字符串数组 ArrayAdapter
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ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1,new String[]{"111","222","333"}); |
List<Map<String, Object>>数组 SimpleAdapter
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SimpleAdapter myAdapter = new SimpleAdapter(this, listitem, R.layout.list_item, new String[]{"icon", "name", "desc"}, new int[]{R.id.icon, R.id.name, R.id.desc}); |
子布局 list_item.xml
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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <!-- 定义一个用于显示头像的 ImageView --> <ImageView android:id="@+id/icon" android:layout_width="42dp" android:layout_height="45dp" android:baselineAlignBottom="true" android:paddingLeft="8dp" /> <!-- 定义一个竖直方向的 LinearLayout,把 语言 与 简介 的文本框设置出来 --> <LinearLayout android:layout_width="match_parent" android:layout_height="45dp" android:orientation="vertical"> <TextView android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingLeft="8dp" android:textColor="#1D1D1C" android:textSize="20sp" /> <TextView android:id="@+id/desc" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingLeft="8px" android:textColor="#B4B4B9" android:textSize="14sp" /> </LinearLayout> </LinearLayout> |
空数据时候的视图 listview_empty.xml
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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="没有数据可以显示"/> </LinearLayout> |
布局
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<ListView android:id="@+id/listview2" android:layout_width="match_parent" android:footerDividersEnabled="true" android:cacheColorHint="#00000000" android:dividerHeight="2dp" android:layout_height="100dp" /> <include android:id="@+id/listview3Empty" layout="@layout/listview_empty"/> <ListView android:id="@+id/listview3" android:layout_width="match_parent" android:footerDividersEnabled="true" android:cacheColorHint="#00000000" android:dividerHeight="2dp" android:layout_height="200dp" /> |
SimpleAdapter
数据
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private String[] langs = new String[]{ "Kotlin", "Scala", "Swift", "TypeScript" }; private String[] descs = new String[]{ "Kotlin 是运行在 Java 虚拟机上的静态语言，被称之为 Android 世界的 Swift", "Scala 是一门多范式（multi-paradigm）的编程语言", "Swift 是开发 Mac APP 和 iOS APP 的语言", "TypeScript 是一种由微软开发的自由和开源的编程语言" }; private int[] icons = new int[]{ R.drawable.kotlin, R.drawable.scala, R.drawable.swift, R.drawable.typescript }; |
使用
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@BindView(R.id.listview2) ListView listview2; ...... List<Map<String, Object>> listitem = new ArrayList<Map<String, Object>>(); for (int i = 0; i < langs.length; i++) { Map<String, Object> showitem = new HashMap<String, Object>(); showitem.put("icon", icons[i]); showitem.put("name", langs[i]); showitem.put("desc", descs[i]); listitem.add(showitem); } //创建一个simpleAdapter SimpleAdapter myAdapter = new SimpleAdapter(this, listitem, R.layout.list_item, new String[]{"icon", "name", "desc"}, new int[]{R.id.icon, R.id.name, R.id.desc}); listview2.setAdapter(myAdapter); |
自定义Adapter适配器
数据对象
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package com.example.test.myapplication.domain; public class YetLanguage { private String aName; private String aDesc; private int aIcon; private YetLanguage() { } public YetLanguage(String aName, String aDesc, int aIcon) { this.aName = aName; this.aDesc = aDesc; this.aIcon = aIcon; } ..... }继承 |
适配器
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package com.example.test.myapplication.adapter; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; import com.example.test.myapplication.R; import com.example.test.myapplication.domain.YetLanguage; import java.util.LinkedList; public class YetAdapter extends BaseAdapter { private LinkedList<YetLanguage> mData; private Context mContext; private YetAdapter() { } public YetAdapter(LinkedList<YetLanguage> mData, Context mContext) { this.mData = mData; this.mContext = mContext; } public void add(YetLanguage language){ this.mData.add(language); //必须通知更新，否则无效 notifyDataSetChanged(); } public void add(int idx, YetLanguage language){ this.mData.add(idx, language); //必须通知更新，否则无效 notifyDataSetChanged(); } public YetLanguage remove(int idx){ YetLanguage language = this.mData.remove(idx); notifyDataSetChanged(); //必须通知更新，否则无效 return language; } public void clear() { mData.clear(); //必须通知更新，否则无效 notifyDataSetChanged(); } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { //避免重复载入 ViewHolder holder = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item, parent, false); holder = new ViewHolder(); holder.icon = (ImageView) convertView.findViewById(R.id.icon); holder.name = (TextView) convertView.findViewById(R.id.name); holder.desc = (TextView) convertView.findViewById(R.id.desc); convertView.setTag(holder); //将Holder存储到convertView中 } else { holder = (ViewHolder) convertView.getTag(); } //设定子布局信息 holder.icon.setBackgroundResource(mData.get(position).getaIcon()); holder.name.setText(mData.get(position).getaName()); holder.desc.setText(mData.get(position).getaDesc()); return convertView; } /** * ViewHolder 重用组件 */ static class ViewHolder { ImageView icon; TextView name; TextView desc; } } |
使用
