MultiCallback.java 文件源码

/**
 * Associates given {@link Callback}. If callback has been already added, nothing happens.
 *
 * @param callback Callback to be associated
 */
public void addView(final Callback callback) {
    for (int i = 0; i < mCallbacks.size(); i++) {
        final CallbackWeakReference reference = mCallbacks.get(i);
        final Callback item = reference.get();
        if (item == null) {
            // Always remove null references to reduce list size
            mCallbacks.remove(reference);
        }
    }
    mCallbacks.addIfAbsent(new CallbackWeakReference(callback));
}