Merge pull request #24 from vitorhugods/master

@vitorhugods Added possibility to change mask while keeping the text

Author: egslava

MaskedEditText/src/main/java/br/com/sapereaude/maskedEditText/MaskedEditText.java

@@ -39,7 +39,7 @@ public class MaskedEditText extends AppCompatEditText implements TextWatcher {
 	private OnFocusChangeListener focusChangeListener;
     private String allowedChars;
     private String deniedChars;
-
+    private boolean shouldKeepText;
 
     public MaskedEditText(Context context) {
 		super(context);
@@ -120,12 +120,14 @@ public void setOnFocusChangeListener(OnFocusChangeListener listener) {
 
 	private void cleanUp() {
 		initialized = false;
-
+		if(mask == null || mask.isEmpty()){
+                    return;
+                }
 		generatePositionArrays();
-
-		rawText = new RawText();
-		selection = rawToMask[0];
-
+                if (!shouldKeepText || rawText == null) {
+                    rawText = new RawText();
+                    selection = rawToMask[0];
+                }
 		editingBefore = true;
 		editingOnChanged = true;
 		editingAfter = true;
@@ -173,6 +175,14 @@ public MaskedEditText(Context context, AttributeSet attrs, int defStyle) {
 		init();
 	}
 
+        public void setShouldKeepText(boolean shouldKeepText) {
+            this.shouldKeepText = shouldKeepText;
+        }
+
+        public boolean isKeepingText() {
+            return shouldKeepText;
+        }
+
 	public void setMask(String mask) {
 		this.mask = mask;
 		cleanUp();