onClickListener 调用 TextWatcher：非法前向引用

Question

我正在研究单选按钮，我希望每个 RadioButton 在每个 onClick 中重新调用 TextWatcher 来更新我的 TextView 但它没有没用。

所有这些代码都在 Fragment 中，而我只有 一个 Activity

单选按钮:

View.OnClickListener radio1Clicked = v ->{
        radioButton1.addTextChangedListener(textWatcher); //error under textWatcher : Illegal forward reference
        //More Operations Running here ... };

View.OnClickListener radio2Clicked = v ->{ 
        radioButton2.addTextChangedListener(textWatcher)};//error under textWatcher: Illegal forward reference
        //More Operations Running here ... };

View.OnClickListener radio3Clicked = v ->{ 
        radioButton2.addTextChangedListener(textWatcher)};//error under textWatcher: Illegal forward reference
        //More Operations Running here ... };

文字观察者：

    TextWatcher textWatcher= new TextWatcher(){
        //Declarations and other stuff
                // RadioButton1
                if (radioButton1.isChecked()) {
                    basePrintable = 50;
                    calculatePcs = (int) (50 / sqIn);
                    iPieces.setText(String.valueOf(calculatePcs ));
                    if (!checker)//check Switch {
                        iPriceOut.setText("150.0");
                    } else if (checker) //re-check Switch{
                        iPriceOut.setText("50.0");
                    }
                }
                // RadioButton1
                if (radioButton1.isChecked()) {
                    basePrintable = 50;
                    calculatePcs = (int) (50 / sqIn);
                    iPieces.setText(String.valueOf(calculatePcs ));
                    if (!checker)//check Switch {
                        iPriceOut.setText("150.0");
                    } else if (checker) //re-check Switch{
                        iPriceOut.setText("50.0");
                    }
                }
                // RadioButton2
                if (radioButton1.isChecked()) {...}
                // RadioButton3
                if (radioButton1.isChecked()) {...}


     basePcs = Integer.parseInt(iPieces.getText().toString());
                baseSheet = 
     Integer.parseInt(iShit.getText().toString());
                basePrice = 
     Double.parseDouble(iPriceOut.getText().toString());
    }

我知道它可以被称为因为我已经在这里做了：（而且它有效）

public void onCheckedChanged(CompoundButton switchInput, boolean isChecked) {
        switchInput.addTextChangedListener(size);
        if (!isChecked) {
            switchInput.setText("...");
            radioButton1.setText("...");
            radioButton2.setText("...");
            radioButton3.setText("...");
        } else {
            switchInput.setText("...");
            radioButton1.setText("...");
            radioButton2.setText("...");
            radioButton3.setText("...");
        }
    }

我是一个彻头彻尾的菜鸟，只会跟着教程为自己拼接这个应用程序。这是我必须解决的最后一个问题，因为其他的都或多或少地完成了。

感谢您的帮助

Answer 1

我认为问题在于您不能引用内部单击的对象，而是使用传递的视图

View.OnClickListener o1 = v ->{
        iOpt1.addTextChangedListener(size); //error: Illegal Forward Reference
        if (iOpt1.isChecked()) {
            iOpt2.setChecked(false);
            iOpt3.setChecked(false);
        }
        iOpt1.setChecked(true);
    };

改为

View.OnClickListener o1 = v ->{
        v.addTextChangedListener(size); <--change here //error: Illegal Forward Reference
        if (v.isChecked()) { <--change here
            iOpt2.setChecked(false);
            iOpt3.setChecked(false);
        }
        v.setChecked(true);<--change here
    };

在单击视图时使用 v

Answer 2

我只需要更新或刷新 TextWatcher，方法是将它自己的内容重新分配回注入它的 EditText，这将导致更新并将运行 TextWatcher 因为基本上已经更新了。

 View.OnClickListener o1 = v ->{
        if (iOpt1.isChecked()) {
            iOpt2.setChecked(false);
            iOpt3.setChecked(false);
        }
        iOpt1.setChecked(true);

        //SOLUTION: save the value on where the **TextWatcher** is injected then re-assign the same value you saved

        refesher = iLength.getText().toString();
        iLength.setText(refesher);

        //This will cause an update to the **TextWatcher** and will run the code again

    };

TextWatcher size = new TextWatcher() {...}

这里有更多上下文

public class PrintFragment extends Fragment{

EditText iLength, iHeight;
RadioButton iOpt1, iOpt2, iOpt3;
String refresher;

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    //inflate

    iLength = V.findViewById(R.id.length);
        iHeight = V.findViewById(R.id.height);
        iOpt1 = V.findViewById(R.id.opt1);
        iOpt2 = V.findViewById(R.id.opt2);
        iOpt3 = V.findViewById(R.id.opt3);
        

        iLength.addTextChangedListener(size);
        iHeight.addTextChangedListener(size);
        iOpt1.setOnClickListener(o1);
        iOpt2.setOnClickListener(o2);
        iOpt3.setOnClickListener(o3);
     return;
     }

 View.OnClickListener o1 = v ->{
        if (iOpt1.isChecked()) {
            iOpt2.setChecked(false);
            iOpt3.setChecked(false);
        }
        iOpt1.setChecked(true);
        refesher = iLength.getText().toString();
        iLength.setText(refesher);
    };

TextWatcher size = new TextWatcher() {...}
}

onClickListener 调用 TextWatcher：非法前向引用

onClickListener calls TextWatcher: Illegal forward reference

java

android

onclick

textwatcher