Develop Reference

ImageView with spacing even with `wrap_content`

Can someone help me? My ImageView gets huge spacing for no apparent reason. Xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/fragment_container_3"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_marginTop="50dp"
android:id="#+id/scroll"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/cv1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:layout_marginBottom="6dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
card_view:cardElevation="10dp"
card_view:cardCornerRadius="4dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/img"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginBottom="0dp"
android:padding="0dp"
android:src="#drawable/list_cli2"
android:contentDescription="123" />
<TextView
android:id="#+id/totalCli"
android:layout_width="300dp"
android:paddingBottom="10dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:textColor="#fff"
android:layout_marginTop="10dp"
android:text="Total de Clientes: Buscando..."
android:textAllCaps="false"
android:textAppearance="#style/TextAppearance.AppCompat.Title" />
<com.github.mikephil.charting.charts.PieChart
android:id="#+id/cliChar"
android:layout_width="300dp"
android:layout_height="200dp"
android:layout_centerHorizontal="true"
android:layout_marginTop="21dp" />
</RelativeLayout>
</android.support.v7.widget.CardView>
...
</RelativeLayout>
</ScrollView>
<android.support.design.widget.FloatingActionButton
android:id="#+id/refresh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom|right"
android:layout_marginRight="18dp"
android:layout_marginBottom="60dp"
android:clickable="true"
app:backgroundTint="#android:color/background_dark"
app:fabSize="normal"
app:srcCompat="#drawable/refresh"/>
</FrameLayout>
Stays like this:
If I set the android: layout_height = "" with a low value, type 200dp, the spacing goes away, but in this case, on smaller devices, the view will be out of date. Already tried:
Placing the image as the background of a LinearLayout but the spacing was both above and below.
Placing the ImageView inside the LinearLayout however has done the same thing as above.
Does anyone know how to solve it?
If I put it outside the ScrollView, ImageView is centered in the middle of the screen

Add this to your imageview:
android:scaleType="centerCrop"
The scale type property will tell how the image should fit within the available space. Center crop will make it fill the whole space, but as a trade off the image will seem zoomed. There are other scale types you can try here.

It looks like your list_cli2 drawable already has the white space. Check it by open it with the image editor and see if the white space is there.

Android how to change the black default background color of the app

I tried everything that i can possibly do but it seems like it requires a different approach to change the color of the black default blackground.
Here is the picture: http://imgur.com/a/CkQGX
Here is the code:
<?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="wrap_content"
android:background="#EE7469"
android:orientation="horizontal">
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_margin="8dp"
card_view:cardUseCompatPadding="true"
card_view:cardCornerRadius="10dp"
android:background="#689F38"
card_view:cardElevation="5dp"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/list_item_string"
android:layout_centerVertical="true"
android:layout_alignParentStart="true"
android:paddingStart="8dp"
android:textSize="18sp"
tools:textSize="12sp"
android:background="#689F38"/>
<!-- ADDED SPACER VIEW -->
<View
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#689F38"
android:layout_weight="1"
/>
<!-- /ADDED SPACER VIEW -->
<Button
android:layout_marginTop="10dp"
android:id="#+id/delete_btn"
android:layout_width="30dip"
android:layout_height="30dip"
android:layout_gravity="right"
android:background="#android:drawable/ic_delete"/>
<Button
android:layout_marginTop="10dp"
android:id="#+id/edit_btn"
android:layout_width="30dip"
android:layout_height="30dip"
android:layout_toStartOf="#id/delete_btn"
android:layout_gravity="right"
android:layout_marginRight="40dp"
android:background="#android:drawable/ic_delete"
/>
</android.support.v7.widget.CardView >
</RelativeLayout>
I tried changing the background color but it's still black.

