想写好久了，第一篇博客，先上效果图
image.png
话不多说，不瞎逼逼，上代码
先看看xml.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:background="@color/white"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/a"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:scrollbars="none">
</android.support.v7.widget.RecyclerView>
<FrameLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3">
<android.support.v7.widget.RecyclerView
android:id="@+id/a_b"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none">
</android.support.v7.widget.RecyclerView>
<LinearLayout
android:id="@+id/ll_group"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:orientation="vertical">
<TextView
android:id="@+id/tv_group_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:textColor="@color/white"
/>
</LinearLayout>
</FrameLayout>
</LinearLayout>
这里的textview就是悬浮的效果
看activity代码：
package com.example.kun.recyclerview;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.example.kun.recyclerview.Adapter.AAdapter;
import com.example.kun.recyclerview.Adapter.A_B_Adapter;
import com.example.kun.recyclerview.View.UnKnowNameActivity;
import com.example.kun.recyclerview.constant.ItemEntity;
import java.util.ArrayList;
import java.util.List;
import butterknife.BindView;
import butterknife.ButterKnife;
/**
* Created by Kun on 2017/9/7.
*/
public class RenXingActivity extends Activity {
@BindView(R.id.a)
RecyclerView a;
@BindView(R.id.a_b)
RecyclerView aB;
@BindView(R.id.tv_group_name)
TextView tvGroupName;
@BindView(R.id.ll_group)
LinearLayout llGroup;
private List<ItemEntity> list = new ArrayList<>();
private AAdapter a_Adapter;
private A_B_Adapter a_B_Adapter;
private LinearLayoutManager aLinerLayoutManager;
private LinearLayoutManager a_bLinerLayoutManager;
private int mCurrentPosition = 0;
private int mSuspensionHeight;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ren_xing);
ButterKnife.bind(this);
initData();
initEvent();
}
private void initData() {
initAdapter();
createData();
setData();
}
/**
* 初始化适配器，并初始化rc的linerLayoutManager
*/
private void initAdapter() {
aLinerLayoutManager = new LinearLayoutManager(this);
aLinerLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
a_Adapter = new AAdapter(this);
a.setLayoutManager(aLinerLayoutManager);
a.setAdapter(a_Adapter);
a_bLinerLayoutManager = new LinearLayoutManager(this);
a_bLinerLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
a_B_Adapter = new A_B_Adapter(this);
aB.setLayoutManager(a_bLinerLayoutManager);
aB.setAdapter(a_B_Adapter);
}
/**
* 创建数据，用一个list封装，用type来区别是爸爸还是儿子
*/
private void createData() {
ItemEntity item = new ItemEntity();
item.setId("0");
item.setName("0");
item.setType(1);
list.add(item);
for (int i = 0; i < 10; i++) {
ItemEntity item1 = new ItemEntity();
item1.setId(i + 1 + "");
item1.setName(i + 1 + "");
item1.setType(2);
list.add(item1);
}
ItemEntity item2 = new ItemEntity();
item2.setId("11");
item2.setName("11");
item2.setType(1);
list.add(item2);
for (int i = 12; i < 15; i++) {
ItemEntity item1 = new ItemEntity();
item1.setId(i + "");
item1.setName(i + "");
item1.setType(2);
list.add(item1);
}
ItemEntity item3 = new ItemEntity();
item3.setId("15");
item3.setName("15");
item3.setType(1);
list.add(item3);
ItemEntity item4 = new ItemEntity();
item4.setId("16");
item4.setName("16");
item4.setType(2);
list.add(item4);
ItemEntity item5 = new ItemEntity();
item5.setId("17");
item5.setName("17");
item5.setType(1);
list.add(item5);
for (int i = 18; i < 25; i++) {
ItemEntity item1 = new ItemEntity();
item1.setId(i + "");
item1.setName(i + "");
item1.setType(2);
list.add(item1);
}
ItemEntity item6 = new ItemEntity();
item6.setId("25");
item6.setName("25");
item6.setType(1);
list.add(item6);
for (int i = 26; i < 35; i++) {
ItemEntity item1 = new ItemEntity();
item1.setId(i + "");
item1.setName(i + "");
item1.setType(2);
list.add(item1);
}
}
/**
* 绑定数据
*/
private void setData() {
a_Adapter.setData(list, "0");
a_Adapter.notifyDataSetChanged();
a_B_Adapter.setData(list, "0");
a_B_Adapter.notifyDataSetChanged();
tvGroupName.setText(list.get(0).getName());
}
private void initEvent() {
a_Adapter.setOnItemSelectListener(new AAdapter.OnItemSelectListener() {
@Override
public void onItemSelect(String mId) {
//找到点击的item在数据源的什么位置
int position = 0;
for (int i = 0; i < list.size(); i++) {
ItemEntity itemEntity = list.get(i);
if (mId.equals(itemEntity.getId())) {
position = i;
break;
}
}
//让右侧的rc滑动到指定位置
a_bLinerLayoutManager.scrollToPositionWithOffset(position, 0);
}
});
a_B_Adapter.setOnItemSelectListener(new A_B_Adapter.OnItemSelectListener() {
@Override
public void onItemSelect(String mId) {
// Intent intent=new Intent(RenXingActivity.this, UnKnowNameActivity.class);
// startActivity(intent);
}
});
//右侧的滑动监听
aB.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
//得到text悬浮框的高度
mSuspensionHeight = llGroup.getHeight();
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
//得到当前滑动的view
View view = a_bLinerLayoutManager.findViewByPosition(mCurrentPosition+1);
//view与悬浮textview的比较
if (view != null) {
if (view.getTop() <= mSuspensionHeight) {
llGroup.setY(-(mSuspensionHeight - view.getTop()));
} else {
llGroup.setY(0);
}
}
//赋值将 第一个可见的item的position赋值给mCurrentPosition
if (mCurrentPosition != a_bLinerLayoutManager.findFirstVisibleItemPosition()) {
mCurrentPosition = a_bLinerLayoutManager.findFirstVisibleItemPosition();
llGroup.setY(0);
tvGroupName.setText(list.get(mCurrentPosition).getName());
}
}
});
}
}
两个adapter的代码
package com.example.kun.recyclerview.Adapter;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.example.kun.recyclerview.R;
import com.example.kun.recyclerview.RecyclerViewAdapter;
import com.example.kun.recyclerview.constant.ItemEntity;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Kun on 2017/9/7.
