RecyclerView实现瀑布流，长按删除条目效果

最近在逛CSDN的时候发现一篇RecyclerView实现瀑布流效果的文章，看完之后便自己动手做了一下，比较简单，实现的效果也挺好的，在这里分享给大家以供参考！
1.添加RecyclerView的依赖：implementation 'com.android.support:recyclerview-v7:26.1.0'2.设置初始化数据，这里模拟一下列表数据： protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_waterfall);
initData();
initView();

}

private void initData() {
list = new ArrayList<>();
for (int i = 0; i < 200; i++){
list.add("第" + i + "条数据");
}
}3.初始化视图，给RecyclerView设置布局参数和Adapter:private void initView() {
mRecyclerview = findViewById(R.id.recyclerview);//找控件
adapter = new RecycleAdapter(list);//适配器
mRecyclerview.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL));//布局管理器

mRecyclerview.setAdapter(adapter);//设置适配器
mRecyclerview.setItemAnimator(new DefaultItemAnimator());//设置条目默认动画
onClick();
}在这里可以给删除条目的设置一个动画，有兴趣的童鞋可以自己去加想要的动画，我这里简单起见设置了默认的动画，在设置布局管理器的时候，里面的参数分别代表着几列和方向：mRecyclerview.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL));//布局管理器
4.onClick()是RecyclerView条目的的点击事件，这里我采用的是接口回调：private void onClick() {
adapter.setOnItemClickListener(new RecycleAdapter.onItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(WaterFallDemo.this,"点击了第"+position+"条数据",Toast.LENGTH_SHORT).show();
}

@Override
public void onLongItemClick(View view, int position) {
adapter.removeItem(position);
}
});
}5.接下来就是适配器部分的内容了
首先新建并初始化一个用以装载item随机高度的集合，在后面动态改变高度： private List<String> mlist;
private List<Integer> mheight;
// private Context context;

public RecycleAdapter(List<String> list){
this.mlist = list;
// this.context = context;
mheight = new ArrayList<Integer>();
for (int i = 0 ;i<list.size();i++){
mheight.add((int)(150+Math.random()*300));
}
Log.e("hhhhhh",mlist.size()+"");
}然后动态设置每个条目的高度： ViewGroup.LayoutParams params = ((ViewHolder)holder).textView.getLayoutParams();
params.height = mheight.get(position);
((ViewHolder)holder).textView.setLayoutParams(params);
((ViewHolder)holder).textView.setText(mlist.get(position));接着是接口回调条目点击事件： //接口回调条目的点击事件
if (mlistener != null){
((ViewHolder)holder).itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = holder.getAdapterPosition();
mlistener.onItemClick(holder.itemView,pos);
}
});
((ViewHolder)holder).itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int pos = holder.getAdapterPosition();
mlistener.onLongItemClick(holder.itemView,pos);
return false;
}
});
}最后是接口回调的设置： //设置接口回调
private onItemClickListener mlistener;
public interface onItemClickListener {
void onItemClick(View view,int position);
void onLongItemClick(View view,int position);
}
public void setOnItemClickListener(onItemClickListener listener){
this.mlistener = listener;
}

//长按条目删除
public void removeItem(int position){
mlist.remove(position);
notifyItemRemoved(position);
}6.ok，到此就可以实现瀑布流加长按删除的的效果了。下面附上我的完整代码和2个布局文件activity_waterfall和waterfall_item：
a
ac69
ctivity_waterfall：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent">

</android.support.v7.widget.RecyclerView>

</LinearLayout>waterfall_item：<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<TextView
android:id="@+id/textview"
android:layout_width="100dp"
android:layout_height="100dp"
android:gravity="center"
android:background="#28c8b7"
android:layout_marginTop="5dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginBottom="5dp"
android:text="1"
/>

</LinearLayout>WaterFallDemo.java:package com.example.os.nestedscrollingdemo.view;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.widget.Toast;

import com.example.os.nestedscrollingdemo.R;
import com.example.os.nestedscrollingdemo.RecycleAdapter;

import java.util.ArrayList;
import java.util.List;

/**
* Created by OS on 2018/3/20.
*/

public class WaterFallDemo extends AppCompatActivity {

private List<String> list;

private RecyclerView mRecyclerview;
private RecycleAdapter adapter;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_waterfall);
initData();
initView();

}

private void initData() {
list = new ArrayList<>();
for (int i = 0; i < 200; i++){
list.add("第" + i + "条数据");
}
}

private void initView() {
mRecyclerview = findViewById(R.id.recyclerview);//找控件
adapter = new RecycleAdapter(list);//适配器
mRecyclerview.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL));//布局管理器

mRecyclerview.setAdapter(adapter);//设置适配器
mRecyclerview.setItemAnimator(new DefaultItemAnimator());//设置条目默认动画
onClick();
}

private void onClick() {
adapter.setOnItemClickListener(new RecycleAdapter.onItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(WaterFallDemo.this,"点击了第"+position+"条数据",Toast.LENGTH_SHORT).show();
}

@Override
public void onLongItemClick(View view, int position) {
adapter.removeItem(position);
}
});
}
}
RecycleAdapter.java:package com.example.os.nestedscrollingdemo;

import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
* Created by OS on 2018/3/12.
*/

public class RecycleAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

private List<String> mlist;
private List<Integer> mheight;
// private Context context;

public RecycleAdapter(List<String> list){
this.mlist = list;
// this.context = context;
mheight = new ArrayList<Integer>();
for (int i = 0 ;i<list.size();i++){
mheight.add((int)(150+Math.random()*300));
}
Log.e("hhhhhh",mlist.size()+"");
}

@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.waterfall_item,parent,false);
ViewHolder holder = new ViewHolder(view);
return holder;
}

@Override
public void onBindViewHolder(@NonNull final RecyclerView.ViewHolder holder, final int position) {
ViewGroup.LayoutParams params = ((ViewHolder)holder).textView.getLayoutParams();
params.height = mheight.get(position);
((ViewHolder)holder).textView.setLayoutParams(params);
((ViewHolder)holder).textView.setText(mlist.get(position));
//接口回调条目的点击事件
if (mlistener != null){
((ViewHolder)holder).itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = holder.getAdapterPosition();
mlistener.onItemClick(holder.itemView,pos);
}
});
((ViewHolder)holder).itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int pos = holder.getAdapterPosition();
mlistener.onLongItemClick(holder.itemView,pos);
return false;
}
});
}

}

@Override
public int getItemCount() {
return mlist.size();
}

public class ViewHolder extends RecyclerView.ViewHolder{

private TextView textView;

public ViewHolder(View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.textview);
}
}

//设置接口回调
private onItemClickListener mlistener;
public interface onItemClickListener {
void onItemClick(View view,int position);
void onLongItemClick(View view,int position);
}
public void setOnItemClickListener(onItemClickListener listener){
this.mlistener = listener;
}

//长按条目删除
public void removeItem(int position){
mlist.remove(position);
notifyItemRemoved(position);
}

}
欢迎各位提出宝贵建议，一起交流学习！
转载自：http://blog.csdn.net/nazicsdn/article/details/79607148