Question

我正在尝试创建一个登录表单，您可以在其中从微调器中选择一个项目，然后需要在文本字段中输入正确的代码才能继续操作。这就是我得到的。

Spinner schoolList = findViewById(R.id.schoolList);

    ArrayAdapter<String> schoolListAdapter = new ArrayAdapter<String>(CreateAccount.this, android.R.layout.simple_spinner_dropdown_item, schools);

    schoolList.setAdapter(schoolListAdapter);
private String[] schools = new String[]{
        "School 1",
        "School 2,
        "School 3"
};


private String[] schoolCodeArray = new String[] {
        "password1",
        "password2",
        "password3"
};

我知道您可以检查School 1 = password1等等，但是此列表将非常长，因此我正在寻找更好的方法。诸如获取所选学校的索引并检查该索引是否等于schoolCodeArray中的索引并与文本字段中的内容匹配的东西。希望您能理解我的需求。我感谢所有帮助！

Answer 1

如果您应该有两个微调器，一个用于学校，另一个用于密码，那么考虑项目顺序也可能有所不同。使您的逻辑灵活。为此，请创建一个HashMap，其中将学校作为密钥，并将密码作为值。

HashMap<String, String> credentialMap = new HashMap<String, String>();
credentialMap.put("School 1","Password 1")
credentialMap.put("School 2","Password 2")

一旦用户从两个微调器中选择了一个项目，然后需要执行一些按钮操作来验证它。为此

    loginButton.setOnClickListener(new View.OnClickListener(){
         public void onClick(View v){
            if(credentialMap.containsKey(schoolSpinnerItem)){
              if(credentialMap.get(schoolSpinnerItem).equals(passwordSpinnerItem)){
                // Login success
              }
              else{
                 // Login failed
              }
            }
         }
     });

Answer 2

我想您已通过EditText（）初始化了findViewById，因此请尝试将其放入onItemSelected中：

    String[] schools = new String[]{
            "School 1",
            "School 2",
            "School 3"
    };


    final String[] schoolCodeArray = new String[] {
            "password1",
            "password2",
            "password3"
    };

    Spinner schoolList = findViewById(R.id.schoolList);
    ArrayAdapter<String> schoolListAdapter = new ArrayAdapter<String>(CreateAccount.this, android.R.layout.simple_spinner_dropdown_item, schools);
    schoolList.setAdapter(schoolListAdapter);

    schoolList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            if (schoolCodeArray[position].equals(editText.getText().toString().trim())) {
                // your code here
            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });

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2 个答案: