How to show / hide ImageView in FrameLayout

Question

Im trying to show / hide a specifically ImageView, that it's inside a FrameLayout. At the same time, im gonna hide or show (on the contrary to ImageView), the LinearLayout with id recents_linear_layout

<com.android.systemui.recent.RecentsPanelView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/recents_root"
android:layout_height="match_parent"
android:layout_width="match_parent">

<FrameLayout
    android:id="@+id/recents_bg_protect"
    android:background="@drawable/status_bar_recents_background"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentBottom="true"
    android:clipToPadding="false"
    android:clipChildren="false">

    <com.android.systemui.recent.RecentsHorizontalScrollView android:id="@+id/recents_container"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginRight="@dimen/status_bar_recents_right_glow_margin"
        android:divider="@null"
        android:stackFromBottom="true"
        android:fadingEdge="horizontal"
        android:scrollbars="none"
        android:fadingEdgeLength="@dimen/status_bar_recents_fading_edge_length"
        android:layout_gravity="bottom|left"
        android:orientation="horizontal"
        android:clipToPadding="false"
        android:clipChildren="false">

        <LinearLayout android:id="@+id/recents_linear_layout"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:clipToPadding="false"
            android:clipChildren="false">
        </LinearLayout>


    </com.android.systemui.recent.RecentsHorizontalScrollView>

**<ImageView android:id="@+id/landscape"
    android:gravity="center"
    android:layout_gravity="center"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="0.0dip"
    android:src="@drawable/landscape_img"
    android:visibility="gone" />**

</FrameLayout>

<include layout="@layout/status_bar_no_recent_apps"
    android:id="@+id/recents_no_apps"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:visibility="invisible" />

</com.android.systemui.recent.RecentsPanelView>

My java code, throws a NullPointerException, because it cant find the ImageView (because this is being executed on com.android.systemui.recent.RecentsHorizontalScrollView. This is the code

    mLinearLayout = (LinearLayout) findViewById(R.id.recents_linear_layout);
    mLinearLayout.setVisibility(mRecent ? LinearLayout.GONE : LinearLayout.VISIBLE);
mLandScape = (ImageView) findViewById(R.id.landscape);
mLandScape.setVisibility(mRecent ? View.VISIBLE : View.GONE);

Thanks in advance.

The ImageView is outside the scope of your RecentsHorizontalScrollView you'd have to pass it in somehow — Blundell, Apr 22 '12 at 19:25
Yes, that's what I need. But I have no Idea how to retrieve the ID, for using the findViewById Method EDIT: Seems like I fixed it, edited main post — user809486, Apr 22 '12 at 19:27
Yep you moved it into scope. You shouldn't really edit it, just answer your own question below instead. — Blundell, Apr 22 '12 at 19:35

score 0 · Answer 1 · answered Apr 22 '12 at 19:32

you could use ((Activity)getContext()).findViewById(R.id.landscape) though you should avoid it since there is no guarantee that the context is an activity. I can't understand why you are trying to hide some views inside this view. I think this is the activity's responsibility. You should make some interface with call back method to notify the activity about your event then let it hide the image view.

score 0 · Answer 2 · answered Apr 23 '12 at 13:41

FIXED Fix was making a external layout container with old Layout and ImageView as childs

    <com.android.systemui.recent.RecentsHorizontalScrollView android:id="@+id/recents_container"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginRight="@dimen/status_bar_recents_right_glow_margin"
        android:divider="@null"
        android:stackFromBottom="true"
        android:fadingEdge="horizontal"
        android:scrollbars="none"
        android:fadingEdgeLength="@dimen/status_bar_recents_fading_edge_length"
        android:layout_gravity="bottom|left"
        android:orientation="horizontal"
        android:clipToPadding="false"
        android:clipChildren="false">

        <LinearLayout android:id="@+id/child_container"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:clipToPadding="false"
            android:clipChildren="false">

            <LinearLayout android:id="@+id/recents_linear_layout"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:orientation="horizontal"
                android:clipToPadding="false"
                android:clipChildren="false" />

        <ImageView android:id="@+id/sense_landscape"
        android:gravity="center"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="0.0dip"
        android:src="@drawable/sense_landscape"
        android:visibility="visible" />



        </LinearLayout>


    </com.android.systemui.recent.RecentsHorizontalScrollView>

How to show / hide ImageView in FrameLayout

2 Answers2