Android 导航栏如何轻松搞定

    APP市场中大多数新闻App都有导航菜单，导航菜单是一组标签的集合，在新闻客户端中，每个标签标示一个新闻类别，对应下面ViewPager控件的一个分页面，今日头条， 网易新闻等。

    话不多说直接先上原型图，如图1，图2，图3。

image image image

首先是新闻Fragment:

import java.io.File;

import java.nio.channels.Channel;

import java.util.ArrayList;

import java.util.Calendar;

import java.util.Date;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.json.JSONException;

import org.json.JSONObject;

import com.android.volley.Request;

import com.android.volley.RequestQueue;

import com.android.volley.Response;

import com.android.volley.VolleyError;

import com.android.volley.toolbox.ClearCacheRequest;

import com.android.volley.toolbox.DiskBasedCache;

import com.android.volley.toolbox.StringRequest;

import com.android.volley.toolbox.Volley;

import com.google.gson.Gson;

import com.google.gson.reflect.TypeToken;

import com.juronggvo.R;

import com.juronggvo.adapter.ExerciseAdapter;

import com.juronggvo.adapter.NewsAdapter;

import com.juronggvo.adapter.PageFragmentAdapter;

import com.juronggvo.bean.NewsBean;

import com.juronggvo.data.Config;

import com.juronggvo.data.Contants;

import com.juronggvo.data.GlobalData;

import com.juronggvo.ui.inform.InformActivity;

import com.juronggvo.ui.news.NewsActivity;

import com.juronggvo.utils.Utils;

import com.juronggvo.widget.MyListView;

import com.juronggvo.widget.NewsTitleTextView;

import com.juronggvo.widget.NewsViewPagerAdapter;

import com.juronggvo.widget.PullToRefreshView;

import com.juronggvo.widget.PullToRefreshView.OnFooterRefreshListener;

import com.juronggvo.widget.PullToRefreshView.OnHeaderRefreshListener;

import android.R.bool;

import android.annotation.SuppressLint;

import android.content.Intent;

import android.graphics.Color;

import android.os.Bundle;

import android.os.Handler;

import android.provider.Settings.Global;

import android.support.v4.app.Fragment;

import android.support.v4.view.ViewPager;

import android.support.v4.view.ViewPager.LayoutParams;

import android.support.v4.view.ViewPager.OnPageChangeListener;

import android.util.DisplayMetrics;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.FrameLayout;

import android.widget.HorizontalScrollView;

import android.widget.LinearLayout;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.RelativeLayout;

import android.widget.TextView;

import android.widget.Toast;

/**

* 新闻资讯

* @description

* @data 2016年12月13日

* @author yang.yang

*/

public class NewsFragment extends Fragment implements OnPageChangeListener {

private RadioGroup rgChannel;

private View view;

private ViewPager viewPager;

private HorizontalScrollView hvChannel;

private PageFragmentAdapter adapter=null; 

private int page = 1 ;

private Object newsLists; 

 private ListfragmentList=new ArrayList();

private RequestQueue requestQueue =null;

private ExerciseAdapter newsAdapter;

private Handler handler = new Handler() ;

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

view = inflater.inflate(R.layout.fragment_new, container, false);

return view ;

}

@Override

public void onActivityCreated(Bundle savedInstanceState) {

super.onActivityCreated(savedInstanceState);

init() ;

setTab(Config.newsPosition,true);

}

private void init(){

requestQueue = Volley.newRequestQueue(getActivity());

rgChannel=(RadioGroup)view.findViewById(R.id.rgChannel);

viewPager=(ViewPager)view.findViewById(R.id.vpNewsList);

hvChannel=(HorizontalScrollView)view.findViewById(R.id.hvChannel);

rgChannel.setOnCheckedChangeListener(

new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group,

int checkedId) {

viewPager.setCurrentItem(checkedId);

}

});

viewPager.setOnPageChangeListener(this);

initTab();//动态产生RadioButton

initViewPager();

}

private void initTab(){ 

ListchannelList=ChannelDb.getSelectedChannel();

for(int i=0;i<channelList.size();i++){

RadioButton rb=(RadioButton)LayoutInflater.from(getActivity()).

inflate(R.layout.tab_rb, null);

rb.setId(i);

rb.setText(channelList.get(i));

