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在输入时更改EditText中的字符？（Android）

androidandroid-edittexttextchanged
3
我目前有一个应用程序，使用了一种计时器，我有一个编辑文本可以更改时间。我想添加一个功能，当输入一定数量的字符后自动插入冒号或句号，因为更改时间的语法是特定的（必须是XX:XX.X）。
我已经在尝试实现这个功能，但只有在我试着改变编辑文本时它才会出现错误。当我尝试键入时出现错误。
我复制并粘贴了一些我在这里找到的代码，并将其更改以适应我的需求。
editClock = (EditText) findViewById(R.id.editClock);       
editClock.addTextChangedListener(new TextWatcher(){
    int count =1 ;
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2)
    {
        //System.out.println("beforeTextChanged::: => "+charSequence);
    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        //System.out.println("onTextChanged::: => "+charSequence);
    }

    @Override
    public void afterTextChanged(Editable editable) {
        if(count==2)
            editClock.setText(editable.toString()+":");
        if(count==4)
            editClock.setText(editable.toString()+".");
        count++;     
    }
});

这是我遇到的错误： 

12-07 20:34:08.380: E/AndroidRuntime(13549): FATAL EXCEPTION: main
12-07 20:34:08.380: E/AndroidRuntime(13549): java.lang.StackOverflowError
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidtext.TextUtils.getChars(TextUtils.java:77)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidtext.TextUtils.indexOf(TextUtils.java:110)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidtext.StaticLayout.generate(StaticLayout.java:182)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidtext.DynamicLayout.reflow(DynamicLayout.java:284)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidtext.DynamicLayout.<init>(DynamicLayout.java:170)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.makeSingleLayout(TextView.java:6058)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.makeNewLayout(TextView.java:5956)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.checkForRelayout(TextView.java:6495)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3771)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3604)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at com.example.timeonice.MainActivity$2.afterTextChanged(MainActivity.java:149)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.sendAfterTextChanged(TextView.java:7334)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3778)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.TextView.setText(TextView.java:3629)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at     androidwidget.EditText.setText(EditText.java:80)
12-07 20:34:08.380: E/AndroidRuntime(13549):    at an
1
使用TextChangedListener时需要注意递归的问题 - 当你设置文本时，请确保不会触发另一个onTextChanged()。那么错误是什么？ - Peri Hartman
已添加logcat，不确定是否有帮助。 - user3078867
没错，这很有帮助。你正在遭遇无限递归。 - Peri Hartman
1个回答
2

解决这个问题的一种方法是在你的代码中设置一个类级别的标志。在调用setText()之前设置标志，然后在之后清除它。然后，在afterTextChanged()的开头检查你的标志。像这样：

 @Override
 public void afterTextChanged(Editable editable) {
   if (overridingText)
     return;

   if(count==2)
   {
     overridingText = true;
     editClock.setText(editable.toString()+":");
     overridingText = false;
   }
   else if(count==4)
   {
     overridingText = true;
     editClock.setText(editable.toString()+".");
     overridingText = false;
   }

   count++;     
 }

也许Google已经提供了更好的方法来做这件事。但我不确定是否有这样的方法。
太棒了！它运行得很好，唯一的问题是在插入冒号或句号后，它会将光标设置到EditText的开头。 - user3078867
你可以使用 setSelection() 来重新定位光标。 - Peri Hartman
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