How to modify Android app UI via java when I created it using main.xml file?

Question

This is my first post here. Have done hundreds of posts, mostly answers, in linuxquestions.org, but nothing here yet. I'm starting to develop using android SDK 1.2, and struggle to understand something.

I've used a basic source that uses xml to define a UI and gets it displayed using setContentView(R.layout.main);.

Now in my Java program I'd like to add some code to modify some of the objects I defined in my xml file.

I understand Java, the object concept, methods, etc ... but I don't know which exact syntax to use, and which id my object actually is.

My xml code includes:

<EditText android:layout_width="match_parent" android:id="@+id/editText1" android:layout_height="wrap_content" android:text="@string/saisie">
    <requestFocus></requestFocus>
</EditText>

my .java includes:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);
}

My question is: how do I modify the .java code to make the EditText object display "hello" instead of what is statically defined in my strings file?

I know there is not a big practical use in the example code I am doing, but it will help me do lots of other more interesting things.

Yar · Accepted Answer · 2011-10-29 11:34:36Z

3

In your onCreate() or another function, add:

 EditText et = (EditText)findViewById(R.id.editText1);
 et.setText("some text");

answered Oct 29, 2011 at 11:34

Yar

4,5712 gold badges37 silver badges43 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Georges Dev Over a year ago

thanks. I added what you mention after setContentView(R.layout.main); it works now.

Sunny · Accepted Answer · 2011-10-29 11:56:10Z

0

Change to this (delete the android:text=@string/..)

<EditText 
 android:layout_width="match_parent" 
 android:id="@+id/editText1" 
 android:layout_height="wrap_content" 
 <requestFocus></requestFocus>
</EditText>

And add the following in onCreate()

 EditText text = (EditText)findViewById(R.id.editText1);
 text.setText("some text");

answered Oct 29, 2011 at 11:56

Sunny

14.9k17 gold badges89 silver badges132 bronze badges

Collectives™ on Stack Overflow

How to modify Android app UI via java when I created it using main.xml file?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related