RecyclerView简单使用方法

RecyclerView简单使用方法

1. RecyclerView的添加依赖文件
2. RecyclerView的常规使用方法
3. RecyclerView的点击监听写法

添加依赖文件

• Project Structure中的Modules下的Dependencies
• 点击绿色的+号
• 找到v7下的recyclerView库
  

res/layout文件代码如下

 .support.v7.widget.RecyclerView
    android:id="@+id/recyclerview"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    .support.v7.widget.RecyclerView>

Activity中的代码类似与ListView

    //绑定View
    recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
    //新建适配器
    listAdapter = new DrawerListAdapter(list);
    //设置布局管理(可以实现ListView,GirdView,瀑布流等效果)
    RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);
    //绑定适配器
    recyclerView.setAdapter(listAdapter);

Activity中的代码

    package com.example.zx.samle_bar;
    import android.support.v4.widget.DrawerLayout;
    import android.support.v7.app.ActionBarDrawerToggle;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.support.v7.widget.Toolbar;
    import android.view.Menu;
    import android.view.MenuInflater;
    import android.view.MenuItem;
    import android.widget.ListView;
    import android.widget.Toast;
    import com.example.zx.samle_bar.Adapter.DrawerListAdapter;
    import com.example.zx.samle_bar.Bean.DrawerContext;
    import java.util.ArrayList;
    import java.util.List;
    public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private List list;
    private DrawerListAdapter listAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        list = new ArrayList<>();
        initData();
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(listAdapter);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_main,menu);

        return super.onCreateOptionsMenu(menu);
    }
    private void initData(){
        int[] imgs = {R.drawable.settings,
                R.drawable.helpcircle,
                R.drawable.sharevariant,
                R.drawable.wikipedia};
        String[] names={"设置","帮助","分享","维基百科"};
        for(int i = 0;i < 4;i ++){
            DrawerContext context = new DrawerContext(imgs[i],names[i]);
            list.add(context);
        }
    }
    }

Adapter文件的代码如下

    package com.example.zx.samle_bar.Adapter;
    import android.support.v7.widget.RecyclerView;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import android.widget.RelativeLayout;
    import android.widget.TextView;

    import com.example.zx.samle_bar.Bean.DrawerContext;
    import com.example.zx.samle_bar.Interface.MyItemClickListener;
    import com.example.zx.samle_bar.R;

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

    /**
     * Created by zx on 2017-03-12.
     */

    public class DrawerListAdapter extends RecyclerView.Adapter {
        private List drawerList;
        private MyItemClickListener listener;
        public DrawerListAdapter(List list){
            this.drawerList = list;
        }

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            final View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_drawer_list,parent,false);
            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            view.setLayoutParams(lp);
            return new MyViewHolder(view);
        }


        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
            DrawerContext context = drawerList.get(position);
            ((MyViewHolder)holder).img.setImageResource(context.getImg());
            ((MyViewHolder)holder).tv.setText(context.getName());
            ((MyViewHolder)holder).itemView.setTag(position);
        }

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

        public void setOnItemClickListener(MyItemClickListener listener){
            this.listener = listener;
        }

        class MyViewHolder extends RecyclerView.ViewHolder{
            public ImageView img;
            public TextView tv;

            public MyViewHolder(View view) {
                super(view);
                img = (ImageView) view.findViewById(R.id.icon);
                tv = (TextView) view.findViewById(R.id.name);
            }
        }
    }

DrawerContext的代码

    package com.example.zx.samle_bar.Bean;

    /**
     * Created by zx on 2017-03-12.
     */

    public class DrawerContext {
        private int img;
        private String name;

    public DrawerContext() {
    }

    public DrawerContext(int img, String name) {
        this.img = img;
        this.name = name;
    }

    public int getImg() {
        return img;
    }

    public void setImg(int img) {
        this.img = img;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

重点！重点！重点

由于RecyclerView并现ClickListener的监听!
因此需要自己写一个回调来实现对点击事件的监听
步骤如下：

创建一个Interface

 package com.example.zx.samle_bar.Interface;

    import android.view.View;

    /**
     * Created by zx on 2017-03-12.
     */

    public interface MyItemClickListener {
        void onItemClick(View view,int position);
    }

在Adapter文件中实例化,调用onClickListener 传递给 onItemClick

    private MyItemClickListener listener;
    view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
        if (listener == null){
            listener.onItemClick(view,(int)view.getTag());
        }
     }
    });

再到Activity中实现这个函数的回调

    drawerListAdapter.setOnItemClickListener(new MyItemClickListener() {
            @Override
            public void onItemClick(View view, int postion) {

                Intent intent = new Intent(getApplicationContext(), SlideMenuActivity.class);
                intent.putExtra("itemId", postion);
                startActivity(intent);
                overridePendingTransition(R.anim.activity_in, R.anim.activity_out);

            }
        });

如果对回调函数有什么不明白的地方参见csdn大神的博客
http://blog.csdn.net/xiaanming/article/details/8703708/