Blog Fragment in Navigation Drawer with Tabs

This replaces the custom layouts in the navigation drawer with a
`NavigationView` and adds a menu entry for Blogs.

A Main Blogs fragment is added that holds a `TabLayout` and a
`ViewPager`. Five tabs are already added, but they just have a single
placeholder fragment that is to be replaced by the actual fragments.

Closes #409

briar-android/src/org/briarproject/android/blogs/BlogsFragment.java

@@ -0,0 +1,104 @@
+package org.briarproject.android.blogs;
+
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.design.widget.TabLayout;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentStatePagerAdapter;
+import android.support.v4.view.ViewPager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import org.briarproject.R;
+import org.briarproject.android.fragment.BaseFragment;
+
+import javax.inject.Inject;
+
+public class BlogsFragment extends BaseFragment {
+
+	public final static String TAG = BlogsFragment.class.getName();
+
+	// TODO add your first fragment here
+	//@Inject
+	//Lazy<MyBlogsFragment> myBlogsFragment;
+
+	private static final String SELECTED_TAB = "selectedTab";
+	private TabLayout tabLayout;
+
+	@Inject
+	public BlogsFragment() {
+	}
+
+	@Nullable
+	@Override
+	public View onCreateView(LayoutInflater inflater, ViewGroup container,
+			Bundle savedInstanceState) {
+
+		View v = inflater.inflate(R.layout.fragment_blogs, container,
+				false);
+
+		tabLayout = (TabLayout) v.findViewById(R.id.tabLayout);
+		ViewPager viewPager = (ViewPager) v.findViewById(R.id.pager);
+
+		String[] titles = {
+				getString(R.string.blogs_feed),
+				getString(R.string.blogs_my_blogs),
+				getString(R.string.blogs_blog_list),
+				getString(R.string.blogs_available_blogs),
+				getString(R.string.blogs_drafts)
+		};
+		TabAdapter tabAdapter =
+				new TabAdapter(getChildFragmentManager(), titles);
+		viewPager.setAdapter(tabAdapter);
+		tabLayout.setupWithViewPager(viewPager);
+
+		if (savedInstanceState != null) {
+			int position = savedInstanceState.getInt(SELECTED_TAB, 0);
+			viewPager.setCurrentItem(position);
+		}
+		return v;
+	}
+
+	@Override
+	public void onSaveInstanceState(Bundle outState) {
+		super.onSaveInstanceState(outState);
+		outState.putInt(SELECTED_TAB, tabLayout.getSelectedTabPosition());
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+
+	private static class TabAdapter extends FragmentStatePagerAdapter {
+		private String[] titles;
+
+		TabAdapter(FragmentManager fm, String[] titles) {
+			super(fm);
+			this.titles = titles;
+		}
+
+		@Override
+		public int getCount() {
+			return titles.length;
+		}
+
+		@Override
+		public Fragment getItem(int position) {
+			switch (position) {
+				// TODO add your fragments here
+				default:
+					return MyBlogsFragment.newInstance(position);
+			}
+		}
+
+		@Override
+		public CharSequence getPageTitle(int position) {
+			return titles[position];
+		}
+	}
+
+}

briar-android/src/org/briarproject/android/blogs/MyBlogsFragment.java

@@ -0,0 +1,55 @@
+package org.briarproject.android.blogs;
+
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import org.briarproject.R;
+import org.briarproject.android.fragment.BaseFragment;
+
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+public class MyBlogsFragment extends BaseFragment {
+
+	public final static String TAG = MyBlogsFragment.class.getName();
+
+	@Inject
+	public MyBlogsFragment() {
+	}
+
+	static MyBlogsFragment newInstance(int num) {
+		MyBlogsFragment f = new MyBlogsFragment();
+
+		Bundle args = new Bundle();
+		args.putInt("num", num);
+		f.setArguments(args);
+
+		return f;
+	}
+
+	@Nullable
+	@Override
+	public View onCreateView(LayoutInflater inflater, ViewGroup container,
+			Bundle savedInstanceState) {
+
+		View v = inflater.inflate(R.layout.fragment_blogs_my, container,
+				false);
+
+		TextView numView = (TextView) v.findViewById(R.id.num);
+		String num = String.valueOf(getArguments().getInt("num"));
+		numView.setText(num);
+
+		return v;
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+}