Android开发-RecyclerView-AndroidStudio(二)点击删除数据

通过点击事件删除一条数据，RecyclerView会自动加载动画效果，但是我快速连续点击APP会出现崩溃，暂时不考虑解决方案，因为实际项目中，不可能直接点击删除，点击后直接删除数据，至少会出现一个dialog询问用户"是/否"。

点击删除数据，主要在MyAdapter中实现。

看一下效果：



MyAdapter.java:

package com.iwanghang.recyclerviewdemo;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

/**
* ViewHolder 减少不必要的调用findViewById，不必要每次都重新加载控件布局
*/
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> implements View.OnClickListener {

private Context context;
private List<String> list;
// 接口回调
private OnMyItemClickListener listener;
private RecyclerView recyclerView;

// 接口回调 setter getter
// public OnMyItemClickListener getOnMyItemClickListener() {
// return listener;
// }
public void setOnMyItemClickListener(OnMyItemClickListener listener) {
this.listener = listener;
}

// 当它连接到一个RecyclerView调用的方法
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
this.recyclerView = recyclerView;
}
// 当它与RecyclerView解除连接调用的方法
@Override
public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
super.onDetachedFromRecyclerView(recyclerView);
this.recyclerView = null;
}

public MyAdapter(Context context, List<String> list) {
this.context = context;
this.list = list;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.item,parent,false);
view.setOnClickListener(this);
return new MyViewHolder(view);
}
// 上面 view.setOnClickListener(this);的点击实现方法
@Override
public void onClick(View view) {
if (recyclerView != null && listener != null) {
int position = recyclerView.getChildAdapterPosition(view);
listener.onMyItemClick(recyclerView,view,position,list.get(position)); // 接口回调
}
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.item_text.setText(list.get(position));
}
@Override
public int getItemCount() {
return list.size();
}

public static class MyViewHolder extends RecyclerView.ViewHolder{
private TextView item_text;
public MyViewHolder(View itemView) {
super(itemView);
item_text = (TextView) itemView.findViewById(R.id.item_text);
}
}

// public Context getContext() {
// return context;
// }
// public void setContext(Context context) {
// this.context = context;
// }
// public List<String> getList() {
// return list;
// }
// public void setList(List<String> list) {
// this.list = list;
// }

// 接口回调
public interface OnMyItemClickListener{
void onMyItemClick(RecyclerView parent, View view, int position, String data);
}

// 删除数据
public void remove(int position){
list.remove(position);
//notifyDataSetChanged();// 提醒list刷新，没有动画效果
notifyItemRemoved(position); // 提醒item删除指定数据，这里有RecyclerView的动画效果
}
}


MainActivity.java:
package com.iwanghang.recyclerviewdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Toast;

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

/**
* RecyclerView 可以简单的理解为ListView
*/
public class MainActivity extends AppCompatActivity implements MyAdapter.OnMyItemClickListener {

RecyclerView recycler;
MyAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

recycler = (RecyclerView) findViewById(R.id.recycler);
List<String> list = new ArrayList<>();
for (int i = 0; i <100 ; i++) {
list.add(String.format(Locale.CHINA,"第%03d条数据",i));
}
adapter = new MyAdapter(this,list);
recycler.setAdapter(adapter);
adapter.setOnMyItemClickListener(this);
}

@Override
public void onMyItemClick(RecyclerView parent, View view, int position, String data) {
Toast.makeText(this, data, Toast.LENGTH_SHORT).show();
adapter.remove(position); // 删除数据
}
}


activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.iwanghang.recyclerviewdemo.MainActivity">

<android.support.v7.widget.RecyclerView
android:id="@+id/recycler"
app:layoutManager="LinearLayoutManager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>


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

<TextView
android:id="@+id/item_text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

</LinearLayout>