Android : TextView setText only works at the first time

Question

Every time enter the main activity, The code below will be executed and works fine(that means indexStatus.setText(msg.obj.toString()); alway shows the latest msg).

But if I press back button to switch out, and then switch in the same screen(The reBuildIndex will run again), the Log.d(TAG, msg.obj.toString()); works fine, print out latest msg, but indexStatus.setText doesn't work, the latest msg does not display as I expected.

What's going on here ? Any suggestion ?

void rebuildIndex(boolean reCreate) {
    final TextView indexStatus = (TextView) this.findViewById(R.id.index_status);
    indexStatus.setVisibility(View.INVISIBLE);
    indexStatus.setText(R.string.rebuild_index_progress_title);

    final Handler statusHandler = new Handler(Looper.getMainLooper(), new Handler.Callback() {
      @Override
      public boolean handleMessage(Message msg) {
        if (msg.obj == null) {
          indexStatus.setVisibility(View.GONE);
        } else if (msg.obj.equals("show")) { // TODO quick demo, shouldn't use literal text.
          indexStatus.setVisibility(View.VISIBLE);
        } else {
          Log.d(TAG, msg.obj.toString());
          if (indexStatus.getVisibility() != View.VISIBLE) {
            indexStatus.setVisibility(View.VISIBLE);
          }
          indexStatus.setText(msg.obj.toString());
          indexStatus.invalidate();
        }
        return false;
      }
    });

    Indexer.rebuildIndexIfNecessary(statusHandler, reCreate);
  }

UPDATE:

I've added a indexStatus.invalidate(); after setText in the third condition, doesn't work either.

UPDATE: Wrong msg at original post, I said press home, but actually its back to switch out. home button switch out/in works fine.

UPDATE: Tried to place the handler as a global variable, but didn't work. Now I disabled back event.

This is interesting. May I know what do you see (the message) when its not functioning as expected? — LightYearsBehind, Sep 30 '16 at 02:51
Can you give a little more info on where the `rebuildIndex()` is getting called again? Is it from `onResume()`? what actually triggers the method and what triggers the the `handleMessage()` of the `Handler`? — ᴛʜᴇᴘᴀᴛᴇʟ, Sep 30 '16 at 02:52
`rebuildIndex` is called from `onStart` of the activity, and the message is a normal literal `String` — WoooHaaaa, Sep 30 '16 at 03:36
@LightYearsBehind there's nothing display at all, seems the view is not visiable at all — WoooHaaaa, Sep 30 '16 at 03:37
Sounds to me like "else" case is not called, but you said `Log.d(...)` works.. I assume you didn't call `Log.d(...)` elsewhere? — LightYearsBehind, Sep 30 '16 at 03:43
@LightYearsBehind `Log.d` is definitely works correctly, I've tried to print `indexStatus.getVisibility()`, and it also works & correct. This wired thing almost drive me crazy — WoooHaaaa, Sep 30 '16 at 03:46
This puzzled me as well! Can you please post the entire `Activity` code if possible? — LightYearsBehind, Sep 30 '16 at 04:00
That still puzzled me. Would need your `Activity` code so we can get to the bottom of it. — LightYearsBehind, Sep 30 '16 at 04:37
Debug it and check it. you got idea what actually happened there. — SANAT, Sep 30 '16 at 04:53

score 0 · Answer 1 · answered Sep 30 '16 at 06:14

0

If the TextView needs to be always set visible in this part of the code:

if (indexStatus.getVisibility() != View.VISIBLE) {
    indexStatus.setVisibility(View.VISIBLE);
}

then remove the if part.

answered Sep 30 '16 at 06:14

JD Hernandez

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Android : TextView setText only works at the first time

1 Answers1