title: Sliding images doesn't work
body: <p>I have two Java Classes. The first activity is the <code>MainActivity</code> which is the NavigationView Activity named HomeScreen. In the content_layout I added <code>Sliding Images Layout</code> logic of which is implemented in a new class named <code>Slider</code>.</p>
  
  <p>When I run the app, the layout for the sliding images is empty. I think I have to "combine" these two activities so when I run the app, <code>Slider</code> will also work to make the sliding images appeared and working.</p>
  
  <p>Here is my code logic -</p>
  
  <p><strong>HomeScreen Activity</strong></p>
  
  <pre><code>import android.content.Context;
  import android.content.DialogInterface;
  import android.content.Intent;
  import android.content.SharedPreferences;
  import android.os.Bundle;
  import android.support.annotation.NonNull;
  import android.support.design.widget.NavigationView;
  import android.support.v4.view.GravityCompat;
  import android.support.v4.widget.DrawerLayout;
  import android.support.v7.app.ActionBarDrawerToggle;
  import android.support.v7.app.AlertDialog;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  import android.view.MenuItem;
  
  import com.daimajia.slider.library.SliderLayout;
  
  import static com.pertanian.puslitbangbun.fixyou.Login.my_shared_preferences;
  import static com.pertanian.puslitbangbun.fixyou.Login.session_status;
  
  public class HomeScreen extends AppCompatActivity
          implements NavigationView.OnNavigationItemSelectedListener {
  
      SharedPreferences sharedpreferences;
      Boolean session = false;
      Slider slider;
  
      public static final String TAG_ID = "id";
      public static final String TAG_USERNAME = "username";
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_home_screen);
          Toolbar toolbar = findViewById(R.id.toolbar);
          setSupportActionBar(toolbar);
  
          DrawerLayout drawer = findViewById(R.id.drawer_layout);
          ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                  this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
          drawer.addDrawerListener(toggle);
          toggle.syncState();
  
          NavigationView navigationView = findViewById(R.id.nav_view);
          navigationView.setNavigationItemSelectedListener(this);
          sharedpreferences = getSharedPreferences(my_shared_preferences, Context.MODE_PRIVATE);
          session = sharedpreferences.getBoolean(session_status, false);
          if (session) {
              navigationView.getMenu().findItem(R.id.admin).setVisible(false);
          }
          else {
              navigationView.getMenu().findItem(R.id.logout).setVisible(false);
          }
      }
  
      @Override
      public void onBackPressed() {
          DrawerLayout drawer = findViewById(R.id.drawer_layout);
          if (drawer.isDrawerOpen(GravityCompat.START)) {
              drawer.closeDrawer(GravityCompat.START);
          } else {
              AlertDialog.Builder builder = new AlertDialog.Builder(this);
              builder.setCancelable(true);
              builder.setMessage("Anda yakin ingin keluar?");
              builder.setPositiveButton("Ya", new DialogInterface.OnClickListener() {
                  @Override
                  public void onClick(DialogInterface dialog, int which) {
                      //if user pressed "yes", then he is allowed to exit from application
                      moveTaskToBack(true);
                      finish();
                  }
              });
              builder.setNegativeButton("Tidak", new DialogInterface.OnClickListener() {
                  @Override
                  public void onClick(DialogInterface dialog, int which) {
                      //if user select "No", just cancel this dialog and continue with app
                      dialog.cancel();
                  }
              });
              AlertDialog alert = builder.create();
              alert.show();
          }
  
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          item.getItemId();
  
          return super.onOptionsItemSelected(item);
      }
  
      @SuppressWarnings("StatementWithEmptyBody")
      @Override
      public boolean onNavigationItemSelected(@NonNull MenuItem item) {
          // Handle navigation view item clicks here.
          int id = item.getItemId();
  
          if (id == R.id.artikel) {
              Intent i = new Intent(getApplicationContext(),MainActivity.class);
              startActivity(i);
  
          } else if (id == R.id.puslitbangbun) {
              Intent i = new Intent(getApplicationContext(), Pemberlitri.class);
              startActivity(i);
  
          } else if (id == R.id.balittro) {
              Intent i = new Intent(getApplicationContext(), MainActivity.class);
              startActivity(i);
  
          } else if (id == R.id.balittri) {
              Intent i = new Intent(getApplicationContext(), MainActivity.class);
              startActivity(i);
  
          } else if (id == R.id.balittas) {
              Intent i = new Intent(getApplicationContext(), MainActivity.class);
              startActivity(i);
  
          } else if (id == R.id.balitpalma) {
              Intent i = new Intent(getApplicationContext(), MainActivity.class);
              startActivity(i);
  
          } else if (id == R.id.tentang) {
              Intent i = new Intent(getApplicationContext(),Tentang.class);
              startActivity(i);
  
          } else if (id == R.id.admin) {
              Intent i = new Intent(getApplicationContext(),Login.class);
              startActivity(i);
  
