一、概述
public boolean onCreateOptionsMenu(Menu menu)：使用此方法调用OptionsMenu 。
public boolean onOptionsItemSelected(MenuItem item)：选中菜单项后发生的动作。
public void onOptionsMenuClosed(Menu menu):菜单关闭后发生的动作。
public boolean onPrepareOptionsMenu(Menu menu)：选项菜单显示之前onPrepareOptionsMenu方法会被调用，你可以用此方法来根据打当时的情况调整菜单。
public boolean onMenuOpened(int featureId, Menu menu)：单打开后发生的动作。
二、默认样式
默认样式是在屏幕底部d出一个菜单，这个菜单我们就叫他选项菜单OptionsMenu，一般情况下，选项菜单最多显示2排每排3个菜单项，这些菜单项有文字有图标，也被称作Icon Menus，如果多于6项，从第六项开始会被隐藏，在第六项会出现一个More里，点击More才出现第六项以及以后的菜单项，这些菜单项也被称作Expanded Menus。下面介绍。
1.main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="请点击 Menu键显示选项菜单" android:id="@+id/TextView02" />
</LinearLayout>
2.重载onCreateOptionsMenu(Menu menu)方法
重载onCreateOptionsMenu(Menu menu)方法，并在此方法中添加菜单项，最后返回true，如果false，菜单则不会显示。
3.为菜单项注册事件
使用onOptionsItemSelected(MenuItem item)方法为菜单项注册事件
public boolean onOptionsItemSelected(MenuItem item)
先是两个layout：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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