feat: Implement LoaderCallbacks and display the data

app/src/main/java/divyanshu/networking/EarthquakeLoader.java

@@ -20,4 +20,10 @@ public List<Earthquake> loadInBackground() {
         String requestURL = "https://earthquake.usgs.gov/fdsnws/event/1/query?format=geojson&starttime=2016-01-01&endtime=2016-05-02&minfelt=50&minmagnitude=5";
         return NetworkHelper.fetchEarthquakeData(requestURL);
     }
+
+    @Override
+    protected void onStartLoading() {
+        forceLoad();
+    }
+
 }

app/src/main/java/divyanshu/networking/MainActivity.java

@@ -1,15 +1,55 @@
 package divyanshu.networking;
 
+import android.support.v4.app.LoaderManager;
+import android.support.v4.content.Loader;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.widget.TextView;
 
+import java.util.List;
 
-public class MainActivity extends AppCompatActivity {
+
+public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<List<Earthquake>>{
+
+    TextView tv_display_data;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
+        tv_display_data = (TextView) findViewById(R.id.tv_display_data);
+
+        getSupportLoaderManager().initLoader(0, null, this);
+    }
+
+
+    private void displayData(List<Earthquake> data) {
+        tv_display_data.setText("");
+
+        for (int i = 0; i < data.size(); ++i){
+            Earthquake earthquake = data.get(i);
+            tv_display_data.append(
+                    earthquake.getMagnitude() + " - "
+                    + earthquake.getLocation() + " - "
+                    + earthquake.getTimeInMillis()
+                    + "\n"
+                    );
+        }
+    }
+
+    @Override
+    public Loader<List<Earthquake>> onCreateLoader(int id, Bundle args) {
+        return new EarthquakeLoader(this);
+    }
+
+    @Override
+    public void onLoadFinished(Loader<List<Earthquake>> loader, List<Earthquake> data) {
+        displayData(data);
+    }
+
+
+    @Override
+    public void onLoaderReset(Loader<List<Earthquake>> loader) {
     }
 }

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

@@ -7,9 +7,10 @@
     tools:context="divyanshu.networking.MainActivity">
 
     <TextView
+        android:id="@+id/tv_display_data"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text="Display Data"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"