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POVisibility of ProgressBar
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copied!<p>I need to process some data when the user click the button in one activity, so the screen looks like the app stops for 2-3 seconds. It isn't a lot but I want to give the user information that everything is ok and IMO the best way will be the progressbar which is visible only when data are processed. </p> <p>I found the code of ProgressBar and it looks like this:</p> <pre><code> <ProgressBar android:id="@+id/loadingdata_progress" style="?android:attr/progressBarStyle" android:layout_width="50dp" android:layout_height="50dp" android:layout_alignBottom="@+id/fin2_note" android:layout_centerHorizontal="true" android:indeterminate="true" android:visibility="invisible" /> </code></pre> <p>and inserted it on the middle of my layout.</p> <p>And to try if the progressbar works, I put this code </p> <p><code>loadingimage= (ProgressBar) findViewById(R.id.loadingdata_progress); loadingimage.setVisibility(View.VISIBLE); </code></p> <p>into <code>onCreate</code> method and everything looks fine. Then I recreated the code to show this progressbar only if the data is processed. </p> <p>After click the user invoke this method </p> <pre><code> public void fin2_clickOnFinalization(View v) { loadingimage= (ProgressBar) findViewById(R.id.loadingdata_progress); loadingimage.setVisibility(View.VISIBLE); // code where data is processing loadingimage.setVisibility(View.INVISIBLE); } </code></pre> <p>and nothing appear on the screen. I don't know where is the mistake. If I found the progress bar by id, It's strange for me that I can control it in onCreate method but in onclick method it's out of my control. </p>

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