Call Parent Activity method from Child Activity

user_5516979 0
Viewed 3680

I have Activity A that starts Activity B. Let me start by saying that I believe that Activity A can't use "startActivityForResult()" because Activity B can replace himself for another Activity B (this means, starting another activity and finishing himself), and if that happened Activity A wouldn't be expecting a result anymore and that second Activity B couldn't pass Activity A the result.

Activity A has the instance of the Model. Is there anyway I can get access to the Model from Activity B?

android-activity android
3 Answers

I solved this by adding into my MainActivity:

private static MainActivity main;

public static MainActivity getMain() {
    return main;
}

I am aware this is not a good practice.

user_55169790

you should use a layer of persistence, such as:

  • an internal database
  • Shared Preferences
  • a cloud service
  • the filesystem

...to store the state of your model types. this way that state is durable across configuration changes that result in Activity instances being recreated by Android.

user_25394720

In ActivityA You have to implements Serializable and using Intent. Try it.

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Go to Activity B
    Intent gotoActivityB = new Intent(this, ActivityB.class);
    gotoActivityB.putExtra("ACTIVITY_A", this);
    startActivity(gotoActivityB);
}

In Activity B You can get Activity A from Intent

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_b);

    // get Activity A
    if (getIntent() != null){
        AcitivityA acitivityA = (AcitivityA) getIntent().getSerializableExtra("ACTIVITY_A");
    }
}

Sorry for my bad english :(

user_82565430
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