+ Listview Adapter class

+ iTunes API response parser
+ Artists listview loader
+ Search functionality
+ Search timer logic

app/src/main/java/com/hakodev/androiditunesapi/activities/ArtistListActivity.java

@@ -3,20 +3,31 @@ package com.hakodev.androiditunesapi.activities;
 import android.Manifest;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
 import android.support.constraint.ConstraintLayout;
 import android.support.design.widget.Snackbar;
 import android.support.v7.app.AppCompatActivity;
+import android.text.Editable;
+import android.text.TextWatcher;
 import android.util.Log;
+import android.widget.EditText;
+import android.widget.ListView;
 import android.widget.Toast;
 
 import com.anthonycr.grant.PermissionsManager;
 import com.anthonycr.grant.PermissionsResultAction;
+import com.google.gson.Gson;
 import com.hakodev.androiditunesapi.AndroidItunesAPI;
 import com.hakodev.androiditunesapi.R;
+import com.hakodev.androiditunesapi.adapters.ArtistsListAdapter;
+import com.hakodev.androiditunesapi.models.ItunesResponse;
+import com.hakodev.androiditunesapi.models.Result;
 import com.hakodev.androiditunesapi.util.Utils;
 
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Random;
+import java.util.Timer;
+import java.util.TimerTask;
 
 import okhttp3.Call;
 import okhttp3.Callback;
@@ -28,9 +39,17 @@ public class ArtistListActivity extends AppCompatActivity {
 
     private final static String TAG = "ArtistListActivity";
     private final static String SEARCH_URL = "https://itunes.apple.com/search?term=%1$s&country=US&entity=musicArtist&limit=10";
+    private final static String[] DEMO_ARTISTS = {"Valentine", "Children", "Red"};
 
     private OkHttpClient networkClient;
+    private ArtistsListAdapter artistsListAdapter;
+    private ArrayList<String> artistsList = new ArrayList<>();
+
     private ConstraintLayout lytBase;
+    private ListView listArtists;
+    private EditText txtArtistSearch;
+
+    private Timer keypressTimer = new Timer();
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -40,6 +59,9 @@ public class ArtistListActivity extends AppCompatActivity {
         setupViews();
         init();
         askForPermissions();
+
+        int randomArtistIndex = new Random().nextInt(DEMO_ARTISTS.length);
+        requestArtist(DEMO_ARTISTS[randomArtistIndex]);
     }
 
     @Override
@@ -53,10 +75,40 @@ public class ArtistListActivity extends AppCompatActivity {
 
     private void setupViews() {
         lytBase = findViewById(R.id.lytBase);
+        listArtists = findViewById(R.id.listArtists);
+        txtArtistSearch = findViewById(R.id.txtArtistSearch);
+        txtArtistSearch.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+
+            }
+
+            @Override
+            public void afterTextChanged(Editable txt) {
+                keypressTimer.cancel();
+                keypressTimer = new Timer();
+                keypressTimer.schedule(
+                        new TimerTask() {
+                            @Override
+                            public void run() {
+                                if (txt.toString().length() > 3){
+                                    requestArtist(txt.toString());
+                                }
+                            }
+                        }, 200);
+            }
+        });
     }
 
     private void init() {
         networkClient = AndroidItunesAPI.getInstance().getNetworkClient();
+        artistsListAdapter = new ArtistsListAdapter(this, artistsList);
+        listArtists.setAdapter(artistsListAdapter);
     }
 
     private void askForPermissions() {
@@ -90,10 +142,26 @@ public class ArtistListActivity extends AppCompatActivity {
 
                         @Override
                         public void onResponse(@NonNull Call call, @NonNull final Response response) throws IOException {
-                            String res = response.body().string();
+                            String body = response.body().string();
-                            Log.w(TAG, res);
+                            Log.w(TAG, body);
+                            buildArtistsList(parseArtistsResponse(body));
                         }
                     });
         }).start();
     }
+
+    private ArrayList<String> parseArtistsResponse(String body) {
+        ItunesResponse itunesResponse = new Gson().fromJson(body, ItunesResponse.class);
+        ArrayList<String> artistsNames = new ArrayList<>();
+        for (Result artist : itunesResponse.getResults()) {
+            artistsNames.add(artist.getArtistName());
+        }
+        return artistsNames;
+    }
+
+    private void buildArtistsList(ArrayList<String> artists) {
+        artistsList.clear();
+        artistsList.addAll(artists);
+        runOnUiThread(() -> artistsListAdapter.notifyDataSetChanged());
+    }
 }

