Validate inputs in android

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Validate inputs in android

The goal is to create one custom View class, that shows the correct UI depending on whether the View is in a custom defined error state. That UI can be set through drawables, and hence makes the view easily reusable and configurable in different AppThemes.

Suppose a form for signing up for an account with the following requirements:. StateListDrawables are XML files that contain a number of graphic images for different states of the drawable. The StateListDrawable would for example be:. Simple, right? The same logic can obviously be used for EditTextlike in our form. We do this by adding our own stylable to attrs.

Android Form Validation Tutorial using AwesomeValidation Library

Next up, we want to incorporate this state-logic into a View class, so that we can set the state of a View and show the right respective drawable is shown. When it loses focus, we validate the text filled in by the user. Our rather simple email validator looks like this:. Note here the textColor and background attributes. These are the drawables are responsible for changing the styling of the EditTextbased on whether it is in error state or not. The View class used for password input and validation is generally the same as for the email.

We want to make the password input visible and invisible, through a toggle. Android provides this through their support library, yay! There are several excellent Medium posts out there that take you through the workings of these components like this oneso I will skip that part. I just want to show you how you can easily apply the previously described logic to these components as well.

Our simple password validator:.

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Sign in. Archive About Submit your article. Building simple and effective login forms on Android. Sammy Odenhoven Follow. The final result:. AndroidPub Follow. Write the first response. More From Medium. More from AndroidPub.

validate inputs in android

Alistair Sykes in AndroidPub. Wajahat Karim in AndroidPub. Discover Medium. Make Medium yours.Every text field expects a certain type of text input, such as an email address, phone number, or just plain text. So it's important that you specify the input type for each text field in your app so the system displays the appropriate soft input method such as an on-screen keyboard.

Beyond the type of buttons available with an input method, you should specify behaviors such as whether the input method provides spelling suggestions, capitalizes new sentences, and replaces the carriage return button with an action button such as a Done or Next.

This lesson shows how to specify these characteristics. Figure 1. The phone input type. For example, if you'd like an input method for entering a phone number, use the "phone" value:. Figure 2. The textPassword input type. Or if the text field is for a password, use the "textPassword" value so the text field conceals the user's input:. There are several possible values documented with the android:inputType attribute and some of the values can be combined to specify the input method appearance and additional behaviors.

Figure 3. Adding textAutoCorrect provides auto-correction for misspellings. The android:inputType attribute allows you to specify various behaviors for the input method.

Most importantly, if your text field is intended for basic text input such as for a text messageyou should enable auto spelling correction with the "textAutoCorrect" value. You can combine different behaviors and input method styles with the android:inputType attribute. For example, here's how to create a text field that capitalizes the first word of a sentence and also auto-corrects misspellings:. Most soft input methods provide a user action button in the bottom corner that's appropriate for the current text field.

However, you can specify additional actions that might be more appropriate for your text field, such as Send or Go. To specify the keyboard action button, use the android:imeOptions attribute with an action value such as "actionSend" or "actionSearch".

Android Validation with EditText

For example:. Figure 4. You can then listen for presses on the action button by defining a TextView. If you want to provide suggestions to users as they type, you can use a subclass of EditText called AutoCompleteTextView. To implement auto-complete, you must specify an Adapter that provides the text suggestions.

There are several kinds of adapters available, depending on where the data is coming from, such as from a database or an array. Figure 5. Example of AutoCompleteTextView with text suggestions. The following procedure describes how to set up an AutoCompleteTextView that provides suggestions from an array, using ArrayAdapter :.

Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app. App resources. Resource types.In this data-driven era of technology, almost all websites and apps have one thing in common.

This task of validating input and text before calling web services and APIs have become a routine for developers.

In Android, this sometimes become too complex and tedious to perform validations and checks on multiple EditText and TextInputLayout views. These kinds of tasks often becomes boring for android developers and can cause major security vulnerabilities if not managed properly.

I was also frustrated in this situation and after searching through Internet and GitHub and using various third-party libraries, I have come up with this easy validation library surprisingly called as EasyValidation. In future, more views will be added in this list. First, you have to include it in your android projects using Gradle like this:. Now for example, you can validate any email string like this:.

You can check all these in Rules page. You can also apply multiple checks to make complex input very easily. Then you can do these types of checks like this:. You can see how easy is to perform multiple validation checks. One thing to note here is the check method. When you perform multiple validations, you will have to manually call check method in order to start validations.

In single validation, this method is called automatically. You can not only perform multiple validations on same text, but you can also perform same validation on multiple text streams at same time by using Collection Extensions. For example, you are taking a guest invite list of email addresses, and you have to see that all the texts are valid email addresses. Then you can do it like this:.

validate inputs in android

First step is you have to create your Rule class by extending BaseRule or any other existing rule like this. You can use this rule using Validator. And for the usage and documentation for how to use it, you can check it at GitBook at below link. In his spare time, he likes to spend time with his family, do experiments on coding, loves to write about lots of things mostly on blog and medium and is passionate contributor to open source.

