Fix setting texts.

Author: HonzaR

library/src/main/java/uk/co/deanwild/materialshowcaseview/MaterialShowcaseSequence.java

@@ -35,17 +35,24 @@ public MaterialShowcaseSequence(Activity activity, String sequenceID) {
     }
 
     public MaterialShowcaseSequence addSequenceItem(View targetView, String content, String dismissText) {
-        addSequenceItem(targetView, "", content, dismissText);
+        addSequenceItem(targetView, "", content, dismissText, "", "");
         return this;
     }
 
     public MaterialShowcaseSequence addSequenceItem(View targetView, String title, String content, String dismissText) {
+        addSequenceItem(targetView, title, content, dismissText, "", "");
+        return this;
+    }
+
+    public MaterialShowcaseSequence addSequenceItem(View targetView, String title, String content, String dismissText, String closeText, String nextText) {
 
         MaterialShowcaseView sequenceItem = new MaterialShowcaseView.Builder(mActivity)
                 .setTarget(targetView)
                 .setTitleText(title)
                 .setDismissText(dismissText)
                 .setContentText(content)
+                .setCloseText(closeText)
+                .setNextText(nextText)
                 .build();
 
         if (mConfig != null) {

library/src/main/java/uk/co/deanwild/materialshowcaseview/MaterialShowcaseView.java

@@ -433,33 +433,33 @@ void setPosition(int x, int y) {
     }
 
     private void setTitleText(CharSequence contentText) {
-        if (mTitleTextView != null && !contentText.equals("")) {
+        if (mTitleTextView != null && contentText.length() > 0) {
             mTitleTextView.setText(contentText);
         }
     }
 
     private void setContentText(CharSequence contentText) {
-        if (mContentTextView != null) {
+        if (mContentTextView != null && contentText.length() > 0) {
             mContentTextView.setText(contentText);
         }
     }
 
     private void setDismissText(CharSequence dismissText) {
-        if (mDismissButtonText != null) {
+        if (mDismissButtonText != null && dismissText.length() > 0) {
             mDismissButtonText.setText(dismissText);
 
             updateDismissButton();
         }
     }
 
     private void setCloseText(CharSequence closeText) {
-        if (mCloseTextView != null) {
+        if (mCloseTextView != null && closeText.length() > 0) {
             mCloseTextView.setText(closeText);
         }
     }
 
     private void setNextText(CharSequence nextText) {
-        if (mNextTextView != null) {
+        if (mNextTextView != null && nextText.length() > 0) {
             mNextTextView.setText(nextText);
         }
     }
@@ -700,18 +700,21 @@ public Builder setDismissText(int resId) {
             return setDismissText(activity.getString(resId));
         }
 
-        public Builder setDismissText(CharSequence dismissText) {
-            showcaseView.setDismissText(dismissText);
+        public Builder setDismissText(CharSequence text) {
+            if (text != null && text.length() > 0)
+                showcaseView.setDismissText(text);
             return this;
         }
 
-        public Builder setCloseText(CharSequence closeText) {
-            showcaseView.setCloseText(closeText);
+        public Builder setCloseText(CharSequence text) {
+            if (text != null && text.length() > 0)
+                showcaseView.setCloseText(text);
             return this;
         }
 
-        public Builder setNextText(CharSequence nextText) {
-            showcaseView.setNextText(nextText);
+        public Builder setNextText(CharSequence text) {
+            if (text != null && text.length() > 0)
+                showcaseView.setNextText(text);
             return this;
         }
 
@@ -726,7 +729,8 @@ public Builder setContentText(int resId) {
          * Set the descriptive text shown on the ShowcaseView.
          */
         public Builder setContentText(CharSequence text) {
-            showcaseView.setContentText(text);
+            if (text != null && text.length() > 0)
+                showcaseView.setContentText(text);
             return this;
         }
 
@@ -741,7 +745,8 @@ public Builder setTitleText(int resId) {
          * Set the descriptive text shown on the ShowcaseView as the title.
          */
         public Builder setTitleText(CharSequence text) {
-            showcaseView.setTitleText(text);
+            if (text != null && text.length() > 0)
+                showcaseView.setTitleText(text);
             return this;
         }