RadioGroup.LayoutParams params=new

RadioGroup.LayoutParams(RadioGroup.LayoutParams.WRAP_CONTENT,

RadioGroup.LayoutParams.WRAP_CONTENT);

rgChannel.addView(rb,params);

}

}

private void initViewPager(){

adapter=new PageFragmentAdapter(super.getFragmentManager());

viewPager.setAdapter(adapter);

viewPager.setOffscreenPageLimit(0);

}

/**

* 滑动ViewPager时调整ScroollView的位置以便显示按钮

* @param idx

*/

private void setTab(final int idx,boolean flag){

RadioButton rb=(RadioButton)rgChannel.getChildAt(idx);

rb.setChecked(true);

int left=rb.getLeft();

int width=rb.getMeasuredWidth();

DisplayMetrics metrics=new DisplayMetrics();

super.getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);

int screenWidth=metrics.widthPixels;

final int len=left+width/2-screenWidth/2;

hvChannel.smoothScrollTo(len, 0);//滑动ScroollView

System.out.println("len====="+len);

}

@Override

public void onPageScrollStateChanged(int arg0) {

// TODO Auto-generated method stub

}

@Override

public void onPageScrolled(int arg0, float arg1, int arg2) {

// TODO Auto-generated method stub

}

@Override

public void onPageSelected(int position) {

// TODO Auto-generated method stub

setTab(position,false);

}

｝

其中要用的fragment_new.xml

image image

ChannelDb 类

import java.nio.channels.Channel;

import java.util.ArrayList;

import java.util.List;

public class ChannelDb {

private static ListselectedChannel=new ArrayList();

static{

selectedChannel.add("热点资讯");

selectedChannel.add("开发区概括");

selectedChannel.add("最新动态");

selectedChannel.add("文化生活");

selectedChannel.add("旅游景点");

selectedChannel.add("句容资讯");

selectedChannel.add("党建园地");

selectedChannel.add("重点工程");

}

public static  ListgetSelectedChannel(){

return selectedChannel;

}

}

tab_rb.xml

image

PageFragmentAdapter 类

import java.util.List;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentPagerAdapter;

public class PageFragmentAdapter  extends FragmentPagerAdapter{

private String[] tabs  = { "热点资讯", "开发区概括","最新动态","文化生活","旅游景点","句容资讯","党建园地","重点工程" };

private FragmentManager fm;

public PageFragmentAdapter(FragmentManager fm ){

super(fm);

this.fm=fm;

}

/**

* 返回每页对应的fragment的对象

*/

@Override

public Fragment getItem(int position) {

return NewsFragmentFactory.create(position);

}

@Override

public int getCount() {

return tabs.length;

}

@Override

public int getItemPosition(Object object) {

return POSITION_NONE;  //没有找到child要求重新加载

}

}

NewsFragmentFactory类

import com.juronggvo.ui.fragment.ApplyCarFragment;

import com.juronggvo.ui.fragment.ApplyMeetingFragment;

import com.juronggvo.ui.fragment.CulLifeFragment;

import com.juronggvo.ui.fragment.DevoAreFragment;

import com.juronggvo.ui.fragment.HotpointFragment;

import com.juronggvo.ui.fragment.ImportantProFragment;

import com.juronggvo.ui.fragment.JuRongFragment;

import com.juronggvo.ui.fragment.NewRecentFragment;

import com.juronggvo.ui.fragment.PartyBuildFragment;

import com.juronggvo.ui.fragment.TravelFragment;

import android.support.v4.app.Fragment;

public class NewsFragmentFactory {

/**

* 根据不同的position生产对应的fragment对象

* @param position

* @return

*/

public static Fragment create(int position){

Fragment fragment = null;

switch (position) {

case 0:

fragment = new HotpointFragment();

break;

case 1:

fragment = new DevoAreFragment();

break;

case 2:

fragment = new NewRecentFragment();

break;

case 3:

fragment = new CulLifeFragment();

break;

case 4:

fragment = new TravelFragment();

break;

case 5:

fragment = new JuRongFragment();

break;

case 6:

fragment = new PartyBuildFragment();

break;

case 7:

fragment = new ImportantProFragment();

break;

}

return fragment;

}

}

然后在每个pager页面写你自己要的数据 就可以了。

伟大的哲学家我自己曾经说过，有梦想就要大声说出来 ，万丈高楼平地起，能不能行靠自己！