# Lifecycle Aware Custom Class

Here is an example of timer, it can start and pause and destroy based on current lifecycle of attached Activity, Fragment or even an lifecycle aware [service](https://developer.android.com/reference/androidx/lifecycle/LifecycleService#).

```java
/**
 * @implNote An implementation of lifecycle aware timer, can be attached to Activity or fragment
 */
public class LifecycleAwareTimer implements Runnable, DefaultLifecycleObserver {

    public interface OnIntervalListener extends LifecycleOwner {
        void onTimerInterval();
    }

    private final Handler mHandler = new Handler(Looper.getMainLooper());

    private final long mInterval;

    private final OnIntervalListener mOnIntervalListener;

    public LifecycleAwareTimer(long interval, @NonNull OnIntervalListener onIntervalListener) {
        mInterval = interval;
        mOnIntervalListener = onIntervalListener;

        mOnIntervalListener.getLifecycle().addObserver(this);
    }

    @Override
    public void run() {
        mOnIntervalListener.onTimerInterval();
    }

    @Override
    public void onResume(@NonNull LifecycleOwner owner) {
        mHandler.removeCallbacksAndMessages(null);
        mHandler.postDelayed(this, mInterval);
    }

    @Override
    public void onPause(@NonNull LifecycleOwner owner) {
        mHandler.removeCallbacksAndMessages(null);
    }

    @Override
    public void onDestroy(@NonNull LifecycleOwner owner) {
        mHandler.removeCallbacksAndMessages(null);
        mOnIntervalListener.getLifecycle().removeObserver(this);
    }
}
```


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