Question

In my application I have created a SplashScreen that will b shown for 5 Seconds and after that it executes an if else case depending upon the values stored in the Preference file. If Preference file contains values then the AsyncTask code will run else the Login form will load. When i try to run my application. The thread is going to the Login form with the help of intent but when it comes to AsyncTask my application shows a force close error message.

This is my SplashScreen code:

public class SplashScreen extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splashscreen);

    Thread timer = new Thread()
    {
        public void run()
        {
            try
            {
                sleep(5000);
            }
            catch(InterruptedException e)
            {
                e.printStackTrace();
            }
            finally
            {
                if(GoGolfPref.getEmail(SplashScreen.this)!=null && GoGolfPref.getPass(SplashScreen.this)!=null)
                {
                    new LoadingScreen(SplashScreen.this, SplashScreen.this).execute("login_page", Login.url+GoGolfPref.getEmail(SplashScreen.this)+"/"+GoGolfPref.getPass(SplashScreen.this));
                }
                else
                {
                    Intent in = new Intent(SplashScreen.this, Login.class);
                    startActivity(in);
                    finish();
                }
            }
        }
    };
    timer.start();
}

}

This is the error I am getting:

08-29 07:25:58.040: E/AndroidRuntime(2365): FATAL EXCEPTION: Thread-10
08-29 07:25:58.040: E/AndroidRuntime(2365): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
08-29 07:25:58.040: E/AndroidRuntime(2365):     at android.os.Handler.<init>(Handler.java:121)
08-29 07:25:58.040: E/AndroidRuntime(2365):     at android.app.Dialog.<init>(Dialog.java:101)
08-29 07:25:58.040: E/AndroidRuntime(2365):     at android.app.AlertDialog.<init>(AlertDialog.java:63)
08-29 07:25:58.040: E/AndroidRuntime(2365):     at android.app.ProgressDialog.<init>(ProgressDialog.java:80)
08-29 07:25:58.040: E/AndroidRuntime(2365):     at android.app.ProgressDialog.<init>(ProgressDialog.java:76)
08-29 07:25:58.040: E/AndroidRuntime(2365):     at com.pnf.gogolf.LoadingScreen.<init>(LoadingScreen.java:130)
08-29 07:25:58.040: E/AndroidRuntime(2365):     at com.pnf.gogolf.SplashScreen$1.run(SplashScreen.java:32)

How to get this working?

Thanks in advance…

Answer 1

The problem is you’re making changes to the UI somewhere, but they’re not being done on the UI thread. Anything to do with the user interface has to be done on the UI thread. You do that by encapsulating your code in another runnable and calling runOnUiThread():

runOnUiThread(new Runnable() {
  @Override
  public void run() {
   // set some text views or something
  }
}