How pass data between two android views?

问题

I have a simple application that needs to do the following:

1. From the main view the user clicks a button that launches another view.
2. The new view is displayed and collects information from the user.
3. Once the user clicks OK on that new view I need to "send" that data back to the originating view.

The problem I am finding is that once I use StartActivity (with an intent) or SetContentView (Resource.Layout.Main) is that my data is gone. I'm putting the information I collected in a global variable but when I get back to my originating view its being recreated.

How can I pass this data back to the originating view so that I can update some UI controls?

回答1:

http://developer.android.com/training/basics/intents/result.html

Have you tried startActivityForResult. I'm guessing that is what you're looking to do.

回答2:

Something like this should work:

var activity2 = new Intent (this, typeof(Activity2));
activity2.PutExtra ("MyData", "Data from Activity1");
StartActivity (activity2);

More information about how this works here: http://developer.xamarin.com/recipes/android/fundamentals/activity/pass_data_between_activity/

回答3:

You must call startActivityForResult with the intent and implement the onActivityResult for capture the info that come from Class2.

Activity Class1:

    startActivityForResult(new Intent(this, Class2.class), 1);

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            if(resultCode == RESULT_OK) {
                // do something
   }
            super.onActivityResult(requestCode, resultCode, data);
        }

For send the info to Class1 you must call setResult with the info in your bundle and call finish().

Activity Class2:

    Bundle bundle = new Bundle();
    bundle.putString("---your info---");

    setResult(RESULT_OK, new Intent().putExtras(bundle));
finish(); 

Read the section "Starting Activities and Getting Results" from http://developer.android.com/reference/android/app/Activity.html

来源：https://stackoverflow.com/questions/28464275/how-pass-data-between-two-android-views