CODEWITHSUNDEEP
androidandroid-activityglobal-variables
Darpan
Darpan

Reputation: 5795

Global variable persists even when app is closed

I have declared a class extending Application to keep a global variable between activities of my app. When I press back from my launcher activity (FirstActivity.Java) my app closes, but the value of variable still remains same, which i do not want. How to achieve it?

Please note - FirstActivity extends BaseActivity

I am creating this whole setup to show a pin activity that asks for pin whenever app starts or comes to foreground from backGround. So I have setup flag to false in onStop() so that pin shows up when it checks the flag in onStart();

I did following -

BaseActivity.Java

public class BaseActivity extends Activity {
    //static boolean flag = true;
    Context con;
    private ApplicationActivity app;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //this.savedInstanceState = savedInstanceState;
        app = (ApplicationActivity)getApplication();
        Log.d("pin", "on Create base");
        con = this;
    }
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        Log.d("pin", "on start 1");
        if(app.isFlag()){
            //Start pin activity here - if pin is true it sets flag to false  
        app.setFlag(false);
        }

    }

ApplicaitonActivity.java

public class ApplicationActivity extends Application{
    private boolean flag = true;

    public boolean isFlag() {
        //SharedPreferences sp = new SharedPreferences();
        return flag;
    }

    public void setFlag(boolean flag) {
        this.flag = flag;
    }

FirstActivity.Java

public class MainActivity extends BaseActivity {
//private Bundle savedInstanceState;
    Context con;
    Button nextActivity;
        
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
        //this.savedInstanceState = savedInstanceState;
        Log.d("pin", "on Create 1");
        con = this;
    }
}

Upvotes: 3

Views: 2125

Answers (1)

mapodev
mapodev

Reputation: 988

How about to set the variable which still keeps the same to null or to reset the variable when you leave the App.

You can use this

@Override
public void onPause() {
    yourVariable = null;
}

or 

@Override
public void onDestroy() {
    yourVariable = null;
}

Also i would recommend to use SharedPreferences to set global variables through your whole app.

Upvotes: 1

Related Questions