一个textview中显示两种不同颜色的内容

import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ForegroundColorSpan;
import android.widget.TextView;

/**
 * 目前是在一个textview中显示两种不同颜色的内容，满足目前需求，暂不改成更通用的方式
 * 
 * @author wangll
 * 
 */

public class TextViewUtil {

  public static void setTextViewColor(int fristColor, int secondColor, TextView textView, String nickName, String content) {
    int nameLength = nickName.length();
    SpannableStringBuilder builder = new SpannableStringBuilder(nickName + content);
    // ForegroundColorSpan 为文字前景色，BackgroundColorSpan为文字背景色
    ForegroundColorSpan redSpan = new ForegroundColorSpan(fristColor);
    ForegroundColorSpan whiteSpan = new ForegroundColorSpan(secondColor);
    builder.setSpan(redSpan, 0, nameLength, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    builder.setSpan(whiteSpan, nameLength, nameLength+content.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
    textView.setText(builder);
  }

  public static void setTextViewColor(int fristColor, int secondColor, int thirdColor, TextView textView, String fristText, String nickName, String content) {
    int fristLength = fristText.length();
    int nickNameLength = nickName.length();
  
    SpannableStringBuilder builder = new SpannableStringBuilder(fristText+nickName + content);
    // ForegroundColorSpan 为文字前景色，BackgroundColorSpan为文字背景色
    ForegroundColorSpan redSpan = new ForegroundColorSpan(fristColor);
    ForegroundColorSpan whiteSpan = new ForegroundColorSpan(secondColor);
    ForegroundColorSpan thirdSpan = new ForegroundColorSpan(thirdColor);
    builder.setSpan(redSpan, 0, fristLength, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    builder.setSpan(whiteSpan, fristLength, nickNameLength+fristLength, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
    builder.setSpan(thirdSpan, nickNameLength+fristLength, nickNameLength+fristLength+content.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
    textView.setText(builder);
    
  }

}

方式二.

​

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.support.annotation.Nullable;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.TextUtils;
import android.text.style.ForegroundColorSpan;
import android.util.AttributeSet;

import cn.mvp.mlibs.R;


/**

 * Android自定义TextView实现必填项前面的*号
 */
public class RequiredTextView extends android.support.v7.widget.AppCompatTextView {

    private String prefix = "*";
    private int prefixColor = Color.RED;

    public RequiredTextView(Context context) {
        super(context);
    }

    public RequiredTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public RequiredTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context, attrs);
    }

    private void init(Context context, @Nullable AttributeSet attrs) {
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.RequiredTextView);

        prefix = ta.getString(R.styleable.RequiredTextView_prefix);
        prefixColor = ta.getInteger(R.styleable.RequiredTextView_prefix_color, Color.RED);
        String text = ta.getString(R.styleable.RequiredTextView_android_text);
        if (TextUtils.isEmpty(prefix)) {
            prefix = "*";
        }
        if (TextUtils.isEmpty(text)) {
            text = "";
        }
        ta.recycle();
        setText(text);
    }

    public void setText(String text) {
        Spannable span = new SpannableString(prefix + text);
        span.setSpan(new ForegroundColorSpan(prefixColor), 0, prefix.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        setText(span);
    }

}

<declare-styleable name="RequiredTextView">
        <attr name="android:text" />
        <attr name="prefix" format="string|reference" />
        <attr name="prefix_color" format="color|reference" />
    </declare-styleable>