NewsFeedFactory.java

package com.gh4a.activities.home;

import android.content.Context;
import android.support.annotation.StringRes;
import android.support.v4.app.Fragment;
import android.support.v4.content.Loader;
import android.support.v4.view.MenuItemCompat;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;

import com.gh4a.R;
import com.gh4a.fragment.PrivateEventListFragment;
import com.gh4a.loader.LoaderCallbacks;
import com.gh4a.loader.LoaderResult;
import com.gh4a.loader.OrganizationListLoader;
import com.gh4a.utils.AvatarHandler;

import org.eclipse.egit.github.core.User;

import java.util.List;

public class NewsFeedFactory extends FragmentFactory implements Spinner.OnItemSelectedListener {
    private String mUserLogin;
    private User mSelf;
    private User mSelectedOrganization;
    private List<User> mUserScopes;

    private static final int[] TAB_TITLES = new int[] {
        R.string.user_news_feed
    };

    @SuppressWarnings("FieldCanBeLocal")
    private LoaderCallbacks<List<User>> mOrganizationCallback =
            new LoaderCallbacks<List<User>>(mActivity) {
        @Override
        protected Loader<LoaderResult<List<User>>> onCreateLoader() {
            return new OrganizationListLoader(mActivity, mUserLogin);
        }

        @Override
        protected void onResultReady(List<User> result) {
            mUserScopes = result != null && result.size() > 0 ? result : null;
            mActivity.supportInvalidateOptionsMenu();
        }
    };

    public NewsFeedFactory(HomeActivity activity, String userLogin) {
        super(activity);
        mUserLogin = userLogin;

        mActivity.getSupportLoaderManager().initLoader(100, null, mOrganizationCallback);
    }

    @Override
    public @StringRes int getTitleResId() {
        return R.string.user_news_feed;
    }

    @Override
    protected int[] getTabTitleResIds() {
        return TAB_TITLES;
    }

    @Override
    protected Fragment makeFragment(int position) {
        return PrivateEventListFragment.newInstance(mUserLogin,
                mSelectedOrganization != null ? mSelectedOrganization.getLogin() : null);
    }

    @Override
    protected void setUserInfo(User user) {
        mSelf = user;
        mActivity.supportInvalidateOptionsMenu();
    }

    @Override
    protected boolean onCreateOptionsMenu(Menu menu) {
        if (mUserScopes == null || mSelf == null) {
            return super.onCreateOptionsMenu(menu);
        }

        mActivity.getMenuInflater().inflate(R.menu.user_selector, menu);

        Spinner spinner = (Spinner) MenuItemCompat.getActionView(menu.findItem(R.id.selector));
        UserAdapter adapter = new UserAdapter(mActivity, mSelf, mUserScopes);
        spinner.setAdapter(adapter);
        spinner.setGravity(Gravity.RIGHT);
        spinner.setOnItemSelectedListener(this);

        return true;
    }

    @Override
    protected void onRefresh() {
        Loader loader = mActivity.getSupportLoaderManager().getLoader(100);
        if (loader != null) {
            loader.onContentChanged();
        }
        mSelf = null;
        mUserScopes = null;
        mActivity.supportInvalidateOptionsMenu();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mActivity.getSupportLoaderManager().destroyLoader(100);
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        mSelectedOrganization = position != 0 ? mUserScopes.get(position - 1) : null;
        mActivity.invalidateFragments();

    }

    @Override
    public void onNothingSelected(AdapterView<?> view) {
        mSelectedOrganization = null;
        mActivity.invalidateFragments();
    }

    private static class UserAdapter extends BaseAdapter {
        private final User mSelf;
        private final List<User> mUsers;
        private final LayoutInflater mInflater;

        public UserAdapter(Context context, User self, List<User> users) {
            super();
            mInflater = LayoutInflater.from(context);
            mSelf = self;
            mUsers = users;
        }

        @Override
        public int getCount() {
            return mUsers.size() + 1;
        }

        @Override
        public User getItem(int position) {
            return position == 0 ? mSelf : mUsers.get(position - 1);
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.user_type_small, parent, false);
            }

            User user = getItem(position);
            ImageView avatar = (ImageView) convertView;
            AvatarHandler.assignAvatar(avatar, user);

            return convertView;
        }

        @Override
        public View getDropDownView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.user_type_popup, parent, false);
            }

            User user = getItem(position);

            ImageView avatar = (ImageView) convertView.findViewById(R.id.iv_gravatar);
            AvatarHandler.assignAvatar(avatar, user);

            TextView nameView = (TextView) convertView.findViewById(R.id.tv_title);
            nameView.setText(user.getLogin());

            return convertView;
        }
    }
}