Android-RecyclerView

发表于 更新于 分类于 Waline：

RecyclerView 基本使用

  1. 添加依赖v7包依赖，版本号和compileSdkVersion一致，不然报错

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    implementation 'com.android.support:appcompat-v7:25.0.0'
    implementation 'com.android.support:recyclerview-v7:25.0.0'

  2. 在layout里添加RecyclerView布局的引用

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    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
    />

  3. 添加一个item的布局

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    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/recyNumberPhone"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/recyNumberName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </android.support.constraint.ConstraintLayout>

  4. 创建适配器RecyNumberAdapter继承 RecyclerView.Adapter

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    public class RecyNumberAdapter extends RecyclerView.Adapter<RecyNumberAdapter.NumberHolder>{
        private Context context; //上下文
        private List<Map<String,String>> mDatas;  //数据源
      
        public RecyNumberAdapter(Context context,List<Map<String,String>> mDatas){
            //构造方法传入数据
            this.context=context;
            this.mDatas=mDatas;
        }

        @Override
        public NumberHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            // 填充布局item
            View view = LayoutInflater.from(context).inflate(R.layout.recy_number, null);
            NumberHolder holder = new NumberHolder(view);
            return holder;
        }

        @Override
        public void onBindViewHolder(final NumberHolder holder, final int position) {
            //绑定view
      holder.recyNumberName.setText(String.valueOf(mDatas.get(position).get("name"))); //用户名
      holder.recyNumberPhone.setText(String.valueOf(mDatas.get(position).get("id"))); //电话号码  
        }

        @Override
        public int getItemCount() {
            return mDatas.size(); //数据长度
        }
        //类部类
        class  NumberHolder extends RecyclerView.ViewHolder{
            //获取item子布局的控件
            private TextView recyNumberPhone;
            private TextView recyNumberName;
            public NumberHolder(View view){
                super(view);
                recyNumberPhone=view.findViewById(R.id.recyNumberPhone);
                recyNumberName=view.findViewById(R.id.recyNumberName);
            }
        }
    }

  5. 调用测试

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    RecyclerView recyNumberView=findViewById(R.id.personalNumber);
    // 设置布局管理器有横向，表格等等
    GridLayoutManager gridLayoutManager=new GridLayoutManager(this,4);
    recyNumberView.setLayoutManager(gridLayoutManager);
    //测试数据
    List<Map<String,String>> datas=new ArrayList<>();
    Map<String,String> map=new HashMap<>();
    map.put("id","13432861290");
    map.put("name","张三");
    datas.add(map);
    //设置适配器
    recyNumberView.setAdapter(new RecyNumberAdapter(this,datas));

  6. 添加点击事件，在RecyNumberAdapter里添加

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    private OnItemClickListener mItemClickListener;
    //item的回调接口
    public interface OnItemClickListener {
    	void onItemClick(View view, int Position);
    }
    //定义一个设置点击监听器的方法
    public void setOnItemClickListener(OnItemClickListener itemClickListener) {
    	this.mItemClickListener = itemClickListener;
    }
    //在覆写的onBindViewHolder方法中添加
      //如果设置了回调，则设置点击事件
    if (mItemClickListener != null) {
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mItemClickListener.onItemClick(holder.itemView, position);
            }
        });
    }

  7. 调用的时候只需要recyNumberAdapter.setOnItemClickListener即可