Question

我有2个EditText + 2个TextWatcher，一个EditText影响另一个。我很挣扎，并且不知道如何避免StackOverFlow错误，

为什么edit_stezenie_ldl.removeTextChangedListener（手表）还不行？它应该停止这个TextWatcher。

 @Override
public void onFocusChange(View v, boolean hasFocus) {
     watch = 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) {
            if( edit_stezenie_ldl.getText().toString().length()==0) {
                edit_stezenie_ldl2.setText(null);
            }
            else {

                String x  = edit_stezenie_ldl.getText().toString();
                Double xy = Double.parseDouble(x) / (36.8);
                Double rounded = round(xy, 2);
                String wynik = rounded.toString();
                edit_stezenie_ldl2.setText(wynik);

            }
        }
        @Override
        public void afterTextChanged(Editable s) {

        }
    };
    watch2 = 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) {
            if( edit_stezenie_ldl2.getText().toString().length()==0) {
                edit_stezenie_ldl.setText("");
            }
            else {

                String x  = edit_stezenie_ldl2.getText().toString();
                Double xy = Double.parseDouble(x) / (36.8);
                Double rounded = round(xy, 2);
                String wynik = rounded.toString();
                edit_stezenie_ldl.setText(wynik);
            }
        }
        @Override
        public void afterTextChanged(Editable s) {
        }
    };

    if(v==edit_stezenie_ldl && hasFocus){
             edit_stezenie_ldl2.removeTextChangedListener(watch2);
             edit_stezenie_ldl.addTextChangedListener(watch);
    }
    else if(v==edit_stezenie_ldl2 && hasFocus){

            edit_stezenie_ldl.removeTextChangedListener(watch);
            edit_stezenie_ldl2.addTextChangedListener(watch2);

    }
}

Answer 1

removeTextChangedListener()不会删除TextWatcher，因为它与添加侦听器时的watch对象不同，因为每次{{1}时都会重新定义TextWatcher }} 叫做。因此，不会删除任何侦听器，并且在每次焦点更改时，都会添加新的侦听器，当发生文本更改时，所有侦听器都会相互调用，以StackOverflowError结束。

我建议在onFocusChange()之外的某个位置实例化两个TextWatcher对象，这样它们只会被创建一次。

或者，您只能在onFocusChange()：

时实例化侦听器

null

2 EditText + 2 TextWatcher - stackoverflow错误

1 个答案: