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EditText输入手机号自动带空格

xml:

<EditText
android:id="@+id/edit_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入手机号"
android:inputType="number"
android:maxLength="13"/>

Activity:

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

}

@Override
public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
if (charSequence == null || charSequence.length() == 0)
return;
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < charSequence.length(); i++) {
if (i != 3 && i != 8 && charSequence.charAt(i) == ‘ ‘) {
continue;
} else {
stringBuilder.append(charSequence.charAt(i));
if ((stringBuilder.length() == 4 || stringBuilder.length() == 9)
&& stringBuilder.charAt(stringBuilder.length() - 1) != ‘ ‘) {
stringBuilder.insert(stringBuilder.length() - 1, ‘ ‘);
}
}
}
if (!stringBuilder.toString().equals(charSequence.toString())) {
int index = start + 1;
if (stringBuilder.charAt(start) == ‘ ‘) {
if (before == 0) {
index++;
} else {
index--;
}
} else {
if (before == 1) {
index--;
}
}
mEditText.setText(stringBuilder.toString());
mEditText.setSelection(index);
}
}

@Override
public void afterTextChanged(Editable s) {

}
});

EditText输入手机号自动带空格