app/src/main/java/com/hakodev/androiditunesapi/adapters/ArtistsListAdapter.java

@@ -0,0 +1,41 @@
+package com.hakodev.androiditunesapi.adapters;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.hakodev.androiditunesapi.R;
+
+import java.util.ArrayList;
+
+public class ArtistsListAdapter extends ArrayAdapter<String> {
+    private final Context context;
+    private final ArrayList<String> values;
+
+    public ArtistsListAdapter(Context context, ArrayList<String> values) {
+        super(context, R.layout.artists_list_adapter, values);
+        this.context = context;
+        this.values = values;
+    }
+
+    @NonNull
+    @Override
+    public View getView(int position, View convertView, @NonNull ViewGroup parent) {
+        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+        if (convertView == null) {
+            if (inflater != null) {
+                convertView = inflater.inflate(R.layout.artists_list_adapter, parent, false);
+            }
+        }
+        TextView textView = convertView.findViewById(R.id.lblArtistName);
+        ImageView imageView = convertView.findViewById(R.id.imgArtist);
+        textView.setText(values.get(position));
+        imageView.setImageResource(R.drawable.default_artist);
+        return convertView;
+    }
+}

app/src/main/java/com/hakodev/androiditunesapi/models/ItunesResponse.java

@@ -5,20 +5,20 @@ import com.google.gson.annotations.SerializedName;
 
 import java.util.List;
 
-public class Response {
+public class ItunesResponse {
 
     @SerializedName("resultCount")
     @Expose
-    private Long resultCount;
+    private int resultCount;
     @SerializedName("results")
     @Expose
     private List<Result> results = null;
 
-    public Long getResultCount() {
+    public int getResultCount() {
         return resultCount;
     }
 
-    public void setResultCount(Long resultCount) {
+    public void setResultCount(int resultCount) {
         this.resultCount = resultCount;
     }
 

app/src/main/res/layout/activity_artists_list.xml

@@ -5,7 +5,9 @@
     android:id="@+id/lytBase"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="com.hakodev.androiditunesapi.activities.ArtistListActivity">
+    tools:context="com.hakodev.androiditunesapi.activities.ArtistListActivity"
+    android:focusable="true"
+    android:focusableInTouchMode="true">
 
     <EditText
         android:id="@+id/txtArtistSearch"
@@ -24,13 +26,11 @@
         app:layout_constraintTop_toTopOf="parent" />
 
     <ListView
-        android:id="@+id/listView"
+        android:id="@+id/listArtists"
         android:layout_width="0dp"
         android:layout_height="0dp"
-        android:layout_marginBottom="8dp"
+        android:layout_margin="16dp"
-        android:layout_marginEnd="8dp"
+        android:background="@color/colorAccent"
-        android:layout_marginStart="8dp"
-        android:layout_marginTop="8dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"

app/src/main/res/layout/artists_list_adapter.xml

@@ -2,17 +2,14 @@
 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="48dp"
+    android:layout_height="58dp"
     android:layout_gravity="center_vertical">
 
     <ImageView
         android:id="@+id/imgArtist"
         android:layout_width="36dp"
         android:layout_height="36dp"
-        android:layout_marginBottom="8dp"
+        android:layout_margin="16dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginTop="8dp"
-        android:layout_marginLeft="8dp"
         android:contentDescription="@string/description_artists_image"
         android:src="@drawable/default_artist"
         app:layout_constraintBottom_toBottomOf="parent"
@@ -21,14 +18,12 @@
 
     <TextView
         android:id="@+id/lblArtistName"
-        android:layout_width="wrap_content"
+        android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:layout_marginBottom="8dp"
+        android:layout_margin="16dp"
-        android:layout_marginEnd="8dp"
+        android:textSize="18sp"
-        android:layout_marginStart="8dp"
-        android:layout_marginTop="8dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/imgArtist"
         app:layout_constraintTop_toTopOf="parent" />
 </android.support.constraint.ConstraintLayout>

app/src/main/res/values/styles.xml

@@ -10,6 +10,9 @@
         <item name="android:textColor">@color/colorText</item>
         <item name="android:textColorSecondary">@color/colorTextSecondary</item>
         <item name="android:textColorHint">@color/colorHintText</item>
+
+        <item name="colorControlNormal">@color/colorPrimary</item>
+        <item name="android:editTextColor">@color/colorText</item>
     </style>
 
     <style name="AppTheme.NoActionBar">