Question

我正计划实施复活节彩蛋，以通过alertdialog更改 API ，但是目前，在更改url端点并提交后，它将保存在共享首选项中，但是接下来当我保存它时，它确实将其保存在共享的首选项中，但未反映在应用程序中。如何使它每次更改时都按预期适用于我的apiendpoint：

Alertdialog，它会在5次点击时触发：

    myimage.setOnClickListener(new View.OnClickListener() {
                  @Override
                  public void onClick(View v) {
                      long time= System.currentTimeMillis();


                      //if it is the first time, or if it has been more than 3 seconds since the first tap ( so it is like a new try), we reset everything
                      if (startMillis==0 || (time-startMillis> 3000) ) {
                          startMillis=time;
                          count=1;
                      }
                      //it is not the first, and it has been  less than 3 seconds since the first
                      else{ //  time-startMillis< 3000
                          count++;
                      }

                      if (count==5) {
                          final AlertDialog dialogBuilder = new AlertDialog.Builder(LoginActivity.this).create();
                          LayoutInflater inflater = LoginActivity.this.getLayoutInflater();
                          View dialogView = inflater.inflate(R.layout.custom_dialog, null);

                          final EditText editText = (EditText) dialogView.findViewById(R.id.edt_comment);
                          Button submitButton = (Button) dialogView.findViewById(R.id.buttonSubmit);
                          Button cancelButton = (Button) dialogView.findViewById(R.id.buttonCancel);
                          Button resetButton = (Button) dialogView.findViewById(R.id.buttonReset);
                          editText.setTextColor(getResources().getColor(R.color.black,null));
                          if(SharedPreferencesHelper.getSomeStringValue(getApplicationContext()) != null) {
                              editText.setText( SharedPreferencesHelper.getSomeStringValue(getApplicationContext()));
                          }

                          cancelButton.setOnClickListener(new View.OnClickListener() {
                              @Override
                              public void onClick(View view) {

                                  dialogBuilder.dismiss();
                              }
                          });
                          submitButton.setOnClickListener(new View.OnClickListener() {
                              @Override
                              public void onClick(View view) {
                                  //save the endpoint value in shared preferences
SharedPreferencesHelper.setSomeStringValue(getApplicationContext(),editText.getText().toString());


                                  dialogBuilder.dismiss();
                              }
                          });
                          resetButton.setOnClickListener(new View.OnClickListener() {
                              @Override
                              public void onClick(View v) {
                                  SharedPreferencesHelper.setSomeStringValue(getApplicationContext(),BuildConfig.BASE_URL);

                                  dialogBuilder.dismiss();

                              }
                          });

                          dialogBuilder.setView(dialogView);
                          dialogBuilder.setCanceledOnTouchOutside(false);
                          dialogBuilder.show();
                      }
                  }



        });

这是我的 sharedpreferenceshelper ：

public class SharedPreferencesHelper {

    private static final String APP_SETTINGS = "APP_SETTINGS";


    // properties
    private static final String SOME_STRING_VALUE = "SOME_STRING_VALUE";
    // other properties...


    private SharedPreferencesHelper() {}

    private static SharedPreferences getSharedPreferences(Context context) {
        return context.getSharedPreferences(APP_SETTINGS, Context.MODE_PRIVATE);
    }

    public static String getSomeStringValue(Context context) {
        return getSharedPreferences(context).getString(SOME_STRING_VALUE , null);
    }

    public static void setSomeStringValue(Context context, String newValue) {
        final SharedPreferences.Editor editor = getSharedPreferences(context).edit();
        editor.putString(SOME_STRING_VALUE , newValue);
        editor.apply();
    }

}

最后，这是我的Apiendpoint class：

final class ApiEndPoint {
 private static String NEW_URL = SharedPreferencesHelper.getSomeStringValue(MyApp.getAppContext());
    static final String ENDPOINT_SERVER_LOGIN = NEW_URL
            + "/service-myverification-link/v1/link/verify";

    private ApiEndPoint() {
        // This class is not publicly instantiable
    }
}

对于上面的代码，我想知道如何使 NEW_URL 链接更具动态性，好像它坚持第一次保存的值，此后不会更改。由于：

，我需要将此链接保持静态

 @Override
    public Single<LoginResponse> doServerLoginApiCall(LoginRequest request) {
            return Rx2AndroidNetworking.post(ApiEndPoint.ENDPOINT_SERVER_LOGIN)
                    .doNotCacheResponse()
                    .addBodyParameter(request)
                    .build()
                    .getObjectSingle(LoginResponse.class);

    }

您知道如何解决此问题，以便每次在 NEW_URL 中使用新值而不是第一次存储的值时都更新该链接吗？

Answer 1

您将需要使用onSharedPreferenceChangeListener

 SharedPreferencesHelper.getSharedPreferences(context).registerOnSharedPreferenceChangeListener(
  new SharedPreferences.OnSharedPreferenceChangeListener() {
    public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
       if(key.equals("SOME_STRING_VALUE")){
          NEW_URL = prefs.getString("SOME_STRING_VALUE" , null);
       }
  }
});

Answer 2

为什么每次都不发送Url作为参数：

@Override
    public Single<LoginResponse> doServerLoginApiCall(LoginRequest request, String url) {
            return Rx2AndroidNetworking.post(url)
                    .doNotCacheResponse()
                    .addBodyParameter(request)
                    .build()
                    .getObjectSingle(LoginResponse.class);
    }

方法调用：

doServerLoginApiCall(request, SharedPreferencesHelper.getSomeStringValue(getApplicationContext()) + ENDPOINT);

Answer 3

更改

final class ApiEndPoint {
 private static String NEW_URL = SharedPreferencesHelper.getSomeStringValue(MyApp.getAppContext());
    static final String ENDPOINT_SERVER_LOGIN = NEW_URL
            + "/service-myverification-link/v1/link/verify";

    private ApiEndPoint() {
        // This class is not publicly instantiable
    }
}

到

final class ApiEndPoint {

    public static String newURL(Context context) {
        return SharedPreferencesHelper.getSomeStringValue(context) + "/service-myverification-link/v1/link/verify";
    }

    private ApiEndPoint() {
        // This class is not publicly instantiable
    }
}

并使用ApiEndpoint.newURL(this);

对其进行调用

如何更新从共享首选项保存的静态上下文值？

3 个答案: