- gradle依赖
compile 'com.android.support:recyclerview-v7:26.1.0'
- 主页面布局
acticity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
- 页面中每一项的布局
fruit_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="100dp"
android:layout_height="wrap_content"(此处注意)
android:orientation="vertical">
<ImageView
android:id="@+id/fruitImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"/>
<TextView
android:id="@+id/fruitName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:textSize="18sp"
android:layout_marginTop="40dp"/>
</LinearLayout>
- 为RecyclerView准备一个适配器，新建FruitAdapter类，让这个适配器继承自RecyclerView.Adapter,并将泛型指定为FruitAdapter.ViewHolder,其中ViewHolder是FruitAdapter中的一个内部类。
package com.example.bbw.recyclerview;
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.TextView;
import android.widget.Toast;
import java.util.List;
/**
* Created by bbw on 2017/11/6.
* @author bbw
*/
public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder>{
private List<Fruit> mFruitList;
static class ViewHolder extends RecyclerView.ViewHolder{
ImageView fruitImage;
TextView fruitName;
View fruitView;
public ViewHolder(View itemView) {
super(itemView);
fruitView = itemView;
fruitImage = itemView.findViewById(R.id.fruitImage);
fruitName = itemView.findViewById(R.id.fruitName);
}
}
public FruitAdapter(List<Fruit> fruitList){
mFruitList = fruitList;
}
@Override
public FruitAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item,parent,false);
final ViewHolder holder = new ViewHolder(view);
//点击时候
holder.fruitView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(),fruit.getName(),Toast.LENGTH_SHORT).show();
}
});
holder.fruitImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(),fruit.getName(),Toast.LENGTH_SHORT).show();
}
});
return holder;
}
@Override
public void onBindViewHolder(FruitAdapter.ViewHolder holder, int position) {
Fruit fruit = mFruitList.get(position);
holder.fruitImage.setImageResource(fruit.getImageId());
holder.fruitName.setText(fruit.getName());
}
@Override
public int getItemCount() {
return mFruitList.size();
}
}
这里首先定义一个内部类ViewHolder,继承自RecycylerView.ViewHolder。然后ViewHolder的构造函数中要传入一个view参数，这个参数就是RecyclerView子项的最外层布局，现在就可以通过findViewById()来获取布局中的ImageView和TextView。之后就是重写三个方法。
- MainActivity.java
package com.example.bbw.recyclerview;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.widget.LinearLayout;
import java.util.ArrayList;
import java.util.List;
/**
* recyclerView知识点
* @author bbw
*/
public class MainActivity extends AppCompatActivity {
private List<Fruit> fruitList = new ArrayList<>();
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化水果数据
initFruits();
RecyclerView mRecyclerView = findViewById(R.id.recycler_view);
//线性布局
// LinearLayoutManager mLinearLayoutManager = new LinearLayoutManager(this);
// mLinearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
// mRecyclerView.setLayoutManager(mLinearLayoutManager);
//瀑布流布局
StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(layoutManager);
FruitAdapter adapter = new FruitAdapter(fruitList);
mRecyclerView.setAdapter(adapter);
}
private void initFruits() {
for (int i=0; i<2; i++){
Fruit apple = new Fruit("Apple",R.drawable.apple_pic);
fruitList.add(apple);
Fruit banana = new Fruit("Banana",R.drawable.banana_pic);
fruitList.add(banana);
Fruit orange = new Fruit("Orange",R.drawable.orange_pic);
fruitList.add(orange);
Fruit watermelon = new Fruit("Watermelon",R.drawable.watermelon_pic);
fruitList.add(watermelon);
Fruit pear = new Fruit("Pear",R.drawable.pear_pic);
fruitList.add(pear);
Fruit grape = new Fruit("Grape",R.drawable.grape_pic);
fruitList.add(grape);
Fruit pineapple = new Fruit("Pineapple",R.drawable.pineapple_pic);
fruitList.add(pineapple);
Fruit strawberry = new Fruit("Strawberry",R.drawable.strawberry_pic);
fruitList.add(strawberry);
Fruit cherry = new Fruit("Cherry",R.drawable.cherry_pic);
fruitList.add(cherry);
Fruit mango = new Fruit("Mango",R.drawable.mango_pic);
fruitList.add(mango);
}
}
}
