HorizontalScrollView+ViewPager导航栏

最新推荐文章于 2019-07-23 20:31:34 发布

原创最新推荐文章于 2019-07-23 20:31:34 发布 · 331 阅读

CC 4.0 BY-SA版权

本文介绍了如何在Android应用中使用HorizontalScrollView与ViewPager结合创建导航栏。通过在Fragment中获取传递的数据，并利用AsyncTask进行后台数据加载，然后用Gson解析JSON数据，将数据展示在ListView中。

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//主页面

package fragment;

import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.example.lx123000.R;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;

import fage.MyFragment;
import fage.MyFragment01;
import fage.MyFragment02;

/**
* Created by Administrator on 2017/12/30/030.
*/

public class Fragment02 extends Fragment implements View.OnClickListener{

String path = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
private ViewPager vp;
private LinearLayout ll;
private HorizontalScrollView hs;
private String[] strings;
private List<TextView> al;
private ArrayList<Fragment> fragments = new ArrayList<>();
private MyFragment01 fragment01;
private MyFragment02 fragment02;

@Nullable
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment02, container, false);
vp = view.findViewById(R.id.vp);
ll = view.findViewById(R.id.ll);
hs = view.findViewById(R.id.hsv);
strings = new String[]{"头条", "娱乐", "科技", "信息", "八卦", "北京", "上海", "天津",
"重庆", "大大燕网"};
init();
for (int i = 0; i < 2; i++) {
MyFragment myFragment = new MyFragment();
//传值
Bundle bundle = new Bundle();
bundle.putString("title",path+(i+1));
myFragment.setArguments(bundle);
fragments.add(myFragment);
}
fragment01 = new MyFragment01();
fragment02 = new MyFragment02();
fragments.add(fragment01);
fragments.add(fragment02);

vp.setAdapter(new FragmentPagerAdapter(getActivity().getSupportFragmentManager()) {
@Override
public Fragment getItem(int position) {
return fragments.get(position);
}

@Override
public int getCount() {
return fragments.size();
}
});
into();

return view;
}

private void into() {
vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {
for (int i = 0; i < fragments.size(); i++) {
if (i == position) {
al.get(i).setTextColor(Color.RED);
}else{
al.get(i).setTextColor(Color.BLACK);
}
}
// int width = al.get(0).getWidth();
// hs.scrollTo((width+20)*position,0);
}

@Override
public void onPageScrollStateChanged(int state) {

}
});
}

private void init() {
al = new ArrayList<>();
for (int i = 0; i < strings.length; i++) {
TextView tv = new TextView(getActivity());
tv.setText(strings[i]);
tv.setTextSize(24);
if (i== 0) {
tv.setTextColor(Color.RED);
}
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(10,10,10,20);
tv.setId(i);
tv.setOnClickListener(this);
al.add(tv);
ll.addView(tv,layoutParams);
}
}

@Override
public void onClick(View view) {
int id = view.getId();
vp.setCurrentItem(id);
}

}

//接受数据页面

package fage;

import android.annotation.SuppressLint;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.TextView;

import com.example.lx123000.R;
import com.google.gson.Gson;

import java.util.List;

import adapter.MyAdapter;
import bean.SuperClass;
import url.GetURL;

/**
* Created by Administrator on 2018/1/3/003.
*/

public class MyFragment extends Fragment {

String path;
private ListView lv;
private TextView tv;
private List<SuperClass.DataBean> list;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.myfragment_item, container, false);

Bundle bundle = getArguments();
lv = view.findViewById(R.id.lv);
tv = view.findViewById(R.id.tv);
path=bundle.getString("title");
new AsyncTask<String, String, String>() {
@Override
protected String doInBackground(String... strings) {
String data = GetURL.getData(path);
return data;
}

@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Gson gson = new Gson();
SuperClass superClass = gson.fromJson(s, SuperClass.class);
list = superClass.getData();
lv.setAdapter(new MyAdapter(list,getActivity()));
}
}.execute();
return view;
}
}

//接受页面布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv"/>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/lv"></ListView>
</LinearLayout>