Android编程实现在adapter中进行数据操作的方法

本文实例讲述了android编程实现在adapter中进行数据操作的方法。分享给大家供大家参考，具体如下：

package com.cvte.apkclassify;
import java.util.arraylist;
import android.content.context;
import android.content.pm.applicationinfo;
import android.content.pm.packageinfo;
import android.content.pm.packagemanager;
import android.content.pm.packagemanager.namenotfoundexception;
import android.graphics.drawable.drawable;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.imageview;
import android.widget.textview;
public class itemadapter extends baseadapter {
  private context context;
  private layoutinflater inflater;
  private packagemanager pmanager ;
  private arraylist<packageinfo> apps;
  private arraylist<apkbean> allapkbeans;
  private apkbean bean = new apkbean();
  private dbutils utils ;
  private applicationinfo appinfo;
  private static int ll = 1;
  public itemadapter(context c) {
    super();
    this.context = c;
    pmanager = context.getpackagemanager();
    apps = (arraylist<packageinfo>) getallappinfo.getallapps(context);
    utils = new dbutils(context);
    allapkbeans = (arraylist<apkbean>) utils.getallrecords();
    for (int i = 0; i < apps.size(); i++) {
      bean = new apkbean();
      bean.setapkname(pmanager.getapplicationlabel(apps.get(i).applicationinfo).tostring());
      bean.setkind(0);
      bean.setpackagename(apps.get(i).applicationinfo.packagename);
      utils.insert(bean);
    }
  }
  @override
  public int getcount() {
    // todo auto-generated method stub
    return apps.size();
  }
  @override
  public object getitem(int position) {
    // todo auto-generated method stub
    return apps.get(position);
  }
  @override
  public long getitemid(int position) {
    // todo auto-generated method stub
    return 0;
  }
  @override
  public view getview(int position, view view, viewgroup parent) {
    viewholder holder = null;
    inflater = layoutinflater.from(context);
    if (view==null) {
      holder = new viewholder();
      view = inflater.inflate(r.layout.listitem, null);
      holder.apkimage = (imageview)view.findviewbyid(r.id.apkimage);
      holder.apkname =(textview)view.findviewbyid(r.id.apkname);
      holder.result = (textview)view.findviewbyid(r.id.result);
      view.settag(holder);
    }else{
      holder=(viewholder)view.gettag();
    }
    if (allapkbeans==null||allapkbeans.size()==0) {
      packageinfo pinfo = apps.get(position);
      string name = pmanager.getapplicationlabel(pinfo.applicationinfo).tostring();
      holder.apkimage.setbackgrounddrawable(pmanager.getapplicationicon(pinfo.applicationinfo));
      holder.apkname.settext(name);
      holder.result.settext("未分类");
    }else{
      apkbean bean = allapkbeans.get(position);
      holder.apkimage.setbackgrounddrawable( geticonfrompackagename(bean.getpackagename()));
      holder.apkname.settext(bean.getapkname());
      if (bean.getkind()!=0) {
        holder.result.settext("已经分类");
      }else{
        holder.result.settext("未分类");
      }
    }
    return view;
  }
  class viewholder{
    public imageview apkimage;
    public textview apkname;
    public textview result;
  }
  private drawable geticonfrompackagename(string name){
    drawable image = null ;
    try {
      appinfo = pmanager.getapplicationinfo(name, packagemanager.get_meta_data);
      image = pmanager.getapplicationicon(appinfo);
    } catch (namenotfoundexception e) {
      log.i("no packagename","no packagename");
    }
    return image;
  }
}

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希望本文所述对大家android程序设计有所帮助。