Android检查某个应用是否存在

/**
	 * 检查前台程序是否存在
	 * 
	 * @param packageName
	 * @return
	 */
	private boolean checkAppExist(String packageName) {
		if (packageName == null || "".equals(packageName))
			return false;
		try {
			ApplicationInfo info = getPackageManager().getApplicationInfo(
					packageName, PackageManager.GET_UNINSTALLED_PACKAGES);

			return true;
		} catch (NameNotFoundException e) {
			
			return false;
		}
	}