当元素不是LinearLayout中的最后一个元素时，setVisibility（View.VISIBLE）不起作用

Question

I'm updating my interface programmatically in order to show an ImageView inside my main menu. It works correctly when the ImageView is the last inside his parent (a LinearLayout). But it doesn't work when it is the first item in Layout or is between some others elements.

This is my layout:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/black"
android:gravity="right"
tools:context=".Actualidad" >

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scaleType="fitStart"
    android:src="@drawable/main_bg" />

<ScrollView
    android:id="@+id/iSV_Botones_drc"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginRight="5dp"
    android:fillViewport="true" >

    <LinearLayout
        android:id="@+id/drc_menu"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="right"
        android:gravity="right"
        android:orientation="vertical" >



        <ImageView
            android:id="@+id/iv_main_actualidad"
            android:layout_width="wrap_content"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:maxWidth="9dp"
            android:src="@drawable/btnmenuiconactualidad" />


         <ImageView
            android:id="@+id/iv_main_discos_giras"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="15dp"
            android:layout_marginTop="@dimen/menu_items_margin_top"
            android:src="@drawable/btnmenuicondiscos"
            android:visibility="gone" />

        <ImageView
            android:id="@+id/iv_main_espectaculos"
            android:layout_width="wrap_content"
            android:layout_height="0dp"
            android:layout_marginTop="@dimen/menu_items_margin_top"
            android:layout_weight="1"
            android:src="@drawable/btnmenuiconeventos" />


    </LinearLayout>
</ScrollView>

And this is the code where I set visible the ImageView (iv_main_discos_giras):

private Handler mResultHandler = new Handler() {
@Override
    public void handleMessage(Message msg) {
        mDiscosGiras.setVisibility(View.VISIBLE);       
        Log.d(getClass().getSimpleName(), "Item visible!!");
    }
};

Log is being shown correctly, and mDiscosGiras has been already initialized:

@InjectView(R.id.iv_main_discos_giras) ImageView mDiscosGiras; here

Answer 1

I've found a hack that is working very well.

I simply make invisible all items below that item for a moment. Then I set visibles all items, from top to bottom.

NOTE: This works also with android:animateLayoutChanges="true" in LinearLayout, with a nice animation.

private Handler mResultHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        mEspectaculos.setVisibility(View.GONE);
        mDiscosGiras.setVisibility(View.VISIBLE);       
        mEspectaculos.setVisibility(View.VISIBLE);
        Log.i(getClass().getSimpleName(), "Ponemos el tema visible");
    }
};