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- Lesson 1.3: How to modify TextView in Java code (findViewById, setText and getText methods)
- Step 1. Adding ID to TextView
- Step 2. Finding TextView using ID (and importing a TextView class).
- Step 4. Getting a text via getText() and extending it
- Step 5. Expanding text in TextView by append() method
- Step 6. Preview only in emulator
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Lesson 1.3: How to modify TextView in Java code (findViewById, setText and getText methods)
By Android Teacher on June 29th, 2013 in Getting started , Java , TextView tags: activity_main.xml , adding id , android.widget.TextView , android:id , append , findViewById , getResources , getString , getText , id , import , looking for id , onCreate , setText , string , strings.xml , TextView , toString
We have already presented some text on the screen using layout XML file. 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 ). We’re going to use concepts like classes, methods and variables explained there.
In the lesson 1.1 we were using TextView tag. 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.
There are three scenarios:
- Modifying a text added in layout XML file.
- Adding a TextView directly in Java instead of layout XML file.
- Adding additional TextView elements beside that from layout XML file.
Now we focus only on scenario 1, leaving 2 & 3 for future lessons.
We finished previous lesson displaying I’m the best from strings.xml file. But imagine that we would like to change this text to I love you . Of course to make such an amazing Valentine’s app we could just modify a content of strings.xml file, but let’s assume that firstly we want to show I’m the best and later change it to a new string.
To achieve this goal we have to accomplish two tasks: find TextView in layout file and then change a text it displays.
Step 1. Adding ID to TextView
The easiest way to find element of the Android app layout is to use its ID. We could add our own IDs to almost every XML tags. To add ID we use android:id attribute.
This is an example:XHTML
Open activity_main.xml file and add android:id attribute to TextView using above example.
Step 2. Finding TextView using ID (and importing a TextView class).
We could close activity_main.xml file and switch to MainActivity.java file. We would add some commands to onCreate method ( you could learn more about onCreate from this lesson ), so they would be executed just after starting an app.
To find TextView we will use findViewById() method (it allows to find any type of View, but now we know only TextView…). First we have to create a variable based on TextView class. We name it textElement, but of course you could choose your name.Java TextView textElement;
Put this line after: setContentView(R.layout.activity_main). This line displays on device screen layout resource – in this case activity_main.xml file.
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.java file:Java import android.widget.TextView;
Import is used to add predefined Android or Java classes from other packages , but we don’t have to bother about it as Android Studio adds import lines automatically as we start to use some classes.
Let’s go back to TextView. Now we have to assign TextView from layout file to TextView variable.Java newtext = (TextView) findViewById(R.id.this_is_id_name);
|1||newtext = (TextView) findViewById(R.id.this_is_id_name);|
We have to set in brackets a type of View we’re looking for and then give type and name of resources: ( view_type ) findViewById(R.id. id_name ).
Instead of using two lines for TextView declaration and assigning TextView tag, we could combine them.
This is a full code of onCreate:
Step 3. Replacing a text via setText()
As we have now access to TextView all we have to do it is just use setText() method with a new text as argument .Java textElement.setText("I love you");
|1||textElement.setText("I love you");|
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.
First add a new definition to strings.xml file:XHTML
And now refer to it:Java textElement.setText(R.string.my_love_text);
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.xml file.
We’ve found TextView in layout XML file and set a new text to it (Android Studio)
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 newText), then assign some text to it and finally set this text to TextView.Java String newText; newText = "I love you"; textElement.setText(newText);
|123||String newText;newText = "I love you";textElement.setText(newText);|
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 .Java newText = getResources().getString(R.string.my_love_text);
|1||newText = getResources().getString(R.string.my_love_text);|
We’ve used setText with String variable. Tricky part was referring to String resources via getString (Android Studio)
Step 4. Getting a text via getText() and extending it
In the previous step we replaced one text with another. There is also possibility to read original text and modify it.
First we have to create a variable that would store original text from layout file. Because it’s for text the type should be String. Let’s call it modifyText.Java String modifyText;
Now we have to assign original text to it. To read the text we use getText() method on the specific TextView instance. Because getText() returns so called CharSequence and we need String, we additionally use toString() that coverts it .Java modifyText = textElement.getText().toString();
|1||modifyText = textElement.getText().toString();|
Now we could modify the value of variable. We do the simplest modification – just add extra text. Later we will practice much more sophisticated String operations.Java modifyText = modifyText + " I love you";
|1||modifyText = modifyText + " I love you";|
And as previously we set this text to TextView.Java textElement.setText(modifyText);
This time we extended text we had previously get from TextView (Android Studio)
Step 5. Expanding text in TextView by append() method
The same what we did in previous step we could do just by one method. If we want to add something to a text displayed by TextView, we don’t need to get text first, modify it and set that text again. Just use append() instead. Of course we still need to refer to TextView element found via findViewById().
This is a code:Java textElement.append("More Text");
Instead of a specific string you could use a String variable or string resource as in the previous step. Mind that additional text would be glued exactly at the end of a current one, so usually it’s necessary to add a space at tge beggining, like ” More text”.
Step 6. Preview only in emulator
If we now switch again to main_activty.xml layot file and open a preview window (use Preview tab on the right edge of screen), we will still see I’m the best text . Preview works only for layout in XML files. Java code isn’t executed until you run an app. So too see an effect you have to start an emulator (read more ) or test an app on real devices (read more) .
Summary: We could easily modify a text added in layout file. First we have to find right TextView tag using its ID and then use method setText() to modify a text. Method setText() as an argument could use specific text, string resource or String variable. We’ve also managed to use getText() to read a text assigned to specific TextView.Previous: Lesson 0.12: Java basics – more about methods & variables (access modifiers public or private, getters and setters) Next: Lesson 1.4: How to change a color of text and background in TextView?
What & WhyThere are many Android tutorials for developers, but it is difficult to find easy to understand lessons for beginners. Android4Beginners.com explain how to build your apps step by step with clear instructions, examples and illustrations. Feel free to share your tips & tricks too! Search for:
- Lesson 0: How to create the first Android app (getting started)
- Lesson 1: How to display and format a text in Android apps
- Lesson 2: How to arrange layout of Android app? Examples of all layout types
- Appendix A: Android XML syntax – structure of XML tags and attributes
- Appendix B: Everything about colors in Android
- Appendix C: Everything about sizes and dimensions in Android
- Appendix D: Comments in XML and Java – it’s crucial to create a documentation of Android app
- Android Studio
- Getting started
- Lesson 2.3: How to put layout into layout to create advanced app interface (layout tree in Android)?
- Lesson 2.2: How to use margins and paddings in Android layout?
- Appendix D: Comments in XML and Java – it’s crucial to create a documentation of Android app
- Lesson 2.1: How to build Android app with simple, but powerful LinearLayout? Plus layout orientation as well as size and weight of elements
- Lesson 2: How to arrange layout of Android app? Examples of all layout types
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