Pass array of custom objects to another Activity in android

Question

I am new to android programming, and I am trying to send an array of custom objects to a different activity. In the first activity I have a function that creates an intent and adds the array of objects to it:

public void openSchedule() {
    Intent nextScreen = new Intent(getApplicationContext(), Schedule.class);
    nextScreen.putExtra("array", tasks);
    startActivity(nextScreen);
}

However, I'm not sure how to get that data at the next screen.

Is there any way to get that array in the code for the next activity even though "tasks" is an array of custom objects?

see this link stackoverflow.com/questions/10107442/…

N J
– N J

2015-07-24 14:29:53 +00:00
Commented Jul 24, 2015 at 14:29 — N J
– N J, Commented Jul 24, 2015 at 14:29

azurh · Accepted Answer · 2015-07-24 15:01:48Z

6

Did you try it with Gson?

public void openSchedule() {
    Intent nextScreen = new Intent(getApplicationContext(), Schedule.class);
    String arrayAsString = new Gson().toJson(tasks);
    nextScreen.putExtra("array", arrayAsString);
    startActivity(nextScreen);
}

In your second activity, parse the extra data back into the List<T>

public void parseBack(){
    String arrayAsString = getIntent().getExtras().getString("array");
    List<YourType> list = Arrays.asList(new Gson().fromJson(arrayAsString, YourType[].class));
}

answered Jul 24, 2015 at 15:01

azurh

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6 Comments

Samir Bhatt Over a year ago

Perfect solution.

DarkCygnus Over a year ago

Lol, almost forgot abut this one. The sad thing is that I even use Gson in other part of my app to save my object array in shared preferences :/ +1 'cause you reminded me of this

Vasko Vasilev Over a year ago

This worked for me. But I need to store the object in an array list not a regular list. How do I need to edit this piece of code to do so?

azurh Over a year ago

@VaskoVasilev just remove the Arrays.asList and you'll get an array.

Vasko Vasilev Over a year ago

It still gives the incompatible types error. The value returned is: 'com.example.pogolemotoproektce.Classes.Book[]'

|

2Dee · Accepted Answer · 2015-07-24 14:28:21Z

1

Have your custom object implement Parcelable, in order to make use of putParcelableArrayListExtra from the Intent class.

answered Jul 24, 2015 at 14:28

2Dee

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Comments

Community · Accepted Answer · 2017-05-23 10:28:26Z

0

You didn't search a lot...

Check this for Parcelable interface : How to send an object from one Android Activity to another using Intents?

edit : This too, https://guides.codepath.com/android/Using-Parcelable

edited May 23, 2017 at 10:28

CommunityBot

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answered Jul 24, 2015 at 14:26

Will Bobo

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