Expandable TextView With Smooth Transition Animation
## How do Imp ？ ##
* In Java
```java
//create tmp textview to calculate TextView Height
StringBuilder sb = new StringBuilder();
//...
int width = getScreenWidth() - getMarginPlusPadding();
TextView tmpTextView = new TextView(getContext());
tmpTextView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mNormalSize);
SpannableString spannableString = hightLightAction(sb.toString());
tmpTextView.setText(spannableString);
tmpTextView.setPadding(getPaddingLeft(), getPaddingTop(), getPaddingRight(), getPaddingBottom());
tmpTextView.setLineSpacing(mRowSpace, 1);
TextPaint textPaint = tmpTextView.getPaint();
StaticLayout staticLayout = new StaticLayout(spannableString,textPaint,width,Layout.Alignment.ALIGN_NORMAL, 1, mRowSpace, false);
return staticLayout.getHeight();
// so StaticLayout can getHeight or getLineCount ....
```
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