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; } }
更多关于Android相关内容感兴趣的读者可查看本站专题：《Android数据库操作技巧总结》、《Android编程之activity操作技巧总结》、《Android文件操作技巧汇总》、《Android编程开发之SD卡操作方法汇总》、《Android开发入门与进阶教程》、《Android资源操作技巧汇总》、《Android视图View技巧总结》及《Android控件用法总结》
希望本文所述对大家Android程序设计有所帮助。