RecyclerView + CardView
github:
https://github.com/Gong-Shijie/RecyclerView-CardView
RecyclerView比ListView更加容易使用,而且实现的效果也更加丰富
支持实现的效果:线性排列:分为横排列和竖排列;还支持瀑布流排列。
RecyclerView搭配CardView可以十分美观的满足你的各种需求。
添加RecyclerView依赖
implementation 'androidx.recyclerview:recyclerview:1.0.0'
添加CardView依赖
implementation 'androidx.cardview:cardview:1.0.0'
RecyclerView
竖直排列横向排列
瀑布流效果
网格效果
以上三种布局方式都是基于layoutmanager来实现的。
实现步骤
- 在mainActivity中初始化用来显示的数据集合List
private void iniflist() {
Data data = new Data();
int length = data.imageList.size();
for (int i = 0; i < length; i++) {
flist.add(new Fruit(data.imageList.get(i), data.nameList.get(i)));
}
}
- 书写RecyclerView对应的XML文件
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_height="match_parent"
android:layout_width="match_parent" />
- 定义每一item的布局结合CardView可以将布局放在卡片内
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/fruit_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left" />
<TextView
android:id="@+id/fruit_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/fruit_image"
android:layout_marginTop="10dp" />
</RelativeLayout>
- 定义全局的RecyclerView并且findviewbyid
- 在mainActivity中为recyclerView定义layoutManager和adapter
iniflist();
recyclerView = findViewById(R.id.recycler_view);
// 通过LayoutManager来呈现出列表或者横向滑动列表或者是瀑布流的效果
// 横向或者竖向的列表布局
LinearLayoutManager layoutManager = new LinearLayoutManager(this,0,false);
// 瀑布流布局
StaggeredGridLayoutManager layoutManager1=new StaggeredGridLayoutManager(3,1);
// 网格布局
GridLayoutManager layoutManager2 = new GridLayoutManager(this,2);
recyclerView.setLayoutManager(layoutManager);
FruitAdapter adapter = new FruitAdapter(flist);
recyclerView.setAdapter(adapter);
- 完成Adapter类的创建,并且在内部定义static类ViewHolder
继承抽象类RecyclerView.Adapter<FruitAdapter.ViewHolder>
实现方法:
ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)创建viewHolder完成监听注册
onBindViewHolder(@NonNull ViewHolder holder, int position)将数据取出填充到布局
getItemCount()返回数据项数
内部类static class ViewHolder extends RecyclerView.ViewHolder
class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {
private List<Fruit> flist;
public FruitAdapter(List<Fruit> flist) {
this.flist = flist;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
//完成创建ViewHolder和将布局用布局加载器加载到viewHolder中
//为viewHolder里面的子view注册监听事件
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item,parent,false);
final ViewHolder viewHolder = new ViewHolder(view);
viewHolder.fView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//viewHolder.getAdapterPosition()将会返回被点击的item的index
int position = viewHolder.getAdapterPosition();
Fruit fruit = flist.get(position);
Toast.makeText(v.getContext(),"Click:"+fruit.getF_name(),Toast.LENGTH_SHORT).show();
}
});
viewHolder.imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = viewHolder.getAdapterPosition();
Fruit fruit = flist.get(position);
Toast.makeText(v.getContext(),"Click: Image",Toast.LENGTH_SHORT).show();
}
});
return viewHolder;
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
//根据position将每一个flist里面的值绑定到viewholder
Fruit fruit = flist.get(position);
holder.imageView.setImageResource(fruit.getF_image());
holder.textView.setText(fruit.getF_name());
}
@Override
public int getItemCount() {
//返回flist的长度
return flist.size();
}
static class ViewHolder extends RecyclerView.ViewHolder{
//这些控件都可以设置监听事件
View fView;
ImageView imageView;
TextView textView;
public ViewHolder(@NonNull View itemView) {
super(itemView);
fView = itemView.findViewById(R.id.f_view);
imageView = itemView.findViewById(R.id.fruit_image);
textView = itemView.findViewById(R.id.fruit_name);
}
}
}
CardView
设置卡片为圆角效果
设置阴影有立体感
设置点击呈现涟漪效果
<!-- 卡片布局效果将每一个item作为一个卡片-->
<androidx.cardview.widget.CardView android:layout_height="wrap_content"
android:id="@+id/f_view"
android:layout_width="wrap_content"
app:cardElevation="100dp"
app:cardCornerRadius="4dp"
android:clickable="true"
android:foreground="?android:attr/selectableItemBackground"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/fruit_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left" />
<TextView
android:id="@+id/fruit_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/fruit_image"
