How to limit EditText maximum number of input characters in Android

Method One:

Set the text edit box property as a character limit in an XML file

such as: Android:maxlength= "10" that is, limit the maximum number of input characters is 10

Method Two:

Using Inputfilter in your code to filter

Edittext.setfilters (New Inputfilter[]{new Inputfilter.lengthfilter (20)}); That is, limit the maximum number of input characters to 20

[Java]View Plaincopy

2. Public class Texteditactivity extends Activity {
4. /** Called when the activity is first created. * /
6. @Override
8. public void OnCreate (Bundle savedinstancestate) {
10. super.oncreate (savedinstancestate);
12. Setcontentview (R.layout.main);
16. EditText EditText = (EditText) Findviewbyid (r.id.entry);
18. Edittext.setfilters (new inputfilter[]{new Inputfilter.lengthfilter (20)});
20. }
22. }

Method Three:

Use Textwatcher for monitoring

[Java]View Plaincopy

2. Package cie.textedit;
6. Import android.text.Editable;
8. Import android.text.Selection;
10. Import Android.text.TextWatcher;
12. Import Android.widget.EditText;
16. /*
18. * Listen for input content exceeding maximum length and set cursor position
20. * */
22. Public class Maxlengthwatcher implements Textwatcher {
26. private int maxlen = 0;
28. private EditText EditText = null;
34. Public maxlengthwatcher (int maxlen, EditText EditText) {
36. This.maxlen = MaxLen;
38. this.edittext = EditText;
40. }
44. public void aftertextchanged (Editable arg0) {
46. //TODO auto-generated method stub
50. }
54. public void beforetextchanged (charsequence arg0, int arg1, int arg2,
56. int Arg3) {  
58. //TODO auto-generated method stub
62. }
66. public void ontextchanged (charsequence arg0, int arg1, int arg2, int arg3) {
68. //TODO auto-generated method stub
70. Editable Editable = Edittext.gettext ();
72. int len = Editable.length ();
76. if (len > MaxLen)
78. {
80. int selendindex = selection.getselectionend (editable);
82. String str = editable.tostring ();
84. //Intercept new string
86. String newstr = str.substring (0,maxlen);
88. Edittext.settext (NEWSTR);
90. Editable = Edittext.gettext ();
94. //Length of new string
96. int newlen = Editable.length ();
98. //old cursor position exceeds string length
100. if (Selendindex > Newlen)
102. {
104. Selendindex = Editable.length ();
106. }
108. //Set the location where the new cursor is located
110. Selection.setselection (editable, selendindex);
114. }
116. }
120. }

The call to the corresponding activity part is:

[Java]View Plaincopy

2. Package cie.textedit;
6. Import android.app.Activity;
8. Import Android.os.Bundle;
10. Import Android.text.InputFilter;
12. Import Android.widget.EditText;
16. Public class Texteditactivity extends Activity {
18. /** Called when the activity is first created. * /
20. @Override
22. public void OnCreate (Bundle savedinstancestate) {
24. super.oncreate (savedinstancestate);
26. Setcontentview (R.layout.main);
30. EditText EditText = (EditText) Findviewbyid (r.id.entry);
32. Edittext.addtextchangedlistener (new Maxlengthwatcher (Ten, EditText));
36. }
38. }

Limit the number of input characters to 10

Main.xml file

[HTML]View Plaincopy

2. <? XML version= "1.0" encoding="Utf-8"?>
4. <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
6. android:layout_width="fill_parent"
8. android:layout_height="fill_parent">
10. <TextView
12. android:id="@+id/label"
14. android:layout_width="fill_parent"
16. android:layout_height="wrap_content"
18. android:text="Type here:"/>
20. <EditText
22. android:id="@+id/entry"
24. android:singleline="true"
26. android:layout_width="fill_parent"
28. android:layout_height="wrap_content"
30. android:background="@android:d rawable/editbox_background"
32. android:layout_below="@id/label"/>
34. <Button
36. android:id="@+id/ok"
38. android:layout_width="wrap_content"
40. android:layout_height="wrap_content"
42. android:layout_below="@id/entry"
44. android:layout_alignparentright="true"
46. android:layout_marginleft="10dip"
48. android:text="OK" />
50. <Button
52. android:layout_width="wrap_content"
54. android:layout_height="wrap_content"
56. android:layout_toleftof="@id/ok"
58. android:layout_aligntop="@id/ok"
60. android:text="Cancel" />
62. </relativelayout>

The cursor stops at the end after the effect has entered 10 characters

How to limit EditText maximum number of input characters in Android