Android scroll down not working

Question

I'm trying to add scroll down to one of my relative layout. the problem is that all of the text inside the scroll down disappear (from text view 4 till the end - notes0-nite4). If I put the code at the beginning of the main activity xml its working fine- however I would like to use the scroll down only in one layout. I added a picture of my code

I used the links below but it did not help

How to make my layout able to scroll down? Why My ScrollView not working Properly?

enter image description here

<ScrollView
    android:layout_height="fill_parent"
    android:layout_width="fill_parent"
    android:id="@+id/scroll"
    android:orientation="vertical"
    android:visibility="invisible"
    >

<LinearLayout
    android:id="@+id/howToPlayLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    >



    <TextView
        android:id="@+id/howToPlayText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:gravity="center_horizontal"
        android:text="@string/how_to_play"
        android:textColor="@android:color/black"
        android:textSize="30sp" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="4dp"
        android:text="@string/insert_each_letter_in_the_right_cell_so_when_the_puzzle_is_completed_every_row_and_column_contains_a_real_4_letters_word_4_words_horizontally_and_4_words_vertically_top_to_bottom"
        android:textColor="@android:color/holo_blue_dark"
        android:textSize="17sp"
        android:textStyle="italic" />



    <TextView
        android:id="@+id/textView6"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="10dp"
        android:text="@string/share_a_freind_button_is_used_to_get_friend_s_help_via_whatsapp_facebook_twitter"
        android:textColor="@android:color/holo_blue_dark"
        android:textSize="17sp"
        android:textStyle="italic" />

    <TextView
        android:id="@+id/textView7"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="10dp"
        android:text="@string/lamp_button_can_give_you_a_free_hint_after_watching_a_video_ad"
        android:textColor="@android:color/holo_blue_dark"
        android:textSize="17sp"
        android:textStyle="italic" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="10dp"
        android:text="@string/x_button_is_used_in_order_to_delete_a_letter_which_you_located_wrongly_in_the_puzzle"
        android:textColor="@android:color/holo_blue_dark"
        android:textSize="17sp"
        android:textStyle="italic" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="10dp"
        android:text="@string/the_puzzle_may_also_contains_names"
        android:textColor="@android:color/holo_blue_dark"
        android:textSize="17sp"
        android:textStyle="italic"
        tools:textStyle="italic" />

    <Button
        android:id="@+id/button37"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginLeft="40dp"
        android:layout_marginRight="40dp"
        android:layout_marginTop="10dp"
        android:background="@android:color/holo_blue_dark"
        android:onClick="backToGame"
        android:text="@string/back_to_game1"
        android:textColor="@android:color/white"
        android:textSize="17sp" />

    <Button
        android:id="@+id/button39"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginLeft="40dp"
        android:layout_marginRight="40dp"
        android:layout_marginTop="10dp"
        android:background="@android:color/holo_blue_dark"
        android:onClick="backToMenu"
        android:text="@string/back_to_menu1"
        android:textColor="@android:color/white"
        android:textSize="17sp" />

    <!-- End How to play layout-->


</LinearLayout>
</ScrollView>




 @Override
public boolean onCreateOptionsMenu(Menu menu) {

    MenuInflater menuInflater=getMenuInflater();
    menuInflater.inflate(R.menu.main_menu,menu );

    return super.onCreateOptionsMenu(menu);
} // End onCreateOptionsMenu



@Override
public boolean onOptionsItemSelected(MenuItem item) {
    super.onOptionsItemSelected(item);

    switch (item.getItemId()){

        case R.id.howToPlay:
            ScrollView mScrollView=(ScrollView)findViewById(R.id.scroll);
            mScrollView.setVisibility(View.VISIBLE);

            howToPlayLayout.setVisibility(LinearLayout.VISIBLE);
            note0.setVisibility(View.VISIBLE);
            note1.setVisibility(View.VISIBLE);
            note2.setVisibility(View.VISIBLE);
            note3.setVisibility(View.VISIBLE);
            note4.setVisibility(View.VISIBLE);
            titleHowToPlay.setVisibility(View.VISIBLE);


enter code here

Answer 1

You haven't mentioned an orientation for your LinearLayout

<LinearLayout
    android:id="@+id/howToPlayLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"              //Here
    >

It's horizontal by default so what's happening is that your first TextView howToPlayText takes up the entire width and then the rest aren't visible anymore.