public void delete(long key) {
        int i = ContainerHelpers.binarySearch(mKeys, mSize, key);

        if (i >= 0) {
            if (mValues[i] != DELETED) {
                mValues[i] = DELETED;
                mGarbage = true;
            }
        }
    }
Removes the mapping from the specified key, if there was any.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/util/collection/LongSparseArray.java