passing object to activity

Question

Can i initialize object in my first activity and you it in all activity???

public class Calc{
    int x;
    int y;
    public Calc(int x, int y) {
       th         


        

Answer 1

make

public class Calc implements Serializable {
int x;
int y;
public Calc(int x, int y) {
   this.x = x;
   this.y = y;
}
public int sum() {
    return x + y;
}

}

and

When you start your PreviewActivity

Intent intent = new Intent(mContext, PreviewActivity .class);
intent.putParcelableArrayListExtra("data",c);
startActivity(intent);

and in your PreviewActivity do this

Calc c=(Calc ) getIntent().getSerializableExtra("data");

Answer 2

How can i pass it to another activity or how can i make it share with other activity

Just use Intent so:

intent.putExtra("calc" new Calc(3, 4));

for passing this Object when you want to start another Activity.

Then in your second Activity just call:

Calc c = getIntent().getParcelableExtra("calc"); // getSerializableExtra("calc");

And your Calc class have to implement Parcelable or Serializable

public class Calc implements Parcelable { 
 ...
}

Answer 3

Use Application class by extending it and writing your custom Application class, and keep your objects in this class that you need in your cross Activities

class MyApplication extends Application{
    Object a;

    public void setA(Object a){
         this.a = a;
    }

    public Object getA(){
         return a;
    }

}

Now lets suppose in your A activity you create object of class Object and want to use it in your B Activity.

do it this way,

class ActivityA extends Activity(){

...
// some where in activity, set your object this way.
     Object aObj = new Object();
     ((MyApplication)getApplication()).setA(aObj);


...

}

class ActivityB extends Activity(){

...
// some where in activity, get your object this way.
     Object aObj = ((MyApplication)getApplication()).getA( );


...

}

You need to tell your androidManifest.xml about your extended Application class.