I'm new to Android development and I'm trying to achieve a layout for my app that is capable of handling different screen resolutions/ratios.
I've been reading a lot of the documentation and questions on this site to try to understand the basics and concepts.
First I went through:
developer.android.com/guide/practices/screens_support.html
And questions like:
stackoverflow.com/questions/6403619/how-to-support-all-the-different-resolutions-of-android-products
I've got a pretty basic idea on how to handle things out. But still, its pretty difficult for a starter to get going, and I found myself stucked trying to achieve the solution I came up with.
I designed my app to a target resolution of 480x800, and set it up to always show in portrait mode.
This is how it looks like and how I understand it should work (I used Waldo for the sake of example haha):
(sorry for the link, I need 10 rep to post images)
http://i.imgur.com/KXTAXir.jpg
My root Layout is a LinearLayout, wich contains 3 other Layouts being A and C set up to a weight of 0.8 while B is at 8.4. This is all fine, but the contents of B are set up to DP units at the moment just to be able to test.
B consists of a frame Layout who has 3 other Layouts inside, where 2 of them are working fine, and shown only when needed. The problem is that I need B to be able to adapt based on the contents of it first child: a LinearLayout wich contains 2 ImageView and 1 ProgressBar. I need that those ImageView always keep their ratio.
Here is an example of how it should work:
http://i.imgur.com/cH7fUze.jpg
Imagine those 4 are real screens, wich vary in ratio and size. So my app should only adapt B (from my first image) to keep the images original ratio.
Here is the layout code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/darkgray"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.8"
android:background="#666666" >
<TextView
android:id="#+id/level_text_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="LEVEL"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="#+id/level_text_score"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="SCORE"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/level_text_clock"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="01:59"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="8.4" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="200dp"
android:adjustViewBounds="true" />
<ProgressBar
android:id="#+id/progressBar1"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="1000"
android:progress="0" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="match_parent"
android:layout_height="200dp"
android:adjustViewBounds="true" />
</LinearLayout>
<RelativeLayout
android:id="#+id/pauseMask"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:visibility="gone" >
</RelativeLayout>
<RelativeLayout
android:id="#+id/gameoverMask"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
android:visibility="gone" >
</RelativeLayout>
</FrameLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.8"
android:background="#666666" >
<TextView
android:id="#+id/level_text_status"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="0/0"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="Button"
android:onClick="useHint" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/button1"
android:layout_centerVertical="true"
android:text="Button"
android:onClick="toggleSound" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/button2"
android:layout_centerVertical="true"
android:text="Button"
android:onClick="togglePause" />
</RelativeLayout>
The last thing that stays unclear to me is how to handle the text and button sizes. Should I set them in DPs? How do I get them to scale accordingly like it can be seen on the bottom of my second picture.
Thank you for your help, I also want this to serve as an example to others that are having trouble to understand how to handle this kind of scenarios.
I'm not sure, if I got your question right.
However, you can specify different layouts for different screen sizes and orientations, as described here: http://developer.android.com/guide/practices/screens_support.html
Just give the respective suffix in the name of your layout XML file.
I ended up creating a custom View for my images. The view calculates the space thats left on its parent, scales the images manually and then resizes itself to the same size of the resulting image.
To resize the progress bar to have the same width as the images, I used a custom listener that gets triggered when my custom views get resized. Then I resize the progressbar to match their width.
With this I achieved what I wanted, a layout that will work perfectly in all screen sizes.
Related
First the title may look senseless but I don't know how I describe my problem well in the title.
I have a Relative layout which has 2 buttons (Past games and Upcoming Games) and 2 listviews. Whenever a button is pressed the associated listview is collapsed (height will be zero) if it is already expanded or the reverse will happen. ( i used this solution)
Problem:
Everything is fine when I run it on a 5-inch screen phone. Please see the following picture:
[![][2]][2]
But if I run it on a 10-inch tablet it looks like this:
[![][3]][3]
The same will happen when it will run on less than 5-inch phone.
