Array of Pair<View, String> in Android for transition shared elements [duplicate]

Question

I have activities with enter and exit transitions
Depends on actvity called to start, I have different shared elements
As you know I should use below method as secound parameter when calling startActivity():

ActivityOptions.makeSceneTransitionAnimation(Activity activity, Pair<View, String>... sharedElements);

Because I use my different shared elements several times in code, I want to store my pairs in arrays to use for varags parameter.
By using this:

Pair<View, String>[] pairs = new Pair<View, String>[n];

I get "Generic array creation" error.

I have also tried using Arraylist like this:

ArrayList<Pair<View, String>> p = new ArrayList<>(); p.add(Pair.create(pauseButton, "sharedPauseBtn")); p.add(Pair.create(toggleMusicButton, "sharedMusicBtn")); Pair<View, String>[] pairs = p.toArray(new Pair<View, String>[n]);

And getting same "Generic array creation" error, I think Java doesn't allow it.

Any idea for storing some "Pair<View, String>" in an array as shared elements or another alternative solutions? I have searched all questions about array of generic class object in Java in stackoverflow but they doesn't help.

which line causes the error?

Code-Apprentice
– Code-Apprentice

2021-01-05 16:22:15 +00:00
Commented Jan 5, 2021 at 16:22 — Code-Apprentice
– Code-Apprentice, Commented Jan 5, 2021 at 16:22

Ahmed Maad · Accepted Answer · 2022-03-19 10:33:30Z

To make it using Kotlin syntax without arrays:

val firstTransition = Pair.create<View, String>(view1, "transitionName1") val secondTransition = Pair.create<View, String>(view2, "transitionName2") val options = ActivityOptions.makeSceneTransitionAnimation(this@CurrentActivity, firstTransition, secondTransition) val i = Intent(this@CurrentActivity, TargetActivity::class.java) startActivity(i, options.toBundle())

To make an array of Pair objects in your activity just use the following Java syntax:

Pair[] pairs = new Pair[2]; pairs[0] = Pair.create(view1, "transitionName1"); pairs[1] = Pair.create(view2, "transitionName2"); ActivityOptions options = ActivityOptions.makeSceneTransitionAnimation(this,pairs); Intent i = new Intent(CurrentActivity.this, TargetActivity.class); startActivity(i, options.toBundle());

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