Introduction

Ninety percent of people use Android smartphones. I will show you how to create an addition application for Android using Android studio. Android is a kernel based operating system. It allows the user to modify the GUI components and source code.
Requirements
Download link (android studio) https://developer.android.com/studio/

Steps should be followed

Carefully follow my steps on how to create the addition application for android using android studio and I have included the source code below.
Step 1
Open Android studio start the new project.
Android studio
Step 2
Put the application name and company domain. If you wish to use c++ for code the project, Include c++ support then click next.
Android studio
Step 3
Select the android minimum SDK. After you chose the minimum SDK it will show approximate percentage of people who use that sdk then click next.
android minimum SDK
Step 4
Choose the basic activity then click next
Add an Activity to Mobile
Step 5
Put the activity name and layout name. Android studio basically takes the java class name from what you provide as the activity name.
Customize the Activity
Step 6
Goto activity_layout.xml then click the text bottom. Into the activity_layout.xml copy and paste the below code.
activity_layout.xml code
  1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  2. android:id="@+id/relativeLayout1"
  3. android:layout_width="fill_parent"
  4. android:layout_height="fill_parent" >
  6. <LinearLayout
  7. android:id="@+id/linearLayout1"
  8. android:layout_width="wrap_content"
  9. android:layout_height="wrap_content"
  10. android:layout_alignParentLeft="true"
  11. android:layout_alignParentRight="true"
  12. android:layout_alignParentTop="true" >
  14. <TextView
  15. android:layout_width="wrap_content"
  16. android:layout_height="wrap_content"
  17. android:layout_gravity="center"
  18. android:text="ADDITION"
  19. android:textSize="20dp" >
  21. </TextView>
  22. </LinearLayout>
  23. <LinearLayout
  24. android:id="@+id/linearLayout2"
  25. android:layout_width="wrap_content"
  26. android:layout_height="wrap_content"
  27. android:layout_alignParentLeft="true"
  28. android:layout_alignParentRight="true"
  29. android:layout_below="@+id/linearLayout1" >
  30. <TextView
  31. android:layout_width="wrap_content"
  32. android:layout_height="wrap_content"
  33. android:text="ENTER NO 1" >
  34. </TextView>
  35. <EditText
  36. android:layout_width="wrap_content"
  37. android:layout_height="wrap_content"
  38. android:layout_weight="0.20"
  39. android:id="@+id/edittext1"
  40. android:inputType="number">
  41. </EditText>
  42. </LinearLayout>
  43. <LinearLayout
  44. android:id="@+id/linearLayout3"
  45. android:layout_width="wrap_content"
  46. android:layout_height="wrap_content"
  47. android:layout_alignParentLeft="true"
  48. android:layout_alignParentRight="true"
  49. android:layout_below="@+id/linearLayout2" >
  50. <TextView
  51. android:layout_width="wrap_content"
  52. android:layout_height="wrap_content"
  53. android:text="ENTER NO 2" >
  54. </TextView>
  55. <EditText
  56. android:layout_width="wrap_content"
  57. android:layout_height="wrap_content"
  58. android:layout_weight="0.20"
  59. android:id="@+id/edittext2"
  60. android:inputType="number">
  61. </EditText>
  62. </LinearLayout>
  63. <LinearLayout
  64. android:id="@+id/linearLayout4"
  65. android:layout_width="wrap_content"
  66. android:layout_height="wrap_content"
  67. android:layout_alignParentLeft="true"
  68. android:layout_alignParentRight="true"
  69. android:layout_below="@+id/linearLayout3" >
  71. <Button
  72. android:layout_width="wrap_content"
  73. android:id="@+id/button1"
  74. android:layout_height="wrap_content"
  75. android:text="Addition"
  76. android:layout_weight="0.50" />
