Concurrency issue when decrypting/encrypting by keystore keys

.gitignore

@@ -11,6 +11,7 @@
 .idea/modules
 .idea/markdown-navigator.xml
 .idea/modules.xml
+.idea/**
 
 # Gradle:
 .idea/**/gradle.xml

app/src/main/java/devliving/online/securedpreferencestoresample/MainActivity.java

@@ -3,6 +3,8 @@
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
 import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
 import android.view.View;
@@ -20,7 +22,7 @@ public class MainActivity extends AppCompatActivity {
 
     EditText text1, number1, date1, text2, number2;
 
-    Button reloadButton, saveButton, imageDemoBtn;
+    Button reloadButton, saveButton, multiThreadingButton, imageDemoBtn;
 
     String TEXT_1 = "text_short", TEXT_2 = "text_long", NUMBER_1 = "number_int", NUMBER_2 = "number_float", DATE_1 = "date_text", DATE_2 = "date_long";
 
@@ -38,6 +40,7 @@ protected void onCreate(Bundle savedInstanceState) {
 
         reloadButton = (Button) findViewById(R.id.reload);
         saveButton = (Button) findViewById(R.id.save);
+        multiThreadingButton = (Button) findViewById(R.id.multi_threading);
         imageDemoBtn = findViewById(R.id.tryFile);
 
         try {
@@ -79,6 +82,49 @@ public void onClick(View view) {
                 }
             }
         });
+        multiThreadingButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Runnable saveJob = new Runnable() {
+                    @Override
+                    public void run() {
+                        Log.d("queen", Thread.currentThread().getName() + " gets started");
+                        while(true) {
+                            saveData();
+                            reloadData();
+                        }
+                    }
+                };
+
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+                new Thread(saveJob).start();
+            }
+        });
+
 
         imageDemoBtn.setOnClickListener(v -> {
             Intent intent = new Intent(this, FileDemoActivity.class);
@@ -106,17 +152,22 @@ protected boolean recover(Exception e, KeyStore keyStore, List<String> keyAliase
     void reloadData()  {
         SecuredPreferenceStore prefStore = SecuredPreferenceStore.getSharedInstance();
 
-        String textShort = prefStore.getString(TEXT_1, null);
-        String textLong = prefStore.getString(TEXT_2, null);
-        int numberInt = prefStore.getInt(NUMBER_1, 0);
-        float numberFloat = prefStore.getFloat(NUMBER_2, 0);
-        String dateText = prefStore.getString(DATE_1, null);
-
-        text1.setText(textShort);
-        text2.setText(textLong);
-        number1.setText(String.valueOf(numberInt));
-        number2.setText(String.valueOf(numberFloat));
-        date1.setText(dateText);
+        final String textShort = prefStore.getString(TEXT_1, null);
+        final String textLong = prefStore.getString(TEXT_2, null);
+        final int numberInt = prefStore.getInt(NUMBER_1, 0);
+        final float numberFloat = prefStore.getFloat(NUMBER_2, 0);
+        final String dateText = prefStore.getString(DATE_1, null);
+
+        new Handler(Looper.getMainLooper()).post(new Runnable() {
+            @Override
+            public void run() {
+                text1.setText(textShort);
+                text2.setText(textLong);
+                number1.setText(String.valueOf(numberInt));
+                number2.setText(String.valueOf(numberFloat));
+                date1.setText(dateText);
+            }
+        });
     }
 
     void saveData() {

app/src/main/res/layout/activity_main.xml

@@ -76,6 +76,12 @@
                 android:layout_height="wrap_content"
                 android:layout_weight="1"
                 android:text="Save" />
+            <Button
+                android:id="@+id/multi_threading"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="multi-threading" />
         </LinearLayout>
 
         <Button

securedpreferencestore/src/main/java/devliving/online/securedpreferencestore/EncryptionManager.java

@@ -998,4 +998,4 @@ public InvalidMacException() {
             super("Invalid Mac, failed to verify integrity.");
         }
     }
-}
+}