6步轻松实现两个listView联动效果

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' 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:tools="http://schemas.android.com/tools"   android:id="@+id/activity_main"   android:orientation="horizontal"   android:layout_width="match_parent"   android:layout_height="match_parent"   tools:context="com.example.twolist.MainActivity">    <ListView     android:id="@+id/left"     android:layout_width="88dp"     android:background="#eaebec"     android:layout_height="match_parent" />   <ListView     android:id="@+id/right"     android:layout_width="match_parent"     android:layout_height="match_parent" />   </LinearLayout> 

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<ParaseData> apiServiceMovieList = apiService.getMovieList();     apiServiceMovieList.subscribeOn(Schedulers.io())         .observeOn(AndroidSchedulers.mainThread())         .subscribe(new Subscriber<ParaseData>() {           @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;         }        }     });    }    } 

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<String> 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);     }   }    } 

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<ParaseData.DataBean> data;   LayoutInflater inflater;   Context context;     public RightAdapter(Context context, List<ParaseData.DataBean> data) {     this.context=context;     inflater = LayoutInflater.from(context);     if (data != null) {       this.data=data;     }else {       this.data=new ArrayList<>();     }   }   public void addRes(List<ParaseData.DataBean> 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);     }   } } 

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<ParaseData> getMovieList(); } 

package com.example.twolist;  import java.util.List;  /**  * Created by ALong on 2017/4/5.  */  public class ParaseData {     private List<DataBean> data;      public List<DataBean> getData() {     return data;   }    public void setData(List<DataBean> 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;     }   } }