解决Android SearchView不显示搜索icon的问题

final ImageView searchIcon = (ImageView) mSearchView.findViewById(android.support.v7.appcompat.R.id.search_mag_icon);
mSearchView.post(new Runnable() {
  @Override
  public void run() {
    searchIcon.setImageDrawable(null);
    searchIcon.setVisibility(View.GONE);
  }
});

private void updateViewsVisibility(final boolean collapsed) {
  mIconified = collapsed;
  // Visibility of views that are visible when collapsed
  final int visCollapsed = collapsed ? VISIBLE : GONE;
  // Is there text in the query
  final boolean hasText = !TextUtils.isEmpty(mSearchSrcTextView.getText());
 
  mSearchButton.setVisibility(visCollapsed);
  updateSubmitButton(hasText);
  mSearchEditFrame.setVisibility(collapsed ? GONE : VISIBLE);
 
  final int iconVisibility;
  if (mCollapsedIcon.getDrawable() == null || mIconifiedByDefault) {
    iconVisibility = GONE;
  } else {
    iconVisibility = VISIBLE;
  }
  mCollapsedIcon.setVisibility(iconVisibility);
 
  updateCloseButton();
  updateVoiceButton(!hasText);
  updateSubmitArea();
}