背景：
本来想用选择器实现，结果各种不管用
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="/apk/res/android"><item android:drawable="@color/holo_orange_dark" android:state_selected="true" /><item android:drawable="@color/holo_orange_dark" android:state_pressed="true" /><item android:drawable="@color/holo_orange_dark" android:state_checked="true" /><item android:drawable="@color/holo_orange_dark" android:state_focused="true" /><item android:drawable="@color/no_white" android:state_focused="false" /><item android:drawable="@color/no_white" android:state_selected="false" /></selector>
实现思路：
在adapter中添加setThisPosition方法进行点击条目定位，并且调用 notifyDataSetChanged();自动执行一次adapter的getView方法，即进行按下状态的判断显示；执行点击监听时，执行一次adapter的setThisPosition(position)方法时把位置传进去，非常巧妙。
核心在Adapter实现
1dapter中添加setThisPosition方法
//先声明一个int成员变量,若为0默认显示第一个private int thisPosition = -1;//再定义一个int类型的返回值方法public int getthisPosition() {return thisPosition;}//其次定义一个方法用来绑定当前参数值的方法//此方法是在调用此适配器的地方调用的，此适配器内不会被调用到public void setThisPosition(int thisPosition) {this.thisPosition = thisPosition;// 执行构造器的getView方法notifyDataSetChanged();}
2 getView回调方法中进行点击与否状态判断
if (position == getthisPosition()) {// Log.e("wy", "onBindViewHolder: ");// viewHolder.itemView.setBackgroundResource(R.color.yellow_ui);viewHolder.itemView.setBackgroundResource(R.drawable.top_checked);} else {viewHolder.itemView.setBackgroundResource(R.drawable.top_normal);}
3 listview点击监听中执行mAdapter.setThisPosition(position);触发一切
LvServiceCustomDetailAdapter lvServiceCustomDetailAdapter = new LvServiceCustomDetailAdapter(professionInfo.getData(), ServiceCustomDetailActivity.this);lvServiceCustomDetail.setAdapter(lvServiceCustomDetailAdapter);lvServiceCustomDetail.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {lvServiceCustomDetailAdapter.setThisPosition(position);}});
Adapter全代码
package com.wintec.huashang.adapter;import android.content.Context;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.TextView;import com.wintec.huashang.Constant;import com.wintec.huashang.R;import java.util.List;import androidx.recyclerview.widget.RecyclerView;public class GalleryAdapter extendsRecyclerView.Adapter<GalleryAdapter.ViewHolder> {public interface OnItemClickLitener {void onItemClick(View view, int position);}private OnItemClickLitener mOnItemClickLitener;public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener) {this.mOnItemClickLitener = mOnItemClickLitener;}ViewHolder viewHolder;private LayoutInflater mInflater;private List<String> mDatas;Context mContext;// private int selectedPosition = -5; //默认一个参数public GalleryAdapter(Context context, List<String> datats) {mContext = context;mInflater = LayoutInflater.from(context);mDatas = datats;}//先声明一个int成员变量,若为0默认显示第一个private int thisPosition = -1;//再定义一个int类型的返回值方法public int getthisPosition() {return thisPosition;}//其次定义一个方法用来绑定当前参数值的方法//此方法是在调用此适配器的地方调用的，此适配器内不会被调用到public void setThisPosition(int thisPosition) {this.thisPosition = thisPosition;notifyDataSetChanged();}// int a = -1;// public void setSelectFlag(int flag){// if (flag==a) {// return;// }// a = flag;// notifyDataSetChanged();// }public static class ViewHolder extends RecyclerView.ViewHolder {public ViewHolder(View arg0) {super(arg0);}ImageView mImg;TextView mTxt;RelativeLayout mRecyclerRl;}public void setmDatas(List<String> datas) {// 清除ReclyclerView条目选中状态thisPosition = -1;if (mDatas != null) {mDatas.clear();this.notifyDataSetChanged();}mDatas.addAll(datas);// selectedPosition = -5;this.notifyDataSetChanged();}public void clearnChecked() {viewHolder.mRecyclerRl.setFocusable(false);viewHolder.mRecyclerRl.clearFocus();viewHolder.itemView.setBackgroundResource(R.color.white);// selectedPosition = -5;// 清除ReclyclerView条目选中状态thisPosition = -1;this.notifyDataSetChanged();}@Overridepublic int getItemCount() {return mDatas.size();}/*** 创建ViewHolder*/@Overridepublic ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {View view = mInflater.inflate(R.layout.activity_index_gallery_item,viewGroup, false);// ViewHolder viewHolder = new ViewHolder(view);viewHolder = new ViewHolder(view);// if (!listItem.isSelect()){// viewHolder.relativeLayout.setBackgroundColor(Color.WHITE);// }else {// viewHolder.relativeLayout.setBackgroundColor(Color.parseColor("#ff00ff"));// }// viewHolder.mImg = (ImageView) view//.findViewById(R.id.id_index_gallery_item_image);viewHolder.mTxt = (TextView) view.findViewById(R.id.id_index_gallery_item_text);viewHolder.mRecyclerRl = (RelativeLayout) view.findViewById(R.id.recycler_rl);return viewHolder;}/*** 设置值*/@Overridepublic void onBindViewHolder(final ViewHolder viewHolder, final int position) {// Log.e("wy", "onBindViewHolder: " + position+"getthisPosition(): "+getthisPosition());if (position == getthisPosition()) {// Log.e("wy", "onBindViewHolder: ");// viewHolder.itemView.setBackgroundResource(R.color.yellow_ui);viewHolder.itemView.setBackgroundResource(R.drawable.top_checked);} else {viewHolder.itemView.setBackgroundResource(R.drawable.top_normal);}// viewHolder.mImg.setImageResource(mDatas.get(position));// viewHolder.itemView.setSelected(selectedPosition == position);// if (selectedPosition == position) {// viewHolder.mTxt.setVisibility(View.VISIBLE);// } else {// viewHolder.mTxt.setVisibility(View.INVISIBLE);// }viewHolder.mTxt.setText(mDatas.get(position) + "");// viewHolder.itemView.setOnClickListener(new View.OnClickListener() {// @Override// public void onClick(final View v) {//Toast.makeText(mContext, "点击的位置："+position +"点击的内容： "+mDatas.get(position), Toast.LENGTH_SHORT).show();//// }// });//如果设置了回调，则设置点击事件if (mOnItemClickLitener != null) {//按下选中// viewHolder.itemView.setOnFocusChangeListener(new View.OnFocusChangeListener() {//@Override//public void onFocusChange(View v, boolean hasFocus) {//// TODO: 20/4/26//mOnItemClickLitener.onItemClick(viewHolder.itemView, position);//}// });viewHolder.itemView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {mOnItemClickLitener.onItemClick(viewHolder.itemView, position);Log.e("wy", "run: " + "点击了ReclycerView条目");Constant.isUpLoadErrorListReclyclerView = true;//setSelectFlag(position);//ListItem listItem = this.getData().get(position);}});// if(a != -1&& position == a){viewHolder.itemView.setSelected(true);////viewHolder.itemView.setBackgroundResource(R.color.yellow_ui);// }}}}
调用
//得到控件mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview_horizontal);//设置布局管理器LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);mRecyclerView.setLayoutManager(linearLayoutManager);//设置适配器mAdapter = new GalleryAdapter(this, mDatas);mAdapter.setOnItemClickLitener(new GalleryAdapter.OnItemClickLitener() {@Overridepublic void onItemClick(View view, int position) {mAdapter.setThisPosition(position);}});mRecyclerView.setAdapter(mAdapter);