  78. <Button
  79. android:layout_width="wrap_content"
  80. android:id="@+id/button3"
  81. android:layout_height="wrap_content"
  82. android:text="subtraction"
  83. android:layout_weight="0.50" />
  84. <Button
  85. android:layout_width="wrap_content"
  86. android:id="@+id/button2"
  87. android:layout_height="wrap_content"
  88. android:text="CLEAR"
  89. android:layout_weight="0.50" />
  90. </LinearLayout>
  91. <View
  92. android:layout_height="2px"
  93. android:layout_width="fill_parent"
  94. android:layout_below="@+id/linearLayout4"
  95. android:background="#DDFFDD"/>
  96. </RelativeLayout>
Android studio
Step 7
This is our user interface of the application
Android studio user interface
Step 8
Go to LayoutActivity.java then click the text bottom. Into the LayoutActivity.java copy and paste the below code. Do not replace your package name.
LayoutActivity.java code
  1. package ganeshannt.layout;
  3. import android.app.Activity;
  4. import android.os.Bundle;
  5. import android.view.View;
  6. import android.view.View.OnClickListener;
  7. import android.widget.Button;
  8. import android.widget.EditText;
  9. import android.widget.Toast;
  11. public class LayoutActivity extends Activity {
  12. /** Called when the activity is first created. */
  13. EditText txtData1,txtData2;
  14. float num1,num2,result1,result2;
  15. @Override
  16. public void onCreate(Bundle savedInstanceState)
  17. {
  18. super.onCreate(savedInstanceState);
  19. setContentView(R.layout.activity_layout);
  22. Button add = (Button) findViewById(R.id.button1);
  23. add.setOnClickListener(new OnClickListener()
  24. {
  25. public void onClick(View v)
  26. {
  27. try
  28. {
  29. txtData1 = (EditText) findViewById(R.id.edittext1);
  30. txtData2 = (EditText) findViewById(R.id.edittext2);
  31. num1 = Float.parseFloat(txtData1.getText().toString());
  32. num2 = Float.parseFloat(txtData2.getText().toString());
  33. result1=num1+num2;
  34. Toast.makeText(getBaseContext(),"ANSWER:"+result1,Toast.LENGTH_SHORT).show();
  35. }
  36. catch(Exception e)
  37. {
  38. Toast.makeText(getBaseContext(), e.getMessage(),
  39. Toast.LENGTH_SHORT).show();
  40. }
  41. }
  42. });
  43. Button sub = (Button) findViewById(R.id.button3);
  44. sub.setOnClickListener(new OnClickListener()
  45. {
  47. public void onClick(View v)
  48. {
  49. try
  50. {
  51. txtData1 = (EditText) findViewById(R.id.edittext1);
  52. txtData2 = (EditText) findViewById(R.id.edittext2);
  53. num1 = Float.parseFloat(txtData1.getText().toString());
  54. num2 = Float.parseFloat(txtData2.getText().toString());
  55. result2=num1-num2;
  56. Toast.makeText(getBaseContext(),"ANSWER:"+result2,Toast.LENGTH_SHORT).show();
  57. }
  58. catch(Exception e)
  59. {
  60. Toast.makeText(getBaseContext(), e.getMessage(),
  61. Toast.LENGTH_SHORT).show();
  62. }
  63. }
  64. });
  66. Button clear = (Button) findViewById(R.id.button2);
  67. clear.setOnClickListener(new OnClickListener()
  68. {
  69. public void onClick(View v)
  70. {
  71. try
  72. {
  73. txtData1.setText("");
  74. txtData2.setText("");
  75. }
  76. catch(Exception e)
  77. {
  78. Toast.makeText(getBaseContext(), e.getMessage(),
  79. Toast.LENGTH_SHORT).show();
  80. }
  83. }
  84. });
  86. }
  87. }
Android studio
Step 9
Click the build bottom and make the project. Now your project compilation process is going on. It will show you any error found in your project
Android project build
Step 10
Click run bottom. Your emulator will start then run your application.
Android emulator
Deliverables
Here we have successfully created addition application for android using android studio
Android addition application
Android addition application
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