When I enabled the Minify, the data is coming from the API but the recyclerview is not showing, And I have never used Proguard, that's why I have no idea, And there is no error in logcat.

ProGuard-rules.pro

# Add project specific ProGuard rules here.
# You can control the set of applied configuration files using the
# proguardFiles setting in build.gradle.
#
# For more details, see
#   http://developer.android.com/guide/developing/tools/proguard.html

# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
#   public *;
#}

# Uncomment this to preserve the line number information for
# debugging stack traces.
#-keepattributes SourceFile,LineNumberTable

#-keepattributes *Annotation*

-keep class com.example.mvilaa.ends**{*; }

    # Retrofit2
-keepclasseswithmembers class * {
    @retrofit2.http.* <methods>;
}
-keepclassmembernames interface * {
    @retrofit2.http.* <methods>;
}

# GSON Annotations
-keepclassmembers,allowobfuscation class * {
  @com.google.gson.annotations.SerializedName <fields>;
}

Retro Module

@Module
@InstallIn(SingletonComponent::class)
object AppModule {

    @Provides
    @Singleton
    fun provideGsonBuilder(): Gson = GsonBuilder()
        .excludeFieldsWithoutExposeAnnotation()
        .create()

    @Singleton
    @Provides
    fun provideOkHttpClient() = if (BuildConfig.DEBUG) {
        val loggingInterceptor = HttpLoggingInterceptor()
        val interceptor = OAuthInterceptor(
            "Bearer", AK.apiKey
        )
        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY)
        OkHttpClient.Builder()
            .connectTimeout(60, TimeUnit.SECONDS)
            .readTimeout(60, TimeUnit.SECONDS)
            .addInterceptor(interceptor)
            .addInterceptor(loggingInterceptor)
            .build()
    } else {
        OkHttpClient
            .Builder()
            .build()
    }

    @Provides
    @Singleton
    fun provideRetrofit(okHttpClient: OkHttpClient, gson: Gson): Retrofit = Retrofit.Builder()
        .baseUrl(AK.baseUrl)
        .client(okHttpClient)
        .addConverterFactory(GsonConverterFactory.create(gson))
        .build()

    @Provides
    @Singleton
    fun provideNetworkService(retrofit: Retrofit): Ends = retrofit.create(Ends::class.java)

}

Ends

interface Ends {

     @GET("test/feature_slider")
    suspend fun getHFS(
        @Query("page") page: Int = 1
    ): Response<EndsResponse>

    @GET("test/latest")
    suspend fun getRec(
        @Query("page") page: Int = 1
    ): Response<EndsResponse>
}

EndsMeta

@Parcelize
@Keep data class Movie(
    val id: Int?,
    val title: String?,
    val s: String?,
    val language: String?,
    val tr: String?,
    val test: Double?,
    val link: List<Links>? = null
) : Parcelable

EndsResponse

@Keep
data class EndsResponse(
//    @Expose val page: Int,
     val data: List<Movie>
)

handleCommonResponse

fun handleCommonResponse(response: Response<EndsResponse>): NR<EndsResponse> {
    when {
        response.message().toString().contains("timeout") -> {
            return NR.Error(message = "Timeout!!!")
        }
        response.code() == 402 -> {
            return NR.Error(message = "Quota Exceeded!!")
        }
        response.body()!!.data.isNullOrEmpty() -> {
            return NR.Error(message = "Test not found.")
        }
        response.isSuccessful -> {
            val test = response.body()
            return NR.Success(test!!)
        }
        else -> {
            return NR.Error(message = response.message())
        }
    }
}

Resource

sealed class NR<T>(
    val data: T? = null,
    val message: String? = null
) {

    class Success<T>(data: T) : NR<T>(data)
    class Error<T>(data: T? = null, message: String?) : NR<T>(data, message)
    class Loading<T> : NR<T>()

Rds

class Rds @Inject constructor(
    private val ends: Ends
) {

    suspend fun getHFS(): Response<EndsResponse> {
        return ends.getHFS()

    }
}

ViewModel

@HiltViewModel
class HmViewModel @Inject constructor(
    private val remote: Rds
) : ViewModel() {

    var hfsRes: MutableLiveData<NR<EndsResponse>> =
        MutableLiveData()

    fun hfs() = viewModelScope.launch {
        getHfsSafeCall()
    }

    private suspend fun getHfsSafeCall() {
        hfsRes.value = NR.Loading()
        try {
            val response = remote.getHFS()
            hfsRes.value = handleCommonResponse(response)
        } catch (e: Exception) {
            hfsRes.value = NR.Error(message = "Test Not Found!!")
        }
    }