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@BindView(R.id.listview3) ListView listview3; @BindView(R.id.listview3Empty) View listview3Empty; YetAdapter yetAdapter = null; ...... List<YetLanguage> mData = new LinkedList<YetLanguage>(); //初始化 mData.add(new YetLanguage("Kotlin", "Kotlin 是运行在 Java 虚拟机上的静态语言，被称之为 Android 世界的 Swift", R.drawable.kotlin)); //mData.add(new YetLanguage("Scala", "Scala 是一门多范式（multi-paradigm）的编程语言", R.drawable.scala)); //mData.add(new YetLanguage("Swift", "Swift 是开发 Mac APP 和 iOS APP 的语言", R.drawable.swift)); //mData.add(new YetLanguage("TypeScript", "TypeScript 是一种由微软开发的自由和开源的编程语言", R.drawable.typescript)); //创建一个 YetAdapter yetAdapter = new YetAdapter((LinkedList<YetLanguage>) mData,getApplicationContext()); listview3.setEmptyView(listview3Empty); listview3.setAdapter(yetAdapter); //使用适配器的方式来动态增加 yetAdapter.add(new YetLanguage("Swift", "Swift 是开发 Mac APP 和 iOS APP 的语言", R.drawable.swift)); |
ListView列表中获取EditText输入的值 https://blog.csdn.net/DickyQie/article/details/78036462
Android 可复用 BaseAdapter https://www.twle.cn/l/yufei/android/android-basic-customer-baseadapter.html
一个通用的适配器 用法参考： https://www.twle.cn/l/yufei/android/android-basic-gridview.html
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package com.pandy.app.adapter; import android.content.Context; import android.util.SparseArray; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.Switch; import android.widget.TextView; import java.util.ArrayList; import java.util.List; public abstract class AbsCommAdapter<T> extends BaseAdapter { private List<T> mData; private int mLayoutRes; private AbsCommAdapter() { } /** * * @param mData 数据。 * @param mLayoutRes 单个对象所映射的子布局，例如 list_item.xml。 */ public AbsCommAdapter(List<T> mData, int mLayoutRes) { this.mData = mData; this.mLayoutRes = mLayoutRes; } /** * 设定每一行元素对应的方法 * @param holder * @param obj */ public abstract void bindView(ViewHolder holder, T obj); @Override public int getCount() { return mData != null ? mData.size() : 0; } @Override public T getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = ViewHolder.bind(parent.getContext(), convertView, parent, mLayoutRes , position); bindView(holder, getItem(position)); return holder.getConvertViewView(); } //添加一个元素 public void add(T data) { if (mData == null) { mData = new ArrayList<>(); } mData.add(data); notifyDataSetChanged(); } //往特定位置，添加一个元素 public void add(int position, T data) { if (mData == null) { mData = new ArrayList<>(); } mData.add(position, data); notifyDataSetChanged(); } public void addAll(List<T> data) { if (mData == null) { mData = new ArrayList<>(); } mData.addAll(data); notifyDataSetChanged(); } public void remove(T data) { if (mData != null) { mData.remove(data); } notifyDataSetChanged(); } public void remove(int position) { if (mData != null) { mData.remove(position); } notifyDataSetChanged(); } public void removeAll() { if (mData != null) { mData.clear(); } notifyDataSetChanged(); } public void clear() { if (mData != null) { mData.clear(); } notifyDataSetChanged(); } /** * 内部数据处理 */ public static class ViewHolder { private SparseArray<View> mViews; //存储ListView 的 item中的View private View convertView; //存放convertView private int position; //游标 private Context context; //Context上下文 //构造方法，完成相关初始化 private ViewHolder(Context context, ViewGroup parent, int layoutRes) { mViews = new SparseArray<>(); this.context = context; convertView = LayoutInflater.from(context).inflate(layoutRes, parent, false); convertView.setTag(this); //convertView = convertView; } //绑定ViewHolder与convertView public static ViewHolder bind(Context context, View convertView, ViewGroup parent, int layoutRes, int position) { ViewHolder holder; if (convertView == null) { holder = new ViewHolder(context, parent, layoutRes); } else { holder = (ViewHolder) convertView.getTag(); holder.convertView = convertView; } holder.position = position; return holder; } /** * 获得空间 * * @param id * @param <T> * @return */ @SuppressWarnings("unchecked") private <T extends View> T getView(int id) { T t = (T) mViews.get(id); if (t == null) { t = (T) convertView.findViewById(id); mViews.put(id, t); } return t; } /** * 获取当前条目 */ public View getConvertViewView() { return convertView; } /** * 获取条目位置 */ public int getItemPosition() { return getPosition(); } /** * 获取条目位置 */ public int getPosition() { return position; } /** * 设置标签 */ private ViewHolder setTag(int id, Object obj) { getView(id).setTag(obj); return this; } /** * 设置点击监听 */ public ViewHolder setOnClickListener(int id, View.OnClickListener listener) { getView(id).setOnClickListener(listener); return this; } /** * 设置可见 */ public ViewHolder setVisibility(int id, int visible) { getView(id).setVisibility(visible); return this; } /** * 设置文字 */ public ViewHolder setText(int id, CharSequence text) { TextView view = getView(id); if (view instanceof TextView) { ((TextView) view).setText(text); } return this; } /** * 读取文字 */ public CharSequence getText(int id) { View view = getView(id); if (view instanceof TextView) { return ((TextView) view).getText(); } return null; } /** * 设置图片 */ public ViewHolder setImageResource(int id, int drawableRes) { View view = getView(id); if (view instanceof ImageView) { ((ImageView) view).setImageResource(drawableRes); } else { view.setBackgroundResource(drawableRes); } return this; } /** * 设置选中 */ public ViewHolder setSwitchCheck(int id, boolean checked) { Switch view = getView(id); if (view instanceof Switch) { ((Switch) view).setChecked(checked); } return this; } /** * 设置选中 */ public Switch getSwitch(int id) { Switch view = getView(id); return view; } //其他方法可自行扩展 } } |
