android RecyclerView的Linear布局案例

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".RecycleViewActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/re1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:layout_editor_absoluteX="202dp"
        tools:layout_editor_absoluteY="184dp" />
</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="wrap_content"
    tools:context=".RecyclerLinearItemActivity"
    android:background="@color/colorBg">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_height="60dp"
        android:text="@string/textview"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />
</androidx.constraintlayout.widget.ConstraintLayout>

package com.example.myapplication;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;


public class LinearAdapter extends RecyclerView.Adapter<LinearAdapter.LinearViewHolder> {

    private Context context;
    public LinearAdapter(Context context){
        this.context = context;
    }

    @NonNull
    @Override
    public LinearAdapter.LinearViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new LinearViewHolder(LayoutInflater.from(context).inflate(R.layout.activity_recycler_linear_item,parent,false));
    }

    @Override
    public void onBindViewHolder(@NonNull LinearAdapter.LinearViewHolder holder, final int position) {
        holder.tv.setText("Hello World");

        holder.tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context,"click..."+position,Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public int getItemCount() {
        return 30;
    }

    class LinearViewHolder extends RecyclerView.ViewHolder{

        private TextView tv;

        public LinearViewHolder(@NonNull View itemView) {
            super(itemView);

            tv = itemView.findViewById(R.id.textView2);
        }
    }
}

package com.example.myapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;


import android.graphics.Rect;
import android.os.Bundle;
import android.view.View;

public class RecycleViewActivity extends AppCompatActivity {

    private RecyclerView rv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycle_view);

        rv = findViewById(R.id.re1);

        rv.setLayoutManager(new LinearLayoutManager(RecycleViewActivity.this));
        //设置分割线
        rv.addItemDecoration( new MyDecoration());
        rv.setAdapter(new LinearAdapter(RecycleViewActivity.this));
    }

    class MyDecoration extends RecyclerView.ItemDecoration {

        @Override
        public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
            super.getItemOffsets(outRect, view, parent, state);

            outRect.set(0,0,0,getResources().getDimensionPixelOffset(R.dimen.height));

        }
    }
}