android:layout_marginTop="10dp" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
关键代码
Data.java(预加载初始化打包数据)
public class Data {
public List<Integer> imageList = new ArrayList<>();
public List<String> nameList = new ArrayList<>();
public Data() {
imageList.add(R.drawable.apple_pic);
imageList.add(R.drawable.banana_pic);
imageList.add(R.drawable.cherry_pic);
imageList.add(R.drawable.grape_pic);
imageList.add(R.drawable.mango_pic);
imageList.add(R.drawable.orange_pic);
imageList.add(R.drawable.pear_pic);
imageList.add(R.drawable.pineapple_pic);
imageList.add(R.drawable.strawberry_pic);
imageList.add(R.drawable.watermelon_pic);
nameList.add("Apple");
nameList.add("Banana");
nameList.add("Cherry");
nameList.add("Grape");
nameList.add("Mango");
nameList.add("Orange");
nameList.add("Pear");
nameList.add("Pineapple");
nameList.add("Strawberry");
nameList.add("Watermelon");
imageList.add(R.drawable.apple_pic);
imageList.add(R.drawable.banana_pic);
imageList.add(R.drawable.cherry_pic);
imageList.add(R.drawable.grape_pic);
imageList.add(R.drawable.mango_pic);
imageList.add(R.drawable.orange_pic);
imageList.add(R.drawable.pear_pic);
imageList.add(R.drawable.pineapple_pic);
imageList.add(R.drawable.strawberry_pic);
imageList.add(R.drawable.watermelon_pic);
nameList.add("Apple");
nameList.add("Banana");
nameList.add("Cherry");
nameList.add("Grape");
nameList.add("Mango");
nameList.add("Orange");
nameList.add("Pear");
nameList.add("Pineapple");
nameList.add("Strawberry");
nameList.add("Watermelon");
}
}
FruitAdapter.java
class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {
private List<Fruit> flist;
public FruitAdapter(List<Fruit> flist) {
this.flist = flist;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
//完成创建ViewHolder和将布局用布局加载器加载到viewHolder中
//为viewHolder里面的子view注册监听事件
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item,parent,false);
final ViewHolder viewHolder = new ViewHolder(view);
viewHolder.fView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//viewHolder.getAdapterPosition()将会返回被点击的item的index
int position = viewHolder.getAdapterPosition();
Fruit fruit = flist.get(position);
Toast.makeText(v.getContext(),"Click:"+fruit.getF_name(),Toast.LENGTH_SHORT).show();
}
});
viewHolder.imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = viewHolder.getAdapterPosition();
Fruit fruit = flist.get(position);
Toast.makeText(v.getContext(),"Click: Image",Toast.LENGTH_SHORT).show();
}
});
return viewHolder;
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
//根据position将每一个flist里面的值绑定到viewholder
Fruit fruit = flist.get(position);
holder.imageView.setImageResource(fruit.getF_image());
holder.textView.setText(fruit.getF_name());
}
@Override
public int getItemCount() {
//返回flist的长度
return flist.size();
}
static class ViewHolder extends RecyclerView.ViewHolder{
//这些控件都可以设置监听事件
View fView;
ImageView imageView;
TextView textView;
public ViewHolder(@NonNull View itemView) {
super(itemView);
fView = itemView.findViewById(R.id.f_view);
imageView = itemView.findViewById(R.id.fruit_image);
textView = itemView.findViewById(R.id.fruit_name);
}
}
}
Main
public class MainActivity extends AppCompatActivity {
//凡是需要使用的进行操作的数据(对象类型)不要忘记初始化否则会造成空引用
private List<Fruit> flist = new ArrayList<>();
private RecyclerView recyclerView;
@SuppressLint("WrongConstant")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iniflist();
recyclerView = findViewById(R.id.recycler_view);
// 通过LayoutManager来呈现出列表或者横向滑动列表或者是瀑布流的效果
// 横向或者竖向的列表布局
LinearLayoutManager layoutManager = new LinearLayoutManager(this,0,false);
// 瀑布流布局
StaggeredGridLayoutManager layoutManager1=new StaggeredGridLayoutManager(3,1);
// 网格布局
GridLayoutManager layoutManager2 = new GridLayoutManager(this,2);
recyclerView.setLayoutManager(layoutManager);
FruitAdapter adapter = new FruitAdapter(flist);
recyclerView.setAdapter(adapter);
}
private void iniflist() {
Data data = new Data();
int length = data.imageList.size();
for (int i = 0; i < length; i++) {
flist.add(new Fruit(data.imageList.get(i), data.nameList.get(i)));
}
}
}
参考文献:《第一行代码》
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