Question

我参与了存储和获取共享首选项。当用户注册时，如果注册成功，那么这些值必须存储在他的个人资料中，除了我的个人资料类。我不知道为什么会得到默认值给我一个建议。

提前致谢。

请再说一遍我在这里更新了代码。

  public class Register extends Activity  {


/**
 * Defining layout items.
 **/

EditText mFirstName, mLastName, mUsername, mMobile, mPassword;
ImageView img_back;
Button btnRegister, mbtnSignIn;
TextView registerErrorMsg;
String jsonresponce=null;
String enteredUsername,enteredPassword,enteredfname,enteredlname,enteredmobile;
String REGISTER_URL;
ProgressDialog pd;
private SharedPreferences sharedpreferences;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_register);
    mFirstName = (EditText) findViewById(R.id.fname);
    mLastName = (EditText) findViewById(R.id.lname);
    mUsername = (EditText) findViewById(R.id.username);
    mMobile = (EditText) findViewById(R.id.mobie);
    mPassword = (EditText) findViewById(R.id.pword);
    btnRegister = (Button) findViewById(R.id.register);
    mbtnSignIn = (Button) findViewById(R.id.signin);
    registerErrorMsg = (TextView) findViewById(R.id.tv);
    sharedpreferences = getSharedPreferences("a2a", Context.MODE_PRIVATE);
    img_back = (ImageView) findViewById(R.id.imageback);

    img_back.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent i_backtohome = new Intent(Register.this, HomeActivity.class);
            startActivity(i_backtohome);
        }
    });
    mbtnSignIn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i_backtosignin = new Intent(Register.this, Signin.class);
            startActivity(i_backtosignin);

        }
    });


    btnRegister.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            enteredUsername = mUsername.getText().toString();
            Log.e("username",enteredUsername);

            enteredPassword = mPassword.getText().toString();
            Log.e("username",enteredPassword);

            enteredfname = mFirstName.getText().toString();
            Log.e("username",enteredfname);

            enteredlname = mLastName.getText().toString();
            Log.e("username",enteredlname);

            enteredmobile = mMobile.getText().toString();
            Log.e("username",enteredmobile);

            REGISTER_URL = "http://ffhhhjkhjgh/register.php?UserName="+enteredUsername+"&FirstName="+enteredfname+"&LastName="+enteredlname+"&Mobile="+enteredmobile+"&Pass="+enteredPassword;

            // REGISTER_URL = REGISTER_URL + enteredUsername + enteredPassword + enteredfname + enteredlname + enteredmobile;
            Log.e("finalurl",REGISTER_URL);

            if (enteredUsername.equals("") || enteredfname.equals("") || enteredlname.equals("")
                    || enteredmobile.equals("") || enteredPassword.equals("")) {

                Toast.makeText(Register.this, "All Fields are Mandatory", Toast.LENGTH_LONG).show();

                return;
            }
            if (mUsername.length() <= 1 || mPassword.length() <= 1) {

                Toast.makeText(Register.this, "Username or password length must be greater than one", Toast.LENGTH_LONG).show();

                return;

            }
            new AsyncDataClass().execute();

        }
    });
}

  class AsyncDataClass extends AsyncTask<String, String, String> {

   /* String fName;
    String lName;
      public AsyncDataClass(){
        this.fName = enteredfname;
         this.lName = enteredlname;
      }*/

      @Override
      protected void onPreExecute() {
          super.onPreExecute();
          pd = new ProgressDialog(Register.this);
          pd.setMessage("Loading...");
          pd.setCanceledOnTouchOutside(false);
          pd.show();
          }

      @Override
      protected String doInBackground(String... params) {

          try{
              URL url = new URL(REGISTER_URL);
              String res;

              HttpURLConnection conn = (HttpURLConnection) url.openConnection();

              conn.setRequestMethod("POST");
              conn.setDoOutput(true);
              conn.setDoInput(true);
              conn.connect();
              res = conn.getResponseMessage();
              Log.e("res", res);


              InputStream in = conn.getInputStream();
              BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
              StringBuilder sb = new StringBuilder();
              String line = null;

              try{
                  while ((line = reader.readLine()) != null) {
                      sb.append(line + "\n");
                  }
                  in.close();
                  reader.close();
                  jsonresponce = sb.toString();
                  Log.e("jsondata", jsonresponce);
              }catch (Exception e) {
                  e.printStackTrace();
              }finally {
                  try {
                      conn.disconnect();
                  }
                  catch (Exception e) {
                      e.printStackTrace();
                  }
              }

