Android implements TextView implementation code with different font colors

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/**
  * Project name: trunk
  * Class Description:
  * Created by: Administrator
  * Created at: 2015/12/10 14:05
  * Modified by: Administrator
  * Modification time: 2015/12/10 14:05
  * Remarks for modification:
  */
public class DifferentColorTextView extends TextView{
 public DifferentColorTextView(Context context) {
  super(context);
 }

 public DifferentColorTextView(Context context, AttributeSet attrs) {
  super(context, attrs);
 }

 public DifferentColorTextView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
 }

 @Override
 protected void onDraw(Canvas canvas) {
  (canvas);
 }
 public void setDifferentColorText(List<String> text,List<Integer>colors){
  setText(calculateResidue(text,colors));
 }
 /**Show different colors*/
 private SpannableStringBuilder calculateResidue(List<String> text, List<Integer>colors) {
  if(text==null||colors==null){
   return null;
  }
  StringBuilder sb =new StringBuilder();
  for (int i=0;i<();i++){
   ((i));
  }
  SpannableStringBuilder ssb=new SpannableStringBuilder(());
  int begin=0;
  for (int i=0;i<();i++){
   ForegroundColorSpan mSpan = new ForegroundColorSpan((i));
   (mSpan,begin,begin+(i).length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
   begin=begin+(i).length();
  }
  return ssb;
 }
}