Material Design学习之RecyclerView(更强大的滚动控件)(4)
2017-11-12 09:28
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RecyclerView
RecyclerView是更为强大的滚动控件,不仅能实现纵向滚动的效果,也可以实现横向;1、首先添加相应的依赖库:
compile 'com.android.support:recyclerview-v7:25.0.1'
2、再布局中添加:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" 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="wrap_content"> </android.support.v7.widget.RecyclerView> </LinearLayout>
3、准备适配器:
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> { private List<Fruit> mFruitList; static class ViewHolder extends RecyclerView.ViewHolder{ ImageView fruitImage; TextView fruitName; public ViewHolder(View view) { super(view); fruitImage =(ImageView) view.findViewById(R.id.fruit_image); 4000 fruitName=(TextView)view.findViewById(R.id.fruit_name); } } public RecyclerAdapter(List<Fruit> fruitList){ mFruitList=fruitList; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item,parent,false); ViewHolder holder= new ViewHolder(view); return holder; } @Override public void onBindViewHolder(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(); } }
首先定义一个内部类ViewHolder,继承RecyclerView.ViewHolder;然后再构造函数中传入View参数,这个参数通常是RecyclerView子项的最外层布局,通过findViewbyId获取布局中的实例ImageView和TextView;
4、修改Activity:
public class RecyclerActivity extends AppCompatActivity { private List<Fruit> fruitList= new ArrayList<>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { ··· initFruit(); RecyclerView recyclerView= (RecyclerView)findViewById(R.id.recycler_view); LinearLayoutManager linearLayoutManager= new LinearLayoutManager(this); recyclerView.setLayoutManager(linearLayoutManager); RecyclerAdapter recyclerAdapter= new RecyclerAdapter(fruitList); recyclerView.setAdapter(recyclerAdapter); } private void initFruit(){ Fruit Kivi= new Fruit("Kivi",R.drawable.f1); fruitList.add(Kivi); Fruit berry = new Fruit("Berry",R.drawable.f3); fruitList.add(berry); Fruit Pinpple= new Fruit("Pinpple",R.drawable.f4); fruitList.add(Pinpple); Fruit app= new Fruit("Apple",R.drawable.f2); fruitList.add(app); } }
5、设置点击事件:
RecyclerView并没有提供setOnItemClickListener()这样的注册监听器方法,而是需要我们自己给子项提供具体的View去注册点击事件,相对于ListView要麻烦一些;这是因为setOnItemClickListener()是子项的点击事件,不能完成具体的按钮,虽然ListView能做到,但是很麻烦,所以RecyclerView摒弃了子项的点击事件。
package com.example.a17864.myrecyclerview; 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 17864 on 2017/11/11. */ public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> { private List<Fruit> mFruitList; static class ViewHolder extends RecyclerView.ViewHolder{ ··· 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 RecyclerAdapter(List<Fruit> fruitList){ mFruitList=fruitList; } @Override public 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); holder.fruitView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { int position = holder.getAdapterPosition(); Fruit fruit= mFruitList.get(position); Toast.makeText(view.getContext(),"you click 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 click image"+fruit.getName(),Toast.LENGTH_SHORT).show(); } }); return holder; } ··· }
在ViewHolder中添加了fruitView变量来保存子项最外层布局的实例,然后再onCreatViewHolder()方法中注册点击事件,先获取用户点击的position,然后拿到Fruit实例。
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