Android Studio瀑布流实现

效果：

ImageDetail class

package com.example.waterfallflow;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;public class ImageDetail extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.imagedetail);Intent intent = getIntent();int image = intent.getIntExtra("image", R.mipmap.ic_launcher);ImageView imag = (ImageView) findViewById(R.id.details_img);imag.setImageResource(image);}
}

MainActivity类

package com.example.waterfallflow;import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;
import android.os.Bundle;
import android.content.Intent;
import android.view.View;
import com.example.waterfallflow.RecyclerViewAdapter;public class MainActivity extends AppCompatActivity implements RecyclerViewAdapter.onRecyclerViewItemClickListener {//定义一个图片数组private int[] image = {R.drawable.img, R.drawable.img_1, R.drawable.img_2, R.drawable.img_3, R.drawable.img_4, R.drawable.img_5,R.drawable.img_6, R.drawable.img_7, R.drawable.img_8, R.drawable.img_9, R.drawable.img_10,R.drawable.img_11, R.drawable.img_12, R.drawable.img_13, R.drawable.img_14, R.drawable.img_15,R.drawable.img_16, R.drawable.img_17, R.drawable.img_18, R.drawable.img_19};private RecyclerView recyclerview;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {recyclerview = (RecyclerView) findViewById(R.id.recyclerview);//新建一个RecyclerView的适配器，并传入数据RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(this, image);//将适配器设置给recyclerview控件recyclerview.setAdapter(recyclerViewAdapter);//新建一个StaggeredGridLayoutManager布局管理器，设置参数：1.显示的列数   2.显示布局的方向（水平或垂直）StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);//将布局管理器设置给recyclerveiw控件recyclerview.setLayoutManager(staggeredGridLayoutManager);//给适配器添加我们暴露的监听方法recyclerViewAdapter.setOnRecyclerViewItemClickListener(this);}//实现我们的监听接口里的方法，在这里获得数据，对数据进行操作@Overridepublic void onItemClick(View view, int img) {//创建一个intent，指明跳转目标类Intent intent = new Intent(this, ImageDetail.class);//拿到数据传给intentintent.putExtra("image", img);//启动ActivitystartActivity(intent);}
}

RecyclerViewAdapter适配器

package com.example.waterfallflow;import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import androidx.recyclerview.widget.RecyclerView;
import com.example.waterfallflow.R;//让我们的适配器继承自RecyclerView.Adapter<>，并指定泛型为我们适配器的类名.ViewHolder，
// ViewHolder继承自RecyclerView.ViewHolder，并实现每个继承要实现的方法
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> implements View.OnClickListener {private Context context;private int[] image;//声明一个这个接口的变量private onRecyclerViewItemClickListener mOnRecyclerViewItemClickListener=null;//构造函数，主要用于接受数据，方便我们在适配器中对数据操作public RecyclerViewAdapter(Context context, int[] image) {this.context = context;this.image = image;}//创建ViewHolder，我们需要在这个方法中给新建一个view对象，再初始化一个ViewHolder对象，将view对象传入//然后返回一个ViewHolder对象@Overridepublic RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {//创建一个view对象（通过布局填充器将布局文件转化为view对象）View view = View.inflate(context, R.layout.waterfall_item, null);//初始化一个ViewHolder对象，传入view对象ViewHolder viewHolder = new ViewHolder(view);view.setOnClickListener(this);//将ViewHolder对象返回出去return viewHolder;}//绑定ViewHolder，我们需要在这个方法中给控件设置数据@Overridepublic void onBindViewHolder(RecyclerViewAdapter.ViewHolder holder, int position) {//给ImageView控件设置数据holder.mImageView.setImageResource(image[position]);//给每个itemview添加一个Tag,传递数据holder.itemView.setTag(image[position]);}//获取item的条目总数@Overridepublic int getItemCount() {//直接返回图片数组的长度即可return image.length;}//将点击事件转移给外面的调用者@Overridepublic void onClick(View v) {if (mOnRecyclerViewItemClickListener != null) {//通过v.getTag()接受数据mOnRecyclerViewItemClickListener.onItemClick(v, (Integer) v.getTag());}}//我们自定义的ViewHolder类，继承自RecyclerView.ViewHolderpublic class ViewHolder extends RecyclerView.ViewHolder {private final ImageView mImageView;public ViewHolder(View itemView) {super(itemView);//通过传过来的view对象，我们来实例化控件mImageView = (ImageView) itemView.findViewById(R.id.show_img);}}//自定义一个监听的接口，里面包含itemclick的监听方法，主要用于拿数据，方便外部调用拿数据public interface onRecyclerViewItemClickListener{void onItemClick(View view,int img);}//定义一个设置Listener的方法（），作用是暴露给外面的调用者，方便调用public void setOnRecyclerViewItemClickListener(onRecyclerViewItemClickListener onRecyclerViewItemClickListener) {mOnRecyclerViewItemClickListener = onRecyclerViewItemClickListener;}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/recyclerview"android:layout_width="match_parent"android:layout_height="match_parent" /></RelativeLayout>

imagedetail.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="wrap_content"android:layout_height="wrap_content"><ImageViewandroid:id="@+id/details_img"android:adjustViewBounds="true"android:scaleType="centerCrop"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout>

waterfall_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:padding="3dp"android:layout_width="match_parent"android:layout_height="match_parent"><!--android:adjustViewBounds="true":设置View控件的宽高比等于图片的宽高比（图片不失真）对图片进行等比例放缩。android:scaleType="centerCrop"：设置控件的中心与图片的中心一致，对图片进行等比例放缩，直到填充满view控件。一般这两个属性搭配使用--><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"/><ImageViewandroid:id="@+id/show_img"android:adjustViewBounds="true"android:scaleType="centerCrop"android:layout_width="wrap_content"android:layout_height="wrap_content"/>
</LinearLayout>