CODEWITHSUNDEEP
javaandroidcompiler-errorstextview
meesg
meesg

Reputation: 23

Getting a error when changing a Android TextView visibility

I have this code, does anybody know why I get an error when I compile this on my Phone?

public void onSectionAttached(int number) {
            TextView textView = (TextView) findViewById(R.id.textView1);
            textView.setVisibility(View.VISIBLE);
            switch (number) {
                case 1:
                    mTitle = getString(R.string.title_section1);
                    break;
                case 2:
                    mTitle = getString(R.string.title_section2);
                    textView.setVisibility(View.GONE);
                    break;
                case 3:
                    mTitle = getString(R.string.title_section3);
                    textView.setVisibility(View.GONE);
                    break;
            }
    }

EDIT : This is the error I get, it goes wrong on the setVisibitily lines.

Upvotes: 1

Views: 160

Answers (1)

Gilad Haimov
Gilad Haimov

Reputation: 5867

Next time please attach the relevant logs to your question. It makes things so much simpler..

Anyway the only causes for error I can see in your code are:

A. textView.setVisibility() is called from a thread other than the UI thread. If that is the case, do something like to solve your problem:

 myActivity.runOnUiThread(new Runnable() {
        public void run() {
            onSectionAttached(num);
        }
  });

B. You have not called setContentView() to your layout prior to activating this code.

C. Your layout does not contain a TextView element called textView1. In which case findViewById() wil return null and textView.setVisibility() will result in NPE.

Upvotes: 2

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