Android实现便于批量操作可多选的图片ListView实例

<?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">
  <listview
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:focusable="false"
    android:id="@+id/lvimagelist" >
  </listview>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="horizontal"
  android:layout_width="fill_parent"
  android:layout_height="?android:attr/listpreferreditemheight">
  <imageview
    android:id="@+id/itemimgimageinfo"
    android:layout_margintop="4dip"
    android:layout_marginbottom="4dip"
    android:layout_width="?android:attr/listpreferreditemheight"
    android:layout_height="?android:attr/listpreferreditemheight">
  </imageview>
  <twolinelistitem xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:paddingleft="4dip"
    android:mode="twoline">
    <checkedtextview
      android:id="@+id/itemchkimageinfo"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:gravity="center_vertical"
      android:textappearance="?android:attr/textappearancesmall"
      android:checkmark="?android:attr/listchoiceindicatormultiple">
    </checkedtextview>
    <textview
      android:id="@+id/itemtxtimageinfo"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:gravity="center_vertical|top"
      android:layout_marginbottom="4dip"
      android:layout_below="@+id/itemchkimageinfo"
      android:textappearance="?android:attr/textappearancesmall">
    </textview>
  </twolinelistitem>
</linearlayout>

package com.android.multiplechoiceimagelist;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import android.app.activity;
import android.content.context;
import android.database.cursor;
import android.graphics.bitmap;
import android.net.uri;
import android.os.bundle;
import android.provider.mediastore;
import android.provider.mediastore.images;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.adapterview;
import android.widget.checkedtextview;
import android.widget.imageview;
import android.widget.listview;
import android.widget.simpleadapter;
import android.widget.textview;
import android.widget.adapterview.onitemclicklistener;
public class mainactivity extends activity {
  private listview lvimagelist;
  private string imageid= "imageid";
  private string imagename = "imagename";
  private string imageinfo = "imageinfo";
  private arraylist<string> filenames = new arraylist<string>();
  private multiplechoiceimagelistadapter madapter;
  /** called when the activity is first created. */
  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.main);
    lvimagelist=(listview) this.findviewbyid(r.id.lvimagelist);
    lvimagelist.setitemscanfocus(false);
    lvimagelist.setonitemclicklistener(new onitemclicklistener() {
      @override
      public void onitemclick(adapterview<?> parent, view view, int position, long id) {
        checkedtextview checkedtextview = (checkedtextview) view.findviewbyid(r.id.itemchkimageinfo);
        checkedtextview.toggle();
        madapter.setcheckitem(position, checkedtextview.ischecked());
      }
    });
    try{
      string[] from = {imageid, imagename, imageinfo};
      int[] to = {r.id.itemimgimageinfo, r.id.itemchkimageinfo, r.id.itemtxtimageinfo};
      madapter = new multiplechoiceimagelistadapter(mainactivity.this, getimagelist(), r.layout.listitem, from, to);
      lvimagelist.setadapter(madapter);
    }
    catch(exception ex){
      return;
    }
  }
  //获取图片列表
  private arraylist<map<string, string>> getimagelist(){
    arraylist<map<string, string>> imagelist = new arraylist<map<string,string>>();
    hashmap<string, string> imagemap;
    //读取sd卡中所有图片
    uri uri = mediastore.images.media.external_content_uri;
    string[] projection = { mediastore.images.media._id, mediastore.images.media.display_name,mediastore.images.media.data, mediastore.images.media.size};
    string selection = mediastore.images.media.mime_type + "=?";
    string[] selectionarg ={"image/jpeg"};
    cursor mcursor = this.managedquery(uri, projection, selection, selectionarg, mediastore.images.media.display_name);
    imagelist.clear();
    if (mcursor != null) {
      mcursor.movetofirst();
      while (mcursor.getposition() != mcursor.getcount())
      {
        imagemap= new hashmap<string, string>();
        imagemap.put(imageid, mcursor.getstring(mcursor.getcolumnindex(mediastore.images.media._id)));
        imagemap.put(imagename, mcursor.getstring(mcursor.getcolumnindex(mediastore.images.media.display_name)));
        imagemap.put(imageinfo, " " + (mcursor.getlong(mcursor.getcolumnindex(mediastore.images.media.size))/1024)+"kb");
        imagelist.add(imagemap);
        filenames.add(mcursor.getstring(mcursor.getcolumnindex(mediastore.images.media.data)));
        mcursor.movetonext();
      }
      mcursor.close();
    }
    return imagelist;
  }
  //可多选图片列表适配器
  class multiplechoiceimagelistadapter extends simpleadapter {
    private map<integer, boolean> map;
    private list<integer> state;
    private list<? extends map<string, ?>> mlist;
    layoutinflater minflater;
    public multiplechoiceimagelistadapter(context context, list<map<string, string>> data, int resource, string[] from, int[] to) {
      super(context, data, resource, from, to);
      map = new hashmap<integer, boolean>();
      minflater = layoutinflater.from(context);
      mlist = data;
      for(int i = 0; i < data.size(); i++) {
        map.put(i, false);
      }
      state = new arraylist<integer>();
    }
    @override
    public int getcount() {
      return mlist.size();
    }
    @override
    public object getitem(int position) {
      return position;
    }
    @override
    public long getitemid(int position) {
      return position;
    }
    //设置条目选中状态
    public void setcheckitem(int position, boolean ischecked){
      map.put(position, ischecked);
      if (state.contains(position))
        state.remove((object)position);
      if (ischecked){
        state.add(position);
      }
    }
    //获取列表中已选中条目
    public long[] getcheckitemids(){
      int count = state.size();
      long[] ids = new long[count];
      for (int i = 0; i < count; i++) {
        ids[i]= (long)state.get(i);
      }
      return ids;
    }
    @override
    public view getview(int position, view convertview, viewgroup parent) {
      if(convertview == null) {
        convertview = minflater.inflate(r.layout.listitem, null);
      }
      checkedtextview checkedtextview = (checkedtextview) convertview.findviewbyid(r.id.itemchkimageinfo);
      checkedtextview.setchecked(map.get(position));
      checkedtextview.settext((string)mlist.get(position).get(imagename));
      textview textview = (textview) convertview.findviewbyid(r.id.itemtxtimageinfo);
      textview.settext((string)mlist.get(position).get(imageinfo));
      //显示图片缩略图
      imageview image = (imageview) convertview.findviewbyid(r.id.itemimgimageinfo);
      bitmap bm = mediastore.images.thumbnails.getthumbnail(getcontentresolver(), long.parselong((string)mlist.get(position).get(imageid)), images.thumbnails.micro_kind, null);
      image.setimagebitmap(bm);
      return convertview;
    }
  }
}