Android

RecyclerView makes it easy to efficiently display large sets of data. You supply the data and define how each item looks, and the RecyclerView library dynamically creates the elements when they're needed. As the name implies, RecyclerView recycles those individual elements. When an item scrolls off the screen, RecyclerView doesn't destroy its view. Instead, RecyclerView reuses the view for new items that have scrolled onscreen. This reuse vastly improves performance, improving your app's responsiveness and reducing power consumption. Now RecyclerView is part of Android Jetpack Example: MainActivity.java import android.support.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import androidx.fragment.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android

Consider using simple NavigationView instead of this old Navigation drawer , which based on Material design and much simpler and very flexible than this Navigation drawer. This NavigationDrawer example is developed by using appcompat library project in eclipse kepler. Code: MainActivity.java import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.FragmentManager; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.support.v4.widget.DrawerLayout; public class MainActivity extends ActionBarActivity implements NavigationDrawerFragment.NavigationDrawerCallbacks { /** * Fragment managing the behaviors, interactions and presentation of the * navigation drawer. */ private NavigationDrawerFragment mNavigationDrawerFragment; /** * Used to store the last screen title. For use in * {@link #restoreActionBar()}. */ private CharSequence mTitle; @Override protected

Using ConnectivityManager class we can detect Internet connection availability in Android. Code: ConnectionDetector.java import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; public class ConnectionDetector { private Context _context; public ConnectionDetector(Context context){ this._context = context; } /** * Checking for all possible internet providers * **/ public boolean isConnectingToInternet(){ ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivity != null) { NetworkInfo[] info = connectivity.getAllNetworkInfo(); if (info != null) for (int i = 0; i < info.length; i++) if (info[i].getState() == NetworkInfo.State.CONNECTED) { return true; }