Android studio 1.1.0 setting minifyEnabled true causing issues with app

Question

Here's my gradle.build file

defaultConfig {

    minSdkVersion 15
    targetSdkVersion 21
    versionCode 2
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

Proguard-rules.pro file

-keepclassmembers class * extends de.greenrobot.dao.AbstractDao {
    public static java.lang.String TABLENAME;
}
-keep class **$Properties

-dontwarn com.squareup.**
-dontwarn okio.**
-dontwarn retrofit.**
-dontwarn org.joda.time.**

I have one of the java class as

public class Endpoints {
    public final static String GET_ENDPOINT = "MY_ENDPOINT";
}

which I use in my retrofit restadapter as

 RestAdapter restAdapter = new RestAdapter.Builder()
            .setEndpoint(Endpoints.GET_ENDPOINT)
            .setLogLevel(RestAdapter.LogLevel.NONE)
            .setConverter(new GsonConverter(gson))
            .setClient(new OkClient(BusProvider.getClientInstance()))
            .build();

Now when minifiyEnabled is false, the entire code works just fine but I set minifyEnabled true, the network call doesn't happen. My app calls this endpoint as soon as it is launched but the network logs dont show the network request being made. Can someone tell me whats wrong here?

Answer 1

Proguard doesn't play well with many of the libraries I used in my project.

For gson I added the proguard rules given by the gson team at http://google-gson.googlecode.com/svn/trunk/examples/android-proguard-example/proguard.cfg

You need to change

-keep class com.google.gson.examples.android.model.** { *; }

to

-keep class com.your.package.name.your.models.** { *; }

For retrofit you need to add

-dontwarn retrofit.**
-keep class retrofit.** { *; }
-keepattributes Signature
-keepattributes Exceptions
-keepclasseswithmembers class * {
    @retrofit.http.* <methods>;
}

Taken from here https://github.com/square/retrofit/issues/117

For joda library I added

-keep class org.joda.time.** { *; }
-dontwarn org.joda.time.**

For otto you need to add

-dontwarn com.squareup.**
-keepclassmembers class ** {
    @com.squareup.otto.Subscribe public *;
    @com.squareup.otto.Produce public *;
}

Taken from here https://github.com/StephenAsherson/Android-OttoSample/blob/master/proguard-project.txt

I also added

-keep class com.squareup.okhttp.** { *; }

Before using these configuration changes proguard trimmed my app from 3.4 mb to 2 mb. After using these changes it shrinks it to 3.2 mb so I am just going to go with minifyEnabled false.