          } else if (id == R.id.logout) {
              AlertDialog.Builder builder = new AlertDialog.Builder(this);
              builder.setCancelable(true);
              builder.setMessage("Anda yakin ingin Logout?");
              builder.setPositiveButton("Ya", new DialogInterface.OnClickListener() {
                  @Override
                  public void onClick(DialogInterface dialog, int which) {
                      //if user pressed "yes", then he is allowed to exit from application
                      SharedPreferences.Editor editor = sharedpreferences.edit();
                      editor.putBoolean(Login.session_status, false);
                      editor.putString(TAG_ID, null);
                      editor.putString(TAG_USERNAME, null);
                      editor.apply();
  
                      startActivity(new Intent(HomeScreen.this, HomeScreen.class));
  
                  }
              });
              builder.setNegativeButton("Tidak", new DialogInterface.OnClickListener() {
                  @Override
                  public void onClick(DialogInterface dialog, int which) {
                      //if user select "No", just cancel this dialog and continue with app
                      dialog.cancel();
                  }
              });
              AlertDialog alert = builder.create();
              alert.show();
          }
  
          DrawerLayout drawer = findViewById(R.id.drawer_layout);
          drawer.closeDrawer(GravityCompat.START);
          return true;
      }
  }
  </code></pre>
  
  <p><strong>Slider.java</strong></p>
  
  <pre><code>import android.os.Bundle;
  import android.support.v7.app.AppCompatActivity;
  import android.util.Log;
  import android.widget.Toast;
  
  import com.daimajia.slider.library.Animations.DescriptionAnimation;
  import com.daimajia.slider.library.SliderLayout;
  import com.daimajia.slider.library.SliderTypes.BaseSliderView;
  import com.daimajia.slider.library.SliderTypes.TextSliderView;
  import com.daimajia.slider.library.Tricks.ViewPagerEx;
  
  import java.util.HashMap;
  
  public class Slider extends AppCompatActivity
          implements BaseSliderView.OnSliderClickListener,
          ViewPagerEx.OnPageChangeListener
  {
  
      SliderLayout sliderLayout ;
  
      HashMap&lt;String, String&gt; HashMapForURL ;
      HashMap&lt;String, Integer&gt; HashMapForLocalRes ;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.content_home_screen);
  
          sliderLayout = findViewById(R.id.slider);
  
          //Call this method if you want to add images from URL .
          //AddImagesUrlOnline();
  
          //Call this method to add images from local drawable folder .
          AddImageUrlFormLocalRes();
  
          //Call this method to stop automatic sliding.
          //sliderLayout.stopAutoCycle();
  
          for(String name : HashMapForLocalRes.keySet()){
  
              TextSliderView textSliderView = new TextSliderView(Slider.this);
  
              textSliderView
                      .description(name)
                      .image(HashMapForLocalRes.get(name))
                      .setScaleType(BaseSliderView.ScaleType.Fit)
                      .setOnSliderClickListener(this);
  
              textSliderView.bundle(new Bundle());
  
              textSliderView.getBundle()
                      .putString("extra",name);
  
              sliderLayout.addSlider(textSliderView);
          }
          sliderLayout.setPresetTransformer(SliderLayout.Transformer.DepthPage);
          sliderLayout.setPresetIndicator(SliderLayout.PresetIndicators.Center_Bottom);
          sliderLayout.setCustomAnimation(new DescriptionAnimation());
          sliderLayout.setDuration(3000);
          sliderLayout.startAutoCycle();
          sliderLayout.addOnPageChangeListener(Slider.this);
      }
  
      //@Override
      //protected void onStop() {
  
      //  sliderLayout.stopAutoCycle();
  
      //super.onStop();
      //}
  
      @Override
      public void onSliderClick(BaseSliderView slider) {
  
          Toast.makeText(this,slider.getBundle().get("extra") + "", Toast.LENGTH_SHORT).show();
      }
  
      @Override
      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}
  
      @Override
      public void onPageSelected(int position) {
  
          Log.d("Slider Demo", "Page Changed: " + position);
  
      }
  
      @Override
      public void onPageScrollStateChanged(int state) {
  
      }
  
      public void AddImagesUrlOnline(){
  
          HashMapForURL = new HashMap&lt;&gt;();
  
          HashMapForURL.put("CupCake", "http://androidblog.esy.es/images/cupcake-1.png");
          HashMapForURL.put("Donut", "http://androidblog.esy.es/images/donut-2.png");
          HashMapForURL.put("Eclair", "http://androidblog.esy.es/images/eclair-3.png");
          HashMapForURL.put("Froyo", "http://androidblog.esy.es/images/froyo-4.png");
          HashMapForURL.put("GingerBread", "http://androidblog.esy.es/images/gingerbread-5.png");
      }
  
      public void AddImageUrlFormLocalRes(){
  
          HashMapForLocalRes = new HashMap&lt;&gt;();
  
          HashMapForLocalRes.put("CupCake", R.drawable.bgall);
          HashMapForLocalRes.put("Donut", R.drawable.bgadmin);
          HashMapForLocalRes.put("Eclair", R.drawable.bgall);
          HashMapForLocalRes.put("Froyo", R.drawable.bgadmin);
          HashMapForLocalRes.put("GingerBread", R.drawable.bgall);
  
      }
  }
  </code></pre>