巧妙解决RecycleView的复用问题,不用model层
2018-04-19 本文已影响0人
Master_文
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
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/rv_show"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.sy.gwb.ui.activity.DiscountCouponActivity">
</android.support.v7.widget.RecyclerView>
item布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns: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:orientation="vertical">
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/cv_discount_coupon"
android:layout_width="345dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="10dp"
android:gravity="center_horizontal"
android:orientation="vertical"
app:cardCornerRadius="8dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/rl_discount_coupon_header"
android:layout_width="match_parent"
android:layout_height="81dp"
android:background="#FFFBB82F">
<View
android:id="@+id/view_center"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_centerInParent="true"/>
<TextView
android:id="@+id/tv_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="21dp"
android:text="¥30"
android:textColor="#FFFFFFFF"
android:textSize="16sp"/>
<View
android:layout_width="4dp"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_marginRight="76dp"
android:background="@mipmap/icon_dashed"/>
<TextView
android:id="@+id/tv_discount_coupon_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@id/view_center"
android:layout_marginBottom="2dp"
android:layout_marginLeft="15dp"
android:text="优惠券"
android:textColor="#FFFFFFFF"
android:textSize="16sp"/>
<TextView
android:id="@+id/tv_discount_coupon_desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@id/tv_discount_coupon_name"
android:layout_below="@id/view_center"
android:layout_marginTop="2dp"
android:text="选我就对了"
android:textColor="#FFFFFFFF"
android:textSize="12sp"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="31dp"
android:layout_below="@id/rl_discount_coupon_header"
android:background="@color/white">
<TextView
android:id="@+id/tv_discount_coupon_validity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="13dp"
android:text="有效期：2018.03.12-2018.08.01"
android:textColor="#FF828282"
android:textSize="12sp"/>
<ImageView
android:id="@+id/iv_select"
android:layout_width="22dp"
android:layout_height="22dp"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="5dp"
android:src="@mipmap/normal_selected"
android:visibility="gone"/>
</RelativeLayout>
<View
android:layout_width="match_parent"
android:layout_height="4dp"
android:layout_alignBottom="@id/rl_discount_coupon_header"
android:layout_marginTop="10dp"
android:background="@mipmap/discount_coupon_line"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
<View
android:id="@+id/view"
android:layout_width="match_parent"
android:layout_height="68dp"/>
</LinearLayout>
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<String>, OnItemClickListener {
@BindView(R.id.rv_show)
RecyclerView mRvShow;
private List<String> 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<T> extends RecyclerView.Adapter<BaseViewHolder> implements View.OnClickListener {
private List<T> mDatas;
private Context mContext;
private int layoutId;
private BaseAdapterListener mBaseAdapterListener;
private OnItemClickListener mOnItemClickListener;
public BaseAdapter(List<T> 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<T> {
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<View> views;
public BaseViewHolder(View itemView) {
super(itemView);
this.views = new SparseArray<>();
this.itemView = itemView;
}
public <T extends View> 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);
}
