Here I would like to share the usage of shared preference in
android application. Basically in all application we need option to store a
common data throughout the application. In android if you such a option then
you can use shared preference method.
1. Share data only on single activity
2. Share data on all activities within the application.
3. Share data between the different applications on the
device.
First we see the different types of mode used shared
preference.
MODE_PRIVATE-This
Mode creates the file and it is used within the application.
MODE_WORLD_READABLE- This mode creates the file and it’s readable
from other application in the device.
MODE_WORLD_WRITEABLE
- This mode
creates the file and it’s writable from other application in the device.
Storing Data in Activity Level:
SharedPreferences
mypref=getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor=
mypref.edit();
editor.putString("user", "pass");
editor.commit();
|
Retrieve the data in same activity:
SharedPreferences
mypref=getPreferences(Context.MODE_PRIVATE);
String val=mypref.getString("user", null);
|
Storing Data across different activity Level:
Here we can get storage
data from any activity within the
application
SharedPreferences
mypref= getSharedPreferences("user", Context.MODE_PRIVATE);
SharedPreferences.Editor
editor=mypref.edit();
editor.putString("user1", "test1");
editor.putString("user2", "test2");
editor.putString("user3", "test3");
editor.commit();
|
Retrieve Data across different activity Level::
By using the below code we can get the data from the shared preference.
SharedPreferences
mypref= getSharedPreferences("user", Context.MODE_PRIVATE);
String val=mypref.getString("user1", null);
|
|
Store Sharing data
across application level :
Here by using the below code if we store the data then we
can get the data from the different or another application. This can be achieved
by using the package name.
Here I have mention the two application of package name
1. com.sample.demoapp1
2. .com.sample.demoapp2
SharedPreferences
mypref= getSharedPreferences("user", Context.MODE_WORLD_READABLE);
SharedPreferences.Editor
editor=mypref.edit();
editor.putString("user1", "test1");
editor.commit();
|
Retrieve Data across application level
Context cont;
cont
= createPackageContext("com.sample.demoapp1", 0);
SharedPreferences mypref=cont.getSharedPreferences("user", Context.MODE_PRIVATE);
String x= mypref.getString("user1", null);
txt.setText(x);
|
Here I get the data from the application dempapp1 from
demoapp2
Note:For sharing to application level data must store with
the mode of Context.MODE_WORLD_READABLE
then only it can access from the other application.
If you have any doubts regard using shared preference post
your comments here……..
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