lionscribe lionscribe - 1 month ago 19
Android Question

DexGuard and Vector Drawables

I am using DexGuard to compile my app. My app uses vector drawables. I have all the settings correct, and it works correctly, both in the debug version, and when I use Proguard for the release version. It only crashes in the release version when using DexGuard. So I know it's a DexGuard issue.
I am using DexGuard v7.0 and I cannot update due to license restrictions.
I have added


-keepresourcefiles "res/drawable/**"
-keep class android.support.v7.** { *; }

to my dexguard file for testing purposes and for clearer stacktraces, so we know that is not the issue.
It crashes with following stacktrace;

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lionscribe.myapp/com.lionscribe.elist.main.MainActivity}: android.content.res.Resources$NotFoundException: File res/drawable/abc_ic_ab_back_material.xml from drawable resource ID #0x7f020018
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471)
at android.app.ActivityThread.access$900(ActivityThread.java:175)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.content.res.Resources$NotFoundException: File res/drawable/abc_ic_ab_back_material.xml from drawable resource ID #0x7f020018
at android.content.res.Resources.loadDrawable(Resources.java:3440)
at android.content.res.Resources.getDrawable(Resources.java:1917)
at o.?.?(:354)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(:193)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(:181)
at android.support.v7.widget.AppCompatDrawableManager.checkVectorDrawableSetup(:689)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(:186)
at android.support.v7.widget.TintTypedArray.getDrawableIfKnown(:77)
at android.support.v7.app.AppCompatDelegateImplBase.<init>(:83)
at android.support.v7.app.AppCompatDelegateImplV7.<init>(:146)
at android.support.v7.app.AppCompatDelegateImplV11.<init>(:28)
at android.support.v7.app.AppCompatDelegateImplV14.<init>(:41)
at android.support.v7.app.AppCompatDelegate.create(:193)
at android.support.v7.app.AppCompatDelegate.create(:173)
at android.support.v7.app.AppCompatActivity.getDelegate(:511)
at android.support.v7.app.AppCompatActivity.onCreate(:71)
at o.hF.onCreate(:29)
at com.lionscribe.elist.main.MainActivity.onCreate(:121)
at android.app.Activity.performCreate(Activity.java:5451)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2377)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471) 
at android.app.ActivityThread.access$900(ActivityThread.java:175) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:146) 
at android.app.ActivityThread.main(ActivityThread.java:5602) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:515) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
at dalvik.system.NativeStart.main(Native Method) 
Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #17: invalid drawable tag vector
at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:986)
at android.graphics.drawable.Drawable.createFromXml(Drawable.java:930)
at android.content.res.Resources.loadDrawable(Resources.java:3436)
at android.content.res.Resources.getDrawable(Resources.java:1917) 
at o.?.?(:354) 
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(:193) 
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(:181) 
at android.support.v7.widget.AppCompatDrawableManager.checkVectorDrawableSetup(:689) 
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(:186) 
at android.support.v7.widget.TintTypedArray.getDrawableIfKnown(:77) 
at android.support.v7.app.AppCompatDelegateImplBase.<init>(:83) 
at android.support.v7.app.AppCompatDelegateImplV7.<init>(:146) 
at android.support.v7.app.AppCompatDelegateImplV11.<init>(:28) 
at android.support.v7.app.AppCompatDelegateImplV14.<init>(:41) 
at android.support.v7.app.AppCompatDelegate.create(:193) 
at android.support.v7.app.AppCompatDelegate.create(:173) 
at android.support.v7.app.AppCompatActivity.getDelegate(:511) 
at android.support.v7.app.AppCompatActivity.onCreate(:71) 
at o.hF.onCreate(:29) 
at com.lionscribe.elist.main.MainActivity.onCreate(:121) 
at android.app.Activity.performCreate(Activity.java:5451) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2377) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471) 
at android.app.ActivityThread.access$900(ActivityThread.java:175) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:146) 
at android.app.ActivityThread.main(ActivityThread.java:5602) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:515) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
at dalvik.system.NativeStart.main(Native Method) 


Upon following the code, I follow that when using DexGuard, the method
loadDrawableFromDelegates
(called from
getDrawable
) in
android.support.v7.widget.AppCompatDrawableManager
is returning null. Therefore
getDrawable
continues and calls
ContextCompat.getDrawable
, which does not support Vectors in pre-Lollipop devices, and it returns null with an
invalid drawable tag vector
log, and therefore causes a
ResourcesNotFoundException
.

When using the debug version,
loadDrawableFromDelegates
does return a Drawable, therefore
ContextCompat.getDrawable
does not get called, and everything works fine.
Does anyone have any ideas how to avoid this. I Googled, and there are others who had similiar issues, but they were mostly appcompat vector setting issues, not DexGuard.

Answer

Well after 12 hours of work, I finally figured it out, and all it was is 1 line in the DexGuard config. You do not need any of the settings I mentioned above. all you need is

-keepresourcexmlattributenames vector/**

Reason for this is that the AppCompat library does not look for the attributes of the vector, like viewportWidth by id, but it uses the actual atribute name. Dexguard by default strips the name, thus it never found the value. By adding the above line, you are telling DexGuard to leave the attribute names for all vector files.
I hope this saves others of much heartache.

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