CODEWITHSUNDEEP
androidunity-game-engineback-button
Oli
Oli

Reputation: 1427

How to call previous Android Activity from Unity Activity

My main activity has a button which launches UnityActivity. I need to finish the UnityActivity and return to previous activity. When pressing the back button it closes the whole application.

What can I do? Thank you!

Edit:

I use the AR player from Qualcomm Augmented Reality (Unity Extension). I have only one main activity which I start the AR player from Qualcomm Augmented Reality.

Main Activity

public class Main extends Activity {
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    public void onBtnStartClick(final View v) {
        Intent i= new Intent(this,ArPart.class);
        startActivity(i);
    }
}

AR Player Activity

public class ArPart extends QCARPlayerActivity {
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK)) {
             finish();
        }
        return super.onKeyDown(keyCode, event);
    }
}

Upvotes: 4

Views: 5275

Answers (3)

JakeP
JakeP

Reputation: 1756

I found it easiest to use the overridden onBackPressed() but to do that you also have to make a change in your Unity project:

void Update ()
{
    if (Input.GetKeyUp (KeyCode.Escape)) {

        AndroidJavaClass jc = new AndroidJavaClass ("com.unity3d.player.UnityPlayer"); 
        AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject> ("currentActivity"); 
        jo.Call ("onBackPressed");
    }
}

Then, in your activity class:

@Override
public void onBackPressed() {

    // Handle the activity however you want,
    // what you do here will be executed when the back button is pressed
}

Also, remember that for this to work as expected, the UnityPlayer object cannot be paused - you should pause it after you've handled the back button press event.

Credit goes to @Frank Nguyen from this thread: Can't pass back event from Unity to android library jar.

Upvotes: 4

Android Killer
Android Killer

Reputation: 18509

do something like this as follows:

 Intent i=new Intent(unityActivity.this,mainActivity.class); // the names of activity as per you program.
    startActivity(i);
finish();

Upvotes: 0

Ashwin N Bhanushali
Ashwin N Bhanushali

Reputation: 3882

use the following code

@Override
    public void onBackPressed() {
        // TODO Auto-generated method stub
        //super.onBackPressed();
        finish();
    }

Upvotes: 0

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