Passing objects between activities in Android

Question

I have an object Address which has values like: name, address, city, state, zip, phone, etc.

I populate the object with a HTTP call. This variable does get populated. Then I try to pass the object to the next activity by doing so:

Intent intent = new Intent(NewAddressActivity.this, BuildingTypeActivity.class); Bundle b = new Bundle(); b.putParcelable("newAddress", (Parcelable)newAddress); // i had to cast 'newAddress' to 'Parcelable' otherwise, it was giving me an error intent.putExtra("newAddress", b); startActivity(intent);

And in the next activity (BuildingTypeActivity), I fetch the object like so.

Bundle b = this.getIntent().getExtras(); if (b != null) { Address address = b.getParcelable("newAddress"); }

The issue is, that it always crashes when I it gets to the 'putParcelable' line. It might have something to do with the cast to to Parcelable. So, I am assuming that this is not the right way to pass objects?

Any tips on how to pass objects properly would be greatly appreciated.

Your Address Object has to implement Parceble if you want to use putParcelable — pumpkee
– pumpkee, Commented Aug 31, 2013 at 17:19

kayton · Accepted Answer · 2013-08-31 17:54:31Z

You'll need to do something like this:

import android.os.Parcel; import android.os.Parcelable; public class Address implements Parcelable { private String name, address, city, state, phone, zip; @Override public int describeContents() { return 0; } /* THE ORDER YOU READ OBJECT FROM AND WRITE OBJECTS TO YOUR PARCEL MUST BE THE SAME */ @Override public void writeToParcel(Parcel parcel, int i) { parcel.writeString(name); parcel.writeString(address); parcel.writeString(city); parcel.writeString(state); parcel.writeString(phone); parcel.writeString(zip); } public Address(Parcel p){ name = p.readString(); address = p.readString(); city = p.readString(); state = p.readString(); phone = p.readString(); zip = p.readString(); } // THIS IS ALSO NECESSARY public static final Creator<Address> CREATOR = new Creator<Address>() { @Override public Address createFromParcel(Parcel parcel) { return new Address(parcel); } @Override public Address[] newArray(int i) { return new Address[0]; } }; }

And you now shouldn't have to cast your newAddress instance to Parcelable.

user1707035 · Accepted Answer · 2013-08-31 18:57:43Z

For casting an object to Parcelable, your class for that object should be Parcelable. Hence you need to implement Parcelable interface as suggested above.

Community · Accepted Answer · 2017-05-23 10:28:36Z

0

You can use serializable to get your job done..it is the easiest way... here

edited May 23, 2017 at 10:28

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answered Apr 11, 2014 at 6:04

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Comments

Sandeep Choudhary · Accepted Answer · 2014-12-23 14:08:16Z

EDIT: just realised it's very old post :)

Parcelable is best practice but yeah tedious to write code and maintain it. This site can be a helping hand for this

Parcelabler

Note: I haven't tried the Parcelable created with this, as I didn't face the need, but yeah worth a try

Nabin Bhandari · Accepted Answer · 2015-08-09 17:22:27Z

You can easily pass objects within intents using Serializable interface. For this purpose, the object you are passing should be an instance of class implementing Serializable interface. Here is a simple example to pass an object from one Intent to another. In this example, the object testObject of class TestClass has been passed from MainActivity to NewActivity.

activity_main.xml:

<Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Click Here" android:id="@+id/button" android:layout_centerVertical="true" android:layout_centerHorizontal="true" android:onClick="changeIntent" />

activity_new.xml:

<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceMedium" android:text="Medium Text" android:id="@+id/textView" android:layout_centerVertical="true" android:layout_centerHorizontal="true" />

MainActivity.java:

package com.example.nabin.serializabledemo; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.view.View; public class MainActivity extends ActionBarActivity { TestClass testObject; Intent intent; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); testObject = new TestClass("Name"); } public void changeIntent(View v){ intent = new Intent(MainActivity.this,NewActivity.class); intent.putExtra("sampleObject", testObject); startActivity(intent); } }

TestClass.java:

package com.example.nabin.serializabledemo; import java.io.Serializable; public class TestClass implements Serializable{ String classname; int no = 1; String [] sampleArray = {"Apple", "Banana"}; public TestClass(String name){ classname = name; } }

NewActivity.java:

package com.example.nabin.serializabledemo; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.widget.TextView; public class NewActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_new); Intent i = getIntent(); TestClass tc = (TestClass)i.getSerializableExtra("sampleObject"); String name = tc.classname; int no = tc.no; String [] array = tc.sampleArray; TextView textView = (TextView) findViewById(R.id.textView); textView.setText("Name: "+name+"\nno: "+no+"\nArray: "+ array[0]+" " + array[1]); } }

Hope this example will help you.

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