android-修改TextView中部分文字的颜色

 

 textView = (TextView) findViewById(R.id.textview);
 SpannableStringBuilder builder = new SpannableStringBuilder(textView.getText().toString());

 //ForegroundColorSpan 为文字前景色，BackgroundColorSpan为文字背景色
 ForegroundColorSpan redSpan = new ForegroundColorSpan(Color.RED);
 ForegroundColorSpan whiteSpan = new ForegroundColorSpan(Color.WHITE);
 ForegroundColorSpan blueSpan = new ForegroundColorSpan(Color.BLUE);
 ForegroundColorSpan greenSpan = new ForegroundColorSpan(Color.GREEN);
 ForegroundColorSpan yellowSpan = new ForegroundColorSpan(Color.YELLOW);



 builder.setSpan(redSpan, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 builder.setSpan(whiteSpan, 1, 2, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
 builder.setSpan(blueSpan, 2, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 builder.setSpan(greenSpan, 3, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 builder.setSpan(yellowSpan, 4,5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

 textView.setText(builder);

Spanned.SPAN_EXCLUSIVE_EXCLUSIVE，这是在 setSpan 时需要指定的 flag，它的意义我试了很久也没试出来，睡个觉，今天早上才突然有点想法，试之，果然。它是用来标识在 Span 范围内的文本前后输入新的字符时是否把它们也应用这个效果。分别有 Spanned.SPAN_EXCLUSIVE_EXCLUSIVE(前后都不包括)、Spanned.SPAN_INCLUSIVE_EXCLUSIVE(前面包括，后面不包括)、Spanned.SPAN_EXCLUSIVE_INCLUSIVE(前面不包括，后面包括)、Spanned.SPAN_INCLUSIVE_INCLUSIVE(前后都包括)。看个截图就更明白了： 

 
对比一下 

 

测试的Demo

public void setTextColor3() {
		mTextView = (TextView) findViewById(R.id.textview);

		// ForegroundColorSpan 为文字前景色，BackgroundColorSpan为文字背景色
		//ForegroundColorSpan不能被复用，属于一次性属性，只能给一个字段赋这样的属性
		ForegroundColorSpan redSpan = new ForegroundColorSpan(Color.RED);
		ForegroundColorSpan whiteSpan = new ForegroundColorSpan(Color.WHITE);
		ForegroundColorSpan blueSpan = new ForegroundColorSpan(Color.BLUE);
		ForegroundColorSpan greenSpan = new ForegroundColorSpan(Color.GREEN);
		ForegroundColorSpan yellowSpan = new ForegroundColorSpan(Color.YELLOW);

		String[] array = { "word", "tell", "me", "hhe", "wo", "heihei","shuia", "ui" };
		int[] score = { 90, 59, 90, 12, 22, 61, 11, 79 };

		SpannableStringBuilder builder1 = new SpannableStringBuilder("");
		int start = 0;
		int end = 0;
		for (int i = 0; i < array.length; i++) {
			
			start = builder1.length();
			builder1.append(array[i] + " ");//添加你的字符串
			end = builder1.length();
			
			if (score[i] > 60) {
				builder1.setSpan(new ForegroundColorSpan(Color.GREEN), start,
						end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
			} else {
				builder1.setSpan(new ForegroundColorSpan(Color.RED), start,
						end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
			}

		}
		mTextView.setText(builder1);

	}