@Override
    public void clear() {
        mStorage.clear();
        mHandler.removeCallbacks(mFlushCaller);
        mHandler.postDelayed(mFlushCaller, FLUSH_DELAY_FAST);
    }
Flush data too many times, may drain battery.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/persist/StringMapRepo.java