I developed an application to generate keypress. I find out that we
can use Instrumentation object to generate. However, when I run the
following code, I got these errors.

04-27 16:12:16.720: ERROR/AndroidRuntime(4406): Caused by:
java.lang.RuntimeException: This method can not be called from the
main application thread
04-27 16:12:16.720: ERROR/AndroidRuntime(4406):     at
android.app.Instrumentation.validateNotAppThread(Instrumentation.java:
1427)
04-27 16:12:16.720: ERROR/AndroidRuntime(4406):     at
android.app.Instrumentation.sendKeySync(Instrumentation.java:857)
04-27 16:12:16.720: ERROR/AndroidRuntime(4406):     at
android.app.Instrumentation.sendKeyDownUpSync(Instrumentation.java:
871)

Please help. All answers are appreciated.

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

        @Override
        protected void onStart() {
                // TODO Auto-generated method stub
                super.onStart();

                //press key
Instrumentation inst = new Instrumentation();
                inst.sendKeyDownUpSync(KeyEvent.KEYCODE_1);

        }

        @Override
        protected void onStop() {
                // TODO Auto-generated method stub
                super.onStop();
        }

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