android中得到本应用程序的相关包信息和手机中安装的应用程序的相关信息

1.android中得到本应用程序的相关包信息

private String getVersion() {
		// get the PackageManager
		PackageManager manager = this.getPackageManager();
		try {
			PackageInfo info = manager.getPackageInfo(getPackageName(), 0);
			return info.versionName;
		} catch (NameNotFoundException e) {
			e.printStackTrace();
			return this.getString(R.string.text_version);
		}
}

说明：在Activity中首先可以调用this.getPackageManager()方法得到PackageManager对象，通过manager对象可以通过调用getPackageInfo(packageName,0);方法,得到PackInfo对象，然后就可以取得应用程序的“版本.........”等相关信息。

2.手机中安装的应用程序的相关信息

private static final String TAG = "AppManagerProvider";
private Context context;
private PackageManager manager;


public AppManagerProvider(Context context) {
	this.context = context;
	manager = context.getPackageManager();
}



/**
 * return the list of the phone application
 * @return
 */
public List<AppManagerInfo> getAppManagerInfo(){
	List<AppManagerInfo> lists = new ArrayList<AppManagerInfo>();
	List<PackageInfo> infos = manager.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);
	
	for (PackageInfo packageInfo : infos) {
		AppManagerInfo myApp = new AppManagerInfo();
		String packName = packageInfo.packageName;
		myApp.setPackName(packName);
		ApplicationInfo applicationInfo = packageInfo.applicationInfo;
		Drawable icon = applicationInfo.loadIcon(manager);
		myApp.setIcon(icon);
		String appName = (String) applicationInfo.loadLabel(manager);
		myApp.setAppName(appName);
		if(filterApp(applicationInfo)){
			Log.i(TAG, "三方应用");
			myApp.setSystemApp(false);
		}else{
			Log.i(TAG, "系统应用");
			myApp.setSystemApp(true);
		}
		lists.add(myApp);
	}
	
	return lists;
	
}

public boolean filterApp(ApplicationInfo info){
	if((info.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0 ){
		return true;
	}else if((info.flags & ApplicationInfo.FLAG_SYSTEM) == 0){
		return true;
	}
	return false;
}