如何在 android 中的多个编辑文本上添加文本观察器？

Question

我有一个 activity，其中包含两个编辑文本，并且在那个 activity 中有一个 TextWatcher，它是单独实现的。我想制作一个 class 来实现 TextWatcher 并在该编辑文本中实现 TextWatcher 。我怎样才能做到这一点代码：-

private TextWatcher getmWatcher = 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) {

    }

    @Override
    public void afterTextChanged(Editable s) {
        checkFieldsForEmpty();
    }
};
private TextWatcher mWatcher = 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) {

    }

    @Override
    public void afterTextChanged(Editable s) {
        checkFieldsForEmpty();
    }
};
m_InputMobile = (EditText) findViewById(R.id.input_mobile);// finding Id of Mobile Number edit text
    m_InputMobile.addTextChangedListener(getmWatcher);
    m_InputPassword = (EditText) findViewById(R.id.input_password);// finding Id of assword editText
    m_InputPassword.setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD);// defining password edit Tect Input type

Answer 1

只需创建一个 TextWatcher 对象并将其传递到 addTextChangeListener 中，如下所示：

TextWatcher textWatcher = 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) {

        }

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

    m_InputMobile.addTextChangedListener(textWatcher);

Answer 2

有两种方法可以做到这一点。

第一个

TextWatcher textWatcher = 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) {

        }

        @Override
        public void afterTextChanged(Editable s) {
              if (m_InputMobile.getText().hashCode() == s.hashCode()) {
                  checkFieldsForEmpty();
              }
              else if (m_InputPassword.getText().hashCode() == s.hashCode()) {
                  checkFieldsForEmpty();
              }
        }
    };

m_InputMobile = (EditText) findViewById(R.id.input_mobile);
m_InputMobile.addTextChangedListener(getmWatcher);
m_InputPassword = (EditText) findViewById(R.id.input_password);
m_InputPassword.addTextChangedListener(getmWatcher);

或者做一个客户TextWatcherclass

第二个

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    m_InputMobile = (EditText) findViewById(R.id.input_mobile);
    m_InputMobile.addTextChangedListener(new CustomTextWatcher(m_InputMobile));
    m_InputPassword = (EditText) findViewById(R.id.input_password);
    m_InputPassword.addTextChangedListener(new CustomTextWatcher(m_InputPassword));
}

private class CustomTextWatcher implements TextWatcher {
    private EditText mEditText;

    public CustomTextWatcher(EditText e) { 
        mEditText = e;
    }

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

   }

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

   }

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

有关详细信息，请访问 this 问题。

编码愉快。

Answer 3

多个edittext初始化&设置TextChangedListener

for(int i=0;i<editTexts_ids.length;i++)
{
    editTexts[i] = (EditText)view.findViewById(editTexts_ids[i]);
    editTexts[i].addTextChangedListener(this);

    textInputLayouts[i]= (TextInputLayout)view.findViewById(textInputLayouts_ids[i]);
    //Log.e("EditText["+i+"]",""+editTexts[i].getId());
}

在 afterTextChanged 方法中

@Override 
public void afterTextChanged(Editable editable) {

for(int i=0;i<editTexts_ids.length;i++) // Disable Error AFter Entered Text
     {//not include Mobile Number Name,S/o, Nominee Edittexts
        if (editTexts[i].getText().hashCode() == editable.hashCode())// Checking
        {
            //Mobile Number VAlidation At Runtime
            if(i==11)
            {
                if(Utils.Mobile_NumberValidation(editable.toString()))
                {
                    textInputLayouts[i].setError("");
                    return;
                }
                else
                {
                    textInputLayouts[i].setError("Invalid Mobile Number (should start with 7 or 8 or 9) , Length 10 digits");
                    return;
                }
            }
            if (i == 4) { // for Name
                if(!Utils.Name_Validation(editable.toString())) {
                    textInputLayouts[4].setError("Invalid Person Name (Special Symbols(@,!,$ .etc), DOT (.) are not allowed)");
                    return;
                }else
                {
                    textInputLayouts[4].setError("");
                    return;
                }
            }
            if (i == 5) { //for S/o,D/o,W/o
                if(!Utils.Name_Validation(editable.toString())) {
                    textInputLayouts[5].setError("Invalid Person Name (Special Symbols(@,!,$ .etc), DOT (.) are not allowed)");
                    return;
                }else
                {
                    textInputLayouts[5].setError("");
                    return;
                }
            }

            if (i == 9) { //for S/o,D/o,W/o
                if(!Utils.Name_Validation(editable.toString())) {
                    textInputLayouts[9].setError("Invalid Person Name (Special Symbols(@,!,$ .etc), DOT (.) are not allowed)");
                    return;
                }else
                {
                    textInputLayouts[9].setError("");
                    return;
                }
            }


            if (!editable.toString().trim().isEmpty()) {
                textInputLayouts[i].setError("");
                return;
            }

        }

}

}

如何在 android 中的多个编辑文本上添加文本观察器？

How to add Text Watcher on multiple Edit text in android?

android

android-textwatcher

第一个

第二个