java - What I missing when tried to retrieve data from Shared Preferences -


hey guyz check out missing here cause of not able fetch data shared preferences. making such tasklist application in saving data(means mytask) key , storing in shared preferences , increments variable total count.

check code(whenever click on addtask button following code gets executed).

private void savetosharedpreference(){     sharedpre = getsharedpreferences("todopref",context.mode_private);     editor = sharedpre.edit();     string mykey = "key"+a;     string myvalue = et.gettext().tostring();     editor.putstring(mykey,myvalue); //        editor.putint("totaltask", a);     editor.commit(); }

now when close application , open again following code gets executed in order load data shared preferences.

private  void loaddata(){     sharedpre = getsharedpreferences("todopref",context.mode_private);     int p = 1;     string mykey = "key"+p;     while(sharedpre.getstring(mykey,"") != null){         toast.maketext(this, sharedpre.getstring(mykey,""),toast.length_short).show();     } }

but problem returning null on indexes. don't know why getting error. please me in advance sarosh madara

to load saved values use following code:

private void loaddata() {         sharedpreferences sharedpre = getsharedpreferences("todopref",android.content.context.mode_private);         map<string,?> keys = sharedpre.getall();         for(map.entry<string,?> entry : keys.entryset()){                 if (entry.getvalue().tostring().length() > 0) {                     log.d("map values",entry.getkey() + ": " + entry.getvalue().tostring());                      }          }     }

i found here added check ignore null values.

to save values shared preference suggest using instance of current time key. no need save integer key values:

private void savetosharedpreference(string myvalue){         sharedpreferences sharedpre = getsharedpreferences("todopref",android.content.context.mode_private);         editor editor = sharedpre.edit();         string key = string.valueof(calendar.getinstance().gettimeinmillis());         editor.putstring(key,myvalue);         editor.commit();     }

so whenever want add values shared preferences use:

savetosharedpreference("myvalue");

and load them use:

loaddata();

the map interface

a map object maps keys values. map cannot contain duplicate keys: each key can map @ 1 value. read more...

sharedpreferences: class overview


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