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POChanging UI in an OnclickListener that attaches to an AsyncTask
 

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  1. POChanging UI in an OnclickListener that attaches to an AsyncTask
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    <p>I have an OnClickListener that from what I understand should run a method called changeTitleToYellow, which changes a textview to a yellow background and changes the text.</p> <p>My onClickListener looks like the following:</p> <pre><code> relayButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { changeTitleToYellow(); System.out.println(tvSocketConnection.getText().toString()); if (relayStatusArray[relayNumber] == 0) { if (cPanel.TurnOnRelay(relayNumber, 1) == false) { changeTitleToRed(); }else{ changeTitleToGreen(); } } else { if (cPanel.TurnOffRelay(relayNumber, 1) == false){ changeTitleToRed(); }else{ changeTitleToGreen(); } } relayStatusArray = cPanel.getBankStatus(1); updateButtonText(); } }); </code></pre> <p>The changeTitleToYellow method does get triggered and completes and it continues on down to the if statements which trigger methods in another class with an AsyncTask in it. However the title never turns to yellow. The code runs, but the UI changes don't come into effect until after the AsyncTask completes.</p> <p>I checked and the changeTitleToYellow method runs on the UI thread so its not that.</p> <p>I'm pretty sure its just the way android operates, but does anyone know why it will run the code but not change the UI?</p> <p><em>edit</em></p> <p>Here is the changeTitleToYellowMethod:</p> <pre><code>public void changeTitleToYellow(){ System.out.println("In Change Title Yellow Method"); tvSocketConnection.setBackgroundColor(Color.YELLOW); tvSocketConnection.setText("NCD TCP Relay: Connecting...."); System.out.println("Endof Yellow"); } </code></pre>
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    1. USPoodimizer
    1. USPoodimizer
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    1. COHow fast is it to complete the method ? Did you try sleeping in the doBackground methods of your async tasks ? It's maybe just to fast and then the last background change cancels the previous one if it s not done yet. Something like that..
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      1. POChanging UI in an OnclickListener that attaches to an AsyncTask
      1. USSnicolas
    2. COhow are you changing the color?
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      1. USMacarse
    3. COAdded the code to the question It takes very little time. We've tried running it multiple times over to see if that would work, but it never updates until the AsyncTask is finished with its socket communciations, which defeats the purpose of changing the textview to yellow. we tried a thread sleep and all it did was give the button press a delay
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      1. POChanging UI in an OnclickListener that attaches to an AsyncTask
      1. USPoodimizer
 

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