android精美卡片式布局Cardview_RecyclerView

一、activity_main.xml要这么写，其中主要是包含一个RecyclerView.

<androidx.drawerlayout.widget.DrawerLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:id="@+id/drawer_layout"android:layout_width="match_parent"android:layout_height="match_parent">
<androidx.coordinatorlayout.widget.CoordinatorLayoutandroid:layout_width="match_parent"android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content">


<androidx.appcompat.widget.Toolbarandroid:id="@+id/toolbar"android:layout_width="match_parent"android:layout_height="?attr/actionBarSize"android:background="?attr/colorPrimary"android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"app:popupTheme="@style/ThemeOverlay.AppCompat.Light"app:layout_scrollFlags="scroll|enterAlways|snap"/>com.google.android.material.appbar.AppBarLayout><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/recycler_view"android:layout_width="match_parent"android:layout_height="match_parent"app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"/>androidx.coordinatorlayout.widget.CoordinatorLayout>
androidx.drawerlayout.widget.DrawerLayout>

二、RecyclerView子项所需要的一个实体类Fruit,要这么写

package com.example.magicalpai.beautiful_cardview;public class Fruit {private String name;private int imageId;public Fruit(String name, int imageId) {this.name = name;this.imageId = imageId;}public String getName() {return name;}public int getImageId() {return imageId;}
}

三、RecyclerView子项对应的布局fruit_item.xml，要这么写

<androidx.cardview.widget.CardViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="5dp"app:cardCornerRadius="4dp"><LinearLayoutandroid:orientation="vertical"android:layout_width="match_parent"android:layout_height="wrap_content"><ImageViewandroid:id="@+id/fruit_image"android:layout_width="match_parent"android:layout_height="100dp"/>

<TextViewandroid:id="@+id/fruit_name"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_margin="5dp"android:textSize="16sp" />LinearLayout>
androidx.cardview.widget.CardView>

四、RecyclerView 的适配器FruitAdapter类，要这么写

package com.example.magicalpai.beautiful_cardview;import android.content.Context;
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 androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.RecyclerView;import com.bumptech.glide.Glide;
import com.example.magicalpai.R;import java.util.List;public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {private Context mContext;private List<Fruit> mFruitList;static class ViewHolder extends RecyclerView.ViewHolder {CardView cardView;ImageView fruitImage;TextView fruitName;public ViewHolder(View view) {super(view);cardView = (CardView) view;fruitImage = (ImageView) view.findViewById(R.id.fruit_image);fruitName = (TextView) view.findViewById(R.id.fruit_name);}}public FruitAdapter(List<Fruit> fruitList) {mFruitList = fruitList;}@Overridepublic ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {if (mContext == null) {mContext = parent.getContext();}View view = LayoutInflater.from(mContext).inflate(R.layout.fruit_item,parent, false);final ViewHolder holder = new ViewHolder(view);//为每一个子项的cardView注册事件holder.cardView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {int position = holder.getAdapterPosition();Fruit fruit = mFruitList.get(position);Toast.makeText(v.getContext(), "you clicked image " + fruit.getName(), Toast.LENGTH_SHORT).show();}});return holder;}@Overridepublic void onBindViewHolder(ViewHolder holder, int position) {Fruit fruit = mFruitList.get(position);holder.fruitName.setText(fruit.getName());/*Glide的用法：调用Glide.with()方法并传入一个Context、Activity或Fragment参数，然后调用load()方法去加载图片，可以是一个URL地址，也可以是一个本地路径，或者是一个资源id，最后调用into()方法将图片设置到具体某一个ImageView中就可以了Glide会对高清图片进行压缩，这样就不会发生内存溢出的问题了使用Glide，在app/build.grade文件中添加implementation 'com.github.bumptech.glide:glide:3.8.0即可*/Glide.with(mContext).load(fruit.getImageId()).into(holder.fruitImage);}@Overridepublic int getItemCount() {return mFruitList.size();}
}

五、主方法MainActivity，要这么写

package com.example.magicalpai.beautiful_cardview;import androidx.appcompat.app.AppCompatActivity;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;import android.os.Bundle;import com.example.magicalpai.R;import java.util.ArrayList;
import java.util.List;
import java.util.Random;public class MainActivity extends AppCompatActivity {private DrawerLayout mDrawerLayout;private Fruit[] fruits = {new Fruit("Apple", R.drawable.apple), new Fruit("Banana",R.drawable.banana), new Fruit("Watermelon",R.drawable.watermelon)};private List<Fruit> fruitList = new ArrayList<>();private FruitAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initFruits();RecyclerView recyclerView=(RecyclerView)findViewById(R.id.recycler_view);//GridLayoutManager的构造方法接收两个参数，第一个是Context,第二个是列数，这里我们希望每一行中会有两列数据GridLayoutManager layoutManager = new GridLayoutManager(this, 2);recyclerView.setLayoutManager(layoutManager);adapter = new FruitAdapter(fruitList);recyclerView.setAdapter(adapter);}private void initFruits() {fruitList.clear();for (int i = 0; i < 50; i++) {Random random = new Random();int index = random.nextInt(fruits.length);fruitList.add(fruits[index]);}}
}

六、这样就可以实现以下效果

滚动界面toolbar会自动隐藏，点击第一个水果还会有相应的提示。

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