2018-07-24

仿淘宝宝贝详情页面三个Tablayout小demo：

activity_main布局：

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity">

<android.support.design.widget.TabLayout

android:id="@+id/tb" android:layout_width="match_parent"

android:layout_height="wrap_content">

<android.support.design.widget.TabItem

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="baby" />

<android.support.design.widget.TabItem

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="discuss"/>

<android.support.design.widget.TabItem

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="detail" />

</android.support.design.widget.TabLayout>

<ListView

android:layout_width="match_parent"

android:layout_height="match_parent"

android:id="@+id/lv"/>

</LinearLayout>

MainActivity代码：

package com.example.lijunlu.taobao;

import android.os.Bundle;

import android.support.design.widget.TabLayout;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.AbsListView;

import android.widget.ListView;

import android.widget.Toast;

import java.lang.reflect.Field;

import java.util.ArrayList;

public class MainActivityextends AppCompatActivityimplements AbsListView.OnScrollListener {

private TabLayouttb;

private ListViewlv;

private ArrayListlist;

private int position;

private CustomAdapteradapter1;

@Override

    protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

list =new ArrayList<>();

for (int i =0; i <200; i++) {

list.add("龙雀" + i);

}

initView();

}

private void initView() {

tb = (TabLayout) findViewById(R.id.tb);

lv = (ListView) findViewById(R.id.lv);

adapter1 =new CustomAdapter(list,this);

lv.setAdapter(adapter1);

lv.setOnScrollListener(this);

for (int i =0; i

TabLayout.Tab tab =tb.getTabAt(i);

if (tab ==null)

return;

Class c = tab.getClass();

try {

Field field = c.getDeclaredField("mView");

field.setAccessible(true);

final View view = (View) field.get(tab);

if (view ==null)

return;

view.setTag(i);

view.setOnClickListener(new View.OnClickListener() {

@Override

                    public void onClick(View v) {

position = (int)view.getTag();

switch (position) {

case 0:

lv.setSelection(0);

break;

case 1:

lv.setSelection(50);

break;

case 2:

lv.setSelection(70);

break;

}

}

});

}catch (Exception e) {

e.printStackTrace();

}

}

}

int post;

@Override

    public void onScrollStateChanged(AbsListView view,int scrollState) {

switch (scrollState) {

case 0:

switch (post) {

case 0:

TabLayout.Tab tab =tb.getTabAt(0);

tab.select();

break;

case 50:

TabLayout.Tab tab2 =tb.getTabAt(1);

tab2.select();

break;

case 70:

TabLayout.Tab tab3 =tb.getTabAt(2);

tab3.select();

break;

}

Toast.makeText(this,"我现在处于不滑动状态", Toast.LENGTH_SHORT).show();

break;

case 1:

Toast.makeText(this,"我现在处于滑动状态", Toast.LENGTH_SHORT).show();

break;

}

}

@Override

    public void onScroll(AbsListView view,int firstVisibleItem,int visibleItemCount,int totalItemCount) {

switch (firstVisibleItem) {

case 0:

post =0;

break;

case 50:

post =50;

break;

case 70:

post =70;

break;

case 49:

post =0;

break;

case 69:

post =50;

break;

}

}

}

适配器：

package com.example.lijunlu.taobao;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;

import java.util.ArrayList;

public class CustomAdapterextends BaseAdapter {

private ArrayListlist =new ArrayList<>();

private Contextcontext;

public CustomAdapter(ArrayList list, Context context) {

this.list = list;

this.context = context;

}

@Override

    public int getCount() {

return list.size();

}

@Override

    public Object getItem(int position) {

return list.get(position);

}

@Override

    public long getItemId(int position) {

return position;

}

@Override

    public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder viewHolder =null;

if (convertView ==null) {

convertView = LayoutInflater.from(context).inflate(R.layout.item,null);

viewHolder =new ViewHolder(convertView);

convertView.setTag(viewHolder);

}else {

viewHolder = (ViewHolder)convertView.getTag();

}

viewHolder.tv.setText(list.get(position));

return convertView;

}

public static class ViewHolder {

public ViewrootView;

public TextViewtv;

public ViewHolder(View rootView) {

this.rootView = rootView;

this.tv = (TextView) rootView.findViewById(R.id.tv);

}

}

}