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Editorial Team
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Asked: 2026-06-06T14:19:28+00:00

I’m making an app which reads the data from a website every interval and

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I’m making an app which reads the data from a website every interval and posting a value to the screen. I’m having difficulty with making it start and stopping it.

I can make the loop start no problem and I can stop it as well. But if I try and start it again, the program crashes.

The code is here:

    final Timer myTimer = new Timer(); 


    loop.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub

            MyTimerTask mytimertask = new MyTimerTask();
            myTimer.scheduleAtFixedRate(mytimertask, 0, 5000);
        }
    });

    stoploop.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            textView.setText("STOPPED");
            myTimer.cancel();

        }
    });


}

private class MyTimerTask extends TimerTask {
    @Override
    public void run() {
        // TODO Auto-generated method stub
        runOnUiThread(new Runnable(){

            public void run() {
                // TODO Auto-generated method stub
                //textView.setText("changed");
                readWebpage(text);
            }

        });

    }

}

I’m quite new to threads which is why I’m probably missing something fundamental here. Any help would be greatly appreciated.

Thank you

[edit] I should add, I adapted this from a solution here:
How do I repeat a method every 10 minutes after a button press and end it on another button press

   06-29 01:38:02.958: D/AndroidRuntime(1119): Shutting down VM
   06-29 01:38:02.958: W/dalvikvm(1119): threadid=1: thread exiting with uncaught exception    (group=0x40a13300)
   06-29 01:38:02.968: E/AndroidRuntime(1119): FATAL EXCEPTION: main
   06-29 01:38:02.968: E/AndroidRuntime(1119): java.lang.IllegalStateException: Timer was canceled
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at    java.util.Timer.scheduleImpl(Timer.java:561)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at    java.util.Timer.scheduleAtFixedRate(Timer.java:528)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at com.example.beam.MainActivity$1.onClick(MainActivity.java:67)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at android.view.View.performClick(View.java:4084)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at android.view.View$PerformClick.run(View.java:16966)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at android.os.Handler.handleCallback(Handler.java:615)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at android.os.Handler.dispatchMessage(Handler.java:92)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at android.os.Looper.loop(Looper.java:137)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at android.app.ActivityThread.main(ActivityThread.java:4745)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at java.lang.reflect.Method.invokeNative(Native Method)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at java.lang.reflect.Method.invoke(Method.java:511)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
   06-29 01:38:02.968: E/AndroidRuntime(1119):  at dalvik.system.NativeStart.main(Native Method)
   06-29 01:38:03.028: W/ActivityManager(156):   Force finishing activity com.example.beam/.MainActivity
   06-29 01:38:03.039: W/WindowManager(156): Failure taking screenshot for (246x410) to layer 21010
   06-29 01:38:03.552: W/ActivityManager(156): Activity pause timeout for ActivityRecord{41366318 com.example.beam/.MainActivity}
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1 Answer

  1. Editorial Team
    private class MyTimerTask extends TimerTask {
    @Override
    public void run() {

                mDialogHandler.sendEmptyMessage(DIALOG_OK);

    }

}

 private Handler mDialogHandler = new Handler(){
            public void handleMessage(android.os.Message msg) {
                    switch (msg.what) {
                    case DIALOG_OK:
                            // We are now back in the UI thread
                            //textView.setText("changed");
                            readWebpage(text);
                    }

            };
    };

    You’re trying to start a Thread from inside a thread which is illegal. I also added some code for your UI Thread woes.

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