Android worker thread

Question

I would like to make a thread in android that runs in the back. The thread keeps checking the time with a while loop and if it matches it does something. This all works great. But the app is not responsive, as if i'm not running a thread at all. The while still blocks everything. I don't understand why.

code of the thread:

public class AlarmThread implements Runnable {

LocalTime beginTime;
LocalTime endTime;

public AlarmThread(LocalTime beginTime, LocalTime endTime) {
    this.beginTime = beginTime;
    this.endTime = endTime;
}

@Override
public void run() {
     while(true){
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        currentTime = java.time.LocalTime.now();
        if(currentTime.isAfter(beginTime) && currentTime.isBefore(endTime)){
            sendNotification();
         }
      }
}

the activity:

public void onButtonClickerDatepicker(View v) throws IOException {
    LocalTime beginTime = java.time.LocalTime.of(binding.simpleTimePicker.getHour(), binding.simpleTimePicker.getMinute());
    LocalTime endTime = java.time.LocalTime.of(binding.simpleTimePicker2.getHour(), binding.simpleTimePicker2.getMinute());
    alarmThread = new AlarmThread(beginTime, endTime);
    alarmThread.run();

}

Answer 1

Calling Thread.start() to start a thread otherthan Thread.run() . And what's more your AlarmThread is not a Thread but a Runnable. So you can start it by code below:

private Thread workerThread = new Thread(new AlarmThread(start, end))
...
...
workerThread.start()

I recommend you use HandlerThread for flexibility