Question

My app uses ACRA for error reporting, and I’ve got a couple of reports from my device with the error: Can only use lower 16 bits for requestCode.. Google shows this error occurring when using startActivityForResult, but I’ve searched my code a few times and I”m not calling that anywhere.

I’m pretty confused and am wondering how this is impacting users (interestingly enough, the Crash Reports beta doesn’t show any errors at all).

Anyone else run into this?

java.lang.RuntimeException: Unable to resume activity {com.myapp/com.myapp.MyActivity}:  
java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2120)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:957)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode
at android.support.v4.app.g.startActivityForResult(SourceFile:690)
at com.android.e.a.a(Unknown Source)
at com.android.e.e.a(Unknown Source)
at com.android.o.e.a(Unknown Source)
at com.android.o.b.a(Unknown Source)
at com.android.framework.context.d.a(Unknown Source)
at com.android.framework.context.d.onResume(Unknown Source)
at com.android.Kiwi.onResume(Unknown Source)
at com.myapp.MyActivity.onResume(SourceFile)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1150)
at android.app.Activity.performResume(Activity.java:3832)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2110)
... 10 more
java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode
at android.support.v4.app.g.startActivityForResult(SourceFile:690)
at com.android.e.a.a(Unknown Source)
at com.android.e.e.a(Unknown Source)
at com.android.o.e.a(Unknown Source)
at com.android.o.b.a(Unknown Source)
at com.android.framework.context.d.a(Unknown Source)
at com.android.framework.context.d.onResume(Unknown Source)
at com.android.Kiwi.onResume(Unknown Source)
at com.myapp.MyActivity.onResume(SourceFile)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1150)
at android.app.Activity.performResume(Activity.java:3832)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2110)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:957)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)

Can somebody help me on this?

Answer 1

From the FragmentActivity Source code:

/**
* Modifies the standard behavior to allow results to be delivered to fragments.
* This imposes a restriction that requestCode be <= 0xffff.
*/
@Override
public void startActivityForResult(Intent intent, int requestCode) {
    if (requestCode != -1 && (requestCode&0xffff0000) != 0) {
        throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
    }
    super.startActivityForResult(intent, requestCode);
}

It seems that your request code can only go upto 0xffff, which translates into 65535 for us base 10 obsessed humans.