Develop Reference

How to center fit image in linear layout?

I have an xml screen with three children linear layouts in a parent linear layout of vertical orientation. First child contains an image view and when running the application I can not view any image. Why? is the image size too big?? If so.. how to scale it? However Image is view able in my design tab. of android stdudio. Below is my complete code for xml file.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_sign_up"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.root.my_laoder.SignUp"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:src="#drawable/ty"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:orientation="vertical"
android:paddingTop="50dp"
>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingTop="50dp"
>
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"/>
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
/>
</LinearLayout>
</LinearLayout>

1. Add attribute android:gravity="center_horizontal" to LinearLayout, to show ImageView in center.
2. Update ImageView width to android:layout_width="wrap_content" and remove attribute android:layout_gravity="center".
3. Use android:scaleType="fitXY" instead of android:scaleType="centerInside"
Try this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_sign_up"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:src="#drawable/ty" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:orientation="vertical"
android:paddingTop="50dp">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingTop="50dp">
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5" />
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5" />
</LinearLayout>
</LinearLayout>
OUTPUT:

what are the dimens values for these parameters?
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
and why you are using separate linearlayout for imageView even with parent layout as linear?
kindly remove that
have you checked the size of image you are using as a background in ImageView? if size is large than probably image is pushing your rest of your views out of the screen.try to give fixed width and height let's say 100dp for both and see if you are able to see anything.
If you wanna make imageView centre horizontally use in ImagView view
android:layout_gravity="center_horizontal"
above line of code will not work with separate linear layout for ImageView. If you are gonna use separate layout for ImageView anyway, use below line of code inside that linearlayout
android:gravity="center_horizontal"
Note: sorry I'm not able to leave a comment.

Try this for your ImageView:
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:src="#android:drawable/btn_minus" />

I think you missed scaleType of ImageView, Follow the steps to make your image center
1. Add attribute android:layout_gravity="center_horizontal" to show ImageView in center.
2. Set ImageView layout_width="match_parent" and
layout_height="#dimen/fixed_height"
==> height will be fixed but width will automatically adjust
according to device size
3. and set scaleType="fitEnd" or scaleType="fitCenter"
==> fitEnd is ( Scale the image from the end of the container ) and
possible to have space on top
if image is different each time.
==> fitCenter is (Scale the image from center) and possibility to
have space in top and bottom
Example:
<ImageView
android:id="#+id/cover_image"
android:layout_width="match_parent"
android:layout_height="#dimen/fixed_height"
android:layout_gravity="center_horizontal"
android:scaleType="fitEnd" />

How to position this in a coordinator layout?

I'm struggling with making a coordinator layout work. Can someone help me with this?
I just want a simple layout of :
NameLabel, AgeLabel
(Below) Profile pic
(Below)
TextLabel
(Below)
ImageView
instead I get this: and my ageLabel and nameLabel are god knows where.
<android.support.design.widget.CoordinatorLayout
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:id="#+id/activity_home"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".HomeActivity">
<include
layout="#layout/toolbar_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<com.android.volley.toolbox.NetworkImageView
android:id="#+id/home_fb_pic_thumbnail"
android:layout_width="120dp"
android:layout_height="120dp"
android:layout_gravity="top|center"
/>
<TextView
android:id="#+id/nameTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="name" />
<TextView
android:id="#+id/ageTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="age" />
<ImageButton
android:id="#+id/imageButton"
android:layout_width="248dp"
android:layout_height="200dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_gravity="bottom"
android:onClick="startRecording"
app:srcCompat="#drawable/intro_camera_2" />
<TextView
android:id="#+id/introductionTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_gravity="center"
android:text="Introduce Yourself! Video Introductions Last 24 Hours"
android:textAppearance="#android:style/TextAppearance.Material.Medium" />

Those two text views will appear in the design tab if you can notice. But the problem is you haven't specified any constraints as to their placement like you have done for your other views. Place constraints to position them on screen where you want it to for example set left, right,top and bottom margins or align it below some images you already have.Hope that helps.

