CODEWITHSUNDEEP
androidandroid-intentandroid-fragmentsandroid-activity
Figen Güngör
Figen Güngör

Reputation: 12559

How to pass class object to activity

I have a BarcodeReaderActivity which I'll start in a couple of activities and before I start this Activity, I want to pass a destinationActivity class for this BarcodeReaderActivity so after reading QR code, I want it to open destination Activity with Intent.

My first solution is to pass destination class name as string and use switch case in BarcodeReaderActivity and write specific Intent for that class.

I also tried to create BarcodeReaderas Fragment first but then when I start the destination Activity and then remove the Fragment it shows the previous Activity for a short amount of time but I don't want that to happen.

I would like to get some advice from you, if you know a better approach.

Upvotes: 1

Views: 802

Answers (2)

Okas
Okas

Reputation: 2664

You could build required Intent outside BarcodeReaderActivity and pass it as extra. If needed you can change this intent later in BarcodeReaderActivity. Something like this:

Intent finalIntent = new Intent( context, FinalActivity.class );
Intent barcodeIntent = new Intent( context, BarcodeReaderActivity.class );
barcodeIntent.putExtra( "finalintentkey", finalIntent);
context.startActivity(barcodeIntent);

then in your BarcodeReaderActivity retrieve intent (and modify it as needed):

Intent finalIntent = getIntent().getParcelableExtra( "finalintentkey" );
// if needed modify intent here
finalIntent.addExtra( "somekey", someneededvalue );
startActivity( finalIntent );

// BarcodeReaderActivity can be finished now
finish();

Upvotes: 1

Piotr Wittchen
Piotr Wittchen

Reputation: 3922

You can pass objects between Android Activities. The best way to do it is to implement Parcelable interface from Android SDK. After that, you can add your object to the Intent responsible for starting new Activity with putExtra("parcelName", object) method.To read Parcelable object in antoher activity you can use such code snippet:

getIntent().getExtras().getParcelable("parcelName")

I've found nice example presenting this idea here: http://shri.blog.kraya.co.uk/2010/04/26/android-parcel-data-to-pass-between-activities-using-parcelable-classes/

Moreover, if you want to avoid tons of boilerplate code, you can use auto-parcel library, which can generate some repeatable stuff for you.

Upvotes: 1

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