recyclerView的使用

Posted 2020-09-25 点滴之水

1.xml布局

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

</android.support.v7.widget.RecyclerView>

2。在Activity中使用

package com.hyang.administrator.studentproject.activity;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.ArrayAdapter;

import com.hyang.administrator.studentproject.MyAdapter;
import com.hyang.administrator.studentproject.R;

import org.xutils.x;

import java.util.ArrayList;

/**
 * listView的下拉刷新
 */
public class PullListViewActivity extends AppCompatActivity {

    private ArrayAdapter<String> arrayAdapter;

    private RecyclerView mRecyclerView;

    private RecyclerView.Adapter mAdapter;

    private RecyclerView.LayoutManager mLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pull_list_view);
        x.view().inject(this);

        initData();
        initView();
    }
private void initData() {
        mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        mAdapter = new MyAdapter(getData());
    }

    private void initView() {
        mRecyclerView = (RecyclerView) findViewById(R.id.recycler);
        // 设置布局管理器
        mRecyclerView.setLayoutManager(mLayoutManager);
        // 设置adapter
        mRecyclerView.setAdapter(mAdapter);
    }

    private ArrayList<String> getData() {
        ArrayList<String> data = new ArrayList<>();
        String temp = " item";
        for(int i = 0; i < 20; i++) {
            data.add(i + temp);
        }

        return data;
    }
}

3.适配器

package com.hyang.administrator.studentproject;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * Created by Administrator on 2017/6/27.
 *
 */
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private ArrayList<String> mData;

    public MyAdapter(ArrayList<String> data) {
        this.mData = data;
    }

    public void updateData(ArrayList<String> data) {
        this.mData = data;
        notifyDataSetChanged();
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // 实例化展示的view
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_view_item, parent, false);
        // 实例化viewholder
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        // 绑定数据
        holder.mTv.setText(mData.get(position));
    }

    @Override
    public int getItemCount() {
        return mData == null ? 0 : mData.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {

        TextView mTv;

        public ViewHolder(View itemView) {
            super(itemView);
            mTv = (TextView) itemView.findViewById(R.id.item_tv);
        }
    }
}