My questions
Do I need to make another layout for the tablet? like in the layout-large folder?
or I can use some event(s) in Jave file that dynamically set the buttons align parent bottom property when the listview is not collapsed.
or it can be fixed in my current XML
Below is the code for that part I am asking for help
<LinearLayout
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_marginTop="10dp"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/btnPastGames"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_centerHorizontal="true"
android:layout_marginLeft="15dp"
android:layout_marginStart="15dp"
android:background="#color/YellowColor"
android:text="Past Games"
android:textAllCaps="false"
android:textSize="15sp" />
<ListView
android:id="#+id/lvPastGames"
android:layout_width="match_parent"
android:layout_height="255dp"
android:layout_below="#+id/btnPastGames"
android:layout_centerHorizontal="true"
android:layout_marginLeft="17dp"
android:layout_marginStart="17dp"
android:layout_marginTop="5dp"
android:divider="#null" />
<Button
android:id="#+id/btnUpcommigGames"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_below="#+id/lvPastGames"
android:layout_centerHorizontal="true"
android:layout_marginLeft="15dp"
android:layout_marginStart="15dp"
android:background="#color/YellowColor"
android:text="Up Coming Games"
android:textAllCaps="false"
android:textSize="15sp" />
<ListView
android:id="#+id/lvUpcomingGames"
android:layout_width="match_parent"
android:layout_height="255dp"
android:layout_below="#+id/btnUpcommigGames"
android:layout_centerHorizontal="true"
android:layout_marginLeft="17dp"
android:layout_marginStart="17dp"
android:divider="#null" />
</RelativeLayout>
</LinearLayout>
If you guys can give me some advice on making the user interface that will run on all screen sizes and densities I will be very thankful
Thanks to anyone who will help me
You are trying to workaround functionality of ExpandableListView. Look at the following page:
http://www.androidhive.info/2013/07/android-expandable-list-view-tutorial/
I am develop xml with some image button,image buttons show properly in emulator but it Disorganization on
devices(for example galaxy fit)
As described in emulator https://www.dropbox.com/s/qeecp868ht61sck/emulator.jpg and galaxy fit https://www.dropbox.com/s/23r9tvtp0tcn7bs/fit.jpg
what change imagebutton Proportional to size device?
what can i do?
this 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"
tools:context=".Main"
android:background="#drawable/backmain" >
<ImageButton
android:id="#+id/btnfehrest"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="53dp"
android:background="#null"
android:src="#drawable/fehrest" />
<ImageButton
android:id="#+id/btndarbareh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/btnfehrest"
android:layout_marginLeft="21dp"
android:background="#null"
android:src="#drawable/darbareh" />
<ImageButton
android:id="#+id/btnmahsulat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/btndarbareh"
android:layout_marginRight="17dp"
android:background="#null"
android:src="#drawable/mahsulat" />
<ImageButton
android:id="#+id/btnkhoruj"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/btndarbareh"
android:layout_centerHorizontal="true"
android:background="#null"
android:src="#drawable/khoruj" />
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/main"
android:scaleType="fitXY" />
</FrameLayout>
</RelativeLayout>
It is all because you are using Relative Layout in your xml
Relative layout always maintains a relationship with other views in your xml either with Parent view or with child views.
so on small screen your FrameLayout with button image trying to fit in the screen as it maintaining the relationship with other views, that's why its overlaping.
Talking about giving the suggestion regarding this.
1) You can use Linear Layout with scroll view, ie if views gets out of screen you can see them by scrolling down.
//If you don't wanna do this
2) You can create another xml in layout-small with same name.
Example:
res> layout> main.xml
and
res> layout-small> main.xml
Second option will help you in creating multi support for different screen sizes.
Note: By Default layout-small folder is not present but you can create it.
I've got an activity layout specified in an XML file - activity_intro.xml - and I'm trying to create another one that is similar but slightly different - that's going to be activity_instructions.xml.
The Intro activity has a 9patch image at the bottom of the screen that is supposed to stay there and only adjust to different widths of the screens.
The Instructions activity is supposed to contain the same image but above 2 more buttons - all three of these views need to be always located at the bottom of the screen.
