CODEWITHSUNDEEP
javaandroid
mmmaaak
mmmaaak

Reputation: 833

Global object of android app

i am developing an android app. I have some activities in it. And i must have an object which can be available from all activities. Any ideas how to organize it?

Upvotes: 6

Views: 5322

Answers (4)

tryp
tryp

Reputation: 1120

First, create a class named MasterActivity which extends Activity and define your global object. 

public class MasterActivity extends Activity
{
     public Object mObject;
}

Then, you have to extend your main activity class with your MasterActivity like it : 

// your main activity
public class MainActivity extends MasterActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        // you can now use mObject in your main class
        mObject.yourmethod();
    }
}

By this way, you will be able to use your object in all your activities simply by extending MasterActivity instead of Activity.

Upvotes: 0

Ashwin N Bhanushali
Ashwin N Bhanushali

Reputation: 3882

Use the global Application object in the following way:

package com.yourpackagename;

public class App extends Application {
}

In AndroidManifest.xml:

<application android:name=".App">

To access it from an Activity:

App globalApp = (App) getApplicationContext();

The App class will be instantiated automatically when the app starts. It will be available as long as the application process is alive. It can act as a global store in which you can put your things and have access to them throughout the application lifetime.

Upvotes: 12

PhatHV
PhatHV

Reputation: 8141

You can use SharedPreferences in this case:

To add or edit:

SharedPreferences prefs = this.getSharedPreferences("Cusom Name", Activity.MODE_PRIVATE);
prefs.edit().putString("your_key", value).commit();

To clear:

SharedPreferences prefs = this.getSharedPreferences("Cusom Name", Activity.MODE_PRIVATE);
prefs.edit().clear();

To get value:

SharedPreferences prefs = this.getSharedPreferences("Cusom Name", Activity.MODE_PRIVATE);               
String value = prefs.getString("your_key", "");

Upvotes: 1

mfsiega
mfsiega

Reputation: 2872

There are a few ways to do this. If the object you want to share is a String (or easily described with a String), I would recommend Shared Preferences. It serves as a key-value store for sharing data within an application.

If this is not the case (i.e. the suitability of a String), you could consider passing it as an extra with the Intent that launches your various activities. For example:

Intent newActivity = new Intent(CurrentActivity.class, ActivityToLaunch.class);
newActivity.putExtra("object_key", Bundle_With_Your_Object);

For more details on this strategy (especially about the Bundle class, if you're not familiar), I would read this Android doc.

Upvotes: 3

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