ViewHolder类

public class CommonViewHolder {private final SparseArray<View> mViews;private final int mLayoutId;private int mPosition;private final View mConvertView;public int getLayoutId() {return mLayoutId;}private CommonViewHolder(ViewGroup parent, int layoutId, int position) {this.mPosition = position;this.mViews = new SparseArray<>();this.mLayoutId = layoutId;// TODOmConvertView = LayoutInflater.from(parent.getContext()).inflate(layoutId, null);mConvertView.setTag(this);}public static CommonViewHolder get(View convertView,ViewGroup parent, int layoutId, int position) {CommonViewHolder holder;if (convertView == null || ((CommonViewHolder) convertView.getTag()).getLayoutId() != layoutId) {holder = new CommonViewHolder(parent, layoutId, position);} else {holder = (CommonViewHolder) convertView.getTag();holder.mPosition = position;}return holder;}public View getConvertView() {return mConvertView;}@SuppressWarnings("unchecked")public <T extends View> T getView(int viewId) {View view = mViews.get(viewId);if (view == null) {view = mConvertView.findViewById(viewId);mViews.put(viewId, view);}return (T) view;}public CommonViewHolder setText(int viewId, String text) {TextView view = getView(viewId);view.setText(text);return this;}public CommonViewHolder setImageResource(int viewId, int drawableId) {ImageView view = getView(viewId);if (view != null) {view.setImageResource(drawableId);}return this;}public CommonViewHolder setImageBitmap(int viewId, Bitmap bm) {ImageView view = getView(viewId);view.setImageBitmap(bm);return this;}public int getPosition() {return mPosition;}}

adapter类

public abstract class CommonAdapter<T> extends BaseAdapter {protected LayoutInflater mInflater;protected Context mContext;protected List<T> mDatas = new ArrayList<>();protected final int mItemLayoutId;public CommonAdapter(Context context, T[] datas, int itemLayoutId) {mContext = context;mInflater = LayoutInflater.from(mContext);mItemLayoutId = itemLayoutId;ArrayList<T> dataList = new ArrayList<>();if (datas != null) {Collections.addAll(dataList, datas);}mDatas.addAll(dataList);}public CommonAdapter(Context context, List<T> datas, int itemLayoutId) {mContext = context;mInflater = LayoutInflater.from(mContext);mDatas.addAll(datas);mItemLayoutId = itemLayoutId;}public void updateData(List<T> datas) {mDatas.clear();mDatas.addAll(datas);notifyDataSetChanged();}public void updateData(T[] datas) {mDatas.clear();if (datas != null && datas.length != 0) {Collections.addAll(mDatas, datas);}notifyDataSetChanged();}@Overridepublic int getCount() {return mDatas == null ? 0 : mDatas.size();}@Overridepublic T getItem(int position) {return mDatas == null ? null : mDatas.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(final int position, View convertView, ViewGroup parent) {final CommonViewHolder viewHolder = getViewHolder(position, convertView, parent);convert(viewHolder, getItem(position));View view = viewHolder.getConvertView();if (parent instanceof ListView && !useCustomListSelector()) {view.setBackgroundResource(R.drawable.clickable_item_bg_selector);}return view;}public abstract void convert(CommonViewHolder helper, T item);public boolean useCustomListSelector() {return false;}public List<T> datas() {return mDatas;}private CommonViewHolder getViewHolder(int position, View convertView, ViewGroup parent) {return CommonViewHolder.get(convertView, parent, mItemLayoutId, position);}private OnItemClickListener<T> mItemClickListener;public void setOnItemClickListener(OnItemClickListener<T> listener) {mItemClickListener = listener;}public interface OnItemClickListener<T> {void onItemClick(int position, T data, View itemView);}}

资源文件

在drawable目录中添加文件clickable_item_bg_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<!--~ Copyright (c) 2018. Lorem ipsum dolor sit amet, consectetur adipiscing elit.~ Morbi non lorem porttitor neque feugiat blandit. Ut vitae ipsum eget quam lacinia accumsan.~ Etiam sed turpis ac ipsum condimentum fringilla. Maecenas magna.~ Proin dapibus sapien vel ante. Aliquam erat volutpat. Pellentesque sagittis ligula eget metus.~ Vestibulum commodo. Ut rhoncus gravida arcu.--><selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:state_enabled="false" android:state_pressed="false"><color android:color="@android:color/white"/></item><item android:state_enabled="true" android:state_pressed="false"><color android:color="@android:color/white"/></item><item android:state_enabled="true" android:state_pressed="true"><color android:color="#D9D9D9"/></item></selector>

在res目录下创建目录drawable-v21 ，添加文件 clickable_item_bg_selector.xml

<ripple xmlns:android="http://schemas.android.com/apk/res/android"android:color="#D9D9D9"><item><shape android:shape="rectangle"><solid android:color="@android:color/white" /></shape></item></ripple>

在styles.xml文件中添加以下样式，主要是去掉默认的分割线

    <style name="defaultListView"><item name="android:listSelector">@android:color/transparent</item><item name="android:divider">@null</item></style>

使用listview模版

第一步，布局文件添加listview控件

    <ListViewandroid:id="@+id/research_listview"style="@style/defaultListView"android:layout_width="match_parent"android:layout_height="match_parent"/>

第二步，创建数据bean,例如Bean

第三步，新建一个weiget的类，集中处理item的ui，例如ListItem，继承自通用的布局，例如RelativeLayout

import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;import okhttp.example.com.okhttptest.activity.bean.Bean;public class ListItem extends RelativeLayout {public ListItem(Context context) {super(context);}public ListItem(Context context, AttributeSet attrs) {super(context, attrs);}public ListItem(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}public void setup(Bean bean){//TODO 初始化界面}
}

第四步，创建item的布局文件，例如R.layout.item，并且根布局指向之前新建的weiget类

<xxx.ListItem
xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"><ImageViewandroid:id="@+id/image"android:layout_width="50dp"android:layout_height="50dp"android:layout_centerVertical="true"/><TextViewandroid:id="@+id/text"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:layout_toRightOf="@+id/image"/>
</xxx.ListItem >

第五步

在activity中实例化listview，

    private ListView mListView;private MyAdapter mAdapter;private List<Bean> mList = new ArrayList<>();@Overridepublic void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {super.onCreate(savedInstanceState, persistentState);setContentView(R.layout.activity_main);mListView = findViewById(R.id.listview);//期间可以先设置header，根据需要来弄mAdapter = new MyAdapter(this,mList,R.layout.item);mListView.setAdapter(mAdapter);}private class  MyAdapter extends CommonAdapter<Bean>{public MyAdapter(Context context, List<Bean> datas, int itemLayoutId) {super(context, datas, itemLayoutId);}@Overridepublic void convert(CommonViewHolder helper, Bean item) {ListItem widgetView = (ListItem) helper.getConvertView();widgetView.setup(item);}}

更新数据

  mAdapter.updateData(mList);