We have already presented some text on the screen using layout XML file.
Android TextView Using Kotlin
This is recommended approach, but if we want to modify that text we have to use Java. If you are new to Java read a few lessons called Java basics that we have already published they are a part of Lesson 0 set. In the lesson 1. TextView is also Android class for displaying text. So in Java code we would use it too, but instead of attributes we will modify it by methods.
But imagine that we would like to change this text to I love you. To achieve this goal we have to accomplish two tasks: find TextView in layout file and then change a text it displays. The easiest way to find element of the Android app layout is to use its ID. To add ID we use android:id attribute.
Using an integer in TextView.setText() crashes my app
The android:id syntax looks very similar to android:text what we were practicing in the previous lesson. We would add some commands to onCreate method you could learn more about onCreate from this lessonso they would be executed just after starting an app. First we have to create a variable based on TextView class.
We name it textElement, but of course you could choose your name. Put this line after: setContentView R. By the way maybe you have noticed that adding this code also resulted in a new line in import section at the top of MainActivity. Instead of using two lines for TextView declaration and assigning TextView tag, we could combine them. As we have now access to TextView all we have to do it is just use setText method with a new text as argument. Mind that this would completely replace an original text.
Of course instead of using the text directly into a code we rather should refer to string resources as explained in previous lesson. Below you find full code of onCreate method mind that there are two lines with setText doing the same, but in different way and strings. There is one more option. As an argument of setText we could also use a String variable so the variable storing a text. First define a variable for instance named newTextthen assign some text to it and finally set this text to TextView.
Instead of assigning a text we could again refer to string resources. For this we need two methods — getResources referring to resources pool and getString referring to string resources with string name as argument.Any android app has two parts in it — frontend and backend. Frontend refers to the visualization of the components i. Backend part refers to the logic behind the functioning of your app.
Whenever we click on any button or submit any form, the backend code decides what action to perform next or what to do with the data received from user etc. In our previous tutorials, we have seen how different types of layout are useful for for GUI designing which is the frontend part. Here in this tutorial, we are going to focus and code for the backend part.
In our example, we will take input from the user through EditText view and will display it in the TextView. Additionally, we will also get to see a buttonClickListener that is used to define the action to be performed when a button is clicked in the app. After setting the main layout using the setContentView method in the onCreate method, attach the global variables that we defined to the GUI views using findViewById method as shown below.
In other words, this method is used to get the view instance in Java, that you have made and used in layout XML. This is done by mentioning the id of the view that you have defined in XML. The view created in XML is used in Java to manipulate it dynamically. Note: findViewById method returns only Viewbut it does not tell which view is returned i. Therefore, you need to typecast the view returned by this method. Now, to enable button click event, we need to attach a click listener to our button instance.
It is done by writing the following code:. Once you add this code, whenever th submit button is clicked, the method onClick will be called and the code inside it will be executed. According to your requirements, we want to get the text that user will enter in the EditText and show it in the TextView whenever the submit button is clicked.
Therefore, let's place the following code inside onClick method:. We have used getText method to get the text entered in the EditText views. But getText method returns an Editable instance and therefore we have typecasted it to convert it into String for further use.
This can be done by using the toString method.Are you ready for the Galaxy S20? Here is everything we know so far! JiMMaR likes this. Thanks jonbonazza. You got me on the right path. I ended up using double instead of integers for my "real" project, but it works just the same using Double.
That said, it is still good to know other ways to do the same thing so if I see code that uses it I won't be totally stumped. Similar Threads - Using integer TextView.
My s20 want charge using power bank chrisllpyd50Apr 17, at PMin forum: Android Devices. Replies: 1 Views: 0.
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When the app starts, the text shown is stored in strings. I would like to set this to the string under the name "help00" programmatically, by placing another "0" at the and of the name. So far I have written this code :. You have to get first resource string from android resource and then need to concat with local String variable, like. As I doubt, if you are looking for dynamically String id, You want String resource id with already exist id and '0' append to it then get int resource id from String using.
I believe that strings. Learn more. How do I set text of TextView to a string resource? Java for android Ask Question. Asked 5 years, 2 months ago. Active 2 years ago. Viewed 25k times. How could I fix this problem? Marcus 6, 10 10 gold badges 38 38 silver badges 78 78 bronze badges. Do you want the "0" at the end of the text or you want to get a string resource id of "help0"?
Yes it's declared. When the app starts, the value of help0 from strings. Active Oldest Votes. You have to get first resource string from android resource and then need to concat with local String variable, like, help. Is there a way I could do this? Something similar stackoverflow. Marcus Marcus 6, 10 10 gold badges 38 38 silver badges 78 78 bronze badges. My problem is, that I am changing the 'stringId', so after I change it what way could I change it to something else?
Waddah Mustafa Waddah Mustafa 11 1 1 bronze badge. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Featured on Meta. Community and Moderator guidelines for escalating issues via new response….You've seen how to use an Android Intent to create a new Activity.
But they can also be used to send data to an activity. Let's see how. Go back to your MainActivity. Under the line that sets up your intent, add the following:. When you create an Intent object, you have lots of methods available to you.
One of these methods is called putExtra. In between the round brackets of putExtra, you first need the name of a key. This has to be a String. After a comma, you then type the text you want to use as the value for the key. Again, you can have a variable here, if you want.
Inside of that key we've stored the value "First activity says Hello! When we come to retrieve the value, we only need to use the key. Go back to your SecondActivity.
We'll retrieve the value for our key here. Just below the setContentView line, add this:. If any of your text turns red then it means you haven't imported the correct library. Click on any red text so that the cursor is positioned there.
Now hold down the ALT key on your keyboard. Keep it held down and press the enter key on your keyboard. The red text should go away. If that doesn't work, simply add this line to the top of your code:. The method we need now is called getStringExtra. In between the round brackets of getStringExtra you need the name of a key you set up.
We're then storing this value into the String variable we've called message. Now that we have retrieved the value for the key, we can place it into the Text View on our second Activity. You could should look like this, though:. If you want to do something with a control View on your Activity, then you need to get a reference to it. We need to get a reference to the Text View. You start with the class name of your control.
For a TextView this is just TextViewall as one word. You then need to come up with a variable name:. When you dragged a Text View widget onto your Activity, it was given a default name of textView. Select your control and have a look at the properties area on the right:. Right at the top of the properties area, you can see the ID. You could, if you wanted to, change the ID from textView to something else. But we'll leave it as it is.
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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 have an object on my main. I also have a string called sharefact. I want to save what text is in the TextView into the sharefact string. I can't do:. Getting text from a TextView returns CharSequence. To convert CharSequence to StringtoString function is used.
Learn more. Asked 9 years, 6 months ago. Active 4 years, 4 months ago. Viewed 64k times. Keenan Thompson Keenan Thompson 3 3 gold badges 10 10 silver badges 29 29 bronze badges.
Active Oldest Votes. Damian Kozlak 6, 10 10 gold badges 37 37 silver badges 49 49 bronze badges. Tyler Treat Tyler Treat You answered my last question too! Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
Post as a guest Name. Email Required, but never shown. The Overflow Blog.Why report me as Abuse sir TeHa. NeuraS not to be rude, but please read a book about C and. All principles from it will more or less reusable when working on Xamarin. Android and Xamarin. This is necessary when updating UI elements from another thread than the UI thread. Most of us on this forum are willing to lend a helping hand, but in return we expect some effort on your part too.
What is Xamarin. April edited April in Xamarin. Im having problem on how to display string on textview and Edittext. Best Answers. April Accepted Answer. SetText string text. April Why report me as Abuse sir TeHa sorry for my noob question.
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