Develop Reference

How to add space between bitmap of spinner selector and items of drop down list

I have following spinner:
<Spinner
android:id="#+id/safe_network_time_spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:background="#drawable/spinner_selector"
android:entries="#array/schedule_edit_days_repeat"
android:popupBackground="#drawable/custom_dropdown_white_background"
android:spinnerMode="dropdown"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/divider4"
tool:listitem="#layout/custom_dropdown_spinner_button" />
The spinner_selector is:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<bitmap android:gravity="right|center_vertical" android:src="#drawable/down_red_arrow" />
</item>
</selector>
The dropdown list appears like this:
When I select an item of the dropdown list, if it is too long it overlaps the arrov bitmap. how can I avoid this?

Try using a layer-list
bg_spinner.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<!-- This is the actual spinner background -->
<selector >
<!-- Feel free to use your own drawable for these states -->
<item android:state_window_focused="false" android:drawable="#drawable/bg_border_accent_thin"/>
<item android:state_pressed="true" android:drawable="#drawable/bg_border_accent_thin"/>
<item android:state_window_focused="true" android:state_pressed="false" android:drawable="#drawable/bg_border_grey_thin"/>
</selector>
</item>
<!-- This is the spinner drawable, use your custom drawable aswell. android:right does the magin to separate this drawable from the spinner content-->
<item android:drawable="#drawable/ic_ripple_arrow"
android:gravity="center_vertical|right"
android:right="16dp"/>
</layer-list>
Edit 02/02/2020
My apologies for a weekend-long lunch.
If you are using the androidx dependencies (which I suggest you do) here's the code that I use to properly add spacing between the text and the selected item in the spinner.
On your layout.xml
<!-- The line I think you need is the one giving padding to the right -->
<androidx.appcompat.widget.AppCompatSpinner
android:paddingTop="4dp"
android:paddingBottom="4dp"
android:paddingRight="36dp"
android:background="#drawable/bg_spinner"
android:popupBackground="#drawable/bg_spinner_popup"/>
The bg_spinner.xml is the one provided a couple of lines above.
And the popup one doesn't really matter, since it gives some directives on how to paint a background, nothing important but here it is either way...
bg_spinner_popup.xml
<?xml version="1.0" encoding="utf-8" ?>
<shape xmlns:android="http://schemas.android.com/apk/res/android
android:shape="rectangle">
<corners android:radius="3dp"/>
<solid android:color ="#android:color/white"/>
<stroke android:width="5px" android:color="#color/primaryColor"/>
</shape>

centered element in background doesn't match centered element in foreground

I'm working on an Android application where I want to create a windowBackground with a centered element and a layout also with a centered element. I want these elements to be in the exact same position, with the layout overlapping the background. The problem I'm having is that the layout and the background seem to be calculating center differently (see image). Why is this happening, and what can I do to line the elements up?
This is what I see right now. The red box is created by the background and the green box is created by the foreground. Screenshot was created with a Nexus 5X API 26 emulator.
Foreground layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<View
android:background="#color/foreground_box"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_centerInParent="true" />
</RelativeLayout>
Background Drawable (applied via android:windowBackground in my theme)
<?xml version="1.0" encoding="UTF-8" ?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/background" />
<item android:gravity="center">
<shape
android:gravity="center"
android:shape="rectangle">
<solid android:color="#color/background_box" />
<size android:width="10dp"
android:height="10dp" />
</shape>
</item>
</layer-list>
For clarity, my colors file is
<?xml version="1.0" encoding="utf-8"?>
<resources>
...
<color name="background">#ffffff</color>
<color name="background_box">#AAFF0000</color>
<color name="foreground_box">#AA00FF00</color>
</resources>
Full source for this sample project is available at https://github.com/HofmaDresu/AndroidCenteredTest

The reason windowBackground includes both the heights 1) statusBar and 2) actionBar
Modify below line in your background.xml
<item android:gravity="center" android:top="80dp"> // 56 actionBarSize + 24 statusBarHeight
You may need to manage this programatically as statusBarHeight and actionBarSize varies based on device API/resolution.
Here is the result. For testing, have resized background size bit bigger so that overlapping between views and background become visible.

