我已经这么做了，试试吧:

TextView textView=(TextView)findViewById(R.id.yourTextView);//init

//here I am appending two string into my textView with two diff colors.
//I have done from fragment so I used here getActivity(), 
//If you are trying it from Activity then pass className.this or this; 

textView.append(TextViewUtils.getColoredString(getString(R.string.preString),ContextCompat.getColor(getActivity(),R.color.firstColor)));
textView.append(TextViewUtils.getColoredString(getString(R.string.postString),ContextCompat.getColor(getActivity(),R.color.secondColor)));

在你的TextViewUtils类中添加这个方法:

 /***
 *
 * @param mString this will setup to your textView
 * @param colorId  text will fill with this color.
 * @return string with color, it will append to textView.
 */
public static Spannable getColoredString(String mString, int colorId) {
    Spannable spannable = new SpannableString(mString);
    spannable.setSpan(new ForegroundColorSpan(colorId), 0, spannable.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    Log.d(TAG,spannable.toString());
    return spannable;
}

@Swapnil Kotwal回答的Kotlin版本。

Android Studio 4.0.1, Kotlin 1.3.72

val greenText = SpannableString("This is green,")
greenText.setSpan(ForegroundColorSpan(resources.getColor(R.color.someGreenColor), null), 0, greenText.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
yourTextView.text = greenText

val yellowText = SpannableString("this is yellow, ")
yellowText.setSpan(ForegroundColorSpan(resources.getColor(R.color.someYellowColor), null), 0, yellowText.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
yourTextView.append(yellowText)

val redText = SpannableString("and this is red.")
redText.setSpan(ForegroundColorSpan(resources.getColor(R.color.someRedColor), null), 0, redText.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
yourTextView.append(redText)

芬兰湾的科特林:

@JvmStatic
    @BindingAdapter(
        "app:txt1",
        "app:txt2",
        "app:color1",
        "app:color2",
        requireAll = false
    )
    fun setColors(
        txtView: AppCompatTextView,
        txt1: String,
        txt2: String,
        color1: Int,
        color2: Int
    ) {
        txtView.setColors(txt1 = txt1, txt2 = txt2, color1 = color1, color2)
    }


fun AppCompatTextView.setColors(txt1: String, txt2: String, color1: Int, color2: Int) {


        val word: Spannable = SpannableString(txt1)

        word.setSpan(
            ForegroundColorSpan(ContextCompat.getColor(this.context, color1)),
            0,
            word.length,
            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
        )

        this.text = word
        val wordTwo: Spannable = SpannableString(txt2)

        wordTwo.setSpan(
            ForegroundColorSpan(ContextCompat.getColor(this.context, color2)),
            0,
            wordTwo.length,
            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
        )
        this.append(wordTwo)

    }


<androidx.appcompat.widget.AppCompatTextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:txt1="@{}"
            app:txt2="@{}"
            app:color1="@{}"
            app:color2="@{}" />

试试这个:

mBox = new TextView(context);
mBox.setText(Html.fromHtml("<b>" + title + "</b>" +  "<br />" + 
      "<small>" + description + "</small>" + "<br />" + 
      "<small>" + DateAdded + "</small>"));

我已经写下了一些类似于这个问题的其他问题的代码，但这个问题被复制了，所以我不能回答那里，所以我只是把我的代码放在这里，如果有人寻找相同的要求。

它不是完全工作的代码，你需要做一些小的改变让它工作。

代码如下:

我使用@Graeme的想法使用可扩展文本。

String colorfulText = "colorfulText";       
    Spannable span = new SpannableString(colorfulText);             

    for ( int i = 0, len = colorfulText.length(); i < len; i++ ){
        span.setSpan(new ForegroundColorSpan(getRandomColor()), i, i+1,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);                     
    }   

    ((TextView)findViewById(R.id.txtSplashscreenCopywrite)).setText(span);

随机色法:

  private int getRandomColor(){
        Random rnd = new Random();
        return Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
    }

你可以使用Spannable应用效果到你的TextView:

这是我的例子，只是一个TextView文本的第一部分上色(同时允许您动态设置颜色，而不是硬编码成字符串与HTML的例子!)

    mTextView.setText("Red text is here", BufferType.SPANNABLE);
    Spannable span = (Spannable) mTextView.getText();
    span.setSpan(new ForegroundColorSpan(0xFFFF0000), 0, "Red".length(),
             Spannable.SPAN_INCLUSIVE_EXCLUSIVE);

在这个例子中，你可以将0xFFFF0000替换为getResources().getColor(R.color.red)