When running a proguard enabled build with the new android navigation component, my fragment class cannot be found. I receive this stack trace:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.myapppackage.path, PID: 24334
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapppackage.path/com.myapppackage.path.MainActivity}: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
Caused by: java.lang.RuntimeException: Exception inflating com.myapppackage.path:navigation/nav_graph line 7
at androidx.navigation.h.a(Unknown Source:124)
at androidx.navigation.c.a(Unknown Source:4)
at androidx.navigation.fragment.NavHostFragment.a(Unknown Source:88)
at android.support.v4.app.g.k(Unknown Source:15)
at android.support.v4.app.m.a(Unknown Source:382)
at android.support.v4.app.m.b(Unknown Source:7)
at android.support.v4.app.m.a(Unknown Source:74)
at android.support.v4.app.m.onCreateView(Unknown Source:216)
at android.support.v4.app.j.a(Unknown Source:4)
at android.support.v4.app.h.a(Unknown Source:2)
at android.support.v4.app.e.onCreateView(Unknown Source:0)
at android.support.v4.app.h.onCreateView(Unknown Source:0)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:780)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.j.b(Unknown Source:23)
at android.support.v7.app.c.setContentView(Unknown Source:4)
at com.myapppackage.path.MainActivity.onCreate(Unknown Source:6)
at android.app.Activity.performCreate(Activity.java:6999)
at android.app.Activity.performCreate(Activity.java:6990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.myapppackage.path.ui.start.StartFragment
at androidx.navigation.fragment.a$a.a(Unknown Source:58)
at androidx.navigation.fragment.a$a.a(Unknown Source:19)
at androidx.navigation.h.a(Unknown Source:16)
at androidx.navigation.h.a(Unknown Source:133)
at androidx.navigation.h.a(Unknown Source:31)
at androidx.navigation.c.a(Unknown Source:4)
at androidx.navigation.fragment.NavHostFragment.a(Unknown Source:88)
at android.support.v4.app.g.k(Unknown Source:15)
at android.support.v4.app.m.a(Unknown Source:382)
at android.support.v4.app.m.b(Unknown Source:7)
at android.support.v4.app.m.a(Unknown Source:74)
at android.support.v4.app.m.onCreateView(Unknown Source:216)
at android.support.v4.app.j.a(Unknown Source:4)
at android.support.v4.app.h.a(Unknown Source:2)
at android.support.v4.app.e.onCreateView(Unknown Source:0)
at android.support.v4.app.h.onCreateView(Unknown Source:0)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:780)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.j.b(Unknown Source:23)
at android.support.v7.app.c.setContentView(Unknown Source:4)
at com.myapppackage.path.MainActivity.onCreate(Unknown Source:6)
at android.app.Activity.performCreate(Activity.java:6999)
at android.app.Activity.performCreate(Activity.java:6990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.ClassNotFoundException: com.myapppackage.path.ui.start.StartFragment
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:453)
E/AndroidRuntime: at androidx.navigation.fragment.a$a.a(Unknown Source:45)
... 38 more
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.myapppackage.path.ui.start.StartFragment" on path: DexPathList[[zip file "/data/app/com.myapppackage.path-yqk9eOoCoeyT3xg78oYcxg==/base.apk"],nativeLibraryDirectories=[/data/app/com.myapppackage.path-yqk9eOoCoeyT3xg78oYcxg==/lib/arm64, /system/lib64, /vendor/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
... 41 more
It says it cannot find the fragment class which is defined in my nav_graph.xml file:
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.myapppackage.path.ui.start.StartFragment
My nav_graph.xml:
<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
app:startDestination="@id/start">
<fragment
android:id="@+id/start"
android:name="com.myapppackage.path.ui.start.StartFragment"
android:label="start_fragment"
tools:layout="@layout/start_fragment" />
</navigation>
As you can see the name of the fragment is set in the xml, this path seems to become invalid after running through proguard.
My only work-around so far is to define each of my fragment class paths as -keepnames in my proguard-rules.pro file. For example:
-keepnames class com.myapppackage.path.ui.start.StartFragment
After this, the obfuscated compile runs fine without crashing.
Although I'm not sure if this is correct, am I doing something wrong? How can we use the new navigation architecture component with our obfuscated builds without defining a rule for each fragment in proguard rules?
I understand this issue may only be a problem right now because the navigation-fragment component is still in alpha.