activity_intro.xml:
<?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" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:background="#drawable/home_background" >
<LinearLayout
style="#style/Activity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView
android:id="#+id/introAnimationImageView"
android:layout_width="152dip"
android:layout_height="176dip"
android:layout_gravity="center_horizontal"
android:contentDescription="#string/intro_animation_content_description"
android:src="#drawable/animation_intro01" />
<TextView
android:id="#+id/introTextViewTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/intro_title"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/introTextViewSubtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/intro_subtitle"
android:textAppearance="?android:attr/textAppearanceMedium" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/introButtonLoginSignup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="#string/intro_button_label_login_signup" />
<Button
android:id="#+id/introButtonInstructions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/introButtonLoginSignup"
android:text="#string/intro_button_label_instructions" />
<Button
android:id="#+id/introButtonReportAnonymously"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/introButtonLoginSignup"
android:layout_centerHorizontal="true"
android:text="#string/intro_button_label_report_anonymously" />
</RelativeLayout>
</LinearLayout>
</ScrollView>
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:contentDescription="#null"
android:scaleType="fitXY"
android:src="#drawable/footer_cityscape" />
</LinearLayout>
Result:
Since I've got working code for Intro, I wanted to make Instructions follow its example but the layout_weight property isn't behaving as expected. First of all, I was only trying to put in the 2 buttons and leave out the image:
<?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" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="0.1"
android:background="#drawable/home_background" >
<LinearLayout
style="#style/Activity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/instructionsTextViewTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/instructions_title_1"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textStyle="bold" />
<ImageView
android:id="#+id/instructionsImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/instructions_image_content_description"
android:src="#drawable/forms" />
<TextView
android:id="#+id/instructionsTextViewDescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/instructions_description_1"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
</ScrollView>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
<Button
android:id="#+id/instructionsButtonPrevious"
style="#style/ButtonPrevious"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="#string/instructions_button_label_previous" />
<Button
android:id="#+id/instructionsButtonNext"
style="#style/ButtonNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="#string/instructions_button_label_next" />
</RelativeLayout>
</LinearLayout>
This only worked when I set the layout_weight of the bottom RelativeLayout to 1 (instead of 0) and for the ScrollView 0.1 (instead of 1). If I used the original values the RelativeLayout would take up all the screen. Could anyone explain to me why that is?
I also tried googling the issue and noticed people would suggest to set layout_height to 0dip which I tried but it also didn't work as expected.
Secondly, I tried adding the already mentioned ImageView to the bottom RelativeLayout. This, however, basically displays only the ImageView and not the buttons - or one of the buttons is on top of the image (hiding it). Why is that? Don't I specifically set the buttons to be placed below it?
What should the code look like in order for it to be doing what I expect it?
Further explanation:
Below are images that should help indicate what exactly I want to achieve. The green bits are the ScrollViews - I added them because Android devices tend to have diverse screen sizes. Their purpose is to present the content properly independently of the screen size, i.e. if the screen is small, the user will be able to scroll that part to read the entire text and view the image.
The red bit on the left (Intro) shows the ImageView that is supposed to always be at the bottom of the screen; it'll always be there, visible, and it's the green bit above it that will be movable.
If you take a look at the red bit on the right (Instructions), there's a Next button that's covering the image with the lorry/truck that was visible in the Intro screenshot. Now that's wrong - there should be 2 buttons BELOW the image, as seen on the last screenshot (the 2 blue rectangles).
I'm having a little trouble laying out my android app. I didn't plan it out very well, and i'm not new to java, but im new to these android xml layouts. What i have is a horizontal linear layout parent, which contains two relative layouts. The right relative layout consists of a custom view (GridView) and under it i want 3 buttons. I've added one button (button1) to my xml file and it won't show up on screen as you can see. I'm thinking i need to set the size of my gridview some how? Its height is 2x its width. Or can i set it by pixels programatically at runtime?
I'm also thinking i sort of over complicated things at this point. Like i said i'm new to these weird layouts, im used to just using x and y offsets in .net. Maybe this could all be done in one relative layout instead of using two and nesting them inside a linear layout?
Here's what i got so far:
<?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="horizontal" >
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="#string/next" />
<com.mydomain.tetrisv2.PreviewGridView
android:id="#+id/previewGridView1"
android:layout_width="100dp"
android:layout_height="150dp"
android:layout_alignParentLeft="true"
android:layout_below="#+id/textView1" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/previewGridView1"
android:text="Score: " />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent" >
<com.mydomain.tetrisv2.GridView
android:id="#+id/gridView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="50dp" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/gridView1"
android:text="Button" />
</RelativeLayout>
</LinearLayout>
I can't post images but heres the visual result: http://i50.tinypic.com/orscgi.png
Also side note (unrelated), this is a project for experimentation and learning purposes but are there any legal copyright repercussions to making a tetris game and putting it on the play store?
Just change our right sides gridview's below button to this code
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" // change is here
android:text="Button" />
Hope this will help you..
Summary: I want a horizontal row of ImageButtons to scale down evenly to fit in the screen size.
I have a row of ImageButtons at the top of the screen. A left-aligned logo ImageButton and then right-aligned ImageButtons for various actions.
Yes, that does sound a lot like a Honeycomb/ICS Action Bar, but the code is targeted for Froyo, so I need to implement the design in 2.2-compatible layouts.
I programmatically detect when I'm on a 7" screen or larger and switch to larger images for the ImageButtons (as the drawable-xlarge directory only works for 10" and up, and drawable-large works for 4" and up).
This works great on a phone or on a 10" tablet. However, on a 7" tablet, the images are too large for the space in portrait mode (the app is locked to portrait mode).
