add setText method

Author: Steven

app/src/main/java/com/dx/dxloadingbutton/MainActivity.java

@@ -34,7 +34,7 @@ public void onClick(View view) {
                 lb.startLoading();
             }
         });
-
+        
         sucBtn.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {

library/src/main/java/com/dx/dxloadingbutton/lib/LoadingButton.java

@@ -17,6 +17,7 @@
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.Typeface;
+import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
@@ -299,6 +300,18 @@ public void setTypeface(Typeface typeface){
         }
     }
 
+    public void setText(String text){
+        if(TextUtils.isEmpty(text)){
+            return;
+        }
+        this.mText = text;
+        mTextWidth = mTextPaint.measureText(mText);
+        Rect bounds = new Rect();
+        mTextPaint.getTextBounds(mText,0,mText.length(),bounds);
+        mTextHeight = bounds.height();
+        invalidate();
+    }
+
 
     public void setResetAfterFailed(boolean resetAfterFailed){
         this.resetAfterFailed = resetAfterFailed;