Try use:
card_view:cardBackgroundColor="#689F38"
So code be like this:
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_margin="8dp"
card_view:cardUseCompatPadding="true"
card_view:cardCornerRadius="10dp"
card_view:cardBackgroundColor="#689F38"
card_view:cardElevation="5dp"
android:layout_height="match_parent">
If you want to change programatically use:
your_cardview.setCardBackgroundColor(your_color);

I thought the problem is in inflating the view in adapter
use below code in layout inflation
View v = inflater.inflate(R.layout.item_layout, parent, false);

You can use a relative layout or linear layout in cardview and set the width and height "match_parent" and set the cardeview color "transparent" as below
android:background="#android:color/transparent"
And set the the linear or relative layout background #689f38

Unwanted paddings or margin in ImageView

I am brand new to android to android development and just playing around with xmls for building layouts. I wrote the following code stuffs for printing a hello ubuntu and inserting an image in it. But the Image seems to have a unwanted upper and bottom padding or margin (not sure what it's called) which looks wierd. Please anyone help me removing it. Here is my code :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="#color/colorAccent"
android:orientation="vertical"
android:padding="10dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:layout_margin="8dp"
android:text="Hello Ubuntu (16.06LTS)"
android:background="#color/colorPrimary"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="0dp"
android:src="#mipmap/Ubuntu"
android:layout_margin="0dp"/>
</LinearLayout>
Screenshot here(see the preiew on right side):

those extra padding is autogenerated since the android would try to get the original aspect ratio. please try below
scaletype = "fitCenter"
android:adjustViewBounds="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"

You should use android:scaleType (see documentation).
This will allow you to tell the view how to react if the image does not have the exact size of the view.

You can try
android:adjustViewBounds="true",
it works for me.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="#color/colorAccent"
android:orientation="vertical"
android:padding="10dp"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:layout_margin="8dp"
android:text="Hello Ubuntu (16.06LTS)"
android:background="#color/colorPrimary"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="#drawable/asd"
android:layout_margin="0dp"
android:adjustViewBounds="true"
/>
</LinearLayout>

There is a margin above the imageview but it is not the part of imageview. It is actually because of margin applied to the textview above the imageview. You can do the following code.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="#00ffff"
android:orientation="vertical"
android:padding="10dp"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:text="Hello Ubuntu (16.06LTS)"
android:background="#000000"/>
<ImageView
android:layout_width="371dp"
android:layout_height="match_parent"
android:padding="0dp"
android:background="#ff0000"
android:layout_margin="0dp"
/>
EDIT -
In your above code, you have applied Margin to all the sides of the view. (android:layout_margin="8dp")
This gives the margin to the view from all the 4 sides including the bottom one, which appears as the imageview's top margin.
Hence, what you need to do is to apply margin to the view side by side by changing
android:layout_margin="8dp"
to
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginUpper="8dp"
EDIT 2 -
Make sure you have 0 padding and 0 margin in the parent (root) container.

my ImageButton lose it's animation effect on adding background color

whenever i set android:background="colorxxx" for my ImageButton, the effect of pressing ImageButton will lost.
before adding that attribute it has an effect filling the image with dark color
i want it works too when ImageButton has android:background="colorxxx"
my layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:context=".HomeActivity">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:background="#color/ColorPrimary"
android:layout_height="?attr/actionBarSize">
<ImageButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/ColorPrimary"
android:src="#drawable/a"
android:layout_weight="50"
android:adjustViewBounds="true" />
<ImageButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/ColorPrimary"
android:src="#drawable/b"
android:layout_weight="50"
android:adjustViewBounds="true" />
<ImageButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/ColorPrimary"
android:src="#drawable/c"
android:layout_weight="50"
android:adjustViewBounds="true" />
<ImageButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/ColorPrimary"
android:src="#drawable/d"
android:layout_weight="50"
android:adjustViewBounds="true" />
</LinearLayout>

The ripple effect is part of the background, like android:background="?attr/selectableItemBackground", if you set a background yourself, the ripple will no longer work.
You can instead change the tint of your button as stated in this other response

I found the solution by adding android:background="?attr/selectableItemBackground" insted of color hex
Link: Apply Material Design Touch Ripple to ImageButton?

Transparent CardView Child Shadow Does Not Appear

I have a CardView with cardBackgroundColor set to Transparent. and cardElevation set to 3dp
In the CardView it has an ImageView. I am wondering why there is no shadow on the ImageView.
Note: I purposely wrap the ImageView inside CardView to generate shadow on Pre Lollipop devices, but it doesn't seem to work.
Any idea please?

Set padding to parent view of card view to 3dp.
Like,
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp"
android:background="#android:color/white">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="8dp"
android:id="#+id/card1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:orientation="horizontal">
<ImageView
android:id="#+id/imgCard"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_margin="10dp"
android:src="#drawable/add_contact" />
<TextView
android:id="#+id/tvColor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Card View" />
</LinearLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>