1、main.xml
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1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:layout_width="fill_parent"
5 android:layout_height="fill_parent">
6 <ListView
7 android:layout_width="fill_parent"
8 android:layout_height="fill_parent"
9 android:focusable="false"
10 android:id="@+id/lvImageList" >
11 </ListView>
12 </LinearLayout>
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2、listitem.xml
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1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="horizontal"
4 android:layout_width="fill_parent"
5 android:layout_height="?android:attr/listPreferredItemHeight">
6 <ImageView
7 android:id="@+id/itemImgImageInfo"
8 android:layout_marginTop="4dip"
9 android:layout_marginBottom="4dip"
10 android:layout_width="?android:attr/listPreferredItemHeight"
11 android:layout_height="?android:attr/listPreferredItemHeight">
12 </ImageView>
13 <TwoLineListItem xmlns:android="http://schemas.android.com/apk/res/android"
14 android:layout_width="fill_parent"
15 android:layout_height="fill_parent"
16 android:paddingLeft="4dip"
17 android:mode="twoLine">
18 <CheckedTextView
19 android:id="@+id/itemChkImageInfo"
20 android:layout_width="fill_parent"
21 android:layout_height="wrap_content"
22 android:gravity="center_vertical"
23 android:textAppearance="?android:attr/textAppearanceSmall"
24 android:checkMark="?android:attr/listChoiceIndicatorMultiple">
25 </CheckedTextView>
26 <TextView
27 android:id="@+id/itemTxtImageInfo"
28 android:layout_width="fill_parent"
29 android:layout_height="wrap_content"
30 android:gravity="center_vertical|top"
31 android:layout_marginBottom="4dip"
32 android:layout_below="@+id/itemChkImageInfo"
33 android:textAppearance="?android:attr/textAppearanceSmall">
34 </TextView>
35 </TwoLineListItem>
36 </LinearLayout>
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接着是代码：
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1 package com.android.MultipleChoiceImageList
2
3 import java.util.ArrayList
4 import java.util.HashMap
5 import java.util.List
6 import java.util.Map
7
8 import android.app.Activity
9 import android.content.Context
10 import android.database.Cursor
11 import android.graphics.Bitmap
12 import android.net.Uri
13 import android.os.Bundle
14 import android.provider.MediaStore
15 import android.provider.MediaStore.Images
16 import android.view.LayoutInflater
17 import android.view.View
18 import android.view.ViewGroup
19 import android.widget.AdapterView
20 import android.widget.CheckedTextView
21 import android.widget.ImageView
22 import android.widget.ListView
23 import android.widget.SimpleAdapter
24 import android.widget.TextView
25 import android.widget.AdapterView.OnItemClickListener
26
27 public class MainActivity extends Activity {
28
29 private ListView lvImageList
30
31 private String imageID= "imageID"
32 private String imageName = "imageName"
33 private String imageInfo = "imageInfo"
34
35 private ArrayList<String>fileNames = new ArrayList<String>()
36
37 private MultipleChoiceImageListAdapter mAdapter
38
39 /** Called when the activity is first created. */
40 @Override
41 public void onCreate(Bundle savedInstanceState) {
42 super.onCreate(savedInstanceState)
43 setContentView(R.layout.main)
44
45 lvImageList=(ListView) this.findViewById(R.id.lvImageList)
46 lvImageList.setItemsCanFocus(false)
47 lvImageList.setOnItemClickListener(new OnItemClickListener() {
48 @Override
49 public void onItemClick(AdapterView<?>parent, View view, int position, long id) {
50
51 CheckedTextView checkedTextView = (CheckedTextView) view.findViewById(R.id.itemChkImageInfo)
52 checkedTextView.toggle()
53 mAdapter.setCheckItem(position, checkedTextView.isChecked())
54 }
55 })
56 try{
57 String[] from = {imageID, imageName, imageInfo}
58 int[] to = {R.id.itemImgImageInfo, R.id.itemChkImageInfo, R.id.itemTxtImageInfo}
59 mAdapter = new MultipleChoiceImageListAdapter(MainActivity.this, GetImageList(), R.layout.listitem, from, to)
60 lvImageList.setAdapter(mAdapter)
61 }
62 catch(Exception ex){
63 return
64 }
65 }
66
67 //获取图片列表
68 private ArrayList<Map<String, String>>GetImageList(){
69
70 ArrayList<Map<String, String>>imageList = new ArrayList<Map<String,String>>()
71 HashMap<String, String>imageMap
72
73 //读取SD卡中所有图片
74 Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
75 String[] projection = { MediaStore.Images.Media._ID, MediaStore.Images.Media.DISPLAY_NAME,MediaStore.Images.Media.DATA, MediaStore.Images.Media.SIZE}
