android 检测该包名所对应的运用是否存在

/**  	 * 检测该包名所对应的应用是否存在  	 * @param packageName  	 * @return  	 */  	public boolean checkPackage(String packageName)   	{  	    if (packageName == null || "".equals(packageName))  	        return false;  	    try 	    {  	        getPackageManager().getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES);  	        return true;  	    } 	    catch (NameNotFoundException e) 	    {  	        return false;  	    }  	}