如果活动是从另一个活动开始的，则启动方法

Question

Hi!

I'm about to ask a really dumb question, but i assure you that i've searched the web and either there is no answer (highly unlikely) or i've come across a solution but have been unable to recognize it.

Anyway, here it is: Let's say i have 2 activities, A and B. Activity B is my applications launcher activity, so when I start my app, the activity B is first run. From there, i'm going to start activity A via an intent. Now, I'm in activity A and starting activity B again via an intent. Now, having started activity B via an intent from the activity A, i want to run the method showStuff() that's inside activity B. How?

Sorry for the weird story, i'm unfortunately unable to express myself in techincal language. Thank you very much for help!

Answer 1

Pass a boolean flag "showStuff" though the intent when start B

Intent intent = new Intent(this, B.class);
intent.putExtra("showStuff", true);
startActivity(intent);  

And in B in onCreate

Intent intent = getIntent();
if (intent != null) {
    boolean showStuff = intent.getBooleanExtra("showStuff", false);
    if (showStuff) {
         showStuff();
     }
}  

also in B override onNewIntent

@Override
protected void onNewIntent(Intent intent)
{
    super.onNewIntent(intent);

    if (intent != null) {
        boolean showStuff = intent.getBooleanExtra("showStuff", false);
        if (showStuff) {
             showStuff();
         }
    }  
}