根据另一个EditText更改EditText

我是Android开发新手。我有两个EditText，我试图在输入时自动根据ET2更改ET1的值，并根据ET1自动更改ET2的值。根据另一个EditText更改EditText

它们的总和必须是200.所以如果我想在ET1中键入56，当我输入5时，ET2应该显示195.当我加6时，ET2应该显示144（200-56）。一切都应该发生，而重点仍然放在ET1上。

scoreWe.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
     @Override 
     public void onFocusChange(View v, boolean hasFocus) { 
      if (v.hasFocus()) { 
       scoreYou.addTextChangedListener(null); 
       scoreWe.addTextChangedListener(new TextWatcher() { 
        @Override 
        public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

        } 

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

        } 

        @Override 
        public void afterTextChanged(Editable s) { 
         int scoreW; 
         try { 
          scoreW = Integer.parseInt(scoreWe.getText().toString()); 
         } catch (NumberFormatException e) { 
          scoreW = 0; 
         } 
         int scoreY = 200 - scoreW; 
         String scY = Integer.toString(scoreY); 
         scoreYou.setText(scY); 
        } 
       }); 
      } 
     } 
    });

scoreYou.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
     @Override 
     public void onFocusChange(View v, boolean hasFocus) { 
      if (v.hasFocus()) { 
       scoreWe.addTextChangedListener(null); 
       scoreYou.addTextChangedListener(new TextWatcher() { 
        @Override 
        public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

        } 

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

        } 

        @Override 
        public void afterTextChanged(Editable s) { 
         int scoreY; 
         try { 
          scoreY = Integer.parseInt(scoreYou.getText().toString()); 
         } catch (NumberFormatException e) { 
          scoreY = 0; 
         } 
         int scoreW = 200 - scoreY; 
         String scW = Integer.toString(scoreW); 
         scoreWe.setText(scW); 
        } 
       }); 
      } 
     } 
    });

这些都是2个OnFocusChangeListeners，以后我试着输入一些在任何EditTexts的，应用立即崩溃。日志：

09-18 16:50:22.362 17764-17764/com.example.dvido.bela E/AndroidRuntime: FATAL EXCEPTION: main 
                    Process: com.example.dvido.bela, PID: 17764 
                    java.lang.NullPointerException: Attempt to invoke interface method 'void android.text.TextWatcher.beforeTextChanged(java.lang.CharSequence, int, int, int)' on a null object reference 
                     at android.widget.TextView.sendBeforeTextChanged(TextView.java:7941) 
                     at android.widget.TextView.setText(TextView.java:4242) 
                     at android.widget.TextView.setText(TextView.java:4199) 
                     at android.widget.EditText.setText(EditText.java:84) 
                     at android.widget.TextView.setText(TextView.java:4174) 
                     at com.example.dvido.bela.InputGame$1$1.afterTextChanged(InputGame.java:89) 
                     at android.widget.TextView.sendAfterTextChanged(TextView.java:8007) 
                     at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:10168) 
                     at android.text.SpannableStringBuilder.sendAfterTextChanged(SpannableStringBuilder.java:1043) 
                     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:560) 
                     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:492) 
                     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:491) 
                     at android.text.method.NumberKeyListener.onKeyDown(NumberKeyListener.java:121) 
                     at android.widget.TextView.doKeyDown(TextView.java:6098) 
                     at android.widget.TextView.onKeyDown(TextView.java:5911) 
                     at android.view.KeyEvent.dispatch(KeyEvent.java:2640) 
                     at android.view.View.dispatchKeyEvent(View.java:9234) 
                     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
                     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
                     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
                     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
                     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
                     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
                     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
                     at com.android.internal.policy.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:2395) 
                     at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1727) 
                     at android.app.Activity.dispatchKeyEvent(Activity.java:2725) 
                     at android.support.v7.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:543) 
                     at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:53) 
                     at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.dispatchKeyEvent(AppCompatDelegateImplBase.java:312) 
                     at com.android.internal.policy.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2310) 
                     at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4127) 
                     at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4089) 
                     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) 
                     at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) 
                     at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) 
                     at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3787) 
                     at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669) 
                     at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3844) 
                     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) 
                     at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) 
                     at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) 
                     at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669) 
                     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) 
                     at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) 
                     at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) 
                     at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3820) 
                     at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3981) 
                     at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2253) 
                     at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1874)

09-18 16：50：36.917 17764-17764/com.example.dvido.bela I /过程：发送信号。 PID：17764 SIG：9

来源

2016-09-14 Coelacanth

那么你的logcat的说，当你的主线程/应用程序被阻止？ –

你是什么意思被封锁？应用程序未响应？或坠毁？ – SripadRaj

我最好的猜测是由于文本更改的监听器在同时调用两个edittext视图。

尝试在ET2的焦点上禁用ET1的Text changed listener，反之亦然。做这样的事情

禁用scoreWe框TextChanged监听

scoreYou.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
    @Override 
    public void onFocusChange(View v, boolean hasFocus) { 
     if (v.hasFocus()) { 
      scoreWe.addTextChangedListener(null); // ADD THIS LINE 
      scoreYou.addTextChangedListener(new TextWatcher(){}); // Add and Implement this line also 
      //do rest of your logic 
     } 
    } 
});

禁用scoreYou框TextChanged监听

scoreWe.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
    @Override 
    public void onFocusChange(View v, boolean hasFocus) { 
     if (v.hasFocus()) { 
      scoreYou.addTextChangedListener(null); // ADD THIS LINE 
      scoreYou.addTextChangedListener(new TextWatcher(){}); // Add and Implement this line also 
      //do rest of your logic 
     } 
    } 
});

来源

2016-09-14 12:55:52 SripadRaj

它的工作，但只是第一次。如果我将光标移动到ET2然后回到ET1，文本将不会更改，因为侦听器被禁用，所以我必须重新设置它。 – Coelacanth

@Coelacanth我添加了代码。请检查更新后的答案。将其他监听器设置为空后，您必须重新设置监听器。那会做这项工作。试着让我知道。 – SripadRaj

我已经改变了我的代码，但仍然没有。我已经在上面添加了它。感谢您的帮助。 – Coelacanth

根据另一个EditText更改EditText

回答

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