Adapter

class HMAdapter : RecyclerView.Adapter<HMAdapter.MovieViewHolder>() {

    private var testList = emptyList<Movie>()

    class MovieViewHolder(val binding: ItemMvBinding) :
        RecyclerView.ViewHolder(binding.root) {
        fun bindData(movie: Movie) {

            binding.apply {

                Glide.with(itemView)
                    .asBitmap()
                    .load(test.poster)
                    .centerCrop()
                    .into(ps)

            }
        }

        companion object {
            fun from(parent: ViewGroup): MovieViewHolder {
                val layoutInflater = LayoutInflater.from(parent.context)
                val binding = ItemMvBinding.inflate(layoutInflater, parent, false)
                return MovieViewHolder(binding)
            }
        }
    }

    override fun onCreateViewHolder(
        parent: ViewGroup,
        viewType: Int
    ): MovieViewHolder {
        return MovieViewHolder.from(parent)
    }

    override fun onBindViewHolder(holder: MovieViewHolder, position: Int) {
        val currentMovie = testList[position]
        holder.bindData(currentMovie)
       
        holder.itemView.setOnClickListener { mView ->
            val direction = LndFragmentDirections.actionLndFragmentToMvDetailFragment(currentMovie)
            mView.findNavController().safeNavigate(direction)
        }
    }

    override fun getItemCount(): Int {
        return testList.size
    }

    fun setCommonData(newData: EndsResponse) {
        val movieDiffUtil = LndDiffUtil(testList, newData.data)
        val diffUtilResult = DiffUtil.calculateDiff(movieDiffUtil)
        testList = newData.data
        diffUtilResult.dispatchUpdatesTo(this)
    }

    fun clearList() {
        testList = emptyList()
    }
}

Fragment

@AndroidEntryPoint
class HmFragment : Fragment(R.layout.hm_fragment), View.OnClickListener {

    private var _binding: HmFragmentBinding? = null
    private val binding get() = _binding!!

    private val hfsAdapter by lazy { HFSAdapter() }
    private val recAdapter by lazy { HMAdapter() }

    private val viewModel: HmViewModel by viewModels()

 override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        _binding = HmFragmentBinding.bind(view)

        initFetch()
        initAdapters()
    }

 private fun initAdapters() {

        binding.apply {

            recyclerViewSlider.apply {
                adapter = hfsAdapter
                isNestedScrollingEnabled = false
                ViewCompat.setNestedScrollingEnabled(recyclerViewSlider, false)
                PagerSnapHelper().attachToRecyclerView(this)
            }
            recyclerRec.apply {
                adapter = recdAdapter
                isNestedScrollingEnabled = false
                ViewCompat.setNestedScrollingEnabled(recyclerViewRec, false)
            }
           
        }
    }

    private fun initFetch() {

        viewModel.hfs()
        viewModel.hfsRes.observe(viewLifecycleOwner, { response ->
            when (response) {
                is NR.Success -> {
                    response.data?.let {
                        hfsAdapter.setCommonData(it)
                    }
                    Toast.makeText(activity, "${response.data}", Toast.LENGTH_SHORT).show()
                }
                is NR.Error -> {
                    Toast.makeText(
                        activity,
                        "in hfs error"   response.message.toString(),
                        Toast.LENGTH_SHORT
                    ).show()
                }
                is NR.Loading -> {
                }
            }
        })
}

This is my code, you just tell me that my mistake is happening, because data was fetched from rest api, but viewmodel [ test not found!! ] Error is being thrown.

CodePudding user response：

When we use minify = true then progaurd change your model name & variable in random name like(a.b.d.c.k).

So after getting response our model not recognise which key get value. So we get all time null/empty in our Livedata on ViewModel.

You can write keep class progaurd rules in your progaurd-rules.pro Like this.

-keep class com.example.data.model**{*; }  //data class package

if not work then also put this lines.

    # Retrofit2
-keepclasseswithmembers class * {
    @retrofit2.http.* <methods>;
}
-keepclassmembernames interface * {
    @retrofit2.http.* <methods>;
}

# GSON Annotations
-keepclassmembers,allowobfuscation class * {
  @com.google.gson.annotations.SerializedName <fields>;
}

Note : Put your all data class (Pojo class) in one package.

If you have any issue Let me Know.

CodePudding user response：

Since you have not posted any logs its tough to comment what went wrong.

Try to include log statement from data to presentation layer to see what's happening.

I would strongly recommend to check below proguard rules for retrofit as well. https://github.com/square/retrofit/blob/master/retrofit/src/main/resources/META-INF/proguard/retrofit2.pro