大伙肯定遇到过RecycleView的复用问题,一般都是在model层设置一个标志,然后根据这个标志控制.
前几天做项目,遇到这个问题的时候,想着,有没有其他方式解决这个问题,搞了大概十几分钟吧,发现一个不错的方式,记录一下,各位大佬有好的方式,请在下方留言,小弟不胜感激!!
先上个效果图
效果图
XML布局
item布局
activity代码
package com.sy.gwb.ui.activity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.ImageView;
import com.sy.gwb.R;
import com.sy.gwb.adapter.BaseAdapter;
import com.sy.gwb.adapter.BaseViewHolder;
import com.sy.gwb.adapter.OnItemClickListener;
import java.util.ArrayList;
import java.util.List;
import butterknife.BindView;
import butterknife.ButterKnife;
public class DiscountCouponActivity extends AppCompatActivity implements BaseAdapter.BaseAdapterListener, OnItemClickListener {
@BindView(R.id.rv_show)
RecyclerView mRvShow;
private List mList = new ArrayList<>();
private int prePosition; // 之前的位置
private int currentPosition; // 当前的位置
private BaseAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_discount_coupon);
ButterKnife.bind(this);
for (int i = 0; i < 10; i++) {
mList.add("");
}
// 这个没什么好说的
mAdapter = new BaseAdapter(mList, this, R.layout.item_discount_coupons, this);
mRvShow.setLayoutManager(new LinearLayoutManager(this));
mRvShow.setAdapter(mAdapter);
mAdapter.setOnItemClickListener(this);
}
@Override
public void convert(final BaseViewHolder holder, String str) {
int layoutPosition = holder.getLayoutPosition();
holder.setVisible(R.id.view, layoutPosition == mList.size() - 1);
ImageView iv_select = holder.getView(R.id.iv_select);
holder.setVisible(R.id.iv_select);
if (layoutPosition == currentPosition) {
iv_select.setImageResource(R.mipmap.green_selected);
} else {
iv_select.setImageResource(R.mipmap.normal_selected);
}
}
@Override
public void onItemClick(int position) {
// TODO: 2018/4/18 如果是相同的不设置
if (prePosition != position) {
currentPosition = position;
mAdapter.notifyItemChanged(position);
mAdapter.notifyItemChanged(prePosition);
prePosition = position;
}
}
}
自己封装的BaseAdapter
package com.sy.gwb.adapter;
import android.content.Context;
import android.support.annotation.LayoutRes;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.List;
/**
* Created by ${GongWenbo} on 2018/3/30 0030.
*/
public class BaseAdapter extends RecyclerView.Adapter implements View.OnClickListener {
private List mDatas;
private Context mContext;
private int layoutId;
private BaseAdapterListener mBaseAdapterListener;
private OnItemClickListener mOnItemClickListener;
public BaseAdapter(List datas, Context context, @LayoutRes int layoutId, BaseAdapterListener baseAdapterListener) {
this.mDatas = datas;
this.mContext = context;
this.layoutId = layoutId;
this.mBaseAdapterListener = baseAdapterListener;
}
@Override
public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(layoutId, parent, false);
view.setOnClickListener(this);
return new BaseViewHolder(view);
}
@Override
public void onBindViewHolder(BaseViewHolder holder, int position) {
if (mBaseAdapterListener != null) {
mBaseAdapterListener.convert(holder, mDatas.get(position));
holder.itemView.setTag(position);
}
}
@Override
public int getItemCount() {
return mDatas == null ? 0 : mDatas.size();
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
mOnItemClickListener = onItemClickListener;
}
@Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
mOnItemClickListener.onItemClick((Integer) v.getTag());
}
}
public interface BaseAdapterListener {
void convert(BaseViewHolder holder, T t);
}
}
自己封装的BaseViewHolder
package com.sy.gwb.adapter;
import android.graphics.Color;
import android.support.annotation.IdRes;
import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.View;
import android.widget.TextView;
/**
* Created by ${GongWenbo} on 2018/3/30 0030.
*/
public class BaseViewHolder extends RecyclerView.ViewHolder {
protected View itemView;
private SparseArray views;
public BaseViewHolder(View itemView) {
super(itemView);
this.views = new SparseArray<>();
this.itemView = itemView;
}
public T getView(@IdRes int viewId) {
View view = views.get(viewId);
if (view == null) {
view = itemView.findViewById(viewId);
views.put(viewId, view);
}
return (T) view;
}
public View setTitle(@IdRes int viewId, String title) {
View view = getView(viewId);
if (view instanceof TextView) {
((TextView) view).setText(title);
} else {
throw new ClassCastException("you need give me TextView!");
}
return view;
}
public View setVisible(@IdRes int viewId) {
return setVisible(viewId, true);
}
public View setVisible(@IdRes int viewId, boolean visible) {
View view = getView(viewId);
view.setVisibility(visible ? View.VISIBLE : View.GONE);
return view;
}
public void setBackgroundColor(@IdRes int viewId, String color) {
View view = getView(viewId);
view.setBackgroundColor(Color.parseColor(color));
}
}
Adapter的条目点击OnItemClickListener
package com.sy.gwb.adapter;
/**
* Created by GongWenBo on 2018/4/7.
*/
public interface OnItemClickListener {
void onItemClick(int position);
}