Android tutorials7 calculator_basiclayout

Sep 17, 2013Download as ODP, PDF0 likes241 views

The document describes setting up the layout for a basic calculator app in Android Studio. It involves dragging buttons to represent arithmetic symbols into the activity_main.xml file and editing the properties of each button such as the text and ID. A TextView is added to display the answer and two EditText fields are added to take numeric input from the user. The layout is further customized using a relative layout and adjusting positioning of the elements.

Very basic
Calculator
layout in
activity_main.
xml file.

Good thing is that layout
can be controlled by drug-
and-drop method. So just
click on “Hello World” and
you can simply delete it.
Then just drug into your app
four buttons (which will later
represent arithmetic
symbols)

Now by clicking on
activity_main.xml tab at
the bottom you will go into
the “code” of the layout.
Each button is represented
by opening and closing tag
<Button … />
And as parameters you can
change it's text, layout_width
and so on...
android:id sets name which
represents button in a java
file.
Now change text and id
parameters for each
button.
Like in the next slide.

Don't worry if your code is a bit
different.
Because of graphical relative
layout android:layout_... might
have different value
<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=".MainActivity" >
<Button
android:id="@+id/minus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/plus"
android:layout_alignBottom="@+id/plus"
android:layout_alignParentRight="true"
android:layout_marginRight="67dp"
android:text="-" />
<Button
android:id="@+id/division"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/plus"
android:layout_below="@+id/plus"
android:layout_marginTop="47dp"
android:text="/" />
<Button
android:id="@+id/mult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/division"
android:layout_alignBottom="@+id/division"
android:layout_alignLeft="@+id/minus"
android:text="*" />
<Button
android:id="@+id/plus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="39dp"
android:text="+" />
</RelativeLayout>

Now change back to
Graphical Layout and
correct layout by drug and
drop if something doesn't
look beautiful enough.

From Form Widgets folder
drug and drop TextView.
(this field will be used to
show the answer)
And from Text Fields drug
and drop Plain Text.
(this will take two numbers
as input)

Now open activity_main.xml
and change id's
appropriately
<TextView
android:id="@+id/answer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/input1"
android:layout_below="@+id/input1"
android:layout_marginLeft="14dp"
android:layout_marginTop="27dp"
android:text="TextView" />
<EditText
android:id="@+id/input1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="22dp"
android:ems="10" >
</EditText>
<EditText
android:id="@+id/input2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/input1"
android:layout_alignParentTop="true"
android:ems="10" />

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1. Very basic Calculator layout in activity_main. xml file.

2. Good thing is that layout can be controlled by drug- and-drop method. So just click on “Hello World” and you can simply delete it. Then just drug into your app four buttons (which will later represent arithmetic symbols)

3. Now by clicking on activity_main.xml tab at the bottom you will go into the “code” of the layout. Each button is represented by opening and closing tag <Button … /> And as parameters you can change it's text, layout_width and so on... android:id sets name which represents button in a java file. Now change text and id parameters for each button. Like in the next slide.

4. Don't worry if your code is a bit different. Because of graphical relative layout android:layout_... might have different value <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=".MainActivity" > <Button android:id="@+id/minus" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/plus" android:layout_alignBottom="@+id/plus" android:layout_alignParentRight="true" android:layout_marginRight="67dp" android:text="-" /> <Button android:id="@+id/division" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/plus" android:layout_below="@+id/plus" android:layout_marginTop="47dp" android:text="/" /> <Button android:id="@+id/mult" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/division" android:layout_alignBottom="@+id/division" android:layout_alignLeft="@+id/minus" android:text="*" /> <Button android:id="@+id/plus" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_centerVertical="true" android:layout_marginLeft="39dp" android:text="+" /> </RelativeLayout>

5. Now change back to Graphical Layout and correct layout by drug and drop if something doesn't look beautiful enough.

6. From Form Widgets folder drug and drop TextView. (this field will be used to show the answer) And from Text Fields drug and drop Plain Text. (this will take two numbers as input)

7. Now open activity_main.xml and change id's appropriately <TextView android:id="@+id/answer" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/input1" android:layout_below="@+id/input1" android:layout_marginLeft="14dp" android:layout_marginTop="27dp" android:text="TextView" /> <EditText android:id="@+id/input1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginTop="22dp" android:ems="10" > </EditText> <EditText android:id="@+id/input2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/input1" android:layout_alignParentTop="true" android:ems="10" />

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