CODEWITHSUNDEEP
androidandroid-intentandroid-activity
yahya
yahya

Reputation: 4860

onActivityResult data transfer

I'm following this tutorial http://www.vogella.com/articles/AndroidIntent/article.html for having some data transfered to parent activity by calling an activity with startActivityForResult.

Basicly i’m trying to finish parent activity, on some buttons clicked but not onBackPressed. I do not know if there is a easier way or not. Like this:

MainPage to NewTarget
            NewTarget to Target

// onBackPressed
            Target to NewTarget

// onButtonClick on TargetActivity
            Target to MainPage

The problem is onActivityResult calls when i click the button on NewTarget activity, not on Target activity finish?? Shouldn’t it be opposite?

On “NewTarget” class, i’ve got a button which needs to call an activity onClick. And i also need some feedBack on activity, named “Target”, like it’s been finished by back button or some other way (which i need to finish that activity on some point click, and i called “finish()”)

From NewTarget activity:

public void savingClick(View v) {
    Intent targetIntent = new Intent(this, Target.class);
    targetIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivityForResult(targetIntent, 5);
}

On Target activity:

@Override
public void finish() {
if(ClickCheck) {
    Log.d("Target","ClickCheck");
    // Prepare data intent 
    Intent data = new Intent();
    data.putExtra("returnKey", "click");
    // Activity finished ok, return the data
    setResult(RESULT_OK, data);
}
super.finish();

}

And finally on NewTarget activity:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d("NewTarget","requestCode: " + requestCode);
    Log.d("NewTarget","resultCode: " + resultCode);
    if(requestCode == 5 && resultCode == RESULT_OK) {
        Log.d("NewTarget","data: " + data.hasExtra("returnKey"));
        if(data.hasExtra("returnKey"))
            this.finish();
    }
    super.onActivityResult(requestCode, resultCode, data);
}

And i check the values:

// these lines have appeared when i clicked on button to startActivityForResult
requestCode: 5
resultCode: 5
// ClickCheck line has appeared on Target activity finished.
// data: data.hasExtra("returnKey")); line has never been appeared.

So what’s the deal? What am i overlooking? Thanks in advance for your helps.

Upvotes: 0

Views: 559

Answers (1)

David Wasser
David Wasser

Reputation: 95626

To do this:

MainPage to NewTarget
        NewTarget to Target

// onBackPressed
        Target to NewTarget

// onButtonClick on TargetActivity
        Target to MainPage

You don't need to use startActivityForResult() unless you need to have some data returned from Target to NewTarget. The normal behaviour will be that pressing "back" in Target will just call finish() on Target and return to NewTarget (that seems to be what you want). To get the last behaviour you should just use the following code in Target.onButtonClick():

Intent intent = new Intent(this, MainPage.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();

This will finish both NewTarget and Target and then it will finish the current MainPage activity and create a new instance of the MainPage activity (if the launchMode of MainPage is "standard").

Try this.

Upvotes: 1

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