In Juneone of his library became 1 on Github Trending. His libraries have about stars on Github and are being used in various apps by the developers all around the globe. Sign in. Archive About Submit your article. A text and input validation library for Android utilizing powerful features of Kotlin. Wajahat Karim Follow. How it works?

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It supports text validation for, …. Android Developer. AndroidPub Follow.A lot of people perform Android input validation when a button is pressed and display the validation message in a dialog as shown below. To get these free validation controls you simply need to perform validation on the EditText at any time during the runtime execution of your app.

This could be after a button is pressed, via a Text Changed Listener or via any other method. Once you determine that your input is invalid simply call the setError method on the EditText instance as shown below.

As soon as the user starts typing in the EditTextthe validation icon and message will disappear.

validate inputs in android

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validate inputs in android

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Registration Form Validation in Android

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Liked the given ideas of yours a lot. I wrote a class that extends EditText which supports natively some validation methods and is actually very flexible.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am new to android mobile development Android Studio native development - for new knowledge.

And here I want to ask a question regarding best practice for input validation. As far we know, when a developer develop input form. We need to prevent a user from key in a wrong input into the text field.

So here is my question. From my point of view personally, it should have a way to implement the technique. So that we didn't need to reuse same code all over again for each java file in term of clean code. Unfortunately, I didn't find any example or tutorial for that. Maybe I search a wrong keyword or misread. And if there is no such technique exist, what are the best practice for input validation?

This java class implements a TextWatcher to "watch" your edit text, watching any changes done to the text:. Learn more. Asked 4 years, 6 months ago. Active 2 years, 4 months ago.

Viewed 26k times. So here is my question, Can we create one java file for validation purpose only? All input form ,must go to that one validation file only In case of many input page screen in one apps. If NOwhy? Thank you. Salehin Rafi Salehin Rafi 2 2 gold badges 7 7 silver badges 16 16 bronze badges. Actually there are some libs already github. Active Oldest Votes.

ZooMagic 6 6 silver badges 11 11 bronze badges. Randyka Yudhistira Randyka Yudhistira 3, 1 1 gold badge 23 23 silver badges 38 38 bronze badges.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I need to do form input validation on a series of EditTexts. I'm using OnFocusChangeListeners to trigger the validation after the user types into each one, but this doesn't behave as desired for the last EditText. If I click on the "Done" button while typing into the final EditText then the InputMethod is disconnected, but technically focus is never lost on the EditText and so validation never occurs.

Should I be monitoring when the InputMethod unbinds from each EditText rather than when focus changes? If so, how? Since you have a number of EditText boxes to be validated, I think the following shall suit you :. The Editable s doesn't really help to find which EditText box's text is being changed. But you could directly check the contents of the EditText boxes like.

If you want nice validation popups and images when an error occurs you can use the setError method of the EditText class as I describe here. In order to reduce the verbosity of the validation logic I have authored a library for Android. It takes care of most of the day to day validations using Annotations and built-in rules. You can add these annotations to your UI widget references and perform validations.

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It also allows you to perform validations asynchronously which is ideal for situations such as checking for unique username from a remote server. There is a example on the project home page on how to use annotations.

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You can also read the associated blog post where I have written sample codes on how to write custom rules for validations. The library is extendable, you can write your own rules by extending the Rule class.

This was nice solution from here. Google has recently launched design support library and there is one component called TextInputLayout and it supports showing an error via setErrorEnabled boolean and setError CharSequence.Registration form validation android — Here, I share with you how to validate the registration form in android. Actually this is the simple way to validate the form in android.

So you have easily make an registration form validation android. Now a days most peoples are like to use mobile application so everyone some awareness to develop mobile application like form validation, email alert and much more.

But you have some knowledge in Java to develop the mobile application. In previous tutorial i have explain how to convert website to android application.

So you have website? Okay lets start our tutorial, First you have create new project and the project name is Form Validation. Then click Next, Like below image. Now, we have validate entire form which fields for we used in our project. First, you have to create some fields in the form to validate the registration form. I have create 4 fields in the form.

Then move on the main page of MainActivity. Hereafter copy the below code and paste your MainActivity. Here, we have define validation error message in strings. Open strings. We need validation library to validate to registration form.

Sp here we have add the library file in build. Add the below code. Now, you have execute your android application in android emulator. Finally the application looks like. This is J. Blogging is my Passion, I love to write article about Programming. Registration Form Validation in Android. AppCompatActivity; import android.

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Bundle; import android. Patterns; import android. View; import android. Button; import android. EditText; import android.


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