It is probably because of the extra space taken up by the ActionBar in the foreground.
To fix this, you can add a margin to your View in the foreground layout as:
android:layout_marginBottom="?android:attr/actionBarSize"

After test it in AS, I can say you that the right code for you background_drawable is this:
<?xml version="1.0" encoding="UTF-8" ?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/background" />
<item android:gravity="center" android:bottom="48dp">
<shape
android:gravity="center"
android:shape="rectangle">
<solid android:color="#color/background_box" />
<size
android:width="10dp"
android:height="10dp" />
</shape>
</item>
using android:top, the red square go more down than center. Need to use android:bottom instead to center background. By my tests results that 48dp is the right value.

weird Looking seekbar in Android Tablets

I am working on an APP Which supports both phones and tablets.
Phones it is working fine but when i run the same in 7" tablet the seekbar looks weird ...
can anybody help me with this
This the custom xml i have used to show the seekbar
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#android:id/background"
android:drawable="#drawable/progress_unselected">
</item>
<item
android:id="#android:id/secondaryProgress"
android:drawable="#drawable/secondary_progress">
</item>
<item
android:id="#android:id/progress"
android:drawable="#drawable/progress_selected">
</item>
</layer-list>
My seekbar is inside a RelativeLayout with android:layout_alignParentBottom="true"
<SeekBar
android:id="#+id/SeekBarTestPlay"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/adView"
android:layout_alignParentBottom="true"
android:layout_marginLeft="5.0dip"
android:layout_marginRight="10.0dip"
android:max="99"
android:paddingBottom="10.0dip"
android:progressDrawable="#drawable/progressbar"
android:thumb="#drawable/progress_indicator"
android:thumbOffset="0.0dip" />

You need to make this background nine patch and make dither true. This gives perfect background without break.
<item android:id="#android:id/background">
<nine-patch xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/seek"
android:dither="true" />
</item>

How to add number scale inside android seekbar?

I'm trying with the custom seekbar inside have number scale, But is not working. This seekbar must support all screen resolutions. how can i make like this. Please give your valuable idea.
My custom_seekbar.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#+android:id/background"
android:drawable="#drawable/unselect"/>
<item
android:id="#android:id/secondaryProgress"
android:drawable="#drawable/select">
</item>
<item
android:id="#android:id/progress"
android:drawable="#drawable/select">
</item>
activity_main.xml
<LinearLayout 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="#color/default_screen_bg"
android:orientation="vertical"
tools:context=".MainActivity" >
<SeekBar
android:id="#+id/seekBar1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:indeterminate="false"
android:max="10"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:progressDrawable="#drawable/custom_seekbar" />
</LinearLayout>
Unselesct.png
select.png
myresult screen like this
I'm expecting like this

There's number to solutions to the problem:
Use 9patch image for backgorund (which is basically should be used as background for seekbar). Like the following:
(name should be unselect_patch.9.png) and slightly modify custom_seekbar.xml to look like the following:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#android:id/background"
android:drawable="#drawable/unselect_patch"/>
<item android:id="#android:id/secondaryProgress">
<clip>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/select"
android:tileMode="disabled" />
</clip>
</item>
<item android:id="#android:id/progress">
<clip>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/select"
android:tileMode="disabled" />
</clip>
</item>
</layer-list>
Just provide exact size of the image in layout (e.g. layout_width="#dimen/select_image_width");
To support all resolutions - provide images for different resolutions, as described in Supporting Multiple Screens. The same images will not work fine for all resolutions and here's better just follow best practices described in detail at the link above.

How can i make an "Gmail" like header buttons? (Pic attached)

Does any one knows how can i skin an android button to look like this:
a busy cat http://www.11sheep.com/temp/picForSO.jpg
Thanks in advance,
Lior

The following layout files will product a button with 5px radius, of course u input your own color and change the solid color to gradient to match ur screenshots, then on the button change the text colour to white or something.. I dont have time for examples now.. good luck though.
and lastly you have to apply them as background to your button like this
<Button
android:id="#+id/btnLoveThisOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:text="Love me love u too!"
android:background="#drawable/button_background" <!-- Yes look at me -->
/>
button_background_normal.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/button_background_normal_color"/> <!-- Change this to your own colour -->
<corners android:radius="5px"/>
<stroke android:width="1dp" android:color="#20ffffff"/>
</shape>
button_background_pressed.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/button_background_pressed_color"/> <!-- Change this to your own colour -->
<corners android:radius="5px"/>
</shape>
button_background.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true"
android:state_pressed="false"
android:drawable="#drawable/button_background_normal" />
<item android:state_focused="true"
android:state_pressed="true"
android:drawable="#drawable/button_background_pressed" />
<item android:state_focused="false"
android:state_pressed="true"
android:drawable="#drawable/button_background_pressed" />
<item android:drawable="#drawable/button_background_normal" />
</selector>

I know two ways to make it:
a Button or TextView with an image having that engraving rectangle, for stretch, use 9.patch :)
a Button or TextView with transparent background and a selector drawing the shape border
However, I don't know exactly how they did as shown in your picture.