magdamiu

def room_version = "2.2.6"

implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"

magdamiu

import android.content.Context;
import android.content.SharedPreferences;

public class ApplicationData {
    private static final String APP_KEY = "android_course_key";

    // save a String value by key
    public static void setStringValueInSharedPreferences(Context context, String key, String value) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(ApplicationData.APP_KEY,
                Context.MODE_PRIVATE);

magdamiu

// manifest add => <uses-permission android:name="android.permission.CAMERA" />

import static android.Manifest.permission.CAMERA;

private static final int REQUEST_CODE_CAMERA = 23;


if (ContextCompat.checkSelfPermission(StylesActivity.this, CAMERA) != PackageManager.PERMISSION_GRANTED) {
    // unhappy path
    ActivityCompat.requestPermissions(StylesActivity.this, new String[]{CAMERA}, REQUEST_CODE_CAMERA);

magdamiu

private void setupSwipeToRefresh() {
    swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            // Make sure you call swipeRefreshLayout.setRefreshing(false)
            // once the network request has completed successfully.
            inbox();
        }
    });
    // Configure the refreshing colors

magdamiu

// Clean all elements of the recycler
public void clear() {
    emails.clear();
    notifyDataSetChanged();
}

// Add a list of items
public void addAll(List<Email> list) {
    emails.addAll(list);
    notifyDataSetChanged();

magdamiu

<?xml version="1.0" encoding="utf-8"?>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swipeContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerViewEmails"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

magdamiu

implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'

magdamiu

private void setItemDecorator() {
    RecyclerView.ItemDecoration itemDecoration = new
            DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
    recyclerViewEmails.addItemDecoration(itemDecoration);
}

magdamiu

public class EmailDiffCallback extends DiffUtil.Callback {

    private List<Email> oldList;
    private List<Email> newList;

    public EmailDiffCallback(List<Email> oldList, List<Email> newList) {
        this.oldList = oldList;
        this.newList = newList;
    }

magdamiu

// NOT OK
void onNewEmailsArrivedNotRecommended(List<Email> newEmails) {
    emailAdapter.setEmails(newEmails);
    emailAdapter.notifyDataSetChanged();
}

// OK
void onNewDataArrivedFastRendering(List<Email> newEmails) {
    List<Email> oldEmails = emailAdapter.getEmails();
    DiffUtil.DiffResult result = DiffUtil.calculateDiff(new EmailDiffCallback(oldEmails, newEmails));