Handle null at server end, gson builder for null

Author: amitshekhariitbhu

app/src/main/java/com/sample/MainActivity.java

@@ -73,7 +73,7 @@ protected void onCreate(Bundle savedInstanceState) {
                 String email = "email_" + i;
                 String street = "street_" + i;
                 String place = "place_" + i;
-                contactDBHelper.insertContact(name, phone, email, street, place);
+                contactDBHelper.insertContact(name, phone, email, street, null);
             }
         }
 

debug-db/src/main/java/com/amitshekhar/server/RequestHandler.java

@@ -35,6 +35,7 @@
 import com.amitshekhar.utils.PrefHelper;
 import com.amitshekhar.utils.Utils;
 import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 import com.google.gson.reflect.TypeToken;
 
 import java.io.BufferedReader;
@@ -64,7 +65,7 @@ public class RequestHandler {
     public RequestHandler(Context context) {
         mContext = context;
         mAssets = context.getResources().getAssets();
-        mGson = new Gson();
+        mGson = new GsonBuilder().serializeNulls().create();
     }
 
     public void handle(Socket socket) throws IOException {

debug-db/src/main/java/com/amitshekhar/utils/Constants.java

@@ -31,7 +31,7 @@ private Constants() {
 
     public static final String APP_SHARED_PREFERENCES = "APP_SHARED_PREFERENCES";
     public static final String PK = "pk";
-    public static final String TYPE = "type";
     public static final String NAME = "name";
+    public static final String NULL = "null";
 
 }

debug-db/src/main/java/com/amitshekhar/utils/DatabaseHelper.java

@@ -205,6 +205,9 @@ public static UpdateRowResponse updateRow(SQLiteDatabase db, String tableName, L
         List<String> whereArgsList = new ArrayList<>();
 
         for (RowDataRequest rowDataRequest : rowDataRequests) {
+            if (Constants.NULL.equals(rowDataRequest.value)) {
+                rowDataRequest.value = null;
+            }
             if (rowDataRequest.isPrimary) {
                 if (whereClause == null) {
                     whereClause = rowDataRequest.title + "=? ";
@@ -254,6 +257,9 @@ public static UpdateRowResponse deleteRow(SQLiteDatabase db, String tableName, L
         List<String> whereArgsList = new ArrayList<>();
 
         for (RowDataRequest rowDataRequest : rowDataRequests) {
+            if (Constants.NULL.equals(rowDataRequest.value)) {
+                rowDataRequest.value = null;
+            }
             if (rowDataRequest.isPrimary) {
                 if (whereClause == null) {
                     whereClause = rowDataRequest.title + "=? ";
@@ -281,7 +287,6 @@ public static UpdateRowResponse deleteRow(SQLiteDatabase db, String tableName, L
     }
 
 
-
     public static TableDataResponse exec(SQLiteDatabase database, String sql) {
         TableDataResponse tableDataResponse = new TableDataResponse();
         tableDataResponse.isSelectQuery = false;

debug-db/src/main/java/com/amitshekhar/utils/PrefHelper.java

@@ -155,6 +155,10 @@ public static UpdateRowResponse updateRow(Context context, String tableName, Lis
         String value = rowDataValue.value;
         String dataType = rowDataValue.dataType;
 
+        if (Constants.NULL.equals(value)) {
+            value = null;
+        }
+
         SharedPreferences preferences = context.getSharedPreferences(tableName, Context.MODE_PRIVATE);
 
         try {