RecyclerView
一、RecyclerView不是Android自带的，需要导入
implementation 'com.android.support:recyclerview-v7:28.+'
二、引入RecyclerView
<?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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.recyclerviewtest.MainActivity"><android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" /></LinearLayout>
三、创建RecyclerView的布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="100dp"
android:layout_height="wrap_content"><ImageView
android:id="@+id/fruit_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"/><TextView
android:id="@+id/fruit_name"
android:layout_below="@id/fruit_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
/>
</RelativeLayout>
四、创建Java实体类
public class Fruit {
private String name;
private int imageId;
public Fruit(){
}
public Fruit(String name, int imageId){
this.name = name;
this.imageId = imageId;
}public String getName(){
return name;
}public int getImageId(){
return imageId;
}
}
五、创建Adapter
public class FruitAdater extends RecyclerView.Adapter<FruitAdater.ViewHolder> {
private List<Fruit> mFruitList;
static class ViewHolder extends RecyclerView.ViewHolder {
ImageView fruitImage;
TextView fruitName;
View fruitView;public ViewHolder(View view){
super(view);
fruitView = view;
fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
fruitName = (TextView) view.findViewById(R.id.fruit_name);
}
}public FruitAdater(List<Fruit> fruitList){
mFruitList = fruitList;
}/**
* onCreateViewHolder()创建ViewHoder实例
*/
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Log.d("FruitAdater", "parent:" + parent + " viewType: " + viewType);
//实例化对象
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.fruit_item,parent,false);
//将加载的view布局传到构造函数中
final ViewHolder holder = new ViewHolder(view);
//设置点击事件
holder.fruitView.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
//获取当前布局在Adapter的最新地址
int position = holder.getLayoutPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(),fruit.getName(),Toast.LENGTH_SHORT).show();
}
});//fruitImage(图片)点击事件
holder.fruitImage.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
//返回数据在Adapter的地址（也许位置的变化还未来得及刷新到布局中）
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(),"OnClickListener",Toast.LENGTH_SHORT).show();
}
});
return holder;
}/**
* onBindViewHolder()方法将Recycler的子项的数据赋值
*/
@Override
public void onBindViewHolder(FruitAdater.ViewHolder holder, int position) {
Fruit fruit = mFruitList.get(position);
holder.fruitImage.setImageResource(fruit.getImageId());
holder.fruitName.setText(fruit.getName());
}/**
* getItemCount()获取RecyclerView的子项，返回数据源的长度
*/
@Override
public int getItemCount() {
return mFruitList.size();
}
}
六、引用
public class MainActivity extends AppCompatActivity {
private List<Fruit> fruitList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);initFruits();
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
//组件垂直往下执行，LinearLayoutManager设置布局方式
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
//更改为横向排列
layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
recyclerView.setLayoutManager(layoutManager);//将集合传入
FruitAdater adater = new FruitAdater(fruitList);
recyclerView.setAdapter(adater);}
private void initFruits(){
for(int i = 0; i < 3; i++){
Fruit apple = new Fruit("Apple",R.drawable.apple);
fruitList.add(apple);
Fruit banana = new Fruit("Banana",R.drawable.banana);
fruitList.add(banana);
Fruit orange = new Fruit("Orange",R.drawable.orange);
fruitList.add(orange);
Fruit watermelon = new Fruit("Watermelon",R.drawable.watermelon);
fruitList.add(watermelon);
Fruit pear = new Fruit("Pear",R.drawable.pear);
fruitList.add(pear);
Fruit grape = new Fruit("Grape",R.drawable.grapes);
fruitList.add(grape);
Fruit mango = new Fruit("Mango",R.drawable.mango);
fruitList.add(mango);
}
}
}
七、效果，目前为横向排列，可左右滑动
RecyclerView瀑布流布局
//更改StaggeredGridLayoutManager
//瀑布流布局，三列垂直布局
StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
效果