76 String selection = MediaStore.Images.Media.MIME_TYPE + "=?"
77 String[] selectionArg ={"image/jpeg"}
78 Cursor mCursor = this.managedQuery(uri, projection, selection, selectionArg, MediaStore.Images.Media.DISPLAY_NAME)
79 imageList.clear()
80 if (mCursor != null) {
81 mCursor.moveToFirst()
82 while (mCursor.getPosition() != mCursor.getCount())
83 {
84 imageMap= new HashMap<String, String>()
85 imageMap.put(imageID, mCursor.getString(mCursor.getColumnIndex(MediaStore.Images.Media._ID)))
86 imageMap.put(imageName, mCursor.getString(mCursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME)))
87 imageMap.put(imageInfo, " " + (mCursor.getLong(mCursor.getColumnIndex(MediaStore.Images.Media.SIZE))/1024)+"KB")
88 imageList.add(imageMap)
89 fileNames.add(mCursor.getString(mCursor.getColumnIndex(MediaStore.Images.Media.DATA)))
90 mCursor.moveToNext()
91 }
92 mCursor.close()
93 }
94 return imageList
95 }
96
97 //可多选图片列表适配器
98 class MultipleChoiceImageListAdapter extends SimpleAdapter {
99
100 private Map<Integer, Boolean>map
101 private List<Integer>state
102 private List<? extends Map<String, ?>>mList
103
104 LayoutInflater mInflater
105
106 public MultipleChoiceImageListAdapter(Context context, List<Map<String, String>>data, int resource, String[] from, int[] to) {
107 super(context, data, resource, from, to)
108 map = new HashMap<Integer, Boolean>()
109 mInflater = LayoutInflater.from(context)
110 mList = data
111 for(int i = 0i <data.size()i++) {
112 map.put(i, false)
113 }
114 state = new ArrayList<Integer>()
115 }
116
117 @Override
118 public int getCount() {
119 return mList.size()
120 }
121
122 @Override
123 public Object getItem(int position) {
124 return position
125 }
126
127 @Override
128 public long getItemId(int position) {
129 return position
130 }
131
132 //设置条目选中状态
133 public void setCheckItem(int position, Boolean isChecked){
134 map.put(position, isChecked)
135 if (state.contains(position))
136 state.remove((Object)position)
137 if (isChecked){
138 state.add(position)
139 }
140 }
141
142 //获取列表中已选中条目
143 public long[] getCheckItemIds(){
144 int count = state.size()
145 long[] ids = new long[count]
146 for (int i = 0i <counti++) {
147 ids[i]= (long)state.get(i)
148 }
149 return ids
150 }
151
152 @Override
153 public View getView(int position, View convertView, ViewGroup parent) {
154 if(convertView == null) {
155 convertView = mInflater.inflate(R.layout.listitem, null)
156 }
157
158 CheckedTextView checkedTextView = (CheckedTextView) convertView.findViewById(R.id.itemChkImageInfo)
159 checkedTextView.setChecked(map.get(position))
160 checkedTextView.setText((String)mList.get(position).get(imageName))
161
162 TextView textView = (TextView) convertView.findViewById(R.id.itemTxtImageInfo)
163 textView.setText((String)mList.get(position).get(imageInfo))
164
165 //显示图片缩略图
166 ImageView image = (ImageView) convertView.findViewById(R.id.itemImgImageInfo)
167 Bitmap bm = MediaStore.Images.Thumbnails.getThumbnail(getContentResolver(), Long.parseLong((String)mList.get(position).get(imageID)), Images.Thumbnails.MICRO_KIND, null)
168 image.setImageBitmap(bm)
169
170 return convertView
171 }
172 }
173 }
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Arraylist数据结构： 集合底层使用动态数组实现，随机查询效率非常快，插入和删除需要移动整个数组、效率低。
相关文章链接：
<<<Java集合类图总览
<<<ArrayList的动态扩容、ModCount及fail-fast原理
<<<LinkedList增删改查 *** 作底层实现原理
<<<数组拷贝的几种方式及和链表结构的对比
<<<Jdk1.7HashMap源码分析
<<<Jdk1.7HashMap如何扩容及解决死循环问题
<<<JDK1.8HashMap源码分析
<<<ConcurrentHashMap在JDK1.8版本比1.7改进了什么
<<<JDK8的HashMap中红黑树左旋右旋原理图解
<<<基于LinkedHashMap手写LRU淘汰策略
<<<HashSet集合底层实现原理
<<<HashTable底层实现原理及和ConcurrentHashMap区别
<<<java集合常见面试题
ArrayList按索引删除即可，然后adapter调用notifydatasetchanged方法。比如ArrayList对象是 list, SimpleAdapter对象是adapter, 那么:
list.remove(4)
list.remove(6)
adapter.notifyDataSetChanged()
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