Android Studio 共享首选项总是返回默认值

Question

所以我试图在我的主要活动之前弹出一个登录或注册页面。我的后端工作但共享首选项将无法访问，即使正确的值在运行时存储在对象中。

这是我尝试读取值的主要片段

sharedPreferences = getSharedPreferences("app",MODE_PRIVATE);
        if(sharedPreferences.getString("logged","false").equals("false")){
            Intent intentMain = new Intent(getApplicationContext(), Registration.class);
            startActivity(intentMain);
            finish();
        }

这是我的登录组件：

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_log_in);

        textViewRegisterNow = findViewById(R.id.registerText);
        textInputEditTextPassword = findViewById(R.id.password);
        textInputEditTextEmail = findViewById(R.id.email);
        textViewError = findViewById(R.id.error);
        progressBar = findViewById(R.id.loading);
        sharedPreferences = getSharedPreferences("app", MODE_PRIVATE);
        if(sharedPreferences.getString("logged","false").equals("true")){
            Intent intentMain = new Intent(getApplicationContext(), MainActivity.class);
            startActivity(intentMain);
            finish();
        }

        buttonSubmit = findViewById(R.id.submit);
        buttonSubmit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                progressBar.setVisibility(View.VISIBLE);
                textViewError.setVisibility(View.GONE);
                email = textInputEditTextEmail.getText().toString();
                password = textInputEditTextPassword.getText().toString();

                RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
                String url ="";

                StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
                        new Response.Listener<String>() {
                            @Override
                            public void onResponse(String response) {
                                progressBar.setVisibility(View.GONE);
                                try {
                                    JSONObject jsonObject = new JSONObject(response);
                                    String status = jsonObject.getString("status");
                                    String message = jsonObject.getString("message");
                                    if(status.equals("success")){
                                        name = jsonObject.getString("name");
                                        email = jsonObject.getString("email");
                                        apiKey = jsonObject.getString("apiKey");
                                        SharedPreferences.Editor editor = sharedPreferences.edit();
                                        editor.putString("logged,", "true");
                                        editor.putString("name,", name);
                                        editor.putString("email,", email);
                                        editor.putString("apiKey,", apiKey);
                                        editor.apply();
                                        Intent intentMain = new Intent(getApplicationContext(), MainActivity.class);
                                        startActivity(intentMain);
                                        finish();
                                    }else{

                                    }
                                } catch (JSONException e) {
                                    e.printStackTrace();
                                }
                            }
                        }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        progressBar.setVisibility(View.GONE);
                        textViewError.setText(error.getLocalizedMessage());
                        textViewError.setVisibility(View.VISIBLE);
                    }
                }){
                    protected Map<String, String> getParams(){
                        Map<String, String> paramV = new HashMap<>();
                        paramV.put("email", email);
                        paramV.put("password", password);
                        return paramV;
                    }
                };
                queue.add(stringRequest);

            }
        });

我几乎浏览了这里的每一个线程，但没有任何效果。有人有想法吗？

Answer 1

您必须使用与保存时使用的密钥完全相同的密钥来获取保存的值。
在这里你保存它使用

editor.putString("logged,", "true");

并且密钥被记录，以逗号结尾。

在这里你可以使用它

sharedPreferences.getString("logged","false");

密钥是logged没有逗号。
你必须像下面这样改变它：

sharedPreferences.getString("logged,","false");

最好避免使用硬编码密钥来防止出现此类错误。有道理吗？