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具有两个EditText字段的文本更改监听器

javaandroidandroid-edittext
3
在我的项目中，我有两个带有文字更改监听器的EditText字段。
    final EditText Field1 = (EditText) findViewById(R.id.Field1);
    final EditText Field2 = (EditText) findViewById(R.id.Field2);

    Field1.addTextChangedListener(new TextWatcher() {

        @Override
        public void afterTextChanged(Editable s) {}

        @Override
        public void beforeTextChanged(CharSequence s, int start,
                                      int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start,
                                  int before, int count) {
            if(Field1.getText().toString().equals("")){

            }
            else{
                double number1 = Double.valueOf(Field1.getText().toString());
                double number2 = Math.round((number1 * 10) / 25);
                Field2.setText(String.valueOf(number2));
            }
        }
    });

    Field2.addTextChangedListener(new TextWatcher() {

        @Override
        public void afterTextChanged(Editable s) {}

        @Override
        public void beforeTextChanged(CharSequence s, int start,
                                      int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start,
                                  int before, int count) {
            if(Field2.getText().toString().equals("")){

            }
            else{

            }

        }
    });

当我在Field1中输入数字，它会显示在Field2中，这个没问题。但是当我在Field2中放置以下代码时：
            if(Field2.getText().toString().equals("")){

            }
            else{
                double number2 = Double.valueOf(Field2.getText().toString());
                double number1 = Math.round((number2 * 20) / 35);
                Field1.setText(String.valueOf(number1));
            }

当我在Field2中输入一个数字时，应用程序会崩溃。

堆栈跟踪：

31972-31972/arkstudioapps.textchangelistener E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: arkstudioapps.textchangelistener, PID: 31972
java.lang.StackOverflowError
        at android.text.MeasuredText.addStyleRun(MeasuredText.java:164)
        at android.text.MeasuredText.addStyleRun(MeasuredText.java:204)
        at android.text.StaticLayout.generate(StaticLayout.java:281)
        at android.text.DynamicLayout.reflow(DynamicLayout.java:284)
        at android.text.DynamicLayout.<init>(DynamicLayout.java:170)
        at android.widget.TextView.makeSingleLayout(TextView.java:6134)
        at android.widget.TextView.makeNewLayout(TextView.java:6032)
        at android.widget.TextView.checkForRelayout(TextView.java:6571)
        at android.widget.TextView.setText(TextView.java:3813)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$2.onTextChanged(MainActivity.java:62)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$2.onTextChanged(MainActivity.java:62)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$2.onTextChanged(MainActivity.java:62)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$2.onTextChanged(MainActivity.java:62)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at android.widget.TextView.setText(TextView.java:3671)
        at android.widget.EditText.setText(EditText.java:80)
        at android.widget.TextView.setText(TextView.java:3646)
        at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
        at android.widget.TextView.sendOnTextChanged(TextView.java:7408)
        at android.widget.TextView.setText(TextView.java:3816)
        at an

我该如何解决这个问题？

提前致谢。

1
当应用程序崩溃时，你的日志记录器(Logcat)显示了什么？ - Bryan Herbst
.textchangelistener E/AndroidRuntime﹕ FATAL EXCEPTION: main - Follie
这不是错误。请发布完整的堆栈跟踪。 - Amsheer
3个回答
4

1.

当您尝试在两个EditText上使用TextWatcher时，通常不建议在onTextChanged或其他TextWatcher方法中更改文本。 您必须避免由于在EditText中更改文本而陷入无限循环。

如果您只需要执行一次计算和其他字段的文本更新，当您键入其中一个时，请尝试以下操作：

在Activity中，定义一个布尔变量来控制在TextWather的方法中调用setText，并防止我们陷入无限循环：

private boolean keepChangingText = true;

然后按照以下方式更新您的TextWatchers：
Field1.addTextChangedListener(new TextWatcher() {

    @Override
    public void afterTextChanged(Editable s) {
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start,
        int count, int after) {
    }

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

        if (Field1.getText().toString().equals("")) {

        }
        else {
            double number1 = Double.valueOf(Field1.getText().toString());
            double number2 = Math.round((number1 * 10) / 25);
            if (keepChangingText) {
                keepChangingText = false;
                Field2.setText(String.valueOf(number2));
            } else {
                keepChangingText = true;
            }
        }
    }
});

Field2.addTextChangedListener(new TextWatcher() {

    @Override
    public void afterTextChanged(Editable s) {
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start,
        int count, int after) {
    }

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

        if (Field2.getText().toString().equals("")) {

        }
        else {
            double number2 = Double.valueOf(Field2.getText().toString());
            double number1 = Math.round((number2 * 20) / 35);
            if (keepChangingText) {
                keepChangingText = false;
                Field1.setText(String.valueOf(number1));
            } else {
                keepChangingText = true;
            }

        }
    }
});

2.

Double.valueOf(Field1.getText().toString());

如果您输入一些无效的文本，可能会失败。

有没有其他的解决方案来改变文本字段？ - Follie
我不确定你需要什么，但我认为你将不得不包含一些条件，在onTextChanged方法中决定是调用setText还是什么都不做，以避免无限循环。 - Berťák
应该将 Double.valueOf(Field1.getText().toString()); 放在 try 和 catch 语句块中。 - Thecarisma
0
final EditText Field1 = (EditText) findViewById(R.id.Field1);
final EditText Field2 = (EditText) findViewById(R.id.Field2);

Field1.addTextChangedListener(new TextWatcher() {

    @Override
    public void afterTextChanged(Editable s) {}

    @Override
    public void beforeTextChanged(CharSequence s, int start,
                                  int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start,
                              int before, int count) {
if (getCurrentFocus() == Field1)
{
        if(Field1.getText().toString().equals("")){

        }
        else{
            double number1 = Double.valueOf(Field1.getText().toString());
            double number2 = Math.round((number1 * 10) / 25);
            Field2.setText(String.valueOf(number2));
        }
    }
}
});

Field2.addTextChangedListener(new TextWatcher() {

    @Override
    public void afterTextChanged(Editable s) {}

    @Override
    public void beforeTextChanged(CharSequence s, int start,
                                  int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start,
                              int before, int count) {
    if (getCurrentFocus() == Field2)
    {
        if(Field2.getText().toString().equals("")){

        }
        else{

            double number2 = Double.valueOf(Field2.getText().toString());
            double number1 = Math.round((number2 * 20) / 35);
            Field1.setText(String.valueOf(number1));

        }

    }
  }
});

你可以试试这个，它可能对你有帮助。

0

尝试使用这段代码，它是在EditText上设置setontouchListener的简单代码

EditText edtName,edtAddress;
TextView tvaData;
editTextName.setOnTouchListener(new OnTouchListener() {         
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            ChangeText(); 
            return false;
        }
    }); 
   edtAddress.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            ChangeText(); 
            return false;
        }
    }); 
private void ChangeText{ 
tvaData.setText("Abc");
}
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