Android: Retrieving shared preferences of other ap

问题:

I have a settings application from which i have to retrieve other applications preferences, but i don\'t have the details of keys in them, how can i retrieve all the available keys and values in that preference?

Thanks, Swathi

回答1:

Assuming the preference are WORLD_READABLE, this might work:

final ArrayList<HashMap<String,String>> LIST = new ArrayList<HashMap<String,String>>();
Context myContext = createPackageContext(\"com.example\", 
Context.MODE_WORLD_WRITEABLE); // where com.example is the owning  app containing the preferences
  SharedPreferences testPrefs = myContext.getSharedPreferences 
(\"test_prefs\", Context.MODE_WORLD_READABLE); 


Map<String, ?> items = testPrefs .getAll();
for(String s : items.keySet()){
    //do somthing like String value=  items.get(s).toString());
    }

回答2:

Okay! using this code in Application 1 ( with package name is \"com.sharedpref1\" ) to store data with Shared Preferences.

SharedPreferences prefs = getSharedPreferences(\"demopref\",
                    Context.MODE_WORLD_READABLE);
            SharedPreferences.Editor editor = prefs.edit();
            editor.putString(\"demostring\", strShareValue);
            editor.commit();

And using this code in Application 2 to get data from Shared Preferences in Application 1. We can get it because we use MODE_WORLD_READABLE in application 1:

    try {
                con = createPackageContext(\"com.sharedpref1\", 0);
                SharedPreferences pref = con.getSharedPreferences(
                        \"demopref\", Context.MODE_PRIVATE);
                String data = pref.getString(\"demostring\", \"No Value\");
                displaySharedValue.setText(data);

            } catch (NameNotFoundException e) {
                Log.e(\"Not data shared\", e.toString());
            }

More information please visit this URL: http://androiddhamu.blogspot.in/2012/03/share-data-across-application-in.html

回答3:

Additionally you have to add same android:sharedUserId in the both app\'s manifest file.

回答4:

Unfortunately the docs now don\'t even explain MODE_WORLD_READABLE and MODE_WORLD_WRITEABLE, instead saying:

This constant was depreciated in API level 17. Creating world-readable files is very dangerous, and likely to cause security holes in applications. It is strongly discouraged; instead, ....etc

Since the depreciation, implementing file sharing between apps with sharedpreferences may be too risky, although it was simple. I\'m not too concerned with security holes from the MODE_WORLD_READABLE mode in game apps where I just want to be able to transfer characters from one app to another. It\'s too bad they depreciated both sharing modes.

回答5:

It can work if we want read perference value from other app/pkg/process. but there is something wrong in jkhouw1\'s answer:

Context myContext = createPackageContext(\"com.example\", 
            Context.MODE_WORLD_WRITEABLE);

It should be :

Context myContext = createPackageContext(\"com.example\", 
            Context.CONTEXT_IGNORE_SECURITY);

though , CONTEXT_IGNORE_SECURITY and MODE_WORLD_WRITEABLE with the same value of \"int 2\" At all ,thanks for this question and answers.

回答6:

It\'s simple to retrieve store shared preferences data of one application to another application.

Step 1: add the same android:sharedUserId=\"android.uid.shared\" in both app\'s manifest files.

Step 2: Store Value application1

 SharedPreferences preferences = context.getSharedPreferences(\"token_id\",    Context.MODE_WORLD_READABLE);
        Editor editor = preferences.edit();
        editor.putString(\"shared_token\", encryptedValue);
        Log.e(\"aaa *** shared_token : \", encryptedValue.toString());
        editor.commit();

Step 3: Get Value From application2

Context con = null;
        try {
            con = createPackageContext(\"application2 package name\", Context.CONTEXT_IGNORE_SECURITY);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }

        try {
            if (con != null) {
                SharedPreferences pref = con.getSharedPreferences(
                        \"token_id\", Context.MODE_WORLD_READABLE);

                String data = pref.getString(\"shared_token\", \"\");
                Log.d(\"msg\", \"Other App Data: \" + data);
            } else {
                Log.d(\"msg\", \"Other App Data: Context null\");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }