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具有2個EditText字段的文本更改偵聽器

[英]Text Change Listener with 2 EditText Fields

 原文  2015-07-15 13:30:05  5   3    java/ android/ android-edittext

問題描述

在我的項目中，我有2個EditText字段和Text Change Listener。 

    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{

            }

        }
    });

當我在Field1中輸入數字時，它就會出現在Field2中，效果很好。 但是當我將這段代碼放在Field2中時： 

            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));
            }

我在Field2中輸入了一個數字，表示應用程序崩潰了。 堆棧跟蹤： 

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

我怎樣才能解決這個問題？

提前致謝。

3 個解決方案

解決方案1
 4 已采納  2015-07-15 13:41:33

1。

當您嘗試在兩個EditText上使用TextWatcher時，通常不建議在onTextChanged或其他TextWatcher的方法中更改文本。 您必須避免由於更改EditTexts中的文本而陷入無限循環。

如果您只需要執行一次計算和其他字段的文本更新，請在鍵入時進行以下嘗試：

在您的Activity中，定義一個布爾變量，該變量將控制TextWather方法中對setText的調用，這將阻止我們進入無限循環： 

private boolean keepChangingText = true;

然后像這樣更新您的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());

如果您鍵入一些無效的文本 ，可能會失敗。

解決方案2
 0  2015-07-15 13:57:45

嘗試使用此代碼，這是在EditText簡單代碼上執行setontouchListener來完成的 

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");
}

解決方案3
 0  2016-08-11 11:52:38

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));

        }

    }
  }
});

試試這個可能對您有幫助

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