Develop Reference

Android, fit an image and textview into the screen

I added a fragment with an ImageView, which is a PNG image, and a TextView just below it.
The fragment is showing fine but when I rotate the screen the image will take most of the screen and the TextView is partially cut.
Here's 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="match_parent">
<ImageView
android:id="#+id/shopping_cart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="#drawable/shopping_cart" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_below="#id/shopping_cart"
android:text="#string/no_data"
android:gravity="center"/>
</RelativeLayout>
I'm trying to find a way to resize the image in order to show both image and text in the screen

try using a scroll-view as the root element if u want to retain the same image size rather than resizing the image. Here's a small snippet -
<ScrollView
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:fillViewport="true">
<RelativeLayout
android:id="#+id/container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
(all your view elements)
</RelativeLayout>

<ScrollView
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">
<LinearLayout
android:id="#+id/text_image_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
(Enter view here)
</LinearLayout>

Alright, so firstly ensure that you have the image for the ImageView in all densities. I would suggest that you use this attribute in your ImageView code:
https://developer.android.com/reference/android/widget/ImageView.ScaleType.html
The scale type defines how your image should scale according to the view. I faced a similar issue once, and i was able to solve it using this. Having said that, i have not seen the image you are using, so i cannot be very sure of it. But, i would say that you use:
android:scaleType="centerCrop"
you can find the definition of the attribute on the link provided above. Also, i do not know what devices you are targeting for your app, but its always good to keep views inside a scroll view so that they are visible even on a smaller screen.
Give it a try, if not by centerCrop, then maybe by some other attribute.
Cheers!!

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="match_parent"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/shopping_text"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="#string/no_data"/>
<ImageView
android:id="#+id/shopping_cart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#id/shopping_text"
android:src="#drawable/shopping_cart"/>
</RelativeLayout>

Android layout not consistent across devices instead of using dp

Screenshot of first image
Screenshot of other phoneI have a LinearLayout ,RelativeLayout,LinearLayout and a ImageView in it.This is basically a landing page of my app,inspite of using the dp my output is not same on the all device. There is the screenshot of two different phones. Thanks in advance
<LinearLayout
android:id="#+id/lb_LinearLayout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:id="#+id/lb_Relative_HomeScreen"
android:layout_width="match_parent"
android:layout_height="450dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="350dp">
`` <ImageView
android:id="#+id/lb_Background_Image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY" />
</LinearLayout>
<TextView
android:id="#+id/lb_Welcome"
android:text="#string/welcome"
android:gravity="start"
style="#style/Heading2.yellow"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_gravity="start|center_vertical"
android:layout_above="#+id/lb_Descrption"
android:layout_marginLeft="20dp"
/>
...
</RelativeLayout>
</LinearLayout>

You need to create different layout files for the major screen density buckets and screen sizes. This way you will be able to fine tune your layout to look consistent across multiple displays.
You can easily create a new layout for a specific bucket from the preview window:
Click on this icon in the left corner.
Then select Create Other....
A popup window will appear then select from the Available Qualifiers the size item for the different screen sizes of Density for the different density buckets.
After you selected the desired item press the >> key, and you can select the appropriate bucket for witch you wish to create a new layout file.
After this you press ok and the android studio creates for you a copy of the current layout and places it in the appropriate folder for you, all that you need to do is to edit it so that it look the way you want it to look on the specific layout.

You should use ScrollView like this :
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="#+id/lb_LinearLayout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:id="#+id/lb_Relative_HomeScreen"
android:layout_width="match_parent"
android:layout_height="450dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="350dp">
`` <ImageView
android:id="#+id/lb_Background_Image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY" />
</LinearLayout>
<TextView
android:id="#+id/lb_Welcome"
android:text="#string/welcome"
android:gravity="start"
style="#style/Heading2.yellow"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_gravity="start|center_vertical"
android:layout_above="#+id/lb_Descrption"
android:layout_marginLeft="20dp"
/>
...
</RelativeLayout>
</LinearLayout>
And to be more compatible with all the devices, try to use "wrap_content" or "match_parent" for height and width. If images are making you to declare dp in your code, then please go through this link :
https://developer.android.com/guide/practices/screens_support.html

Aligning a image button with a background android

I am pretty new to android programming and i was hoping you could help me out with something. I have set a background in an xml file and i am trying to align a image button to a specific area of my background. I have tried using density pixels however it is not precise enough and the button now covers an area of the background i would like to be visible. Any ideas on how i could fix this?
Many thanks,
Alex
My code is as follows:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#drawable/home_background">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="93dp" >
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="341dp" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageButton
android:id="#+id/imageButton1"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="30dp"
android:background="#null"
android:scaleType="fitXY"
android:src="#drawable/workbench" />
</LinearLayout>
</ScrollView>
</LinearLayout>
</LinearLayout>

You can always try using px instead of dp, however the whole point of dp is that they will scale automatically for any screen. If you use px I suspect that it will only work well on the current screen resolution that you're testing on. You would have to define px values for numerous screen resolutions/densities to ensure that your app displayed correctly across different devices.

DensityPixel doesn't seem to work with ImageButton

For a game I have six buttons which look good on mdpi. The 4 left buttons are 100x100px:
If I switch to hdpi, it looks like this:
The xml looks like this (I omitted all but one button to keep it simple):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gameContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1.0"
android:orientation="vertical" >
<com.mydomain.mygame.game.GameSurface
android:id="#+id/gameSurface"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background_game" >
</com.mydomain.mygame.game.GameSurface>
<RelativeLayout
android:id="#+id/controlButtonContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageButton
android:id="#+id/button_left"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentBottom="true"
android:layout_marginBottom="100dp"
android:contentDescription="#string/button_left"
android:background="#drawable/control_button" />
</RelativeLayout>
</FrameLayout>
<LinearLayout
android:id="#+id/emptyBar"
android:layout_width="match_parent"
android:layout_height="40dp"
android:baselineAligned="false"
android:gravity="center"
android:orientation="horizontal" >
</LinearLayout>
</LinearLayout>
These attempts didn't work:
I tried to use 100dp instead of wrap_content. I tried src instead of background as well as I tried different scaleType attributes.
Probably I could calculate the scaling factor in code, but I can't imagine that this is the proper way to do that. Why does it not scaled automatically, because what are dp then for? So how can I configure the right ratio in xml?

Please avoid use of specific size like 100dp . Try to use WRAP_CONTENT or MATCH_PARENT . and for different different screen sizes please use drawable-folders like drawable-hdpi and drawable-mdpi etc . And Put corrosponding images of android:background="#drawable/control_button" in all its specific folders .
Refer these linkes for multiple screen sizes :
http://developer.android.com/guide/practices/screens_support.html
http://developer.android.com/training/multiscreen/screensizes.html

Fixing UI compatible for All type of screen in Single Layout

I want to make header placed adjacent to its background. I need to make the view compatible to all the screens without using fixed pixel value.
Help me to Solve this issue.

You can divide your screen in two parts by giving weight.
How..?
This is the xml code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="6">
<LinearLayout
android:id="#+id/headerlayout"
android:layout_weight="1"
android:layout_height="0dp"
android:layout_width="fill_parent"
android:background="#ffff00"></LinearLayout>
<LinearLayout
android:id="#+id/baselayout"
android:layout_weight="5"
android:layout_height="0dp"
android:layout_width="fill_parent"
android:background="#android:color/darker_gray"></LinearLayout>
</LinearLayout>
There you will notice one layout which is of yellow color can act as header in your code. It will act same for all device. you can increase and decrease the weight of layout as your requirment, as how the header you want.