简单实现两个listView的联动效果(网络框架Retrofit+Rxjava)
看了网上更新的好多联动demo,感觉写的不是很简洁(表示不知道他们在说什么)
自己写了一个简单的Demo分享给大家- -!
效果图:
直接上车,少说废话!
所用到以下的这几个依赖,直接粘到Build.gradle文件中
compile 'com.squareup.picasso:picasso:2.5.2'
compile 'io.reactivex:rxjava:1.2.7'
compile 'io.reactivex:rxandroid:1.2.1'
compile 'com.squareup.retrofit2:retrofit:2.2.0'
compile 'com.squareup.retrofit2:converter-gson:2.2.0'
compile 'com.squareup.retrofit2:adapter-rxjava:2.2.0'1.定义首页的布局文件
package com.example.twolist;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ListView;
import com.example.twolist.adapters.LeftAdapter;
import com.example.twolist.adapters.RightAdapter;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import rx.Observable;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
public class MainActivity extends AppCompatActivity{
/**
* 右侧电影列表的接口
* http://app.vmoiver.com/apiv3/post/getPostInCate?cateid=0&p=1
*/
private ListView mLeft;
private ListView mRight;
private RightAdapter rightAdapter;
private LeftAdapter adapter;
//记录滑动的ListView 滑动的位置
private int scrollPosition = -1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
getData();
}
private void getData() {
Retrofit retrofit = new Retrofit.Builder()
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.addConverterFactory(GsonConverterFactory.create())
.baseUrl("http://app.vmoiver.com").build();
ApiService apiService = retrofit.create(ApiService.class);
Observable apiServiceMovieList = apiService.getMovieList();
apiServiceMovieList.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(ParaseData paraseData) {
rightAdapter.addRes(paraseData.getData());
}
});
}
private void initView() {
mLeft = (ListView) findViewById(R.id.left);
mRight = (ListView) findViewById(R.id.right);
adapter = new LeftAdapter(this);
mLeft.setAdapter(adapter);
rightAdapter = new RightAdapter(this, null);
mRight.setAdapter(rightAdapter);
mLeft.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
adapter.setSelectItem(position);
mRight.setSelection(position);
}
});
mRight.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (scrollPosition != firstVisibleItem) {
adapter.setSelectItem(firstVisibleItem);
mLeft.setSelectionFromTop(firstVisibleItem, 40);
scrollPosition = firstVisibleItem;
}
}
});
}
}
3.左边ListView的适配器
package com.example.twolist.adapters;
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.example.twolist.R;
import java.util.ArrayList;
import java.util.List;
/**
* Created by ALong on 2017/4/5.
*/
public class LeftAdapter extends BaseAdapter {
List data;
LayoutInflater inflater;
private int selectItem=0;
public void setSelectItem(int selectItem) {
this.selectItem = selectItem;
notifyDataSetChanged();
}
public LeftAdapter(Context context) {
data=new ArrayList<>();
for (int i = 0; i < 10; i++) {
data.add("电影"+i);
}
inflater=LayoutInflater.from(context);
}
@Override
public int getCount() {
return data!=null?data.size():0;
}
@Override
public String getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView=inflater.inflate(R.layout.left_item,parent,false);
holder=new ViewHolder(convertView);
convertView.setTag(holder);
}else {
holder= (ViewHolder) convertView.getTag();
}
holder.mText.setText(data.get(position));
if (selectItem == position) {
holder.mText.setTextColor(Color.BLUE);
holder.mIndicator.setVisibility(View.VISIBLE);
}else {
holder.mText.setTextColor(Color.BLACK);
holder.mIndicator.setVisibility(View.INVISIBLE);
}
return convertView;
}
public static class ViewHolder{
TextView mText;
View mIndicator;
public ViewHolder(View itemView) {
mText= (TextView) itemView.findViewById(R.id.left_text);
mIndicator=itemView.findViewById(R.id.left_indicator);
}
}
}
4.右边ListView的适配器
package com.example.twolist.adapters;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.twolist.ParaseData;
import com.example.twolist.R;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.List;
/**
* Created by ALong on 2017/4/5.
*/
public class RightAdapter extends BaseAdapter {
List data;
LayoutInflater inflater;
Context context;
public RightAdapter(Context context, List data) {
this.context=context;
inflater = LayoutInflater.from(context);
if (data != null) {
this.data=data;
}else {
this.data=new ArrayList<>();
}
}
public void addRes(List data){
if (data != null) {
this.data.clear();
this.data.addAll(data);
notifyDataSetChanged();
}
}
@Override
public int getCount() {
return data.size();
}
@Override
public ParaseData.DataBean getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.right_item, parent, false);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
} else {
holder= (ViewHolder) convertView.getTag();
}
holder.mTitle.setText(getItem(position).getTitle());
holder.mMsg.setText(getItem(position).getTitle());
Picasso.with(context).load(getItem(position).getImage()).into(holder.mImg);
return convertView;
}
public static class ViewHolder {
ImageView mImg;
TextView mTitle;
TextView mMsg;
public ViewHolder(View itemView) {
mImg = (ImageView) itemView.findViewById(R.id.right_img);
mTitle = (TextView) itemView.findViewById(R.id.right_text);
mMsg = (TextView) itemView.findViewById(R.id.right_msg);
}
}
}
5.Retrofit解析的接口文件
package com.example.twolist;
import retrofit2.http.GET;
import rx.Observable;
/**
* Created by ALong on 2017/4/5.
*/
public interface ApiService {
//可以使用参数的拼接,实现分页的加载,简单的Demo就不搞那么复杂了
@GET("/apiv3/post/getPostInCate?cateid=0&p=1")
Observable getMovieList();
}
6.Gson解析需要使用的类
package com.example.twolist;
import java.util.List;
/**
* Created by ALong on 2017/4/5.
*/
public class ParaseData {
private List data;
public List getData() {
return data;
}
public void setData(List data) {
this.data = data;
}
public static class DataBean {
private String title;
private String image;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
}
}
然后就没有然后了,6个步骤写完了