Question

我有EditText和3个颜色选择框。我想选择一种颜色，然后开始在EditText中键入文本。目前，我只能编写文本，选择它然后更改文本的颜色。

我试过以下但没有工作：

将ForegroundColorSpan范围设置为Spannable.SPAN_INCLUSIVE_INCLUSIVE中的TextWatcher和onCheckedChanged
为每个角色添加跨度
删除所有跨度，然后再添加新的

我还试图打印所有跨度的颜色，看起来跨度正确添加，但EditText没有按照这些跨度显示颜色。例如：

char = 0 (T)
    span 0 = Green
    span 1 = Green
char = 1 (E)
    span 0 = Green
    span 1 = Green
char = 1 (S)
    span 0 = Green
    span 1 = Red
char = 2 (T)
    span 0 = Green
    span 1 = Red

Output: EditText shows "TEST" in all green color
Note: selecting the text and applying span shows correct colors in EditText

- ＆GT;布局/ activity.xml

<EditText
    android:id="@+id/edittext"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textMultiLine|textNoSuggestions" />

- ＆GT; MainActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    .......

    mEdittext.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
            spannable.setSpan(new ForegroundColorSpan(selectedColor), i, i, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
        }

        @Override
        public void afterTextChanged(Editable editable) {

        }
    });
}

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {

    Spannable spannable = this.mEditText.getText();
    int selStart = this.mEditText.getSelectionStart();
    int selEnd = this.mEditText.getSelectionEnd();

    if(group.getId() == R.id.radioGroupColor) {

        int selected = 0;
        switch (checkedId) {
            case R.id.radioGreen:
                selected = Color.GREEN;
                break;
            case R.id.radioRed:
                selected = Color.RED;
                break;
            case R.id.radioBlue:
                selected = Color.BLUE;
                break;
        }

        if(selStart == selEnd) {
            // There is no selection 
        } else {
            spannable.setSpan(new ForegroundColorSpan(selected), selStart, selEnd, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
        }
    }

}

Answer 1

在EditText
中键入文本之前设置文本颜色

良好做法，我建议您使用TextWatcher。您应该覆盖 onTextChanged 方法。

onTextChanged （CharSequence s，int start，int before，int count） - 调用此方法是为了在s内通知您计数从开头开始的字符刚刚替换了旧文本之前的长度。

  public void onTextChanged(CharSequence s, int start, int before, int count) {
                // Your Work

    }

阅读TextWatcher Example。

Android - 在EditText中键入文本之前设置文本颜色

1 个答案: