blocks|key|894760|text|在XML中，您可以将以下行添加到EditText+View中，其中140是最大字符数：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|894761|android:maxLength="140"|code-block|syntax|javascript|894762|entityMap^0|G|8|P|4|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

In XML you can add this line to the <code>EditText</code> <code>View</code> where 140 is the maximum number of characters:

<pre><code>android:maxLength="140"
</code></pre>

blocks|key|678034|text|您可以使用InputFilter，这就是方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|678035|EditText+myEditText+=+(EditText)+findViewById(R.id.editText1);
InputFilter[]+filters+=+new+InputFilter[1];
filters[0]+=+new+InputFilter.LengthFilter(10);+//Filter+to+10+characters
myEditText+.setFilters(filters);|code-block|syntax|javascript|678036|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use a InputFilter, that's the way:

<pre><code>EditText myEditText = (EditText) findViewById(R.id.editText1);
InputFilter[] filters = new InputFilter[1];
filters[0] = new InputFilter.LengthFilter(10); //Filter to 10 characters
myEditText .setFilters(filters);
</code></pre>

blocks|key|894804|text|这对我来说很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|894805|++++etMsgDescription.setFilters(new+InputFilter[]+{new+InputFilter.LengthFilter(maximum_character)});

++++etMsgDescription.addTextChangedListener(new+TextWatcher()+{

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

++++++++++++tvCharacterLimite.setText("+"%2BString.valueOf(maximum_character+-+etMsgDescription.getText().length()));
++++++++}

++++++++@Override
++++++++public+void+beforeTextChanged(CharSequence+s,+int+start,+int+count,
++++++++++++++++int+after)+{
++++++++++++//+TODO+Auto-generated+method+stub

++++++++}

++++++++@Override
++++++++public+void+afterTextChanged(Editable+s)+{
++++++++++++//+TODO+Auto-generated+method+stub

++++++++}
++++});|code-block|syntax|javascript|894806|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

It is working for me. 

<pre><code> etMsgDescription.setFilters(new InputFilter[] {new InputFilter.LengthFilter(maximum_character)});

 etMsgDescription.addTextChangedListener(new TextWatcher() {

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

 tvCharacterLimite.setText(" "+String.valueOf(maximum_character - etMsgDescription.getText().length()));
 }

 @Override
 public void beforeTextChanged(CharSequence s, int start, int count,
 int after) {
 // TODO Auto-generated method stub

 }

 @Override
 public void afterTextChanged(Editable s) {
 // TODO Auto-generated method stub

 }
 });
</code></pre>

blocks|key|678077|text|动态：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|678078|editText.setFilters(new+InputFilter[]+{+new+InputFilter.LengthFilter(MAX_NUM)+});|code-block|syntax|javascript|678079|通过xml：|678080|<EditText
++++android:maxLength="@integer/max_edittext_length"|678081|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Dynamically:

<pre><code>editText.setFilters(new InputFilter[] { new InputFilter.LengthFilter(MAX_NUM) });
</code></pre>

Via xml:

<pre><code>&lt;EditText
 android:maxLength="@integer/max_edittext_length"
</code></pre>

blocks|key|678105|text|我总是这样设置最大值：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|678106|++++<EditText
++++++++android:id="@%2Bid/edit_blaze_it
++++++++android:layout_width="0dp"
++++++++android:layout_height="@dimen/too_high"

++++
++++++++android:maxLength="420"
++++++++/>|code-block|syntax|javascript|678107|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I always set the max like this:

<pre><code> &lt;EditText
 android:id="@+id/edit_blaze_it
 android:layout_width="0dp"
 android:layout_height="@dimen/too_high"

 &lt;!-- This is the line you need to write to set the max--&gt;
 android:maxLength="420"
 /&gt;
</code></pre>

blocks|key|678137|text|它以这种方式对我起作用，这是我发现的最好的。最大长度为200个字符|type|unstyled|depth|inlineStyleRanges|entityRanges|data|678138|editObservations.addTextChangedListener(new+TextWatcher()+{

++++@Override
++++public+void+onTextChanged(CharSequence+s,+int+start,+int+before,+int+count)+{
++++++++if+(editObservations.getText().length()+>=+201){
++++++++++++++++String+str+=+editObservations.getText().toString().substring(0,+200);
++++++++++++++++editObservations.setText(str);
++++++++++++++++editObservations.setSelection(str.length());
++++++++}
++++}

