将数据从一类传递到另一类

Question

In class B, I have the following method:

public String sendPlayerDataMethod() {
  String testt = "thissss is for testing";
  /*** 
  Intent sendPlayerData = new Intent(this, FullPlayerList.class);
  sendPlayerData.putExtra(Intent.EXTRA_TEXT, testt);
  startActivity(sendPlayerData);
  ***/
 return testt;
}

In class A, I want to simply call this method. I thought ClassB.sendPlayerDataMethod() would do the trick, but when I'm typing it out IntelliJ doesn't seem to pick it up.

Both classes are public as well...
I want to call that method and then assign the return value to a var in ClassA...

Thanks

Answer 1

Your method is actually correct, there's no problem with it. The most likely reason you're still getting this behaviour is because of the way you are referencing the method (from class A). There are two approaches to solving this problem:

• The first approach (and also the faster one) is to make your sendPlayerDataMethod() static and then referencing it like this in class A:

   ClassB.sendPlayerDataMethod(); 

• The other option is to make it non-static. In this case, you have to create an object of class B before you can use the method. Like this:

   ClassB b = new ClassB(); b.sendPlayerDataMethod(); 

I hope this helps.. Merry coding!

Answer 2

Sounds like you want to pass information from one activity to another activity.

The common way is to create an Intent in class A (like in your commented code) and receive the intent by accessing the information about onCreate() method from savedInstance in class B.

Don't code such dirty tricks like static attributes and stuff. Follow the Activity Lifecycle .

public class ActivityA extends Activity {
    ...
    public void sendPlayerDataMethod() {
        String test = "thissss is for testing";
        Intent sendPlayerData = new Intent(this, ActivityB.class);
        sendPlayerData.putExtra(Intent.EXTRA_TEXT, test);
        startActivity(sendPlayerData);
    }
    ...
}

public class ActivityB extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        String test = savedInstanceState.getString(Intent.EXTRA_TEXT);
        Log.i("MyApp", test); // log your String in LogCat
    }

}

(This code is just developed right here in SO without IDE so no guarantee)

Answer 3

In class A:

• Non-static way:

   B b = new B(); String data = b.sendPlayerDataMethod(); 

• Static way:

   String data = B.sendPlayerDataMethod(); // Set the sendplayerdatamethod to static 

Answer 4

Make sure that the method is static like this:

public static String sendPlayerDataMethod() {
 String testt = "thissss is for testing";
 /*** Intent sendPlayerData = new Intent(this, FullPlayerList.class);
  sendPlayerData.putExtra(Intent.EXTRA_TEXT, testt);
  startActivity(sendPlayerData);***/
 return testt;
}

Then you can call it from class A like this:

classB.sendPlayerDataMethod();