MainActivity.java

package com.troy.xifan.activity;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.IdRes;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.widget.FrameLayout;
import butterknife.BindView;
import butterknife.ButterKnife;
import com.chenenyu.router.annotation.Route;
import com.troy.xifan.App;
import com.troy.xifan.R;
import com.troy.xifan.config.Constants;
import com.troy.xifan.eventbus.NotificationEvent;
import com.troy.xifan.fragment.HomeFragment;
import com.troy.xifan.fragment.MessageFragment;
import com.troy.xifan.fragment.ProfileFragment;
import com.troy.xifan.fragment.SearchFragment;
import com.troy.xifan.http.HttpRequestFactory;
import com.troy.xifan.http.callback.SimpleHttpRequestCallback;
import com.troy.xifan.http.exception.ApiException;
import com.troy.xifan.http.request.BaseRequestParams;
import com.troy.xifan.model.response.UserRes;
import com.troy.xifan.service.NotificationService;
import com.troy.xifan.util.SharedPreUtils;
import it.sephiroth.android.library.bottomnavigation.BadgeProvider;
import it.sephiroth.android.library.bottomnavigation.BottomNavigation;
import java.util.ArrayList;
import java.util.List;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;

@Route(Constants.Router.MAIN)
public class MainActivity extends BaseActivity
        implements BottomNavigation.OnMenuItemSelectionListener {
    public static final String EXTRA_NEW_MSG = "new_msg";

    @BindView(R.id.navigation_view) BottomNavigation mBottomNavigationView;
    @BindView(R.id.fragment_container) FrameLayout mFrameLayout;

    private FragmentManager mFragmentManager;
    private List<Fragment> mFragmentList = new ArrayList<>();
    private BadgeProvider mBadgeProvider;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        initViews();
        getUserInfo();
        EventBus.getDefault().register(this);

        //避免重复add fragment
        if (savedInstanceState == null) {
            initFragments();
        }

        startService(new Intent(this, NotificationService.class));
    }

    @Override
    public void initViews() {
        mBottomNavigationView.setOnMenuItemClickListener(this);
        mBottomNavigationView.setDefaultSelectedIndex(0);
        mBadgeProvider = mBottomNavigationView.getBadgeProvider();
        showBadge();
    }

    private void initFragments() {
        mFragmentManager = getSupportFragmentManager();
        mFragmentList.add(HomeFragment.newInstance());
        mFragmentList.add(MessageFragment.newInstance());
        mFragmentList.add(SearchFragment.newInstance());
        mFragmentList.add(ProfileFragment.newInstance());

        //默认选中主页
        mFragmentManager.beginTransaction()
                .add(R.id.fragment_container, mFragmentList.get(0))
                .commit();
    }

    private void hideFragments(FragmentTransaction fragmentTransaction) {
        for (Fragment fragment : mFragmentList) {
            fragmentTransaction.hide(fragment);
        }
    }

    @Subscribe
    public void onMessageNotifi(NotificationEvent event) {
        mBadgeProvider.show(R.id.action_message);
    }

    public void removeMessageBadge() {
        if (mBadgeProvider.hasBadge(R.id.action_message)) {
            mBadgeProvider.remove(R.id.action_message);
        }
    }

    @Override
    public void onMenuItemSelect(@IdRes final int itemId, final int position,
            final boolean fromUser) {
        FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
        Fragment fragment = mFragmentList.get(position);
        hideFragments(fragmentTransaction);
        if (!fragment.isAdded()) {
            fragmentTransaction.add(R.id.fragment_container, fragment);
        }
        fragmentTransaction.show(fragment);
        fragmentTransaction.commit();
    }

    @Override
    public void onMenuItemReselect(@IdRes final int itemId, final int position,
            final boolean fromUser) {
    }

    private void showBadge() {
        boolean hasNewMsg = getIntent().getBooleanExtra(EXTRA_NEW_MSG, false);
        if (hasNewMsg) {
            mBadgeProvider.show(R.id.action_message);
        }
    }

    //获取用户信息
    private void getUserInfo() {
        BaseRequestParams request = new BaseRequestParams();
        HttpRequestFactory.getInstance()
                .getUserInfo(request, new SimpleHttpRequestCallback<UserRes>() {
                    @Override
                    public void onSuccess(UserRes userRes) {
                        App.getInstance().setUser(userRes);
                        SharedPreUtils.pusString(Constants.SharedPreferences.KEY_USER_ID,
                                userRes.getId());
                    }

                    @Override
                    public void onFail(ApiException apiException) {
                    }
                });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        EventBus.getDefault().unregister(this);
    }
}