CODEWITHSUNDEEP
android
indira
indira

Reputation: 6687

How to update a value in the TextView from a handler?

I have a TextView in the xml and from the OnCreate method I call its SetContentView. I have also written a handler to get message from other classes. Upon receiving the messages, the handler has to update the TextView with the message. But the TextView is null inside the handler. What to do/?. Please help

Upvotes: 2

Views: 513

Answers (1)

Ken Fehling
Ken Fehling

Reputation: 2111

How are you getting a reference to the TextView? Something like this?

final TextView myTextView = (TextView) findViewById(R.id.my_text_view);

Then depending on what you need, you can do one of many things, including:

  1. Pass this to your handler class

  2. Create a "listener" interface that has an onUpdate(String msg) method and store an instance of this in the handler, then implement

    public void onUpdate(String msg) {

    myTextView.setText(msg);

    }

in your Activity class and call listener.onUpdate(msg) from your handler class.

I'd probably prefer doing something like #2 because it keeps the UI-specific code out of the handler which would make that class easier to test.

Upvotes: 1

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