I have tried many different approaches to making the images scale down, as I'd rather not use yet another set of images just for 7" tablets. But the images are not spaced properly, or scale at different levels, or only some of the images appear on the screen. I've used RelativeLayout, LinearLayout, android:weightSum, setting the images as background images, as src images, etc.
EDIT: Another quirk I noticed in my experimentation was that if I set the same layout_weight, the layout worked, forcing each item to have the same width. If I want some items to have different widths--which is necessary in this case, as the first button needs to be substantially wider--then the layout breaks when I set a layout_weight that doesn't match the others. Only one or two of the items appear on screen, the rest presumable being pushed off.
Here's the layout I'm using. This is my best so far--it works great on 10" tablets and phones, and is almost tolerable on 7" tablets. But the logo--which should be the same height as the buttons and about 2.5 times wider--is noticeably taller than the other buttons. Any suggestions on improving the layout?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/actionBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:padding="5dip"
android:gravity="center_vertical"
android:orientation="horizontal"
android:background="#drawable/action_bar_bg"
>
<ImageButton
android:id="#+id/logoButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#null"
android:src="#drawable/save_logo_03"
android:padding="2dip"
android:adjustViewBounds="true"
android:scaleType="centerInside"
/>
<View
android:id="#+id/spacer"
android:layout_width="50dip"
android:layout_height="1dip"
android:layout_weight="1"
android:visibility="invisible"
/>
<ImageButton
android:id="#+id/listButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/list_button"
android:background="#null"
android:adjustViewBounds="true"
android:padding="2dip"
android:scaleType="centerInside"
/>
<ImageButton
android:id="#+id/mapButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#null"
android:src="#drawable/map_button2"
android:adjustViewBounds="true"
android:padding="2dip"
android:scaleType="centerInside"
/>
<ImageButton
android:id="#+id/ltoButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#null"
android:src="#drawable/lto_button"
android:adjustViewBounds="true"
android:padding="2dip"
android:scaleType="centerInside"
/>
<ImageButton
android:id="#+id/searchButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#null"
android:src="#drawable/search_button"
android:adjustViewBounds="true"
android:padding="2dip"
android:scaleType="centerInside"
/>
</LinearLayout>
Unfortunately, in the end I did have to programmatically change the button sizes depending on the size of the screen.
My final layout looked like this (sanitized):
<?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="wrap_content"
android:layout_weight="0"
android:padding="5dip"
android:gravity="center_vertical"
android:orientation="horizontal"
android:background="#drawable/action_bar_bg"
>
<ImageButton
android:id="#+id/logoButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:background="#null"
android:padding="2dip"
android:adjustViewBounds="true"
android:src="#drawable/logo"
android:scaleType="centerInside"
/>
<View
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="1"/>
<ImageButton
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:background="#null"
android:padding="2dip"
android:src="#drawable/button1"
android:scaleType="centerInside"
android:adjustViewBounds="true"
/>
<ImageButton
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:background="#null"
android:padding="2dip"
android:src="#drawable/button2"
android:scaleType="centerInside"
android:adjustViewBounds="true"
/>
<ImageButton
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:background="#null"
android:padding="2dip"
android:src="#drawable/button3"
android:scaleType="centerInside"
android:adjustViewBounds="true"
/>
<ImageButton
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:background="#null"
android:padding="2dip"
android:src="#drawable/button4"
android:adjustViewBounds="true"
android:scaleType="centerInside"
/>
</LinearLayout>
Notice the empty View that fills up available space, pushing the other buttons over to the right side of the screen.
In the code, I check the screen size. If it seems to be >= 7", then I switch to larger images.
If it seems to be >=7" but < 9", then I programmatically change the size of the images--and that I had to experiment with to come up with just the right number for it to work. If I had more images or they changed, I would have to repeat it. I'm not proud of such an inflexible solution, but I couldn't find anything else that worked.
This is what I've got:
In your specific case, we can say that your app layout and buttons size are under dependecy of:
The mobile device screensize/resolution;
The number of buttons in the
row;
I recommend 2 approaches to you:
Implementing your layout with RelativeLayout and weight tags. Flexible layouts can be made very easy with these ones;
Programatically define your button sizes using DisplayMetrics class, something like the snippet in the end of this post, and use an extra .xml file (say integer.xml) where you can define a constant value for your number of buttons;
In this snippet, dm is a structure that holds your device resolutions.
DisplayMetrics dm = new DisplayMetrics();
context.getWindowManager().getDefaultDisplay().getMetrics(dm);
Hope it helped you! :)