Question

我正在制作一个Android程序，由于stackoverflow错误导致它失败。我附上了我的代码。我正在使用android studio。我相信它是因为addTextChangedListener而循环，但我无法理解它为什么这样做。

我的代码：

    rb1 = (RadioButton) findViewById(R.id.radioButtonCFM);
    rb2 = (RadioButton) findViewById(R.id.radioButtonAC);

    rb1.setOnClickListener(new RadioGroup.OnClickListener() {
         public void onClick(View v) {
             EditText e1 = (EditText) findViewById(R.id.editText);
             String sUsername1 = e1.getText().toString();
             if (TextUtils.isEmpty(sUsername1)) {
                 e1.setError("The item cannot be empty.");
                 return;
             }

             EditText e2 = (EditText) findViewById(R.id.editText2);
             String sUsername2 = e2.getText().toString();
             if (TextUtils.isEmpty(sUsername2)) {
                 e2.setError("The item cannot be empty.");
                 return;
             }

             EditText e3 = (EditText) findViewById(R.id.editText3);
             String sUsername3 = e3.getText().toString();
             if (TextUtils.isEmpty(sUsername3)) {
                 e3.setError("The item cannot be empty.");
                 return;
             }

             e1.addTextChangedListener(new TextWatcher() {

                 public void afterTextChanged(Editable s) {
                 }

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

                 public void onTextChanged(CharSequence s, int start,
                                           int before, int count) {
                     EditText e1 = (EditText)findViewById(R.id.editText);
                     EditText e2 = (EditText)findViewById(R.id.editText2);
                     EditText e3 = (EditText)findViewById(R.id.editText3);
                     volume = Double.parseDouble(e1.getText().toString());
                     cfm = Double.parseDouble(e2.getText().toString());
                     ac = Double.parseDouble(e3.getText().toString());
                     TextView t1 = (TextView) findViewById(R.id.editText3);
                     volume = Double.parseDouble(e1.getText().toString());
                     cfm = Double.parseDouble(e2.getText().toString());
                     ac = cfm * 60 / volume;
                     t1.setText(Double.toString((double) Math.round(ac * 100000) / 100000));
                 }
             });


             e2.addTextChangedListener(new TextWatcher() {

                 public void afterTextChanged(Editable s) {
                 }

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

                 public void onTextChanged(CharSequence s, int start,
                                           int before, int count) {
                     EditText e1 = (EditText)findViewById(R.id.editText);
                     EditText e2 = (EditText)findViewById(R.id.editText2);
                     EditText e3 = (EditText)findViewById(R.id.editText3);
                     volume = Double.parseDouble(e1.getText().toString());
                     cfm = Double.parseDouble(e2.getText().toString());
                     ac = Double.parseDouble(e3.getText().toString());
                     TextView t1 = (TextView) findViewById(R.id.editText3);
                     volume = Double.parseDouble(e1.getText().toString());
                     cfm = Double.parseDouble(e2.getText().toString());
                     ac = cfm * 60 / volume;
                     t1.setText(Double.toString((double) Math.round(ac * 100000) / 100000));
                 }
             });

         }});

     rb2.setOnClickListener(new RadioGroup.OnClickListener() {
         public void onClick(View v) {
             EditText e1 = (EditText)findViewById(R.id.editText);
             String sUsername1 = e1.getText().toString();
             if(TextUtils.isEmpty(sUsername1)) {
                 e1.setError("The item cannot be empty.");
                 return;
             }

             EditText e2 = (EditText)findViewById(R.id.editText2);
             String sUsername2 = e2.getText().toString();
             if(TextUtils.isEmpty(sUsername2)) {
                 e2.setError("The item cannot be empty.");
                 return;
             }

             EditText e3 = (EditText)findViewById(R.id.editText3);
             String sUsername3 = e3.getText().toString();
             if(TextUtils.isEmpty(sUsername3)) {
                 e3.setError("The item cannot be empty.");
                 return;
             }

             e1.addTextChangedListener(new TextWatcher() {

                 public void afterTextChanged(Editable s) {
                 }

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

                 public void onTextChanged(CharSequence s, int start,
                                           int before, int count) {
                     EditText e1 = (EditText)findViewById(R.id.editText);
                     EditText e2 = (EditText)findViewById(R.id.editText2);
                     EditText e3 = (EditText)findViewById(R.id.editText3);
                     volume = Double.parseDouble(e1.getText().toString());
                     cfm = Double.parseDouble(e2.getText().toString());
                     ac = Double.parseDouble(e3.getText().toString());

                     TextView t2 = (TextView)findViewById(R.id.editText2);
                     volume = Double.parseDouble(e1.getText().toString());
                     ac = Double.parseDouble(e3.getText().toString());
                     cfm = ac * volume / 60;
                     t2.setText(Double.toString((double) Math.round(cfm * 100000) / 100000));
                 }
             });

             e3.addTextChangedListener(new TextWatcher() {

                 public void afterTextChanged(Editable s) {
                 }

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

                 public void onTextChanged(CharSequence s, int start,
                                           int before, int count) {
                     EditText e1 = (EditText)findViewById(R.id.editText);
                     EditText e2 = (EditText)findViewById(R.id.editText2);
                     EditText e3 = (EditText)findViewById(R.id.editText3);
                     volume = Double.parseDouble(e1.getText().toString());
                     cfm = Double.parseDouble(e2.getText().toString());
                     ac = Double.parseDouble(e3.getText().toString());

                     TextView t2 = (TextView)findViewById(R.id.editText2);
                     volume = Double.parseDouble(e1.getText().toString());
                     ac = Double.parseDouble(e3.getText().toString());
                     cfm = ac * volume / 60;
                     t2.setText(Double.toString((double) Math.round(cfm * 100000) / 100000));
                 }
             });

         }
     });
     }

Answer 1

正在观看R.id.editText3输入的TextWatcher正在修改R.id.editText2的文字，而R.id.editText3正在修改onTextChanged(...)。通过它，您将获得对{{1}}的无限调用。

Answer 2

尝试在您的活动中添加以下内容：

@Override

public boolean onKeyDown(int keyCode, KeyEvent event)
    {
        if ((keyCode == KeyEvent.KEYCODE_BACK))
        {

            finish();

        }
        return super.onKeyDown(keyCode, event);
    }

Answer 3

您反复调用findViewById（）。只需创建所有视图字段和＆＃34;找到＆＃34;它们在setContentView（）之后的onCreate（）中。

我注意到你打电话了

TextView t1 = (TextView) findViewById(R.id.edittext3);

不需要复制指向同一视图的指针。简化您的代码并确保所有变量都指向正确的目标，并且TextWatchers不会触发自己。

由于java.lang.StackOverflowError，Android应用程序失败

3 个答案: