从对象开始活动

Question

The usual way to start an activity is

Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);

Is there a way to start an Activity from an Object?.. like

SecondActivity var = new SecondActivity();
var.start();

Something like that..?!

Answer 1

Simply pass the Context to your CustomObject and start the Activity using it:

public class CustomObject {

    Context c;
    // and some other fields here...

    public CustomObject(Context c) {
        this.c = c;
    }

    public void startActivity() {

        Intent intent = new Intent(c, SecondActivity.class);
        c.startActivity(intent);
    }

    // and some other methods here...
}

And inside your Activity that creates the Object:

CustomObject obj = new CustomObject(this);
obj.startActivity();

Answer 2

I think you might have this backwards. It sounds like you should send a reference to an object containing your preference data from one from one Activity to another. You can do this using the setXxxExtra() methods in the Intent class.

To send data back from the second Activity to the first Activity, you should first start the second Activity using startActivityForResult() and then override onActivityResult() in your main Activity. The Android developer pages have a very good example about how to do this .