#1 — Job Finder App (https://youtu.be/YlB0Oulip4o)

ActivityBuilder.java

import dagger.Module;
import dagger.android.ContributesAndroidInjector;
import id.haerulmuttaqin.jobfinder.ui.MainActivity;

@Module
public abstract class ActivityBuilder {
    
    @ContributesAndroidInjector
    abstract MainActivity mainActivity();
}

ApiInterface.java

import java.util.List;

import id.haerulmuttaqin.jobfinder.data.entity.GithubJob;
import retrofit2.Call;
import retrofit2.http.GET;

public interface ApiInterface {
    
    @GET("positions.json")
    Call<List<GithubJob>> getJobList();

}

ConnectionServer.java

import java.util.List;

import javax.inject.Inject;

import id.haerulmuttaqin.jobfinder.data.entity.GithubJob;
import retrofit2.Call;

public class ConnectionServer {

    @Inject
    ApiInterface apiInterface;
    
    public ConnectionServer(ApiInterface apiInterface) {
        this.apiInterface = apiInterface;
    }
    
    public Call<List<GithubJob>> getJobList() {
        return apiInterface.getJobList();
    };
}

GithubJob.java

public class GithubJob {
    @SerializedName("id")
    @Expose
    public String id;
    @SerializedName("type")
    @Expose
    public String type;
    @SerializedName("url")
    @Expose
    public String url;
    @SerializedName("created_at")
    @Expose
    public String createdAt;
    @SerializedName("company")
    @Expose
    public String company;
    @SerializedName("company_url")
    @Expose
    public String companyUrl;
    @SerializedName("location")
    @Expose
    public String location;
    @SerializedName("title")
    @Expose
    public String title;
    @SerializedName("description")
    @Expose
    public String description;
    @SerializedName("how_to_apply")
    @Expose
    public String howToApply;
    @SerializedName("company_logo")
    @Expose
    public String companyLogo;
}

item_job.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <data>
        <import type="android.view.View" />
        <variable
            name="item"
            type="id.haerulmuttaqin.jobfinder.data.entity.GithubJob" />
    </data>

    <com.google.android.material.card.MaterialCardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="10dp"
        android:layout_marginEnd="10dp"
        android:layout_marginTop="8dp"
        app:cardCornerRadius="10dp"
        app:cardElevation="0dp"
        app:strokeColor="#f1f1f1"
        app:strokeWidth="1dp">

        <LinearLayout
            android:orientation="vertical"
            android:clickable="true"
            android:focusable="true"
            android:background="?attr/selectableItemBackground"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="6dp"
                android:layout_marginBottom="9dp"
                android:padding="4dp" >
                <com.google.android.material.card.MaterialCardView
                    android:id="@+id/photoPreviewLayout"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:layout_marginStart="6dp"
                    android:src="@drawable/ic_photo"
                    app:strokeWidth="0.5dp"
                    app:strokeColor="#f1f1f1"
                    app:cardElevation="0dp"
                    app:cardCornerRadius="8dp">
                    <ImageView
                        android:id="@+id/photoPreview"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:scaleType="centerInside"
                        android:layout_margin="5dp"
                        tools:ignore="UnusedAttribute" />
                    <com.facebook.shimmer.ShimmerFrameLayout
                        android:id="@+id/progress"
                        android:layout_width="60dp"
                        android:layout_height="60dp"
                        android:orientation="vertical"
                        app:shimmer_auto_start="true"
                        app:shimmer_duration="800">
                        <View
                            android:layout_width="60dp"
                            android:layout_height="60dp"
                            android:gravity="center"
                            android:layout_gravity="center"
                            android:background="@color/gray_100" />
                    </com.facebook.shimmer.ShimmerFrameLayout>

