This function sets an item with the given key and value.
Note: On Android there is a size limit on the string to be stored. See sap.EncryptedStorage#SIMPLE_STRING_MAXIMUM_LENGTH and sap.EncryptedStorage#COMPLEX_STRING_MAXIMUM_LENGTH for more details.
setItem( key, value, successCallback, errorCallback )
| Name | Type | Description | 
| key | String | The key of the item to set.If null or undefined is passed, "null" is used. | 
| value | String | The value of the item to set.If null or undefined is passed, "null" is used. | 
| successCallback | sap.EncryptedStorage~successCallback | If successful, the successCallback is invoked with no parameters. | 
| errorCallback | sap.EncryptedStorage~errorCallback | If there is an error, the errorCallback is invoked with an ErrorInfo object as the parameter. | 
var store = new sap.EncryptedStorage("storeName", "storePassword");
var successCallback = function() {
   alert("Item has been set.");
}
var errorCallback = function(error) {
   alert("An error occurred: " + JSON.stringify(error));
}
store.setItem("somekey", "somevalue", successCallback, errorCallback);