使用RecyclerView
1、在app/build.gradle(Module:app)文件的dependencies闭包添加依赖
compile 'com.android.support:recyclerview-v7:25.1.0'
2、编写适配器类xxxAdapter,继承自RecyclerView.Adapter,并制定泛型为 xxxAdapter.ViewHolder,这个ViewHolder是在该Adapter中定义的一个内部类。示例代码如下:
package com.songzheng.recyclerviewtest;
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 make on 2017/2/5.
*/
//RecyclerView 适配器,继承自RecyclerView.Adapter
public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {
private List<Fruit> mFruitList;
//创建ViewHolder,继承自RecyclerView.ViewHolder
static class ViewHolder extends RecyclerView.ViewHolder{
ImageView fruitImage;
TextView fruitName;
View fruitView; //设置View最外层点击事件所需
public ViewHolder(View itemView) {
super(itemView);
fruitImage = (ImageView) itemView.findViewById(R.id.fruit_image);
fruitName = (TextView) itemView.findViewById(R.id.fruit_name);
fruitView = itemView;
}
}
public FruitAdapter(List<Fruit> fruitList){
mFruitList = fruitList;
}
//加载item,实例化ViewHolder,设置点击监听事件
@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);
//设置点击事件
holder.fruitView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int position = holder.getAdapterPosition();//获取点击控件的位置
Fruit fruit = mFruitList.get(position);
Toast.makeText(view.getContext(), "you clicked view " + fruit.getName(), Toast.LENGTH_SHORT).show();
}
});
holder.fruitImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(view.getContext(), "You clicked image " + fruit.getName(), Toast.LENGTH_SHORT).show();
}
});
return holder;
}
//设置控件内容
@Override
public void onBindViewHolder(FruitAdapter.ViewHolder holder, int position) {
Fruit fruit = mFruitList.get(position);
holder.fruitName.setText(fruit.getName());
holder.fruitImage.setImageResource(fruit.getImageId());
}
@Override
public int getItemCount() {
return mFruitList.size();
}
}
3、在MainActivity中为RecyclerView指定布局形式(使用LayoutManager)和适配器。
其中指定布局形式可以使用LinearLayoutManager(实现ListView类似的效果,但RecyclerView不仅可以纵向排列,还可以横向排列)或者GridLayoutManager(网格布局)或者StaggeredGridLayoutManager(瀑布流布局)。
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);
// LinearLayoutManager layoutManager = new LinearLayoutManager(this); //线性布局
// layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL); //设置布局方向为横向
StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL); //瀑布流
recyclerView.setLayoutManager(layoutManager);
FruitAdapter adapter = new FruitAdapter(fruitList);
recyclerView.setAdapter(adapter);
}
}