有一个需求获取本地指定的系统App和已经下载的App列表：

实现非常简单，首先获取本机已安装的App，然后把我们指定的系统App过滤掉，存入一个List集合中，然后把其他的系统App过滤掉，剩下的在放入，另外一个List集合中，组合就Ok。

贴下主要代码：

/** * Created by Xiho on 12:10 * MyBlog: xuhao.tech * GitHub: github.com/git-xuhao * Function: */public class AppUtils {    public static final String PACKAGE_OTA="com.sunmi.ota";    public static final String PACKAGE_MARKET="woyou.market";    public static final String PACKAGE_HARD_WARE_KEEPER="com.woyou.hardwarekeeper";    public static final String PACKAGE_UDH="com.woyou.udh";    public static final String PACKAGE_SETTING="com.android.settings";    /**     * 过滤自定义的App和已下载的App     * @param packageManager     * @return     */    public static List
    
      scanInstallApp(PackageManager packageManager,int filterType) {        List
     
       myAppInfos = new ArrayList
      
       ();        List
       
         mFilterApps = new ArrayList
        
         ();        try {            List
         
           packageInfos = packageManager.getInstalledPackages(0); for (int i = 0; i < packageInfos.size(); i++) { PackageInfo packageInfo = packageInfos.get(i); //过滤指定的app String tempPackageName=packageInfo.packageName; if(tempPackageName.equals(PACKAGE_OTA)||tempPackageName.equals(PACKAGE_MARKET)||tempPackageName.equals(PACKAGE_HARD_WARE_KEEPER) ||tempPackageName.equals(PACKAGE_UDH)||tempPackageName.equals(PACKAGE_SETTING)){ AppInfo appInfo = new AppInfo(); appInfo.setAppName((String) packageInfo.applicationInfo.loadLabel(packageManager)); if (packageInfo.applicationInfo.loadIcon(packageManager) == null) { continue; } appInfo.setAppIcon(packageInfo.applicationInfo.loadIcon(packageManager)); mFilterApps.add(appInfo); continue; } //过滤掉系统app if ((ApplicationInfo.FLAG_SYSTEM & packageInfo.applicationInfo.flags) != 0) { continue; } AppInfo appInfo = new AppInfo(); appInfo.setAppName((String) packageInfo.applicationInfo.loadLabel(packageManager)); if (packageInfo.applicationInfo.loadIcon(packageManager) == null) { continue; } appInfo.setAppIcon(packageInfo.applicationInfo.loadIcon(packageManager)); myAppInfos.add(appInfo); } myAppInfos.addAll(mFilterApps); } catch (Exception e) { e.printStackTrace(); } return myAppInfos; }