Error: HashMap cannot be cast to class of android studio

akhil-vijayan · March 11, 2016, 2:31pm

Okkz i will try too i think same mistake here

akhil-vijayan · March 11, 2016, 3:22pm

Below is the error when i moved the backendless.initApp() to just above the code where i am using the backendless code. I think i am making an error in initializing it. I used

Backendless.initApp(this,APP_ID, ANDROID_SECRET_KEY, “v1”);This is the error:

03-11 20:49:21.867 2944-2960/? E/AndroidRuntime﹕ FATAL EXCEPTION: Thread-165
Process: com.example.akhil.quizit, PID: 2944
java.lang.ClassCastException: com.example.akhil.quizit.GKPaper$2 cannot be cast to android.content.Context
at com.backendless.ContextHandler.setContext(ContextHandler.java:31)
at com.backendless.Backendless.initApp(Backendless.java:127)
at com.example.akhil.quizit.GKPaper$2.run(GKPaper.java:96)
at java.lang.Thread.run(Thread.java:818)

mark-piller · March 11, 2016, 3:29pm

The first argument for the initApp call must be an instance of android.content.Context. You can use the activity object there.

akhil-vijayan · March 11, 2016, 3:54pm

which activity object??

mark-piller · March 11, 2016, 4:04pm

Your Android activity

akhil-vijayan · March 11, 2016, 4:06pm

i have many activity in m project. Are u saying that i should use the activiy name in which i am coding the backendless?
Backendless.initApp(GKPaper.class,App_id, secret key, “v1”);GKPaper is the class name where i am coding this

mark-piller · March 11, 2016, 4:13pm

Use your main activity object. Not class, but object. Here’s an example:

github.com

Backendless/Android-SDK/blob/master/samples/UserService/userservicedemo/src/com/backendless/examples/userservice/demo/MainActivity.java

/*
 * ********************************************************************************************************************
 *  <p/>
 *  BACKENDLESS.COM CONFIDENTIAL
 *  <p/>
 *  ********************************************************************************************************************
 *  <p/>
 *  Copyright 2012 BACKENDLESS.COM. All Rights Reserved.
 *  <p/>
 *  NOTICE: All information contained herein is, and remains the property of Backendless.com and its suppliers,
 *  if any. The intellectual and technical concepts contained herein are proprietary to Backendless.com and its
 *  suppliers and may be covered by U.S. and Foreign Patents, patents in process, and are protected by trade secret
 *  or copyright law. Dissemination of this information or reproduction of this material is strictly forbidden
 *  unless prior written permission is obtained from Backendless.com.
 *  <p/>
 *  ********************************************************************************************************************
 */

package com.backendless.examples.userservice.demo;

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akhil-vijayan · March 11, 2016, 4:18pm

In this link “this” is used in the Backendless.initApp and not the object that u r specifying

akhil-vijayan · March 11, 2016, 4:19pm

How to specify the object?

mark-piller · March 11, 2016, 4:23pm

In that link “this” is referring to the activity where the code is executed.

akhil-vijayan · March 11, 2016, 4:25pm

ya i also used the same…
but facing that error
“cannot be cast to android.content.Context”

mark-piller · March 11, 2016, 4:33pm

Perhaps this will help: http://stackoverflow.com/questions/2002288/static-way-to-get-context-on-android

akhil-vijayan · March 11, 2016, 4:43pm

whats this…??
why should i refer to the context as i am using “this”

mark-piller · March 11, 2016, 4:49pm

Because “this” you’re using is obviously not an instance of android.content.Context.

akhil-vijayan · March 11, 2016, 5:11pm

I have done the above change but still the error remains the same…

Backendless.initApp(MyApplication.getAppContext(),APP_id, Secret_key, “v1”);

mark-piller · March 12, 2016, 7:59am

ClassCastException? Could you show complete stack trace please?

akhil-vijayan · March 12, 2016, 3:30pm

http://support.backendless.com/public/attachments/b0cbbd60d58048cb43e5f0d68dda1d88.jpg</img>This is the error…

mark-piller · March 12, 2016, 4:28pm

Make sure to use the following API for all related entities:

Backendless.Data.mapTableToClass( “name-of-the-table-where-you-keep-GK-objects”. GK.class )

Regards,
Mark

system · March 12, 2016, 5:43pm

I used it in only 1 place…