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POonClick Listener Code doesn't show Toasts
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  1. POonClick Listener Code doesn't show Toasts
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    copied!<p>I have a simple layout employing 3 buttons. I have a listener on the first button. It gets called as expected on a click. The listener checks a few things, possible downloads a few files, then starts another activity.</p> <p>During the file download, I'd like to inform the user that a download is going on. I tried the usual suspects, but I saw that using a ProgressBar would be alot of code. So I tried something smaller: I used a Toast to display a message, then disable the 3 buttons for the download duration. This is the code:</p> <pre><code>int version_pre = getCurrentVersion(); //Check files on remote server String URL = Data._URL + "/" + Data.OWNER + "/version"; if(!this.downloadFile(URL, "version")) { Toast.makeText(this, "Download der Dateien fehlgeschlagen. Fahre mit lokaler Version fort.", Toast.LENGTH_LONG).show(); } int version_post = getCurrentVersion(); if(version_pre != version_post) { //Neu Dateien besorgen Button b1 = (Button)findViewById(R.id.btn_Prospekt); b1.setEnabled(false); b1 = (Button)findViewById(R.id.btn_Einheitenumrechner); b1.setEnabled(false); b1 = (Button)findViewById(R.id.btn_Sonstiges); b1.setEnabled(false); Toast.makeText(this, "Aktualisierung der Dateien wird gestartet.", Toast.LENGTH_LONG).show(); if(!fetchAllFiles()) { Toast.makeText(this, "Download der Dateien fehlgeschlagen. Fahre mit lokaler Version fort.", Toast.LENGTH_LONG).show(); } b1 = (Button)findViewById(R.id.btn_Prospekt); b1.setEnabled(true); b1 = (Button)findViewById(R.id.btn_Einheitenumrechner); b1.setEnabled(true); b1 = (Button)findViewById(R.id.btn_Sonstiges); b1.setEnabled(true); } return ""; </code></pre> <p>The problem is this: Even when debugging, I cannot see that any of the GUI changing mechanisms actually do anything. Disabling the buttons should grey them out. It doesn't. Calling the Toast.maketext().show() should display a message. It doesn't.</p> <p>I suspect that this might be expected behaviour as it concerns multiple mechanisms. Is there a restriction as to what I can call in an action listener that will change the UI? Do I need to call a refresh() kinda method when changing the UI while in a Listener?</p> <p>Thanks.</p>
 

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