android 프로그램에서 패키지 이름을 통해 핸드폰에 앱이 설치되어 있는지 판단합니다

			Intent intent = new Intent();
			intent.setPackage(toAppPackageName);
			intent.putExtra(Constants.KEY_UID_FROM_APP_NAME, curAppPackageName);
			intent.putExtra(Constants.KEY_UID_OP_CODE, Constants.VALUE_UID_OP_CODE_SCAN);
			intent.setAction("android.intent.action.iqiyi.sso");
			// intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			Context context = getApplicationContext();
			if (IntentTools.isIntentActionAvailable(context, intent)) {
				startActivityForResult(intent, REQUEST_CODE_FOR_SCAN_ACCOUNT);
			} else {
				//    APP，  
				finishOneScan();
			}

isIntentActionAvailable(context, intent) ？？

	public static boolean isIntentActionAvailable(Context context, Intent intent) {
		PackageManager packageManager = context.getPackageManager();
		List list = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
		return list != null && list.size() > 0;
	}