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POViewRoot$CalledFromWrongThreadException on android app
 

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  1. POViewRoot$CalledFromWrongThreadException on android app
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    <p>I have read some threads regarding this and I did already take steps to resolve it. I am using a handler (so that I don't update the UI on a separate thread) and so far I can't understand why this is still happening.</p> <pre><code>public class MyApp extends Activity implements OnClickListener, Runnable { private ViewSwitcher switcher; private static final int REFRESH_SCREEN = 1; private boolean isValid = false; private ProgressDialog dialog; private TextView errorMessage; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button = (Button)findViewById(R.id.button1); button.setOnClickListener(this); TextView errorMessage = (TextView)findViewById(R.id.txtErrorMessage); errorMessage.setVisibility(View.GONE); switcher = (ViewSwitcher) findViewById(R.id.profileSwitcher); } public void onClick(View v) { isValid = false; dialog = ProgressDialog.show(ConcentraApp.this, "", "Loading. Please wait...", true); Thread thread = new Thread(this); thread.start(); } public void run() { String username = ((TextView)findViewById(R.id.txtUsername)).getText().toString(); String password = ((TextView)findViewById(R.id.txtPassword)).getText().toString(); errorMessage = (TextView)findViewById(R.id.txtErrorMessage); errorMessage.setVisibility(View.GONE); /* ... contact web service and get response ..*/ try { /* get result from web service */ isValid = Boolean.parseBoolean(result); if(isValid) { handler.sendEmptyMessage(1); } else { handler.sendEmptyMessage(0); } } catch (Exception e) { handler.sendEmptyMessage(2); isValid = false; } } private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { if(msg.what == 1) { errorMessage.setVisibility(View.VISIBLE); errorMessage.setText("Correct login"); switcher.showNext(); } else if(msg.what == 0) { errorMessage.setVisibility(View.VISIBLE); errorMessage.setText("Invalid login"); } else { errorMessage.setVisibility(View.VISIBLE); errorMessage.setText("Internet error"); } dialog.dismiss(); } }; } </code></pre> <p>I am very new to this so I wouldn't be surprised if I'm missing something obvious. It works fine without the thread, but then the process dialog doesn't show.</p> <p>Many thanks in advance</p>
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    1. USNick
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