message for remove onscreen icon

core/src/main/java/org/solovyev/android/calculator/AbstractFixableError.java

@@ -0,0 +1,22 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.Nullable;
+
+public abstract class AbstractFixableError implements FixableError {
+
+	@Nullable
+	private String fixCaption;
+
+	protected AbstractFixableError() {
+	}
+
+	protected AbstractFixableError(@Nullable String fixCaption) {
+		this.fixCaption = fixCaption;
+	}
+
+	@Nullable
+	@Override
+	public CharSequence getFixCaption() {
+		return fixCaption;
+	}
+}

core/src/main/java/org/solovyev/android/calculator/CalculatorFixableError.java

@@ -53,4 +53,10 @@ public enum CalculatorFixableError implements FixableError {
         return null;
     }
 
+
+	@Nullable
+	@Override
+	public CharSequence getFixCaption() {
+		return null;
+	}
 }

core/src/main/java/org/solovyev/android/calculator/FixableError.java

@@ -1,5 +1,7 @@
 package org.solovyev.android.calculator;
 
+import org.jetbrains.annotations.Nullable;
+
 import java.io.Serializable;
 
 /**
@@ -9,5 +11,8 @@ import java.io.Serializable;
  */
 public interface FixableError extends Serializable {
 
+	@Nullable
+	CharSequence getFixCaption();
+
     void fix();
 }