Beberapa issue saat mengaktifkan Proguard(1).

Sekedar catatan pengingat, siapa tahu bermanfaat bagi pemirsa sekalian. he3x.. Karena beberapa waktu lalu mengalami masalah setelah mengaktifkan ProGuard.

1. Depencency pada Google Play Service.

Jika ini terjadi, maka project anda tidak akan bisa di build. Biasanya ini sering terjadi pada package com.google.android.gms jika anda menggunakan google play service dan google analytics. Solusinya anda harus meng-exclude package com.google.android.gms.

<pre class="">compile('com.google.android.gms:play-services-maps:7.3.0') {
    exclude group: 'com.google.android.gms'
}

compile 'com.google.android.gms:play-services-analytics:7.3.0'

2. Duplicate resource files

Error ini juga menyebabkan project anda tidak dapat di build. Penyebab error ini adalah adanya duplikasi nama file di dalam project Anda entah di dalam package anda sendiri, atau dalam library yang Anda gunakan. Sehingga anda harus rajin metani ha3x.. rasain..

Note: there were 110 duplicate class definitions.
      (http://proguard.sourceforge.net/manual/troubleshooting.html#duplicateclass)
Warning:can't write resource [.readme] (Duplicate zip entry [classes.jar:.readme])
Warning:can't write resource [META-INF/LICENSE.txt] (Duplicate zip entry [commons-lang3-3.2.1.jar:META-INF/LICENSE.txt])
Warning:can't write resource [META-INF/NOTICE.txt] (Duplicate zip entry [commons-lang3-3.2.1.jar:META-INF/NOTICE.txt])
Warning:can't write resource [META-INF/LICENSE.txt] (Duplicate zip entry [commons-io-1.3.2.jar:META-INF/LICENSE.txt])
Warning:can't write resource [META-INF/NOTICE.txt] (Duplicate zip entry [commons-io-1.3.2.jar:META-INF/NOTICE.txt])
Warning:can't write resource [.readme] (Duplicate zip entry [classes.jar:.readme])
:app:proguardAppRelease FAILED
Error:Execution failed for task ':app:proguardAppRelease'.
> java.io.IOException: Can't write [/Users/me/Projects/myProject/app/build/intermediates/classes-proguard/app/release/classes.jar] (Can't read [/Users/me/Projects/myProject/app/build/intermediates/exploded-aar/myProject/mySubProject/unspecified/jars/libs/retrofit-1.3.0.jar(;;;;;;!META-INF/MANIFEST.MF)] (Duplicate zip entry [b/a/a.class == retrofit-1.3.0.jar:retrofit/android/AndroidApacheClient.class]))

Saya pernah mengalaminya dan Alhamdulillah solved dengan cara meng-exclude file2 yang terindikasi terjadi duplikasi:

android {
     packagingOptions { 
         exclude 'META-INF/LICENSE.txt' 
         exclude 'META-INF/NOTICE.txt' 
     }
 }

http://stackoverflow.com/questions/16357959/proguard-fails-with-cant-write-resource-meta-inf-manifest-mf-duplicate-zip

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