1. CMPE419 Mobile Application Development
Asst.Prof.Dr.Ahmet Ünveren
SPRING
Computer Engineering Department
CMPE419 AU

2. Passing data between activities in Android

3. Code for passing data between activities in Android :
MainActivity.java
String value = "Hello!";
Intent in = new Intent(this,MainActivity2.class);
in.putExtra("Key", value);
startActivity(in);
MainActivity2.java
Bundle bundle = getIntent().getExtras();
String valueReceived = bundle .getString("Key");

5. Code for passing multiple data or values between activities in Android :
Method 1: Using Intent to pass data and Bundle to extract data between activities in Android
MainActivity.java:
String value1 = "Hello!";
String value2 = "Hi!";
Intent in = new Intent(this,MainActivity2.class);
in.putExtra("Key1", value1);
in.putExtra("Key2", value2);
startActivity(in);
MainActivity2.java:
Bundle bundle = getIntent().getExtras();
String valueReceived1 = bundle .getString("Key1");
String valueReceived2 = bundle .getString("Key2");

7. Method 2 : Using Bundle to pass and to extract data between activities in Android
MainActivity.java
String value1 = "Hello!";
String value2 = "Hi!";
Intent in = new Intent(this,MainActivity2.class);
Bundle bundle = new Bundle();
bundle.putString("Key1", value1);
bundle.putString("Key2", value2);
in.putExtras(bundle);
startActivity(in);
MainActivity2.java
Bundle bundle = getIntent().getExtras();
String valueReceived1 = bundle .getString("Key1");
String valueReceived2 = bundle .getString("Key2");  

8. Code for passing array between activities in Android :
MainActivity.java
String[] array = new String[]{"Item1", "Item2", "item3", "Item4", "item5"};
Intent in = new Intent(this,MainActivity2.class);
Bundle bundle = new Bundle();
bundle.putStringArray("MyArray", array);
in.putExtras(bundle);
startActivity(in);
MainActivity2.java
Bundle bundle = getIntent().getExtras();
String arrayReceived[] = bundle.getStringArray("MyArray");

9. Code for passing ArrayList between activities in Android :
MainActivity.java
ArrayList<String> array = new ArrayList<String>();
array.add("Hello");
array.add("Hi");
array.add("Bye");
Intent intent = new Intent(this, MainActivity2.class);
intent.putExtra("array_list", array);
startActivity(intent);
MainActivity2.java
Bundle bundle = getIntent().getExtras();
ArrayList<String> array = (ArrayList<String>)bundle.getStringArrayList("array_list");

10. Code for passing ArrayList <object> between activities in Android :
MainActivity.java
ArrayList<Student> stulist=new ArrayList<Student>();
//add students to your list
Intent i=new Intent(MainActivity.this,NewActivity.class);
Bundle bundle=new Bundle();
bundle.putSerializable("students",stulist);
i.putExtras(bundle);
startActivity(i);

11. NewActivity.java Bundle bundleobje=getIntent().getExtras();
ArrayList stulis=(ArrayList<Student>)
bundleobje.getSerializable("students");

12. public class MainActivity extends Activity {
ArrayList<Student> stulist;
Button Add,Send;
EditText Edtn,Edts,Edtg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
stulist=new ArrayList<Student>();
Init(); }
private void Init() {
Add=(Button)findViewById(R.id.button);
Send=(Button)findViewById(R.id.button2);
Edtn=(EditText)findViewById(R.id.editText);
Edts=(EditText)findViewById(R.id.editText2);
Edtg=(EditText)findViewById(R.id.editText3);
Add.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String Name=Edtn.getText().toString();
Student Stu=new Student(Name,Edts.getText().toString(),Integer.parseInt(Edtg.getText().toString()));
stulist.add(Stu);
Edtg.setText("");
Edtn.setText("");
Edts.setText("");
});
Send.setOnClickListener(new View.OnClickListener() {
Intent i=new Intent(MainActivity.this,NewActivity.class);
Bundle bundle=new Bundle();
bundle.putSerializable("students",stulist);
i.putExtras(bundle);
startActivity(i);
} }

13. NewActivity.Java;
ArrayList<Student> stulis;
ArrayAdapter adapter;
ListView mylist;
String[] liststring;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new);
getstudents(); }
private void getstudents() {
Bundle bundleobje=getIntent().getExtras();
stulis=(ArrayList<Student>) bundleobje.getSerializable("students");
liststring=new String[stulis.size()];
for(int i=0;i<stulis.size();i++)
liststring[i]=stulis.get(i).getName()+" "+stulis.get(i).getSurname()+" "+stulis.get(i).getGrade();
mylist=(ListView)findViewById(R.id.listView);
adapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1,liststring);
mylist.setAdapter(adapter);

14. import java.io.Serializable;
/**
* Created by PC on 09-Apr-18. */
public class Student implements Serializable {
private String Name;
private String Surname;
private int Grade;
Student(String Name, String Surname, int Grade){
this.Name=Name;
this.Surname=Surname;
this.Grade=Grade; }
public String getName() {
return Name;
public int getGrade() {
return Grade;
public String getSurname() {
return Surname;
public void setGrade(int grade) {
Grade = grade;
public void setName(String name) {
Name = name;
public void setSurname(String surname) {
Surname = surname;