利用SpannableString给特殊字符加颜色

通过SpannableString来给特殊的字符加特别的颜色。

主要的函数内容如下

private void initData() {
		AssetManager am = getAssets();//得到Assets对象
		InputStream in = null;
		try {
			in = am.open("test/english.txt");//打开assets目录下面的文件并赋值给InputStream对象
		} catch (IOException e2) {
			e2.printStackTrace();
		}
		
		String result = "";
		long size = 0;
		try {
			size = in.available();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
		byte[] buffer = new byte[(int) size];
		try {
			in.read(buffer);
		} catch (IOException e) {
			e.printStackTrace();
		}

		result = EncodingUtils.getString(buffer, "UTF-8");//字符转换,默认使用UTF-8
		
		SpannableString ss = new SpannableString(result);
		int length = result.length();//此字符串数
		int i = 0;
		char ch;
		int start = 0, end = 0;
		boolean bSpecial = false;
		while (length > 0)
		{
			ch = result.charAt(i);
			if (ch == '[') {
				bSpecial = true;
				start = i;//记录限定字符的开始位置
			}
			if (ch == ']' && bSpecial) {
				end = i;//记录限定字符的结束位置
				//给限定字符之间的字符着色
				ss.setSpan(new ForegroundColorSpan(Color.RED), start+1, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
				bSpecial = false;
				start = 0;
				end = 0;
			}
			length--;
			i++;
		}
		tv.setText(ss);//显示
	}

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