                </com.google.android.material.card.MaterialCardView>

                <LinearLayout
                    android:layout_toEndOf="@id/photoPreviewLayout"
                    android:orientation="vertical"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <TextView
                        android:id="@+id/title"
                        android:ellipsize="end"
                        android:maxLines="2"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="16dp"
                        android:text="@{item.title}"
                        android:textColor="@color/gray_500"
                        android:textSize="18sp"
                        android:layout_marginBottom="3dp"
                        android:fontFamily="@font/bold"/>
                    <RelativeLayout
                        android:layout_marginStart="14dp"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">
                        <ImageView
                            android:id="@+id/lampIcon"
                            android:src="@drawable/ic_round_business_24"
                            app:tint="@color/gray_300"
                            android:layout_marginEnd="5dp"
                            android:layout_width="15dp"
                            android:layout_height="16sp"/>
                        <TextView
                            android:layout_toEndOf="@id/lampIcon"
                            android:id="@+id/lamp"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:textColor="@color/gray_400"
                            android:text="@{item.company}"
                            android:textSize="12sp"
                            android:singleLine="true"
                            android:ellipsize="end"
                            android:fontFamily="@font/book"/>
                    </RelativeLayout>
                    <RelativeLayout
                        android:layout_marginStart="14dp"
                        android:layout_marginTop="3dp"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">
                        <ImageView
                            android:id="@+id/locIcon"
                            android:src="@drawable/ic_outline_location_on_24"
                            app:tint="@color/gray_300"
                            android:layout_marginEnd="5dp"
                            android:layout_width="15dp"
                            android:layout_height="16sp"/>
                        <TextView
                            android:layout_toEndOf="@id/locIcon"
                            android:id="@+id/address"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:textColor="@color/gray_400"
                            android:text="@{item.location}"
                            android:textSize="12sp"
                            android:singleLine="true"
                            android:ellipsize="end"
                            android:fontFamily="@font/book"/>
                    </RelativeLayout>
                    <RelativeLayout
                        android:layout_marginStart="14dp"
                        android:layout_marginTop="3dp"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">
                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginTop="6dp"
                            android:paddingStart="6dp"
                            android:paddingEnd="6dp"
                            android:paddingTop="2dp"
                            android:paddingBottom="2dp"
                            android:background="@drawable/bg_job_type"
                            android:textColor="@color/blue_500"
                            android:text="@{item.type}"
                            android:textSize="10sp"
                            android:fontFamily="@font/book"/>
                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginStart="16dp"
                            android:layout_marginTop="6dp"
                            android:paddingStart="6dp"
                            android:paddingEnd="6dp"
                            android:paddingTop="2dp"
                            android:paddingBottom="2dp"
                            android:layout_alignParentEnd="true"
                            android:textColor="@color/gray_300"
                            android:text="@{item.createdAt}"
                            android:textSize="11sp"
                            android:fontFamily="@font/book"/>
                    </RelativeLayout>
                </LinearLayout>
            </RelativeLayout>
        </LinearLayout>

    </com.google.android.material.card.MaterialCardView>
</layout>

MainActivity.java

import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.lifecycle.ViewModelProvider;

import javax.inject.Inject;

import id.haerulmuttaqin.jobfinder.R;
import id.haerulmuttaqin.jobfinder.base.BaseActivity;
import id.haerulmuttaqin.jobfinder.data.api.ConnectionServer;
import id.haerulmuttaqin.jobfinder.databinding.ActivityMainBinding;

public class MainActivity extends BaseActivity<ActivityMainBinding, MainViewModel> implements  MainViewModel.Navigator {
    
    @Inject ConnectionServer server;
    private ActivityMainBinding binding;
    private MainViewModel viewModel;
    
    @Override
    public int getBindingVariable() {
        return 0;
    }
    
    @Override
    public int getLayoutId() {
        return R.layout.activity_main;
    }
    
    @Override
    public MainViewModel getViewModel() {
        return viewModel;
    }
    
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); 
        binding = getViewDataBinding();
        viewModel = new ViewModelProvider(this, new MainViewModel.ModelFactory(this, server)).get(MainViewModel.class);
        viewModel.setNavigator(this);
        viewModel.getJobFromServer();
        viewModel.jobList.observe(this, githubJobs -> {
            binding.recyclerView.setAdapter(new MainAdapter(githubJobs));
        });
    }
}

