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Passing Parameters Through Intent In Android

Different Ways Of Passing Parameters

1. Using extra attribute
2. Using bundle object
3. Using Parcelable method

Using Extra Attribute

Intent i = new Intent(getApplicationContext(), SecondActivity.class);
i.putExtra(key, value);
startActivity(i);

String str = getIntent().getExtras().getString(key);

Using Bundle Object

Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
Bundle b = new Bundle();
b.putString("name", "karan");
b.putString("country", "india");

intent.putExtra("bundle", b);

startActivity(intent);

Intent intent = getIntent();
Bundle b= intent.getBundleExtra("bundle");
b.getString("name")
b.getString("country")

Using Parcelable Method

1. Create an object that you want to serialize and implement Parcelable class. Here is the implementation

import android.os.Parcel;
import android.os.Parcelable;

public class Person implements Parcelable {
  private String name;

  protected Person(Parcel in ) {
    name = in .readString();
  }

  protected Person() {}

  public void setName(String myName) {
    name = myName;
  }

  public String getName() {
    return name;
  }

  public static final Creator < Person > CREATOR = new Creator < Person > () {
    @Override
    public Person createFromParcel(Parcel in ) {
      return new Person( in );
    }

    @Override
    public Person[] newArray(int size) {
      return new Person[size];
    }
  };

  @Override
  public int describeContents() {
    return hashCode();
  }

  @Override
  public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(name);
  }
}




2. Create an intent object in MainActivity

Intent intent = new Intent(getApplicationContext(), SecondActivity.class);

Person p =new Person();
p.setName("karan");

intent.putExtra("parcel", p);

startActivity(intent);




3. Get the value in second activity

Intent intent = getIntent();
Bundle b= intent.getExtras();

Person p = (Person)b.getParcelable("parcel");

Toast.makeText(SecondActivity.this, p.getName(), Toast.LENGTH_LONG).show();