你可以使用setOnFocusChangeListener，当焦点改变时，它会检查

        txt_membername.setOnFocusChangeListener(new OnFocusChangeListener() {

        @Override
        public void onFocusChange(View arg0, boolean arg1) {
            if (arg1) {
                //do something
            } else {
                if (txt_membername.getText().toString().length() == 0) {
                    txt_membername
                            .setError("Member name is not empty, Plz!");
                }
            }
        }
    });

尝试使用If ELSE If条件。您可以轻松地验证editText字段。

 if(TextUtils.isEmpty(username)) {
                userNameView.setError("User Name Is Essential");
                return;
         } else  if(TextUtils.isEmpty(phone)) {
                phoneView.setError("Please Enter Your Phone Number");
                return;
            }

使用这段简短的代码，您可以删除字符串开头和结尾的空白。如果字符串是“”，则返回消息“error”，否则就是字符串

EditText user = findViewById(R.id.user); 
userString = user.getText().toString().trim(); 
if (userString.matches("")) {
    Toast.makeText(this, "Error", Toast.LENGTH_SHORT).show();
    return; 
}else{
     Toast.makeText(this, "Ok", Toast.LENGTH_SHORT).show();
}

你可以使用setOnFocusChangeListener，当焦点改变时，它会检查

        txt_membername.setOnFocusChangeListener(new OnFocusChangeListener() {

        @Override
        public void onFocusChange(View arg0, boolean arg1) {
            if (arg1) {
                //do something
            } else {
                if (txt_membername.getText().toString().length() == 0) {
                    txt_membername
                            .setError("Member name is not empty, Plz!");
                }
            }
        }
    });

EditText edt=(EditText)findViewById(R.id.Edt);

String data=edt.getText().toString();

if(data=="" || data==null){

 Log.e("edit text is null?","yes");

}

else {

 Log.e("edit text is null?","no");

}

对所有五个编辑文本都这样做吗

if ( (usernameEditText.getText()+"").equals("") ) { 
    // Really just another way
}