CODEWITHSUNDEEP
javaandroid
Vlad Iancu
Vlad Iancu

Reputation: 487

Can i make a certain value visible to all classes? (Android)

I have an app which uses Google Maps and GPScoordinates. I need the current location in multiple classes, and i don't want to use intent.putExtra and getExtra everytime. Can I make a certain value visible to all classes in my app?

Upvotes: 0

Views: 177

Answers (3)

Matt T.
Matt T.

Reputation: 549

There are a number of ways to do this, SharedPreferences is one but I think the best mechanism would be to use a global context. You do this by overriding Application with a custom class.

public class GlobalContext extends Application{

    private String mSomething;

    public String getSomething() {
        return mSomething;
    }

    public void setSomething(String value) {
       mSomething = value;
    }

That is then used in your manifest 

<application
        android:name="com.example.GlobalContext"
        ...

Then in all of your activities a call to getApplicationContext will return the instance of that class.

final GlobalContext globalContext = (GlobalContext) getApplicationContext();

Upvotes: 1

Hasam
Hasam

Reputation: 782

Can't say this answer is better than the answers posted above, but why not use a Singleton class?

eg

public class GPSValues{
    public static GPSValues INSTANCE = new GPSValues();

    protected double lat, lon, alt;

    public static GPSValues getInstance(){
        return INSTANCE;
    }

    public double getLat(){
        return lat;
    }
.
.
.
}

Then to use it, just do GPSValues.getInstance().setLat(number) and double lat = GPSValues.getInstance().lat

Upvotes: 1

Dillon Drobena
Dillon Drobena

Reputation: 921

I think a very "hacky" way to go about it is just make the information you want to share public. Then access it from another activity, such as var coordinates = MainActivity.GPScoordinates This isn't the best approach, but its certainly simple.

Upvotes: 0

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