Android design : a scrollview 3 button below

I'm trying to create a design (and i'm pretty bad at this -__- ) where I will have a scrollview and a set of 3 buttons, horizontally aligned ALWAYS at the bottom of the screen (I mean the scrollview should be ABOVE my layout with my button and may scroll, but the button have to ALWAYS be displayed/visible)
I have already tried several solution, the last one I used is this , but it doesn't succeeded :(
<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<RelativeLayout
android:id="#+id/header"
android:layout_alignParentTop="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</RelativeLayout>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/scroll"
android:layout_above="#+id/footer"
android:layout_below="#+id/header">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imageView1"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Chargement en cours"
android:id="#+id/TNom"
android:layout_below="#+id/imageView1"
android:layout_centerHorizontal="true" />
</RelativeLayout>
</ScrollView>
<RelativeLayout
android:id="#+id/footer"
android:layout_width="match_parent"
android:layout_height="wrap_content">
android:layout_alignParentBottom="true">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:id="#+id/Bplus"
android:onClick="onClickSuivant"
android:layout_toLeftOf="#+id/Begale"
android:layout_toStartOf="#+id/Begale" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="="
android:id="#+id/Begale"
android:onClick="onClickSuivant"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:id="#+id/Bmoins"
android:onClick="onClickSuivant"
android:layout_toRightOf="#+id/Begale"
android:layout_toEndOf="#+id/Begale" />
</RelativeLayout>
NB : I have no need of the "header" part ... but the last code I found have it and it seems to be exactly I need.... seemed only -__- :(
And I have 2 questions on this design (while i'm asking, I ask everything :p )
1/ How may I force the size of the Image I will be downloading into ImageView1 to a "maximum" height (I mean my picture will be portrait OR landscape... let say 10*15 and 15*10 ... how may i forced them to be 10*6.666 instead of 15*10 <= It's an example... I don't know the image size I will have, but I know I want them at the same height every time, width may change according to the ratio)
2/why Lint is writing this part in red....
android:textAppearance="?android:attr/textAppearanceLarge"
Thx in advance to everyone who stops here and give me hints :)
(and sorry for my english)
EDIT : I have found some answer !! I used RELATIVELayout instead of LINEARLayout, which is recommended to do what I wanted ...
Si here is the "new" template (for reference if anyone is interested), where I still have problem
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:orientation="vertical">
<ScrollView
android:layout_width="match_parent"
android:id="#+id/scroll"
android:layout_height="0dp"
android:layout_weight="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imageView1"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Chargement en cours"
android:id="#+id/TNom"
android:layout_below="#+id/imageView1"
android:layout_centerHorizontal="true" />
</LinearLayout>
</ScrollView>
<LinearLayout
android:id="#+id/footer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:id="#+id/Bplus"
android:onClick="onClickSuivant"
android:layout_toLeftOf="#+id/Begale"
android:layout_toStartOf="#+id/Begale" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="="
android:id="#+id/Begale"
android:onClick="onClickSuivant"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:id="#+id/Bmoins"
android:onClick="onClickSuivant"
android:layout_toRightOf="#+id/Begale"
android:layout_toEndOf="#+id/Begale" />
</LinearLayout>
With the previous design, button were well aligned and take all the screen (match_parent) ... with this one, they are located at the bottom left ... As android:layout_centerHorizontal="true" is made for RelativeLayout, problem come from this... how may i change it ?

Try using android:gravity="center" in your LinearLayout (which encapsulates the buttons) or android:layout_gravity="center" in Button elements. I believe the first option will be enough.
EDIT: regarding Lint warning message, I believe it's related to this line:
android:text="Chargement en cours"
It's discouraged to use hard-coded strings. Try replacing it by android:text="#string/my_string_id" and define such string in your strings.xml file.

How to scale an imageview to the right size? (my png images are to small)

A colleague of mine created for me a few pngs to enter inside a main menu. The pngs are suppose to be scaled to the right size like this:
I entered all the pngs in order to fit the hdpi xhdpi etc.,but when I put the "One player game" and "two player game" the images shrink and do not fit the size of the "Exit" button:
I tried all the variations of "android:scaleType" following this question. Also I tried padding (through a diff question that I can't find now). These resolutions did not help me.
I will be happy if you will be able to show me how to scale up these texts that are inside the png.
Here is my xml code:
<?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="match_parent"
android:layout_height="match_parent"
android:background="#color/colorBackground"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:layoutDirection="ltr"
tools:context="com.inbaltako.tictactoe.MenuActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/logo"
android:paddingTop="50dp"
android:id="#+id/imageView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:id="#+id/relativeLayout">
</RelativeLayout>
<ImageButton
android:id="#+id/exitBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/exit_btn"
android:background="#color/colorPrimary"
android:padding="16dp"
android:onClick="btnClicked"
android:layout_marginTop="2dp"
android:layout_below="#+id/two_player_game"
android:layout_toStartOf="#+id/relativeLayout" />
<ImageButton
android:id="#+id/one_player_game"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/one_player_game"
android:background="#color/colorPrimary"
android:onClick="btnClicked"
android:padding="16dp"
android:layout_below="#+id/relativeLayout"
android:layout_alignStart="#+id/two_player_game" />
<ImageButton
android:id="#+id/two_player_game"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/two_players_game"
android:background="#color/colorPrimary"
android:onClick="btnClicked"
android:padding="16dp"
android:layout_below="#+id/relativeLayout"
android:layout_alignStart="#+id/exitBtn"
android:layout_marginTop="39dp" />
</RelativeLayout>

It's hard to know if you put your drawables I the right places.
But if it's just text, why aren't you using TextView? Should be much easier.
Dealing with images just for text isn't the right thing to do.

Android relativeLayout: How to make button take bottom port of screen?

I was wondering can I create a button that would take the bottom portion of the screen as seen here:
I have tried to play with the alignment and margins, but to no avail:
Another question that I had was why my movie poster is not aligning to the left of the top text properly? As can be seen, it's a bit to the right. I had attempted to drag it into place.
Here is my XML:
<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="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.abushawish.randommovie.MainActivity$PlaceholderFragment" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button1"
android:layout_alignParentTop="true"
android:layout_marginTop="14dp"
android:text="Black Hawk Down"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/textView3"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:src="#drawable/bhd" />
<Button
android:id="#+id/button1"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="New Movie Suggestion"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_marginLeft="-50dp"
android:layout_marginRight="-50dip"
android:layout_marginBottom= "-20dp" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_centerVertical="true"
android:text="Description"
android:layout_marginLeft="1dp" />
Thank you!

Try to remove these.
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
They add padding to the RelativeLayout.

You should start by removing the padding and margins in order to have a simple layout.
When it is ok, you can put back the padding & margins one by one to see which ones are ok or not.

Remove the padding from the buttons parent layout, then your button will align with the edges of the screen.
<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="match_parent"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.abushawish.randommovie.MainActivity$PlaceholderFragment" >
If you still want to have padding for the other objects add them in a separate layout with padding.
Edit
To put the picture in the middle add
android:layout_centerHorizontal="true"

Try android:gravity="bottom" and in the relative layout add android:layout_alignParentBottom="true"

This will give u the intended look.. and yes, don't give weight to children of RelativeLayout
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="New Movie Suggestion" />