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问为什么不能将两个TextWatcher放在一个活动中，用于两个不同的edittext，从而改变彼此的值？
EN

Stack Overflow用户

提问于 2011-10-11 12:18:48

回答 3查看 703关注 0票数 0

在我的应用程序中，有两个EditText和一个TextView。我已经在这两个EditText上设置了Two Textwatcher。基于该EditText中的值，另一个EditText的值被更改，并且它也适用于textView。一切都很好。但是，如果我将另一个Edittext设置为类似于要根据另一个EditText的值进行更改的值，则会出现stackOverflow错误。我不知道我错在哪里。并且我不能将两个EditText的TextWatcher放在一起来改变彼此的值。

请帮帮我。谢谢。代码：

 amountText.setText(""); // TextView
    excludedText.setText(""); // EditText
    includedText.setText(""); // EditText


    includedText.addTextChangedListener(new TextWatcher() {

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

                if(!(includedText.getText().toString().equals("")))
                {
                    double included = Double.parseDouble(includedText.getText().toString());
                    included = roundTwoDecimals(included);
        //          double amountValue = (excluded*15/100);

                    String amt = String.valueOf(roundTwoDecimals(included-(included/1.15)));
                    String excluded = String.valueOf(included/1.15);
                    System.out.println("The Amount is: "+amt);
                    amountText.setText(amt);
                    try{
                        excludedText.setText("");
                        excludedText.setText(excluded); //////// Error Line
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                    }
                }
                else
                {
                    amountText.setText("");
                    excludedText.setText(""); // Error line
                }

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub

        }
    });

    excludedText.addTextChangedListener(new TextWatcher() 
    {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if(!(excludedText.getText().toString().equals("")))
            {
                double excluded = Double.parseDouble(excludedText.getText().toString());
                excluded = roundTwoDecimals(excluded);

                String amt = String.valueOf(roundTwoDecimals(excluded*0.15));
                String included = String.valueOf(roundTwoDecimals(excluded+(excluded*0.15)));
                System.out.println("The Amount is: "+amt);
                amountText.setText(amt);
                includedText.setText(included);
            }
            else
            {
                amountText.setText("");
                includedText.setText("");
            }

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub

        }
    });

下面是我的Logcat：

10-11 09:47:28.288: ERROR/AndroidRuntime(363): FATAL EXCEPTION: main
10-11 09:47:28.288: ERROR/AndroidRuntime(363): java.lang.StackOverflowError
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at     android.text.DynamicLayout.reflow(DynamicLayout.java:261)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.text.DynamicLayout.<init>(DynamicLayout.java:150)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at  android.widget.TextView.makeNewLayout(TextView.java:4851)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.checkForRelayout(TextView.java:5348)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2688)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$1.onTextChanged(GSTActivity.java:73)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$2.onTextChanged(GSTActivity.java:111)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$1.onTextChanged(GSTActivity.java:73)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$2.onTextChanged(GSTActivity.java:111)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$1.onTextChanged(GSTActivity.java:73)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$2.onTextChanged(GSTActivity.java:111)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$1.onTextChanged(GSTActivity.java:73)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$2.onTextChanged(GSTActivity.java:111)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$1.onTextChanged(GSTActivity.java:73)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2556)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.EditText.setText(EditText.java:75)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2531)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at com.project.TaxCalculator.GSTActivity$2.onTextChanged(GSTActivity.java:111)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextView.setText(TextView.java:2691)
10-11 09:47:28.288: ERROR/AndroidRuntime(363):     at android.widget.TextVie

请参考这个日志并帮助我解决它。谢谢。

android

android-layout

android-emulator

android-widget

textwatcher

回答 3

Stack Overflow用户

回答已采纳

发布于 2011-10-11 12:51:02

这是一个stackoverflow的问题，你要去无限循环。

您正在从第二个edittext更新一个edittext的值，反之亦然。

例如:：

当你在第一次编辑文本中输入字符时，它将设置第二次编辑文本的文本，而在第二次编辑文本中，你已经编写了一段代码来设置第一次编辑文本的文本，这样你就会进入无限循环。

编辑

et1 = (EditText)findViewById(R.id.et1);
et2 = (EditText)findViewById(R.id.et2);

OnKeyListener onKeyListener = new OnKeyListener() {

            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                String str = ((EditText)v).getText().toString();
                if(v == et1) {
                    et2.setText(str);
                }else {
                    et1.setText(str);
                }
                return false;
            }
        };
        et1.setOnKeyListener(onKeyListener);
        et2.setOnKeyListener(onKeyListener);

票数 2

Stack Overflow用户

发布于 2011-10-11 15:25:06

您可以尝试将代码放入"afterTextChanged“中，但我认为这将导致相同的无限循环。这就是为什么我不明白为什么这两个输入可以相互依赖，意思是，如果EditText-A改变了ET-B的文本，那么ET-B如何再次改变ET-A中的文本，这没有任何意义。

票数 1

Stack Overflow用户

发布于 2011-10-11 15:37:22

每次在EditText中更改文本时，都会调用TextWatcher (如果定义了它，并且取决于您实现了哪些被覆盖的方法)。因此，根据您想要完成的任务，如果EditText A的文本被编辑，那么TextWatcher将被调用并编辑EditText B的文本，然后TextWatcher调用其相应的TextWatcher，EditText A的文本将被调用...简而言之，这是一种糟糕的做法。

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/7721327

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