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 http://stackoverflow.com/questions/10107442/android-how-put-parcelable-object-to-intent-and-use-getparcelable-method-of-bu — N J, Jul 24 '15 at 14:29

score 5 · Answer 1 · answered Jul 24 '15 at 15:01

5

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 '15 at 15:01

azurh

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Perfect solution. – Samir Bhatt Jan 23 '18 at 07:04
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 – DarkCygnus May 04 '18 at 22:32
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? – Vasko Vasilev Jul 11 '19 at 13:33
@VaskoVasilev just remove the `Arrays.asList` and you'll get an array. – azurh Jul 11 '19 at 22:04
It still gives the incompatible types error. The value returned is: 'com.example.pogolemotoproektce.Classes.Book[]' – Vasko Vasilev Jul 12 '19 at 07:26
@VaskoVasilev do you mind posting a bit more of code? – azurh Jul 12 '19 at 18:47

score 1 · Answer 2 · answered Jul 24 '15 at 14:28

1

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

answered Jul 24 '15 at 14:28

2Dee

8,609
7
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53

score 0 · Accepted Answer · edited May 23 '17 at 10:28

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 '17 at 10:28

Community

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1

answered Jul 24 '15 at 14:26

Will Bobo

408
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Pass array of custom objects to another Activity in android

3 Answers3