通过传递String和Color在文本上设置颜色:

private String getColoredSpanned(String text, String color) {
  String input = "<font color=" + color + ">" + text + "</font>";
  return input;
}

通过调用下面的代码设置TextView / Button / EditText等文本:

TextView:

TextView txtView = (TextView)findViewById(R.id.txtView);

获取彩色字符串:

String name = getColoredSpanned("Hiren", "#800000");

在TextView上设置文本:

txtView.setText(Html.fromHtml(name));

Done

当我试图理解一个新概念时，我总是发现视觉例子很有帮助。

背景颜色

SpannableString spannableString = new SpannableString("Hello World!");
BackgroundColorSpan backgroundSpan = new BackgroundColorSpan(Color.YELLOW);
spannableString.setSpan(backgroundSpan, 0, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);

前景颜色

SpannableString spannableString = new SpannableString("Hello World!");
ForegroundColorSpan foregroundSpan = new ForegroundColorSpan(Color.RED);
spannableString.setSpan(foregroundSpan, 0, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);

结合

SpannableString spannableString = new SpannableString("Hello World!");
ForegroundColorSpan foregroundSpan = new ForegroundColorSpan(Color.RED);
BackgroundColorSpan backgroundSpan = new BackgroundColorSpan(Color.YELLOW);
spannableString.setSpan(foregroundSpan, 0, 8, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableString.setSpan(backgroundSpan, 3, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);

进一步的研究

解释SPAN_EXCLUSIVE_EXCLUSIVE等Span标志的含义 Android Spanned, SpannedString, Spannable, SpannableString和CharSequence

设置你的TextView的文本跨度，并为你的文本定义一个ForegroundColorSpan。

TextView textView = (TextView)findViewById(R.id.mytextview01);    
Spannable wordtoSpan = new SpannableString("I know just how to whisper, And I know just how to cry,I know just where to find the answers");          
wordtoSpan.setSpan(new ForegroundColorSpan(Color.BLUE), 15, 30, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);    
textView.setText(wordtoSpan);

create textview in ur layout paste this code in ur MainActivity TextView textview=(TextView)findViewById(R.id.textviewid); Spannable spannable=new SpannableString("Hello my name is sunil"); spannable.setSpan(new ForegroundColorSpan(Color.BLUE), 0, 5, Spannable.SPAN_INCLUSIVE_EXCLUSIVE); textview.setText(spannable); //Note:- the 0,5 is the size of colour which u want to give the strring //0,5 means it give colour to starting from h and ending with space i.e.(hello), if you want to change size and colour u can easily

First Part **Second Part should be Bold** last Part

此文本应该使用SpannableString进行更改

import android.graphics.Typeface.BOLD
import android.text.Spannable
import android.text.Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
import android.text.SpannableString
import android.text.style.BackgroundColorSpan
import android.text.style.ForegroundColorSpan
import android.text.style.StyleSpan

val firstPart = "First Part  "
val secondPart = "Second Part should be Bold"
val thirdPart = "  last Part"
val finalString = firstPart + secondPart + thirdPart

val sb: Spannable = SpannableString(finalString).also {
                // ... Change text Colour
                it.setSpan(
                    ForegroundColorSpan(getColor(requireContext(), R.color.pink)),
                    finalString.indexOf(secondPart),
                    finalString.indexOf(secondPart) + secondPart.length,
                    SPAN_EXCLUSIVE_EXCLUSIVE
                )
                // ... Make the text Bold
                it.setSpan(
                    StyleSpan(BOLD),
                    finalString.indexOf(secondPart),
                    finalString.indexOf(secondPart) + secondPart.length,
                    SPAN_EXCLUSIVE_EXCLUSIVE
                )
                // ... Change Background Colour
                it.setSpan(
                    BackgroundColorSpan(getColor(requireContext(), R.color.lightPink)),
                    finalString.indexOf(secondPart) - 1,
                    finalString.indexOf(secondPart) + secondPart.length + 1,
                    SPAN_EXCLUSIVE_EXCLUSIVE
                )
}

yourTextView.text = sb

另一个答案将非常相似，但不需要设置TextView的文本两次

TextView TV = (TextView)findViewById(R.id.mytextview01);

Spannable wordtoSpan = new SpannableString("I know just how to whisper, And I know just how to cry,I know just where to find the answers");        

wordtoSpan.setSpan(new ForegroundColorSpan(Color.BLUE), 15, 30, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

TV.setText(wordtoSpan);