java实现获取安卓设备里已安装的软件包

private String getInstalledAppListAsString(){    PackageManager pm = context.getPackageManager();    List<ApplicationInfo> apps = pm.getInstalledApplications(PackageManager.GET_GIDS);    StringBuffer stringBuffer = new StringBuffer();    for (ApplicationInfo app : apps) {      if(pm.getLaunchIntentForPackage(app.packageName) != null) {        // apps with launcher intent        if((app.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) == 1) {          // updated system apps         } else if ((app.flags & ApplicationInfo.FLAG_SYSTEM) == 1) {          // system apps         } else {          // user installed apps          stringBuffer.append(app.packageName).append(';');        }      }    }    return stringBuffer.toString();  }

package cn.lyz.mobilesafe.domain;import android.graphics.drawable.Drawable;/** * 获取的应用基本信息实体类 * @author liuyazhuang * */public class AppInfo {	//图标	private Drawable app_icon;	//应用名称	private String app_name;	//应用版本号	private String app_version;	//应用包名	private String packagename;	//是否是用户app	private boolean isUserApp;			public AppInfo() {		super();		// TODO Auto-generated constructor stub	}	public AppInfo(Drawable app_icon, String app_name, String app_version,			String packagename) {		super();		this.app_icon = app_icon;		this.app_name = app_name;		this.app_version = app_version;		this.packagename = packagename;	}			public AppInfo(Drawable app_icon, String app_name, String app_version,			String packagename, boolean isUserApp) {		super();		this.app_icon = app_icon;		this.app_name = app_name;		this.app_version = app_version;		this.packagename = packagename;		this.isUserApp = isUserApp;	}	public Drawable getApp_icon() {		return app_icon;	}	public void setApp_icon(Drawable app_icon) {		this.app_icon = app_icon;	}	public String getApp_name() {		return app_name;	}	public void setApp_name(String app_name) {		this.app_name = app_name;	}	public String getApp_version() {		return app_version;	}	public void setApp_version(String app_version) {		this.app_version = app_version;	}	public String getPackagename() {		return packagename;	}	public void setPackagename(String packagename) {		this.packagename = packagename;	}		public boolean isUserApp() {		return isUserApp;	}	public void setUserApp(boolean isUserApp) {		this.isUserApp = isUserApp;	}		@Override	public String toString() {		return "AppInfo [app_icon=" + app_icon + ", app_name=" + app_name				+ ", app_version=" + app_version + ", packagename="				+ packagename + ", isUserApp=" + isUserApp + "]";	}}