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Editorial Team
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Asked: 2026-06-09T01:43:16+00:00

I have an application on google play. I made a new version with a

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I have an application on google play.
I made a new version with a higher versioncode and different name.
Tested it on my own android device (v2.3.3) and an emulator (v4.0.3).
No errors so far, so i put the update on the market.

Now the first error reports come in!!!!! (see below)
I dont know what it means.

The new update was a little change in the permissions and i removed two libraries (jumptap SDK and jumptap adapter for admob mediation).
The removed permissions were:

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

Leaving these two for admob ads:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

The error code:

 java.lang.RuntimeException: Unable to start activity
 ComponentInfo{com.masked.app/com.masked.app.mainjava}:java.lang.NullPointerException
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2705)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2721)
 at android.app.ActivityThread.access$2300(ActivityThread.java:132)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2071)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loop(Looper.java:123)
 at android.app.ActivityThread.main(ActivityThread.java:4669)
 at java.lang.reflect.Method.invokeNative(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:521)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:876)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634)
 at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.NullPointerException
 at com.masked.app.mainjava.onCreate(mainjava.java:53)
 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2669)

At line 132 there is “adblockcheck();” that can be found here
How to prevent ad blocker from blocking ads on an app ;
line 123 is also within this code.

At line 53 a mediaplayer is started (mp.start();) with a starting sound.

What is the problem exactly, and why don’t i get the error on my devices?
This is my first error report through google play, is one error problematic or are there more developers that experience errors and don’t always care about them?

Full Mainjava.java can be downloaded here http://homepage.tudelft.nl/78u5u/main.zip

EDIT:
R.raw.start is a mp3 file.

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1 Answer

  1. Editorial Team

    It’s going to be hard to tell what is really going on without seeing (at least) your whole onCreate() method in com.masked.app.mainjava. It sounds like you didn’t initialize your media player.

    If anyone else is having trouble with crash reports, this is an AMAZING way to get better feedback on Android is this project: http://code.google.com/p/acra/

    EDIT:

    Your problem is almost certainly caused by the a codec issue (your device cannot play the given resource due to its filetype/format). What type of sound file is it?

    You can get around your issue by changing this block:

    if (startsoundint == 1){
    MediaPlayer mp = MediaPlayer.create(Mainjava.this, R.raw.start);
    if (mp != null) // null check
    {
        mp.start();
    }
}

    And yes, this means it’s probably not a new bug, unless you changed the sound file.

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