          }catch (Exception e){
              e.printStackTrace();
          }
          return jsonresponce;
      }

      @Override
      protected void onPostExecute(String s) {

          pd.dismiss();

                if("SUCCESS".equals(jsonresponce)){
                    Toast.makeText(getApplicationContext(),jsonresponce,Toast.LENGTH_SHORT).show();
                    SharedPreferences sharedpreferences = getApplicationContext().getSharedPreferences("a2a", Context.MODE_PRIVATE);
                    SharedPreferences.Editor editor = sharedpreferences.edit();
                    editor.putString("enteredfname", enteredfname);
                    editor.putString("enteredlname", enteredlname);
                    editor.commit();
                }else{
                    Toast.makeText(getApplicationContext(),jsonresponce,Toast.LENGTH_SHORT).show();
                }

          super.onPostExecute(s);
      }
  }
    }

Answer 1

您正在使用getSharedPreferences和getDefaultSharedPreferences。

这样做 -

SharedPreferences sharedpreferences = getApplicationContext().getSharedPreferences("a2a", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString("enteredfname", enteredfname);
editor.putString("enteredlname", enteredlname);
editor.commit();

后来 -

SharedPreferences preferences = getApplicationContext().getSharedPreferences("a2a", Context.MODE_PRIVATE);
String value = preferences.getString("enteredfname", "enteredfname");

Answer 2

尝试这样的事情..创建一个类

public class SharedPreferenceCustom {
  private Context mContext;
  private String defValue = "";

  public SharedPreferenceCustom(Context context) {
    this.mContext = context;
  }

  public void setSharedPref(String inputKey, Object inputValue) {
    final SharedPreferences sharedPreferences = mContext.getSharedPreferences("a2a", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putString(inputKey, String.valueOf(inputValue));
    editor.apply();

    }

  public String getSharedPref(String inputKey) {
    SharedPreferences sharedPreferences = mContext.getSharedPreferences("a2a", Context.MODE_PRIVATE);
    return sharedPreferences.getString(inputKey, defValue);
 }
}

并在需要时致电

通过

打电话

   SharedPreferenceCustom sp = new SharedPreferenceCustom(mContext);
   sp.setSharedPref("KEY", "VALUE");
   // or
   sp.getSharedPref("KEY");

Answer 3

您已使用SharedPreferences.Editor存储值，然后在另一个Activity中使用PreferenceManager来检索值。这就是为什么你总是得到默认值。

PreferenceManager用于存储特定应用的首选项。它们用于存储应用程序设置，其中SharedPreferences用于保存数据或值以在应用程序内部工作。它们不能用于应用程序设置。这是两个单独的文件，但都使用Preferences类。

您需要使用SharedPreferences对象来检索值而不是PreferenceManager。您已在AnotherActivity内创建了名为“preferences”的SharedPreferences对象。只需使用此SharedPreferences对象来检索您想要的数据，如下所示：

String value = preferences.getString("key", def_value);

Answer 4

为了节省价值：

  @Override
          protected void onPostExecute(String s) {

              pd.dismiss();

                    if("SUCCESS".equals(jsonresponce)){
                        Toast.makeText(getApplicationContext(),jsonresponce,Toast.LENGTH_SHORT).show();
                         SharedPreferences sharedpreferences = getSharedPreferences("a2a", Context.MODE_PRIVATE);
                        SharedPreferences.Editor editor = sharedpreferences.edit();

                        editor.putString("enteredfname", enteredfname);
                        editor.putString("enteredlname", enteredlname);
                        editor.commit();

                    }else{
                        Toast.makeText(getApplicationContext(),jsonresponce,Toast.LENGTH_SHORT).show();
                    }

              super.onPostExecute(s);
          }
      }

要追溯价值：

 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_myprofile, container, false);

    mfname = (EditText)rootView.findViewById(R.id.fname);
    mlname = (EditText)rootView.findViewById(R.id.lname);
    mcontact = (EditText)rootView.findViewById(R.id.contact);
    mpassword = (EditText)rootView.findViewById(R.id.editpass);
    SharedPreferences sharedpreferences = getSharedPreferences("a2a", Context.MODE_PRIVATE)

    value = sharedpreferences.getString("enteredfname", "enteredfname")

    mfname.setText(value);
    return rootView;
}

android中的共享首选项显示未找到默认值

4 个答案: