Proguard Missing Type Parameter

proguard Missing type parameter

answer is: use this proguard.cfg

##---------------Begin: proguard configuration common for all Android apps ----------
-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontskipnonpubliclibraryclassmembers
-dontpreverify
-verbose
-dump class_files.txt 
-printseeds seeds.txt 
-printusage unused.txt 
-printmapping mapping.txt 
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

-allowaccessmodification
-keepattributes *Annotation*
-renamesourcefileattribute SourceFile
-keepattributes SourceFile,LineNumberTable
-repackageclasses ''

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider
-keep public class * extends android.app.backup.BackupAgentHelper
-keep public class * extends android.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService
-dontnote com.android.vending.licensing.ILicensingService

# Explicitly preserve all serialization members. The Serializable interface
# is only a marker interface, so it wouldn't save them.
-keepclassmembers class * implements java.io.Serializable {
    static final long serialVersionUID;
    private static final java.io.ObjectStreamField[] serialPersistentFields;
    private void writeObject(java.io.ObjectOutputStream);
    private void readObject(java.io.ObjectInputStream);
    java.lang.Object writeReplace();
    java.lang.Object readResolve();
}

# Preserve all native method names and the names of their classes.
-keepclasseswithmembernames class * {
    native <methods>;
}

-keepclasseswithmembernames class * {
    public <init>(android.content.Context, android.util.AttributeSet);
}

-keepclasseswithmembernames class * {
    public <init>(android.content.Context, android.util.AttributeSet, int);
}

# Preserve static fields of inner classes of R classes that might be accessed
# through introspection.
-keepclassmembers class **.R$* {
  public static <fields>;
}

# Preserve the special static methods that are required in all enumeration classes.
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

-keep public class * {
    public protected *;
}

-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}
##---------------End: proguard configuration common for all Android apps ----------

##---------------Begin: proguard configuration for Gson  ----------
# Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
-keepattributes Signature

# Gson specific classes
-keep class sun.misc.Unsafe { *; }
#-keep class com.google.gson.stream.** { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }

##---------------End: proguard configuration for Gson  ----------

Big thanks to owner this project --> google-gson

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UPD:
google/gson has their example of proguard configuration for android applications.

see on github

They propose to use this template of configuration

##---------------Begin: proguard configuration for Gson  ----------
# Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
-keepattributes Signature

# For using GSON @Expose annotation
-keepattributes *Annotation*

# Gson specific classes
-keep class sun.misc.Unsafe { *; }
#-keep class com.google.gson.stream.** { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }

##---------------End: proguard configuration for Gson  ----------

Caused by java.lang.RuntimeException: Missing type parameter

Well, after changing my TypeToken code, seems it's working.

Non working code:

return GsonBuilder().create().fromJson(
    json,
    object : TypeToken<List<Question>?>() {}.type
)

Working solution:

return GsonBuilder().create().fromJson(
    json,
    TypeToken.getParameterized(List::class.java, Question::class.java).type
)

Proguard Missing type parameter on Samsung device

My solution was to avoid the use of the TypeToken and updating dexguard to the latest version.

For example:

Instead of

new Gson().fromJson(json, new TypeToken<Object>(){}.getType());

use this

new Gson().fromJson(json, Object.class);

I updated an App but its failed. Missing type parameter in ProGuard

I solved my problem with this:

proguard:

-renamesourcefileattribute SourceFile
-keepattributes  Signature,SourceFile,LineNumberTable
-keep public class * extends android.app.Application

java.lang.RuntimeException: Missing type parameter

The class TypeToken requires a type parameter.

Looking at your code, it looks like you should replace

Type listType = new TypeToken() {
}.getType();

with

Type listType = new TypeToken<List<Face>>() {
}.getType();

Gson missing type parameter for ArrayList of objects

You have to add more information to your proguard file:

# Gson uses generic type information stored in a class file when working with fields. 
# Proguard removes such information by default, so configure it to keep all of it.
-keepattributes Signature
-keepattributes EnclosingMethod
-keepattributes InnerClasses
-keepattributes Annotation

# For using GSON @Expose annotation
-keepattributes *Annotation*

# Gson specific classes
-keep class sun.misc.Unsafe { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }

For more details, check this example of Proguard file, provided in GSON repository.

How do you stop Proguard from removing type parameters?

According to the ProGuard Typical Library usage guide:

The "Signature" attribute is required to be able to access generic types when compiling in JDK 5.0 and higher.

Adding the following line fixed my issues with missing type parameters:

-keepattributes Signature

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