Setting a textView equal to a value in an Array Java

Question

I have written some simple code to generate a random value in my array. It generates that random value, but I cannot set my textView equal to that value. This is a very simple problem, but I can't seem to find the solution anywhere.

Here is my code...

final String[] group_topics = {"Walking", "Swimming", "Running"};

public void getRandomTopic1() {
    Random random = new Random();

    int index = random.nextInt(group_topics.length);

    topicOne.setText(group_topics[index]);



    topicOne = (TextView) findViewById(R.id.textView2);
}

does it crash?? why are you setting text before referencing it? — Elltz, Feb 17 '16 at 01:40

score 3 · Accepted Answer · answered Feb 17 '16 at 01:40

3

topicOne = (TextView) findViewById(R.id.textView2);
 topicOne.setText(group_topics[index]);

At First You will have to wire the widget and then acess it . you doing it the other way which will not work. try this and it will work.

answered Feb 17 '16 at 01:40

Sumanth Jois

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Omg I can't believe I didn't think of that thank you. – 0xOsiris Feb 17 '16 at 01:42

Inducesmile · Answer 2 · 2016-02-17T01:53:28.573

0

You did not instantiate your TextView before setting a value to it. I have changed the code slightly.

final String[] group_topics = {"Walking", "Swimming", "Running"};

public void getRandomTopic1() {
    Random random = new Random();

    int index = random.nextInt(group_topics.length);

    topicOne = (TextView) findViewById(R.id.textView2);

    topicOne.setText(group_topics[index]);

}

edited Feb 17 '16 at 01:53

answered Feb 17 '16 at 01:44

Inducesmile

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Setting a textView equal to a value in an Array Java

2 Answers2