Develop Reference

How to correctly use listSeparatorTextViewStyle for ExpadanbleListView header items?

I've spent a lot of time looking for a way to get the default header state indicator (▲/▼) to show on my ExpadanbleListView header item (something I would expect to be trivial). Eventually, I've found mention of the android:attr/listSeparatorTextViewStyle style. So I tried this in my group view layout XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<TextView
style="?android:attr/listSeparatorTextViewStyle"
android:id="#+id/firmwareItemHeader"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_width="wrap_content"
android:layout_height="50dp"/>
</LinearLayout>
But the result is wrong - the indicator overlaps with the text:
How to fix this?
Of note: the ExpandableListView has android:indicatorRight="?android:attr/expandableListPreferredChildIndicatorRight".
As you can see, my header view layout is a primitive single TextView, and it's going to stay that way. I'll happily use a default view with an indicator instead of my own XML, if such a view exists (I couldn't find one).
One can set a custom #drawable indicator via android:groupIndicator attibute of the list view, but again, I can't find any default value.

Material ripple effect hidden by other view in layout

I added a ripple effect on a ImageButton, however it is hidden by an ImageView used as a background for the parent view RelativeLayout.
Here's the layout file:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="172dp"
android:orientation="vertical"
android:theme="#style/ThemeOverlay.AppCompat.Dark">
<ImageView
android:id="#+id/drawerBackgroundImageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="#drawable/drawer_background"/>
[...]
<ImageButton
android:id="#+id/drawerLogoutButton"
android:layout_width="32dp"
android:layout_height="32dp"
android:layout_alignBottom="#id/drawerEmailTextView"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_marginEnd="#dimen/activity_horizontal_margin"
android:layout_marginRight="#dimen/activity_horizontal_margin"
style="#style/FlatButtonStyle"
android:scaleType="centerInside"
android:src="#drawable/ic_logout_white_24dp"/>
</RelativeLayout>
(there's a bunch of other views but they're irrelevant here)
I'm using an ImageView as the background for the RelativeLayout as I need to set a specific scaleType for the image, so I can't use the basic android:background property.
The ripple effect is hidden as it doesn't have a mask layer (I want it to extend out of the button's bounds) and thus uses the ImageButton's parent view to be displayed. The effect is perfectly visible if I remove the ImageView.
Is there a way to get the ripple effect to be shown above the problematic ImageView?

I had exactly the same issue and solved it using this thread: https://code.google.com/p/android/issues/detail?id=155880
Issue preview:
Before solved:
After solved:
Explanation:
"Borderless buttons draw their content on the closest background. Your button might not be having background between itself and the ImageView, so it draws underneath the ImageView."
Solution:
"Use a transparent background (android:background="#android:color/transparent") on some layout containing the button (beneath the ImageView). This will dictate what the maximum bounds of the ripple effect is."
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
...>
<!-- Your background ImageView -->
<ImageView
android:id="#+id/drawerBackgroundImageView"
android:src="#drawable/drawer_background"
... />
<!-- ... -->
<!-- HERE, you need a container for the button with the transparent
background. Let's say you'll use a FrameLayout -->
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#android:color/transparent">
<!-- Maybe more items -->
<!-- Button with borderless ripple effect -->
<ImageButton
android:id="#+id/drawerLogoutButton"
android:background="?selectableItemBackgroundBorderless"
... />
</FrameLayout>
</FrameLayout>
Hope it helps.

I am experiencing same issue. Only solution I have found so far is not 100% okay since ripple is masked by view (its not borderless).
The solution (workaround):
surround your ImageButton with other view and set ripple to the foreground instead of the background in your layout like this:
<ImageView ... />
<FrameLayout
...
android:clickable="true"
android:focusable="true"
android:foreground="?attr/selectableItemBackgroundBorderless" >
<ImageButton />
</FrameLayout>
I would be really glad if someone explain why the ripple is drawn behind the image. Also if you look at Google Photos app, in image detail they have transparent icons over image view with ripple. I would like to replicate this, but I am not able to make the ripple to be in foreground. Does anybody know how to put transparent imagebuttons over everything but still have the ripple?
EDIT final solution
here you can find exactly same question link
with great explanation what is happening. the solution is the same but on top of that it solves rectangular mask by adding
android:clipChildren="false"
android:clipToPadding="false"
to your layout. now your ripple should be borderless (it worked for me).
The layout xml could be something like this:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
...
android:clipChildren="false"
android:clipToPadding="false">
<ImageView ... />
<FrameLayout
...
android:clickable="true"
android:foreground="?attr/selectableItemBackgroundBorderless">
<ImageView ... />
</FrameLayout>
</FrameLayout>