*/
public class AAdapter extends RecyclerView.Adapter<AAdapter.viewHolder> {
private Context mContext;
private List<ItemEntity> mList=new ArrayList<>();
private String mId;
public AAdapter(Context context){
this.mContext=context;
}
@Override
public viewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.item_a,parent, false);
viewHolder viewHolder = new viewHolder(view);
viewHolder.ll=(LinearLayout)view.findViewById(R.id.ll_a);
viewHolder.aName=(TextView)view.findViewById(R.id.a_name);
return viewHolder;
}
@Override
public void onBindViewHolder(viewHolder holder, final int position) {
ItemEntity itemEntity = mList.get(position);
holder.aName.setText(itemEntity.getName());
if(mId.equals(itemEntity.getId())){
holder.ll.setBackgroundColor(mContext.getResources().getColor(R.color.colorPrimary));
holder.aName.setTextColor(mContext.getResources().getColor(R.color.white));
}else{
holder.ll.setBackgroundColor(mContext.getResources().getColor(R.color.white));
holder.aName.setTextColor(mContext.getResources().getColor(R.color.colorPrimary));
}
holder.ll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(mOnItemSelectListener!=null){
mOnItemSelectListener.onItemSelect(mList.get(position).getId());
}
}
});
}
@Override
public int getItemCount() {
return mList==null ? 0: mList.size();
}
public void setData(List<ItemEntity> list, String id) {
if(list==null&&list.isEmpty()){
return;
}
mList.clear();
for (ItemEntity itemEntity : list) {
if(itemEntity.getType()==1){
mList.add(itemEntity);
}
}
this.mId=id;
}
class viewHolder extends RecyclerView.ViewHolder{
LinearLayout ll;
TextView aName;
public viewHolder(View itemView) {
super(itemView);
}
}
public interface OnItemSelectListener {
void onItemSelect(String mId);
}
private OnItemSelectListener mOnItemSelectListener;
public void setOnItemSelectListener(OnItemSelectListener mOnItemSelectListener) {
this.mOnItemSelectListener = mOnItemSelectListener;
}
}
package com.example.kun.recyclerview.Adapter;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.example.kun.recyclerview.R;
import com.example.kun.recyclerview.constant.ItemEntity;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Kun on 2017/9/7.
*/
public class A_B_Adapter extends RecyclerView.Adapter<A_B_Adapter.viewHolder> {
private Context mContext;
private List<ItemEntity> mList=new ArrayList<>();
private String mId;
public A_B_Adapter(Context context){
this.mContext=context;
}
@Override
public viewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.item_a_b,parent, false);
A_B_Adapter.viewHolder viewHolder = new A_B_Adapter.viewHolder(view);
viewHolder.llGroup = (LinearLayout) view.findViewById(R.id.ll_group);
viewHolder.llChild = (LinearLayout) view.findViewById(R.id.ll_child);
viewHolder.tvChildName = (TextView) view.findViewById(R.id.tv_child_name);
viewHolder.tvGroupName = (TextView) view.findViewById(R.id.tv_group_name);
return viewHolder;
}
@Override
public void onBindViewHolder(viewHolder holder, final int position) {
ItemEntity itemEntity = mList.get(position);
if(itemEntity.getType()==1){
holder.llGroup.setVisibility(View.VISIBLE);
holder.llChild.setVisibility(View.GONE);
holder.tvGroupName.setText(itemEntity.getName());
}else{
holder.llGroup.setVisibility(View.GONE);
holder.llChild.setVisibility(View.VISIBLE);
holder.tvChildName.setText(itemEntity.getName());
}
holder.tvGroupName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(mOnItemSelectListener!=null){
mOnItemSelectListener.onItemSelect(mList.get(position).getId());
}
}
});
holder.tvChildName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(mOnItemSelectListener!=null){
mOnItemSelectListener.onItemSelect(mList.get(position).getId());
}
}
});
}
@Override
public int getItemCount() {
return mList==null?0:mList.size();
}
public void setData(List<ItemEntity> list,String id) {
if(list==null&&list.isEmpty()){
return;
}
this.mList=list;
this.mId=id;
}
class viewHolder extends RecyclerView.ViewHolder{
private LinearLayout llGroup;
private LinearLayout llChild;
private TextView tvGroupName;
private TextView tvChildName;
public viewHolder(View itemView) {
super(itemView);
}
}
public interface OnItemSelectListener {
void onItemSelect(String mId);
}
private OnItemSelectListener mOnItemSelectListener;
public void setOnItemSelectListener(OnItemSelectListener mOnItemSelectListener) {
this.mOnItemSelectListener = mOnItemSelectListener;
}
}
好了,就这样了，最后建议大家自己去实现吧，持续更新，完成和美团一样的效果
