Android：OnFocusChangeListener无法正常工作

Question

大家好我想在焦点更改时在片段中使用可折叠/可扩展的EditText创建搜索选项。以下是我班级的样子：

@ViewById(R.id.search_text)
EditText mSearchText;

@ViewById(R.id.img_clear)
ImageButton mClearButton;

@ViewById(R.id.search_toolbar_text_container)
protected RelativeLayout editTextContainer;

SearchToolbarListener mListener;

private ValueAnimator mAnimator;

@Override
public void onFocusChange(View v, boolean hasFocus) {
//the event here never gets executed 
    if (mListener != null) {
        mListener.onFocusChange(hasFocus);
    }
    mAnimator = slideAnimator(0,editTextContainer.getHeight());


    if (hasFocus && editTextContainer.getVisibility() == View.GONE) {
        expandSearch();
    } else {
        collapseSearch();
    }
}

public interface SearchToolbarListener {

    void onTextChanged(String newText);

    void onFocusChange(boolean isFocused);
}

public SearchToolbarView(Context context) {
    super(context);
}

public SearchToolbarView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public SearchToolbarView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public SearchToolbarView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
}

@AfterViews
public void init() {...}    

public void setListener(@Nullable  SearchToolbarListener mListener) {
    this.mListener = mListener;
}

@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

}

@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    mClearButton.setVisibility(charSequence.length() >= 1 ? View.VISIBLE : View.INVISIBLE);
    if (mListener != null) {
        mListener.onTextChanged(charSequence.toString());
    }
}

@Override
public void afterTextChanged(Editable editable) {

}

private void expandSearch () {
    editTextContainer.setVisibility(VISIBLE);
    mAnimator.start();
}

private void collapseSearch () {
    int finalHeight = editTextContainer.getHeight();
    mAnimator = slideAnimator(finalHeight, 0);

    mAnimator.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationEnd(Animator animator) {
            // Height=0, but it set visibility to GONE
            editTextContainer.setVisibility(View.GONE);
        }

        @Override
        public void onAnimationStart(Animator animator) {
        }

        @Override
        public void onAnimationCancel(Animator animator) {
        }

        @Override
        public void onAnimationRepeat(Animator animator) {
        }
    });
    mAnimator.start();
}

private ValueAnimator slideAnimator(int start, int end) {

    ValueAnimator animator = ValueAnimator.ofInt(start, end);

    animator.addUpdateListener(new     ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            // Update Height
            int value = (Integer) valueAnimator.getAnimatedValue();

            ViewGroup.LayoutParams layoutParams = editTextContainer
                    .getLayoutParams();
            layoutParams.height = value;
            editTextContainer.setLayoutParams(layoutParams);
        }
    });
    return animator;
}
}

然后我在一个像这样的片段中实现接口：

@EFragment(R.layout.fragment_product_search)
public class SearchableSearchFragment extends Fragment implements SearchToolbarView.SearchToolbarListener {

private static final String TAG = SearchableSearchFragment.class.getSimpleName();

@SystemService
protected LayoutInflater mLayoutInflater;

@ViewById(R.id.search_toolbar)
protected Toolbar mSearchToolbar;

protected SearchToolbarView mSearchToolbarView;

@Bean
protected ViewManager mViewManager;

private SearchFragment mSearchFragment;

@Bean
protected BottomNavigationHandler mBottomNavigationHandler;

@AfterViews
public void initAfterViews() {
    mSearchToolbarView = SearchToolbarView_.build(getContext());
}

@Override
public void onTextChanged(String newText) {
    boolean isNumber = NumberUtils.isNumber(newText);

    if ((newText.length() >= 3 && !isNumber) || (isNumber && newText.length() == 7)) {
        this.setToolbarElevation(0);
        mSearchFragment.setSearchQuery(newText);
    } else {
        float elevationInPx = getResources().getDimension(R.dimen.search_bar_elevation);
        this.setToolbarElevation(elevationInPx);
        mSearchFragment.clear();
    }
}

@Override
public void onFocusChange(boolean isFocused) {
//gets called only once
    boolean ggwp = isFocused;
}

此处的问题是焦点更改侦听器无法正常工作。片段启动时仅触发一次。点击左右也不会触发它。我做错了什么？