I'm new to android development, and I am making a calculator in android studio. My calculator works fine but there isa problem with its layout I installed it on my tablet and the buttons were very small as I designed them in Android Studio on an emulator, the button size doesn't change, and need help so that the button size increases as the screen size changes.
My calculator design in Android Studio
<?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:background="#ff000000">
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/clear"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="110dp"
android:background="@drawable/clear_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/plus_minus"
android:layout_alignBottom="@+id/clear"
android:layout_toRightOf="@+id/clear"
android:layout_toEndOf="@+id/clear"
android:layout_marginLeft="-11dp"
android:background="@drawable/pm_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/per"
android:layout_alignBottom="@+id/plus_minus"
android:layout_toRightOf="@+id/plus_minus"
android:layout_toEndOf="@+id/plus_minus"
android:layout_marginLeft="-11dp"
android:background="@drawable/per_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/div"
android:layout_alignTop="@+id/per"
android:layout_toRightOf="@+id/per"
android:layout_toEndOf="@+id/per"
android:layout_marginLeft="-11dp"
android:background="@drawable/div_btn"
android:layout_alignParentRight="false" />
<TextView
android:layout_width="fill_parent"
android:layout_height="70dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/disp"
android:layout_above="@+id/plus_minus"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:textColor="@android:color/white"
android:textSize="32sp"
android:inputType="none"
android:textStyle="normal"
android:gravity="right" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/seven"
android:layout_below="@+id/clear"
android:layout_toLeftOf="@+id/plus_minus"
android:layout_toStartOf="@+id/plus_minus"
android:layout_marginTop="-10dp"
android:layout_alignParentTop="false"
android:layout_alignParentLeft="true"
android:background="@drawable/seven_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/eight"
android:layout_alignTop="@+id/seven"
android:layout_alignLeft="@+id/plus_minus"
android:layout_alignStart="@+id/plus_minus"
android:background="@drawable/eight_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/nine"
android:layout_alignBottom="@+id/seven"
android:layout_alignLeft="@+id/per"
android:layout_alignStart="@+id/per"
android:background="@drawable/nine_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/mul"
android:layout_alignTop="@+id/nine"
android:layout_alignLeft="@+id/div"
android:layout_alignStart="@+id/div"
android:background="@drawable/mul_btn" />
<Button
android:layout_width="103dp"
android:layout_height="90dp"
android:id="@+id/four"
android:layout_below="@+id/seven"
android:layout_alignRight="@+id/seven"
android:layout_alignEnd="@+id/seven"
android:layout_marginTop="-10dp"
android:layout_alignParentLeft="false"
android:background="@drawable/four_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/five"
android:layout_alignBottom="@+id/four"
android:layout_alignLeft="@+id/eight"
android:layout_alignStart="@+id/eight"
android:background="@drawable/five_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/six"
android:layout_alignTop="@+id/five"
android:layout_alignLeft="@+id/nine"
android:layout_alignStart="@+id/nine"
android:background="@drawable/six_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/sub"
android:layout_toEndOf="@+id/nine"
android:layout_alignTop="@+id/six"
android:layout_alignLeft="@+id/mul"
android:layout_alignStart="@+id/mul"
android:background="@drawable/min_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/one"
android:layout_below="@+id/four"
android:layout_alignLeft="@+id/four"
android:layout_alignStart="@+id/four"
android:layout_marginTop="-10dp"
android:layout_alignParentLeft="false"
android:background="@drawable/one_btn" />
<Button
android:layout_width="203dp"
android:layout_height="90dp"
android:id="@+id/zero"
android:layout_below="@+id/one"
android:layout_alignLeft="@+id/one"
android:layout_alignStart="@+id/one"
android:layout_marginTop="-10dp"
android:background="@drawable/zero_btn"
android:layout_alignParentLeft="true"
android:layout_marginLeft="-7dp" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/two"
android:layout_above="@+id/zero"
android:layout_alignLeft="@+id/five"
android:layout_alignStart="@+id/five"
android:background="@drawable/two_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/three"
android:layout_below="@+id/five"
android:layout_alignLeft="@+id/six"
android:layout_alignStart="@+id/six"
android:layout_marginTop="-10dp"
android:background="@drawable/three_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/add"
android:layout_toEndOf="@+id/three"
android:layout_below="@+id/six"
android:layout_alignLeft="@+id/sub"
android:layout_alignStart="@+id/sub"
android:layout_marginTop="-10dp"
android:background="@drawable/plus_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/dot"
android:layout_below="@+id/two"
android:layout_alignRight="@+id/three"
android:layout_alignEnd="@+id/three"
android:layout_marginTop="-10dp"
android:background="@drawable/dot_btn" />
<Button
android:layout_width="100dp"
android:layout_height="90dp"
android:id="@+id/equ"
android:layout_toEndOf="@+id/dot"
android:layout_below="@+id/three"
android:layout_alignLeft="@+id/add"
android:layout_alignStart="@+id/add"
android:layout_marginTop="-10dp"
android:background="@drawable/equ_btn" />
</RelativeLayout>
You have to use layout_weight
in order to achieve what you want, and that will be used by wrapping each row of buttons inside a LinearLayout
and all that LinearLayouts
plus the TextView
will be wrapped inside one big LinearLayout
instead of your RelativeLayout
like the following:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff000000"
android:orientation="vertical"
android:weightSum="6" >
<TextView
android:id="@+id/disp"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:inputType="none"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@android:color/white"
android:textSize="32sp"
android:textStyle="normal" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal"
android:weightSum="4" >
<Button
android:id="@+id/clear"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/clear_btn" />
<!-- then the three remaining buttons -->
<LinearLayout />
<!-- then the four remaining rows -->
<!-- in the last row the "0" button will have layout_weight="2" NOT "1" -->
</LinearLayout>
</LinearLayout>
UPDATE:
use ImageButtons instead of Buttons for better scalability, and this is how you must use it:
<ImageButton
android:id="@+id/clear"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@android:color/transparent"
android:src="@drawable/clear_btn"
android:scaleType="fitCenter" />
<!-- and so for all Buttons -->
Note here we changed:
1- layout_height
: from wrap_content
to match_parent
.
2- background
: removing the drawable (clear_btn) and making it transparent
.
and we added:
1- src
: assigning to it the drawable (clear_btn).
2- scaleType
: making it fitCenter
to make it scales in all the available area without ruining the Image scalability ratio.
PS : in case you are want the Button to take all the area weather it is scalable or not, change scaleType
from fitCenter
to fitXY
(may be you will need that for the " 0 " Button).
If you want to support multiple screens never drag and drop and resize views manually.
You can check both the android:layout_weight
attribute and LinearLayout
Solution 1: please use dimens.xml for specifying with and height for buttons.
for tablet,please create folder values-sw600dp,values-sw720dp and put your dimens.xml inside.
Solution 2:
Use linearlayout and layout_weight property.
While setting the height/width of a button in android, using fixed density pixel values will result in exact sizes on all screens. Using width values as wrap_content
, fill_parent
, weights etc. will make the button look according to the screen densities.
Try going through this link once:- Best Practices for User Interface
<android.support.v7.widget.RecyclerView
android:id="@+id/sampleRecyclerView"
android:scrollbars="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button android:id="@+id/sampleButton"
android:width="0dp"
android:height="50dp">
</Button>
</android.support.v7.widget.RecyclerView>
I think the point here is <Button> </Button>
inside a Linear Layout.
android:width="0dp" // This line changes width as of linear layout.
android:height="50dp">
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