键入时更改 EditText 中的字符？安卓

Question

我目前有一个使用各种计时器的应用程序，并且我有一个更改时间的编辑文本。我想添加一个功能，在输入一定数量的字符后自动插入冒号或句点，因为更改时间的语法是特定的（它必须是 XX:XX.X）

我一直在玩它，当我尝试更改 editText 文本时它只会给我一个错误。当我尝试输入时出现错误。

我复制并粘贴了我在此处找到的一些代码并对其进行了更改以满足我的需要/

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++;     
    }
});

这是我得到的错误：

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

Answer 1

解决此问题的一种方法是在代码中放置一个类级别的标志。当您将要调用 setText() 时设置标志并在之后清除它。然后，在 afterTextChanged() 的开头，检查你的标志。像这样的：

 @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 提供了更好的方法来做到这一点。不过我不知道是不是。