first commit

app/src/main/java/com/localtransfer/SectionsPagerAdapter.java

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+package com.localtransfer;
+
+import android.content.Context;
+
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentPagerAdapter;
+
+import com.localtransfer.fragment.DownloadFragment;
+import com.localtransfer.fragment.ProgressFragment;
+import com.localtransfer.fragment.UploadFragment;
+
+/**
+ * A [FragmentPagerAdapter] that returns a fragment corresponding to
+ * one of the sections/tabs/pages.
+ */
+public class SectionsPagerAdapter extends FragmentPagerAdapter {
+
+    @StringRes
+    private static final int[] TAB_TITLES = new int[]{R.string.download, R.string.upload, R.string.progress};
+    private final Context mContext;
+
+    public SectionsPagerAdapter(Context context, FragmentManager fm) {
+        super(fm);
+        mContext = context;
+    }
+
+    @Override
+    public Fragment getItem(int position) {
+        // getItem is called to instantiate the fragment for the given page.
+        // Return a PlaceholderFragment (defined as a static inner class below).
+        switch (position){
+            case 0: //Page number 1
+                return DownloadFragment.newInstance();
+            case 1: //Page number 2
+                return UploadFragment.newInstance();
+            case 2: //Page number 3
+                return ProgressFragment.newInstance();
+            default:
+                return null;
+        }
+    }
+
+    @Nullable
+    @Override
+    public CharSequence getPageTitle(int position) {
+        return mContext.getResources().getString(TAB_TITLES[position]);
+    }
+
+    @Override
+    public int getCount() {
+        return 3;
+    }
+}