CODEWITHSUNDEEP
android
caibirdcnb
caibirdcnb

Reputation: 365

In Android where to put the global method?

Below is my code to exit my app.

Since I have more than 1 activity, where should I put exitBy2Click() so it can be use for all activities?

I tried to create a new class called "Global", and public exitBy2Click(), but Toast.makeText(this,... not work.

Thanks. 

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(keyCode == KeyEvent.KEYCODE_BACK) {
        exitBy2Click(); 
    }
    return false;
}

private static Boolean isExit = false;

private void exitBy2Click() {
    Timer tExit = null;
    if (!isExit) {
        isExit = true; 
        Toast.makeText(this, "click again to quit", Toast.LENGTH_SHORT).show();
        tExit = new Timer();
        tExit.schedule(new TimerTask() {
            @Override
            public void run() {
                isExit = false;
            }
        }, 2000);

    } else {
        finish();
        System.exit(0);
    }
}

Upvotes: 0

Views: 109

Answers (2)

GreyBeardedGeek
GreyBeardedGeek

Reputation: 30088

The best place to put this code is literally "nowhere". Forcibly terminating an Android app is not recommended, and calling System.exit is definitely not something you should ever do in an Android app.

Upvotes: 2

guipivoto
guipivoto

Reputation: 18677

Checking your method, I think that best option would be Inheritance..

Note on example below that you can override onBackPressed() instead of onKeyDown()

public class BaseActivity extends Activity {

    private static Boolean isExit = false;

    @Override
    public void onBackPressed() {
        exitBy2Click();
    }

    public void exitBy2Click() {
        Timer tExit = null;
        if (!isExit) {
            isExit = true; 
            Toast.makeText(this, "click again to quit", Toast.LENGTH_SHORT).show();
            tExit = new Timer();
            tExit.schedule(new TimerTask() {
                @Override
                public void run() {
                    isExit = false;
                }
            }, 2000);

        } else {
            finish();
            System.exit(0);
        }
    }
}

Then, your "real" activities can extends that BaseActivity and this way, onKeyDown and exitBy2Click will be commom to all classes.

public class MainActivity extends BaseActivity {
    @override
    public void onCreate(Bundle savedInstance) {
    }
}

public class SecundaryActivity extends BaseActivity {
    @override
    public void onCreate(Bundle savedInstance) {
    }
}

//ETC

Upvotes: 3

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