MainAdapter.java

import android.annotation.SuppressLint;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.databinding.DataBindingUtil;
import androidx.recyclerview.widget.RecyclerView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.DataSource;
import com.bumptech.glide.load.engine.GlideException;
import com.bumptech.glide.load.resource.drawable.DrawableTransitionOptions;
import com.bumptech.glide.request.RequestListener;
import com.bumptech.glide.request.target.Target;

import java.util.List;

import id.haerulmuttaqin.jobfinder.R;
import id.haerulmuttaqin.jobfinder.data.entity.GithubJob;
import id.haerulmuttaqin.jobfinder.databinding.ItemJobBinding;

public class MainAdapter extends RecyclerView.Adapter<MainAdapter.RecyclerViewAdapter> {

    private List<GithubJob> data;

    protected MainAdapter(List<GithubJob> data) {
        this.data = data;
    }

    @NonNull
    @Override
    public RecyclerViewAdapter onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        ItemJobBinding binding = DataBindingUtil.inflate(inflater, R.layout.item_job, parent, false);
        return new RecyclerViewAdapter(binding);
    }

    public void clear() {
        int size = data.size();
        data.clear();
        notifyItemRangeRemoved(0, size);
        notifyDataSetChanged();
    }
    

    @Override
    public void onBindViewHolder(RecyclerViewAdapter holder, int position) {
        GithubJob items = data.get(position);
        if(items != null) {
            holder.bind(items);
        }
    }

    @Override
    public int getItemCount() {
        return  data == null ? 0 : data.size();
    }

    public static class RecyclerViewAdapter extends RecyclerView.ViewHolder {
        ItemJobBinding binding;
        public RecyclerViewAdapter(ItemJobBinding binding) {
            super(binding.getRoot());
            this.binding = binding;
        }
        @SuppressLint("UseCompatLoadingForDrawables")
        void bind(@NonNull GithubJob data) {
            Glide.with(binding.photoPreview.getContext())
                    .load(data.companyLogo)
                    .error(binding.photoPreview.getContext().getDrawable(R.drawable.ic_round_business_center_24))
                    .transition(DrawableTransitionOptions.withCrossFade())
                    .listener(new RequestListener<Drawable>() {
                        @Override
                        public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Drawable> target, boolean isFirstResource) {
                            binding.progress.stopShimmer();
                            binding.progress.setVisibility(View.GONE);
                            return false;
                        }

                        @Override
                        public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target, DataSource dataSource, boolean isFirstResource) {
                            binding.progress.stopShimmer();
                            binding.progress.setVisibility(View.GONE);
                            return false;
                        }
                    })
                    .into(binding.photoPreview);
            
            binding.setItem(data);
            binding.executePendingBindings();
        }
    }
}

MainViewModel.java

import android.content.Context;

import androidx.annotation.NonNull;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
import androidx.lifecycle.ViewModelProvider;

import java.util.List;

import id.haerulmuttaqin.jobfinder.base.BaseViewModel;
import id.haerulmuttaqin.jobfinder.data.api.ConnectionServer;
import id.haerulmuttaqin.jobfinder.data.entity.GithubJob;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class MainViewModel extends BaseViewModel<MainViewModel.Navigator> {
    
    MutableLiveData<List<GithubJob>> jobList = new MutableLiveData<>();
    
    public MainViewModel(Context context, ConnectionServer connectionServer) {
        super(context, connectionServer);
    }
    
    public void getJobFromServer() {
        getNavigator().showProgress();
        getConnectionServer().getJobList().enqueue(new Callback<List<GithubJob>>() {
            @Override
            public void onResponse(Call<List<GithubJob>> call, Response<List<GithubJob>> response) {
                if (response.isSuccessful() && response.body().size() > 0) {
                    jobList.postValue(response.body());
                }
                getNavigator().hideProgress();
            }

            @Override
            public void onFailure(Call<List<GithubJob>> call, Throwable t) {
                t.getLocalizedMessage();
                getNavigator().hideProgress();
            }
        });
    }

    public static class ModelFactory implements ViewModelProvider.Factory {
        private Context context;
        private ConnectionServer server;
        public ModelFactory(Context context, ConnectionServer server) {
            this.context = context;
            this.server = server;
        }
        @NonNull
        @Override
        public <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
            return (T) new MainViewModel(context, server);
        }
    }
    
    interface Navigator {
        void showProgress();
        void hideProgress();
    }
}