Android:: 使用其他 InputFilter 以编程方式设置 EditText 的最大长度
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Android:: Set max-length of EditText programmatically with other InputFilter
提问by pokoso
I'm using InputFilter like this to allow only alpha and numbers
我像这样使用 InputFilter 只允许字母和数字
private InputFilter[] inputFilters = new InputFilter[] { new InputFilter()
{
@Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend)
{
for (int i = start; i < end; ++i)
{
if (!Pattern.compile("[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890]*").matcher(String.valueOf(source.charAt(i))).matches())
{
return "";
}
}
return null;
}
} };
But problem is "android:maxLength" value in xml file is not working with this InputFilter
但问题是 xml 文件中的“android:maxLength”值不适用于此 InputFilter
I think I need code in InputFilter to set max-length of EditText
我想我需要 InputFilter 中的代码来设置 EditText 的最大长度
Anyone has good idea for this?
有人对此有什么好主意吗？
Thanks
谢谢
采纳答案by Biraj Zalavadia
Just try this way
试试这个方法
InputFilter
输入过滤器
InputFilter filter = new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
for (int i = start; i < end; ++i)
{
if (!Pattern.compile("[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890]*").matcher(String.valueOf(source.charAt(i))).matches())
{
return "";
}
}
return null;
}
};
How to apply
怎样申请
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
EditText edt =(EditText)findViewById(R.id.edt) ;
edt.setFilters(new InputFilter[]{filter,new InputFilter.LengthFilter(10)});
}
回答by Deepak
public void setEditTextMaxLength(int length) {
InputFilter[] filterArray = new InputFilter[1];
filterArray[0] = new InputFilter.LengthFilter(length);
edt_text.setFilters(filterArray);
}
回答by Divins Mathew
A simple one-liner would be:
一个简单的单行是：
myEditText.setFilters(new InputFilter[] { new InputFilter.LengthFilter(10) });
//replace 10 with required length.
回答by IntelliJ Amiya
If we want to limit the character input in an EditText, EditTextin XML layout gives us android:maxLengthto do this. But in java codes you might wonder why there isn't any setMaxLength(int length) function. The reason behind this is that when you want to restrict the EditText to accept certain value, you have to filter them and this would be invoked by setFilters. To make our EditText to have a fixed size we can use the following code.
如果我们想限制EditText 中的字符输入，EditText在 XML 布局中我们android:maxLength可以这样做。但是在 Java 代码中，您可能想知道为什么没有任何setMaxLength(int length) 函数。这背后的原因是，当你想限制 EditText 接受某个值时，你必须过滤它们，这将由 setFilters 调用。为了使我们的 EditText 具有固定大小，我们可以使用以下代码。
EditText et = new EditText(this);
int maxLength = 3;
InputFilter[] FilterArray = new InputFilter[1];
FilterArray[0] = new InputFilter.LengthFilter(maxLength);
et.setFilters(FilterArray);
回答by Ray Hunter
Building on @Deepak's I used the following:
在@Deepak 的基础上，我使用了以下内容：
public void setEditTextMaxLength(final EditText editText, int length) {
InputFilter[] FilterArray = new InputFilter[1];
FilterArray[0] = new InputFilter.LengthFilter(length);
editText.setFilters(FilterArray);
}
回答by Milad Mohamadi
You can use this function very very easy :
您可以非常轻松地使用此功能：
public static void setEditTextMaxLength(EditText editText, int length) {
InputFilter[] FilterArray = new InputFilter[1];
FilterArray[0] = new InputFilter.LengthFilter(length);
editText.setFilters(FilterArray);
}
and use this on your activity:
并在您的活动中使用它：
setEditTextMaxLength(edt_passcode, 5);
回答by Biplob Das
For Kotlin
myEditText.filters = arrayOf(InputFilter.LengthFilter(maxLength))
对于科特林
myEditText.filters = arrayOf(InputFilter.LengthFilter(maxLength))
