RecyclerView 的使用

这是RecyclerView所需要的权限:implementation 'com.android.support:recyclerview-v7:26.1.0'这是RecyclerView的布局和添加和删除:<?xml version="1.0" encoding="utf-8"?><LinearLayout xml

害的人

157人浏览 · 2018-05-23 20:53:38

害的人 · 2018-05-23 20:53:38 发布

这是RecyclerView所需要的权限:

implementation 'com.android.support:recyclerview-v7:26.1.0'

这是RecyclerView的布局和添加和删除:

<?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="com.example.administrator.recyclerview.MainActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:layout_height="wrap_content">
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/listview"
            android:text="ListView"
            />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/gridview"
            android:text="Gridview"
            />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/delete"
            android:text="删除"
            />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/add"
            android:text="添加"
            />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/pubu"
            android:text="瀑布式"
            />
    </LinearLayout>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.v7.widget.RecyclerView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/recycler"
            android:layout_gravity="center"
            ></android.support.v7.widget.RecyclerView>
    </RelativeLayout>

</LinearLayout>

这是RecyclerView的核心代码:

@Override
public void onClick(View view) {
    switch (view.getId()){
        case R.id.listview:
            recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
            break;
        case R.id.gridview:
            recyclerView.setLayoutManager(new GridLayoutManager(this,2));

            break;
        case R.id.pubu:
            recyclerView.setLayoutManager(new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL));

            break;
        case R.id.add:
            datas.add("itme"+datas.size());
            recycleViewAdapter.notifyDataSetChanged();
            recyclerView.setItemAnimator(new DefaultItemAnimator());
            break;
        case R.id.delete:
            datas.remove(datas.size()-1);
            recycleViewAdapter.notifyDataSetChanged();
            break;
    }
}

这是RecyclerView里面的下划线代码:

recyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));

这是点击事件:

listview.setOnClickListener(this);//这是listview类型的展示数据
gridview.setOnClickListener(this);//这是GridView类型展示数据
add.setOnClickListener(this);//这是添加
delete.setOnClickListener(this);//这是删除
pubu.setOnClickListener(this);//这是瀑布式展示数据

加载数据:

private void myData() {
    datas = new ArrayList<>();
    for (int i = 0; i <20; i++) {
        datas.add("itme"+i);
    }
}

这是RecyclerView的适配器(在Activty里面的代码):

private RecycleViewAdapter recycleViewAdapter;

recycleViewAdapter = new RecycleViewAdapter(this,datas);
recyclerView.setAdapter(recycleViewAdapter);

这是适配器里面的代码:

public class RecycleViewAdapter extends RecyclerView.Adapter<RecycleViewAdapter.ViewHolder> {
    private List<String> data;
    private Context context;

    public RecycleViewAdapter(Context context, List<String> datas) {
        this.data = datas;
        this.context = context;
    }
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View inflate = View.inflate(context, R.layout.shou_mian, null);
        ViewHolder viewHolder = new ViewHolder(inflate);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        String s = data.get(position);
        holder.name.setText(s);
    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        private final TextView name;
        private final ImageView imag;

        public ViewHolder(View itemView) {
             super(itemView);
            name = itemView.findViewById(R.id.name);
            imag = itemView.findViewById(R.id.imageview);

        }
     }
     }

这是点击事件子条目的图片的代码:

public class RecycleViewAdapter extends RecyclerView.Adapter<RecycleViewAdapter.ViewHolder> {
    private List<String> data;
    private Context context;

    public RecycleViewAdapter(Context context, List<String> datas) {
        this.data = datas;
        this.context = context;
    }
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View inflate = View.inflate(context, R.layout.shou_mian, null);
        ViewHolder viewHolder = new ViewHolder(inflate);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        String s = data.get(position);
        holder.name.setText(s);
        holder.imag.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(monClickItmeLisener!=null){
                    monClickItmeLisener.onclickItme(holder.imag,data.get(position));
                }
            }
        });
    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        private final TextView name;
        private final ImageView imag;

        public ViewHolder(View itemView) {
             super(itemView);
            name = itemView.findViewById(R.id.name);
            imag = itemView.findViewById(R.id.imageview);

        }
     }
     public interface  OnClickItmeLisener{
      void onclickItme(View view,String Data);
     }
     private OnClickItmeLisener monClickItmeLisener;
    public  void setOnClickItmeLisener(OnClickItmeLisener onClickItmeLisener){
        monClickItmeLisener=onClickItmeLisener;
    }
}

这是Activty里面的点击事件:

recycleViewAdapter.setOnClickItmeLisener(new RecycleViewAdapter.OnClickItmeLisener() {
    @Override
    public void onclickItme(View view, String Data) {
        Toast.makeText(MainActivity.this,Data,Toast.LENGTH_SHORT).show();
    }
});

下面是整个Activty里面的代码:

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button listview,pubu,delete,add,gridview;
    private RecyclerView recyclerView;
    private List<String> datas;
   private RecycleViewAdapter recycleViewAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        myData();
        listview.setOnClickListener(this);
        gridview.setOnClickListener(this);
        add.setOnClickListener(this);
        delete.setOnClickListener(this);
        pubu.setOnClickListener(this);
        recycleViewAdapter = new RecycleViewAdapter(this,datas);
        recyclerView.setAdapter(recycleViewAdapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
        recycleViewAdapter.setOnClickItmeLisener(new RecycleViewAdapter.OnClickItmeLisener() {
            @Override
            public void onclickItme(View view, String Data) {
                Toast.makeText(MainActivity.this,Data,Toast.LENGTH_SHORT).show();
            }
        });
    }
    private void myData() {
        datas = new ArrayList<>();
        for (int i = 0; i <20; i++) {
            datas.add("itme"+i);
        }
    }
    private void initView() {
        listview = findViewById(R.id.listview);
        gridview = findViewById(R.id.gridview);
        add = findViewById(R.id.add);
        delete = findViewById(R.id.delete);
        pubu = findViewById(R.id.pubu);
        recyclerView = findViewById(R.id.recycler);
    }
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.listview:
                recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
                break;
            case R.id.gridview:
                recyclerView.setLayoutManager(new GridLayoutManager(this,2));

                break;
            case R.id.pubu:
                recyclerView.setLayoutManager(new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL));

                break;
            case R.id.add:
                datas.add("itme"+datas.size());
                recycleViewAdapter.notifyDataSetChanged();
                recyclerView.setItemAnimator(new DefaultItemAnimator());
                break;
            case R.id.delete:
                datas.remove(datas.size()-1);
                recycleViewAdapter.notifyDataSetChanged();
                break;
        }
    }


}