I'm aware this is an old post but I did struggle with this quite a bit today hence I'm posting what I was finally able to figure out and maybe someone else might benefit from it. One key emphasis beforehand, please do always RTFM!
1) The story
I aimed to use the unbounded ripple effect on Tab Items and consequently have it spread all over the AppBarLayout area. I had applied #android:color/transparent to TabLayout as the first wrapping parent and gave AppBarLayout a background color, nevertheless the ripple was still being cut off right at the borders of TabLayout's height.
2) The moral of the story (RTFM)
So I run to the nest of Android knowledge: The Documentation, and spotted this:
?android:attr/selectableItemBackgroundBorderless for a ripple that extends beyond the view. It will be drawn upon, and bounded by, the nearest parent of the view with a non-null background.
3) The course of action
Using Layout Inspector, I realized that #android:color/transparent although transparent (duh!) it actually assigns 0 as the value of the bg attribute of a View, but zero is not null hence the ripple gets bounded at the nearest parent.
4) The conclusion
With that in hand, I went and set the android:background property of my TabLayout to #null rather than transparent, and now I have a fancy little ripple spread onto the area of the AppBarLayout.
5) Outro: **ANDROID & SO FTW!
Props to everyone in this post who shed light on the matter in word. Cheers!

After wrapping ImageButton inside FrameLayout, I was getting rectangular shape on touch. Applied background with oval shape on FrameLayout and got the circular shape on touch.

Had the same issue. Used the solutions described above and worked. Managed to avoid the wrapping FrameLayout by setting foreground as ?attr/actionBarItemBackground and background as #null.
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center|end"
android:background="#null"
android:contentDescription="#string/app_name"
android:foreground="?attr/actionBarItemBackground"
android:padding="#dimen/small_margin"
android:src="#drawable/ic_clear_text_icon" />

How create and show listview in onDraw method?

I am new in Android, so please help me.
In onDraw method I draw a lot of things, which I would like to have as a background. And when I click in the corner, I would like to have listview (with SeekBars, buttons, etc) and everything which i drow before as a background. This background doesn't have to scroll when the listview is scrolling. How to create and set such listview?
My .xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<com.project.MyView
android:id="#+id/main_view"
android:layout_width="wrap_content"
android:layout_height="fill_parent" />
</LinearLayout>

Make your custom view as background of whole screen . You can do this by making the root view as your custom view .Then calculate the touch on corner and make your child view i.e. list view visible .

How to draw borders and separators on a View

I'm developing an App, and I need to draw borders and separators on a View, like the eBay app.
I think on a combination of shapes and view with 1dp. There is another easy way?
Many thanks.

Create a 9-patch image for the outside border. Use that as the background resource and it will give you the rounded corners with solid border. For dividers, you can create a simple view and have another background resource that's a simple image with the same color as the border in the 9-patch.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#drawable/roundedborder"
android:orientation="vertical">
<!-- Put Saved Searches display code here. Probably LinearLayout/horizonal -->
<TextView
android:layout_width="fill_parent"
android:layout_height="1dp"
android:background="#drawable/simpleborder"
android:layout_margin="3dp"/> <!-- Spacer! -->
<!-- Put Favorite sellers display code here. Probably LinearLayout/horizonal -->
</LinearLayout>
</LinearLayout>

or you could use margins at the bottom, for the view which is just above the empty space.
android:layout_marginBottom="1dp"

If you mean how the views are grouped together so that some have curved corners on top, others in the bottom plus padding or a margin, and others with no curved corners at all, then this is one way to do it.
If you are using ListView with ListAdapter then When overriding getView(int position, View convertView, ViewGroup parent) determine from position what view should be returned and return it. You can change the view's padding and margins before returning it.
Also, it'll be more efficient if you override getItemViewType(int position) and return a constant representation a view type for a specific position so that Android can reuse views and you wont have to inflate a new one or change the attributes every time.

Overlap views in android?

I have a linearlayout which have a textbox(multiline, nearly 5 lines) and image view. Is it possible to draw a image on textview(overlapping)?
Note: I have to specify the coordinates of the image, which are not static, and may be anywhere above text.
Something like this mockup:

I think it can be achieved using RelativeLayout.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/Textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:text="#string/Text2display"
android:textColor="#EEDCAA" />
<ImageView
android:id="#+id/choose_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="-46dp"
android:adjustViewBounds="true"
android:contentDescription="#string/description_logo"
android:src="#drawable/user2" />
</RelativeLayout>
By placing the TextView block above the ImageView, it ensures that the image view overlaps the TextView. Now, based on your requirements and position, use the following commands from the link :-
http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html
You can align left right, top and bottom. Use negative values to navigate the ImageView, if ur using align bottom and stuff.. This will make it to overlap. Please let me know if this was helpful
Is there any specific reason for Linear Layout?

You can do this easily using RelativeLayout . You can have an ImageView overlapping TextView Unless there is a specific reason for using LinearLayout .

If you really (really) need to use LinearLayout, you can subclass TextView and override onDraw to draw your image.

In all your xml files, should define the background color for it, it will solve the problem :
Add this android:background="#android:color/black" in to the View tag you defined.