Edittext 只允许字母（以编程方式）

Question

我正在尝试获得一个只允许字母（小写和大写）的editTextview。

它适用于以下代码：

 edittv.setKeyListener(DigitsKeyListener.getInstance("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"));

问题是我得到一个像这样的数字键盘：

要回到普通键盘，我发现了这段代码：

edittv.setKeyListener(DigitsKeyListener.getInstance("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"));

edittv.setInputType(InputType.TYPE_CLASS_TEXT);

它适用于恢复键盘但随后再次允许所有字符，因此它撤消了以前的代码。

那么，我怎样才能以编程方式只允许使用字母键盘的字母。

Answer 1

您可以在下面使用此代码：InputFilter filter = new InputFilter() {public CharSequence filter(CharSequence source, int start, int end,&nbsp; &nbsp; &nbsp; &nbsp; Spanned dest, int dstart, int dend) {&nbsp; &nbsp; for (int i = start; i < end; i++) {&nbsp; &nbsp; &nbsp; &nbsp; if (!Character.isLetter(source.charAt(i))&&!Character.isSpaceChar(source.charAt(i))) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return "";&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; return null;}};edit.setFilters(new InputFilter[] { filter });

Answer 2

在这里，您正在使用仅允许数字的DigitsKeyListener扩展NumberKeyListener，这就是您收到该错误的原因。这是我满足您要求的解决方案，在您的 XML 中使用此行。&nbsp; <EditText&nbsp; &nbsp; &nbsp; &nbsp; android:id="@+id/edt_username"&nbsp; &nbsp; &nbsp; &nbsp; android:layout_width="match_parent"&nbsp; &nbsp; &nbsp; &nbsp; android:layout_height="wrap_content"&nbsp; &nbsp; &nbsp; &nbsp; android:hint="Username"&nbsp; &nbsp; &nbsp; &nbsp; android:digits="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ "/>注意： - 空格在数字末尾给出，让用户也可以输入空格以编程方式： -&nbsp; &nbsp; edittv.setInputType(InputType.TYPE_CLASS_TEXT);&nbsp; &nbsp; edittv.setFilters(new InputFilter[]{&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new InputFilter() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; public CharSequence filter(CharSequence src, int start,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;int end, Spanned dst, int dstart, int dend) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (src.equals("")) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return src;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (src.toString().matches("[a-zA-Z ]+")) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return src;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return "";&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; });