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[Android] Ganti runtime ART dan Dalvik via ADB

ART is a new Android runtime being introduced experimentally in the 4.4 release KitKat. This is a preview of work in progress in KitKat. It is available for the purpose of obtaining early developer and partner feedback. - Android developers
Android Recovery

 Bisa dikatakan bahwa ART ini masih belum rilis dan masih dalam tahap pengembangan. Namun runtime ini sudah tersedia di Android KitKat. Saya sudah pernah mencoba runtime ini pada Moto G saya, dimana masih ada beberapa bug yang membuat saya berpindah kembali ke Dalvik.

Mengapa saya menulis ini ? Sedikit cerita, pagi hari ini saya mengalami soft brick gegara pindah ke ART, dimana HP saya cuma terkunci di lock-screen dan ketika dibuka, beberapa detik kemudian masuk kembali ke lock-screen gegara ada crash pada com.systemui-nya. Setelah bingung mencari cara agar bisa masuk ke Settings untuk kembali ke mode Dalvik, saya akhirnya terpikirkan untuk menggantinya lewat ADB. Caranya cukup simpel dan hanya untuk yang sudah di ROOT saja.

Pastikan anda mempunyai koneksi ke smartphone anda untuk melakukan koneksi ADB. Saya kebetulan mempunyai WiFi ADB yang bisa membuka koneksi ADB melalui jaringan WiFi. Kabel USB sudah saya coba dan tidak bisa pada keadaan normal. Jika anda ingin menggunakan kabel USB, coba jalankan pada mode fastboot, cara ini belum saya coba, karena tadi sudah bisa dikembalikan lewat WiFi.

Langsung saja buka program ADB di komputer anda yang bisa diunduh di sini dan ikuti cara berikut :
  1. Pada kasus saya, jika anda melakukan akses melalui WiFi, smartphone anda akan memiliki IP Address sendiri, langsung saja tembak IP nya dengan mengetikan adb connect 192.168.xxx.xxx diisi sesuai dengan IP anda.
  2. Tunggu sampai ada tulisan connected ke blablabla.. Brarti device anda sudah siap.
  3. Masuk ke shell dengan cara ketikkan adb shell 
  4. Seperti yang sudah saya bilang tadi, cara ini membutuhkan device yang sudah di ROOT. Langkah selanjutnya ketikkan su
  5. Jika anda menunggu lama untuk masuk ke root, coba buka lock screenya, siapa tahu aplikasi Super User di smarthpone sedang memberikan konfirmasi akses root. Jika ya, langsung disetujui saja.
  6. Jika sudah berhasil masuk ke root, ditandai dengan adanya tulisan root pada command line.
    Root mode di ADB
  7. Masuk ke direktori /data/property dengan mengetikan cd /data/property dan buka isi dari persist.sys.dalvik.vm.lib dengan mengetikkan cat persist.sys.dalvik.vm.lib
  8. Lihat isinya, jika berisi libart.so brarti anda sedang pada mode ART. 
  9. Anda bisa langsung menggantinya dengan Dalvik dengan mengetikkan echo libdvm.so > persist.sys.dalvik.vm.lib
    Ganti ART ke Dalvik
  10. Coba cek lagi dengan mengetikkan cat persist.sys.dalvik.vm.lib apakah sudah berisi dengan libdvm.so. 
  11. Sudah ? silahkan reboot kembali smartphone anda, dan berharap semuanya kembali normal seperti smartphone saya tadi :)
  12. Jika ingin kembali ke mode ART, ganti menjadi libart.so
Good Luck :)
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