android程序中 通过包名判断手机上是否已安装app

			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 {
				// 未安装APP，跳过
				finishOneScan();
			}			Intent intent = new Intent();
			intent.setP