I've got this error:
Caused by: java.lang.NullPointerException
        at com.thewayto.doland.Acttimer.onCreate(Acttimer.java:52)
This is the code, the error is in the third line:
       textAlarmPrompt = (TextView)findViewById(R.id.alarmprompt);
    buttonstartSetDialog = (Button)findViewById(R.id.startSetDialog);
    buttonstartSetDialog.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v) {
            textAlarmPrompt.setText("");
            openTimePickerDialog(false);
        }});
}
 
     
    