Android Eclipse: Change The Text In The App To A String Created Withing The Program

http://www.devx.com/wireless/Article/39101/0/page/2 I have followed this tutorial and got it to work and everything. now i am working on my own stuff after getting the basics down.

Solution 1:

How can i get a string that i create in the .java file to show up on the app UI?

I'm assuming you want to display it in a TextView. If so, you can do the following:

String str = "Hello there!";
private TextView text = (TextView) findViewById(R.id.textViewId);
text.setText(str);

Solution 2:

How can i get a string that i create in the .java file to show up on the app UI?

In Android, anything that visualises somthing to the user is called a View. There are lots of different types, suitable for visualising different types of data. For basic text you will need a TextView. So simplify things, let's just assume that you have the XML code as presented in your link:

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"
    ><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/hello"
    /></LinearLayout>

There are numerous resources that explain how to you build/use layouts, their pros, cons and what not, so I'm skipping that part. The important thing to realise is that there is a TextView defined in the layout presented above. In order to reference it, it will need to have a unique id. Let's add one:

<TextView  
    android:id="@+id/question_textview" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
/>

You can then reference this TextView from Java code as follows:

TextViewquestionTextView= (TextView) findViewById(R.id.question_textview);

Note that R.id.question_textview is basically what we named the TextView in the layout earlier. From here on, you have a Java object that you can do all sorts of things with, including getting and settings the text it is showing.

StringtextDisplayed= questionTextView.getText(); // This will get the text currently displaying.
questionTextView.setText("Please display me"); // This will set the displayed text to "Please display me".

I would really advise you to go through some more tutorials and api demos, as this is really basic stuff.