Android, Check If Back Button Was Pressed

i have two views and activities. On the first there is a spinner. On the second, you can create new entries (Stored in database for the spinner in activity 1). If the user is fin

Solution 1:

You can override onBackPressed() in the Second Activity. This will get called when the user presses the back button.

You can pass the information as a boolean hasBackPressed = true in the setResult()

Starting Activity 2 from Activity 1:

Intent i = newIntent(this, SecondActivity.class);
startActivityForResult(i, 1);

Passing info back from Activity 2:

@OverridepublicvoidonBackPressed() {
        IntentreturnIntent=newIntent();
        returnIntent.putExtra("hasBackPressed",true);
        setResult(Activity.RESULT_OK,returnIntent);
        finish();
    }

Receiving data in Activity 1:

@OverrideprotectedvoidonActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == 1) {
        if(resultCode == Activity.RESULT_OK){
            booleanhasBackPressed= data.getBooleanExtra("hasBackPressed");
        }
        if (resultCode == Activity.RESULT_CANCELED) {
            //Write your code if there's no result
        }
    }
}

Solution 2:

You can start Activity 2 for result, using startActivityForResult(). On Activity 2 you can set the result to RESULT_OK when new items have been added. Then, in the onActivityResult() method of Activity 1 you can check the returned result and update your data, if needed.

Solution 3:

Override the onBackPressed() method and take the action inside this function.

@OverridepublicvoidonBackPressed() {
    // your stuff heresuper.onBackPressed();
}

Solution 4:

Use startActivityForResult() to start the second activity, and return some value in the onBackPressed() of the second activity. Catch that in onActivityResult(), and refresh the spinner there.

Look into this.