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在輸入時更改EditText中的字符？ Android

2013-12-08 27 views
3

我目前有一個使用排序計時器的應用程序，我有一個編輯文本可以改變時間。我想添加一個功能，在輸入特定數量的字符後自動插入冒號或句點，因爲更改時間的語法是特定的（它必須是XX：XX.X）在輸入時更改EditText中的字符？ Android

我已經一直在玩它，它只會給我一個錯誤，當我嘗試改變editText文本。當我嘗試輸入時出現錯誤。

我複製並粘貼一些代碼，我在這裏找到，並改變了它適合我的需要/

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++;  
    } 
});

這是錯誤我得到：

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

來源

2013-12-08 user3078867

+1

錯誤是什麼？使用TextChangedListener時需要注意的一件事是遞歸 - 當你設置文本時，確保你沒有觸發另一個onTextChanged（）。 –

+0

增加了logcat，不知道這是否有幫助 – user3078867

+0

是的，這有幫助。你正在獲得無限遞歸。 –

回答

2

一個你能解決這個問題的方法是在你的代碼中放置一個類級別的標誌。當你打算調用setText（）時設置標誌並在之後清除它。然後，在afterTextChanged（）開頭，檢查你的標誌。像這樣的東西：

@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++;  
}

也許谷歌提供了一個更好的方式來做到這一點。不過，我不知道。

來源

2013-12-08 01:59:39

+0

太棒了！它工作的很好，唯一的一點是它在插入冒號或句點後將光標設置爲EditText的開頭。 – user3078867

+0

你可以使用setSelection（）重新定位遊標。 –

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