Xamarin的TextView颜色部分

Question

I want my TextView in my ViewSwitcher to switch colors between green and white every new line. I figure out how to change the color, but only of the entire TextView with the method:

SetTextColor()

Answer 1

You would need to use TextFormatted property of the TextView. Some sample you can find on Xamarin forums: https://forums.xamarin.com/discussion/9403/setting-a-textview-to-a-spannable-string

Answer 2

I want my TextView in my ViewSwitcher to switch colors between green and white every new line. I figure out how to change the color, but only of the entire TextView

You can use TextFormatted together with Android.Text.SpannableString to set the color:

int lineCount = tvResult.LineCount;
SpannableString spannableText =new SpannableString(tvResult.Text);
for (int i = 0; i < lineCount; i++)
{
   int start=tvResult.Layout.GetLineStart(i);
   int end = tvResult.Layout.GetLineEnd(i);
   if (i % 2 == 1)
   {
       spannableText.SetSpan(new ForegroundColorSpan(Android.Graphics.Color.Yellow), start, end, SpanTypes.Composing);
   }
   else
   {
       spannableText.SetSpan(new ForegroundColorSpan(Android.Graphics.Color.Green), start, end,SpanTypes.Composing);
   }
}
tvResult.TextFormatted = spannableText;

Notes: tvResult is just a TextView control.