在android中具有不同颜色的edittext

Question

我在编辑文本时遇到了一些问题，实际上我需要的是输入的第 10 个字母应该是红色的，然后输入的字母应该是灰色的。我做了颜色改变，问题是当我输入第 11 个字母时，之前输入的所有 10 个字母的颜色也被改变了。我想保持第 10 个字母的颜色不变，只有在第 10 个字母之后才应该改变颜色。请帮帮我。

this is my code, i want user to enter the text in live, after he enter a message of 10 letter,the 11th letter colour should be changed

Answer 1

试试这个代码（我已经测试过它并按预期工作）：

final EditText input = (EditText) findViewById(R.id.my_edittext);
input.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

            Spannable spannable = input.getText();
            if (!TextUtils.isEmpty(s) && s.length() > 9){
                spannable.setSpan(new ForegroundColorSpan(ContextCompat.getColor(MainActivity.this, R.color.my_color_red)),
                        0, 10, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
        }

        @Override
        public void afterTextChanged(Editable s) {}
    });

Answer 2

尝试使用Spannable

Spannable spannable = myEditText.getText();
spannable.setSpan(new ForegroundColorSpan(getResources().getColor(R.color.red)), 0, 9, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

Answer 3

为此使用Spannable字符串

SpannableStringBuilder builder = new SpannableStringBuilder();

SpannableString redSpannable= new SpannableString("yourstring");
redSpannable.setSpan(new ForegroundColorSpan(Color.RED), 0, 11, 0);
builder.append(redSpannable);

SpannableString whiteSpannable= new SpannableString("next string");
whiteSpannable.setSpan(new ForegroundColorSpan(Color.WHITE), 11, 20, 0);
builder.append(whiteSpannable);

editText.setText(builder, BufferType.SPANNABLE);