Call Android Activity from inside?

Question

Is it possible to call an Activity form inside the Activity class, so I can deliver information over constructor?

something like

public MyClass(){
     startActivity(new Intent(this, this.getClass()));
}

why on earth you want to do that? – Jainendra Oct 06 '15 at 19:56 — Jainendra, Oct 06 '15 at 19:56

score 0 · Answer 1 · answered Oct 06 '15 at 20:05

I'm assuming this is because you want to pass some initialisation data to the activity?

The way to do this is by adding a Bundle to the activity.

    Intent intent = new Intent(YourStartingActivity.this,YourNewActivity.class);
    intent.putExtra("key", "value");
    startActivity(intent);

The in the OnCreate method of your new Activity

Bundle bundle = getIntent().getExtras();
String myString = bundle.getString("key");

Which will get whatever you passed in as your "value" which can be a String, int, float etc....

score 0 · Answer 2 · edited May 23 '17 at 12:29

I think you can't do that. If I understood correctly you want to pass data between two activities, you should always do this via Intent. Take a look on this https://stackoverflow.com/a/2091482/3707606

If you want to pass more complex data you should make the data class implement Parcelable. It may look hard but you can generate your parcelable at http://www.parcelabler.com/ or install this plugin to Android Studio.

Call Android Activity from inside?

2 Answers2