setCurrentItem(newSelected);
if (oldSelected == newSelected && mTabReselectedListener != null) {
mTabReselectedListener.onTabReselected(newSelected);
}
}
};
也就是说它本身就实现了点击功能,它不仅仅是实现滑动,其余的就跟实现自定义控件的内容有些相似了
我们使用的方法中还有setViewPager(viewPager)和setOnPageChangeListener()方法,就简单看一下这部分代码
void setViewPager(ViewPager view);和 void setOnPageChangeListener(ViewPager.OnPageChangeListener listener);是接口PageIndicator的方法,TabPageIndicator在自己的类里面实现了接口里面的方法
@Override
public void setViewPager(ViewPager view) {
if (mViewPager == view) {
return;
}
if (mViewPager != null) {
mViewPager.setOnPageChangeListener(null);
}
final PagerAdapter adapter = view.getAdapter();
if (adapter == null) {
throw new IllegalStateException("ViewPager does not have adapter instance.");
}
mViewPager = view;
view.setOnPageChangeListener(this);
notifyDataSetChanged();
}
这个方法是为了Bind the indicator to a ViewPager.
@Override
public void setOnPageChangeListener(OnPageChangeListener listener) {
mListener = listener;
}
这个主要就是使用viewPager的监听事件了,其实TabPageIndicator就是一个自定义控件
ok,先到这
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作者：子墨_
来源：CSDN
原文：https://blog.csdn.net/ElinaVampire/article/details/41246779
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