Remove duplicate ViewPagerAdapter (#4222)

app/src/main/java/fr/free/nrw/commons/ViewPagerAdapter.java

@@ -0,0 +1,57 @@
+package fr.free.nrw.commons;
+
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentPagerAdapter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * This adapter will be used to display fragments in a ViewPager
+ */
+public class ViewPagerAdapter extends FragmentPagerAdapter {
+    private List<Fragment> fragmentList = new ArrayList<>();
+    private List<String> fragmentTitleList = new ArrayList<>();
+
+    public ViewPagerAdapter(FragmentManager manager) {
+        super(manager);
+    }
+
+    /**
+     * This method returns the fragment of the viewpager at a particular position
+     * @param position
+     */
+    @Override
+    public Fragment getItem(int position) {
+        return fragmentList.get(position);
+    }
+
+    /**
+     * This method returns the total number of fragments in the viewpager.
+     * @return size
+     */
+    @Override
+    public int getCount() {
+        return fragmentList.size();
+    }
+
+    /**
+     * This method sets the fragment and title list in the viewpager
+     * @param fragmentList List of all fragments to be displayed in the viewpager
+     * @param fragmentTitleList List of all titles of the fragments
+     */
+    public void setTabData(List<Fragment> fragmentList, List<String> fragmentTitleList) {
+        this.fragmentList = fragmentList;
+        this.fragmentTitleList = fragmentTitleList;
+    }
+
+    /**
+     * This method returns the title of the page at a particular position
+     * @param position
+     */
+    @Override
+    public CharSequence getPageTitle(int position) {
+        return fragmentTitleList.get(position);
+    }
+}