++++@Override
++++public+void+beforeTextChanged(CharSequence+s,+int+start,+int+count,
++++++++++++++++++++++++++++++++++++++++++int+after)+{
++++}

++++@Override
++++public+void+afterTextChanged(Editable+s)+{
++++}
});|code-block|syntax|javascript|678139|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

It worked for me this way, it's the best I've found. 
It is for a max length of 200 characters

<pre><code>editObservations.addTextChangedListener(new TextWatcher() {

 @Override
 public void onTextChanged(CharSequence s, int start, int before, int count) {
 if (editObservations.getText().length() &gt;= 201){
 String str = editObservations.getText().toString().substring(0, 200);
 editObservations.setText(str);
 editObservations.setSelection(str.length());
 }
 }

 @Override
 public void beforeTextChanged(CharSequence s, int start, int count,
 int after) {
 }

 @Override
 public void afterTextChanged(Editable s) {
 }
});
</code></pre>

blocks|key|894981|text|+++<EditText
++++++++android:id="@%2Bid/edtName"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="wrap_content"
++++++++android:hint="Enter+device+name"
++++++++android:maxLength="10"
++++++++android:inputType="textFilter"
++++++++android:singleLine="true"/>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|894982|InputType必须设置"textFilter“|unstyled|894983|++++++++android:inputType="textFilter"|894984|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code> &lt;EditText
 android:id="@+id/edtName"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:hint="Enter device name"
 android:maxLength="10"
 android:inputType="textFilter"
 android:singleLine="true"/&gt;
</code></pre>

InputType has to set "textFilter"

<pre><code> android:inputType="textFilter"
</code></pre>

blocks|key|678256|text|在任何地方都可以轻松使用此函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|678257|+public+static+void+setEditTextMaxLength(EditText+editText,+int+length)+{
++++InputFilter[]+FilterArray+=+new+InputFilter[1];
++++FilterArray[0]+=+new+InputFilter.LengthFilter(length);
++++editText.setFilters(FilterArray);
++}|code-block|syntax|javascript|678258|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

use this function anywhere easily:

<pre><code> public static void setEditTextMaxLength(EditText editText, int length) {
 InputFilter[] FilterArray = new InputFilter[1];
 FilterArray[0] = new InputFilter.LengthFilter(length);
 editText.setFilters(FilterArray);
 }
</code></pre>

blocks|key|678263|text|Kotlin方式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|678264|editText.filters+=+arrayOf(InputFilter.LengthFilter(maxLength))|code-block|syntax|javascript|678265|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Kotlin way

<pre><code>editText.filters = arrayOf(InputFilter.LengthFilter(maxLength))
</code></pre>

blocks|key|895096|text|显然，您可以在xml或InputFilter.LengthFilter中使用maxLength，如上所述。但对我来说，在某些情况下，这是不够的。我为更灵活的EditText设置创建了一个类：https://github.com/devapro/NumberWatcher它只为数字输入实现，但您可以为任何类型更改它。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|895097|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/devapro/NumberWatcher^0|2N|14|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Obviously you can use maxLength in xml or InputFilter.LengthFilter as answered above. But for me in some cases, it was not enough. I created a class for more flexible settings of EditText: <a href="https://github.com/devapro/NumberWatcher" rel="nofollow noreferrer">https://github.com/devapro/NumberWatcher</a>
It is implementation only for numbers input, but you can change it for any of the types.

blocks|key|895141|text|您可以将验证挂钩添加到提交或更改事件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|895142|if+(EditText.length()+<=10){
++++++++++++Toast.makeText(MainAcitvity.this,+"Enter+Valid+Number",+Toast.LENGTH_SHORT).show();
++++++++++++contact.setError("Enter+Valid");
++++++++++++return+false;
++++++++}|code-block|syntax|javascript|895143|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could add a validation hook to a submit or change event.
<pre><code>if (EditText.length() &lt;=10){
 Toast.makeText(MainAcitvity.this, &quot;Enter Valid Number&quot;, Toast.LENGTH_SHORT).show();
 contact.setError(&quot;Enter Valid&quot;);
 return false;
 }
</code></pre>

How do you set the max number of characters for an Android EditText input? I see setMaxLines, setMaxEMS, but nothing for the number of characters.

How do you set the max number of characters for an EditText in Android?

Android

Kotlin

如何设置Android EditText输入的最大字符数？我看到了setMaxLines、setMaxEMS，但没有看到字符数。

问如何在安卓系统中设置EditText的最大字符数？
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