Android不错的开源项目

项目地址

https://github.com/codeestX/GeekNews

值得借鉴的地方

  1. 项目结构(MVP+Dagger2)
  2. Retrofit对多个baseUrl的管理
  3. realm的使用
  4. 侧边栏导航、tab导航的使用
  5. 单Activity+多Fragment的管理(基于me.yokeyword:fragmentation)
  6. 页面跳转共享资源的使用(列表->详情共享新闻图片)
  7. ==搜索框的使用,搜索时间的发布订阅处理逻辑==
  8. Logger的使用,见LogUtil
  9. 在Application中调用InitializeService,初始化了Logger,Bugly(错误收集+统计),LeakCanary(内存泄漏检测),BlockCanary(UI阻塞监控),tbs webview(腾讯webview服务)

解读

  1. RxBus事件总线

DailyPresenter的构造方法中有一个registerEvent方法

@Inject
public DailyPresenter(RetrofitHelper mRetrofitHelper,RealmHelper mRealHelper) {
    this.mRetrofitHelper = mRetrofitHelper;
    this.mRealmHelper = mRealHelper;
    registerEvent();
}

registerEvent()是订阅RxBus事件的

private void registerEvent() {
    Subscription rxSubscription = RxBus.getDefault().toObservable(CalendarDay.class)
            .subscribeOn(Schedulers.io())
            .map(new Func1() {
            ...

在DailyFragment中,发布RxBus事件

swipeRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
    @Override
    public void onRefresh() {
        if(currentDate.equals(DateUtil.getTomorrowDate())) {
            mPresenter.getDailyData();
        } else {
            int year = Integer.valueOf(currentDate.substring(0,4));
            int month = Integer.valueOf(currentDate.substring(4,6));
            int day = Integer.valueOf(currentDate.substring(6,8));
            CalendarDay date = CalendarDay.from(year, month - 1, day);
            RxBus.getDefault().post(date);
        }
    }
});
  1. DailyAdapter

有三种样式:图片滚动栏(类似于web的banner)、日期、新闻item

@Override
public int getItemViewType(int position) {
    if(!isBefore) {
        if(position == 0) {
            return ITEM_TYPE.ITEM_TOP.ordinal();
        } else if(position == 1) {
            return ITEM_TYPE.ITEM_DATE.ordinal();
        } else {
            return ITEM_TYPE.ITEM_CONTENT.ordinal();
        }
    } else {
        if(position == 0) {
            return ITEM_TYPE.ITEM_DATE.ordinal();
        } else {
            return ITEM_TYPE.ITEM_CONTENT.ordinal();
        }
    }
}

其中positi==0的就是图片滚动栏,由一个ViewPager实现,该ViewPager的Adapter是由另外一个Adapter持有的

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if(viewType == ITEM_TYPE.ITEM_TOP.ordinal()) {
        mAdapter = new TopPagerAdapter(mContext,mTopList);
        return new TopViewHolder(inflater.inflate(R.layout.item_top, parent, false));
    } else if(viewType == ITEM_TYPE.ITEM_DATE.ordinal()) {
        return new DateViewHolder(inflater.inflate(R.layout.item_date, parent, false));
    }
    return new ContentViewHolder(inflater.inflate(R.layout.item_daily, parent, false));
}
  1. compose的使用

可以少写切换线程的代码

@Override
public void getDailyData() {
    Subscription rxSubscription = mRetrofitHelper.fetchDailyListInfo()
            .compose(RxUtil.rxSchedulerHelper())
            ...
}

其中的compose主要是在io线程处理数据,ui线程处理结果

/**
 * 统一线程处理
 * @param 
 * @return
 */
public static  Observable.Transformer rxSchedulerHelper() {    //compose简化线程
    return new Observable.Transformer() {
        @Override
        public Observable call(Observable observable) {
            return observable.subscribeOn(Schedulers.io())
                    .observeOn(AndroidSchedulers.mainThread());
        }
    };
}
  1. 新闻的item点击进入detail时会共享新闻图片

xml如下


    ...

java如下

mAdapter.setOnItemClickListener(new DailyAdapter.OnItemClickListener() {
    @Override
    public void onItemClick(int position,View shareView) {
        mPresenter.insertReadToDB(mList.get(position).getId());
        mAdapter.setReadState(position,true);
        if(mAdapter.getIsBefore()) {
            mAdapter.notifyItemChanged(position + 1);
        } else {
            mAdapter.notifyItemChanged(position + 2);
        }
        Intent intent = new Intent();
        intent.setClass(mContext, ZhihuDetailActivity.class);
        intent.putExtra("id",mList.get(position).getId());
        ActivityOptions options = ActivityOptions.makeSceneTransitionAnimation(mActivity, shareView, "shareView");
        mContext.startActivity(intent,options.toBundle());
    }
});

detail中做如下处理

xml如下


    ...

java如下

(getWindow().getSharedElementEnterTransition()).addListener(new Transition.TransitionListener() {
    @Override
    public void onTransitionStart(Transition transition) {
    }
    @Override
    public void onTransitionEnd(Transition transition) {
        /**
         * 测试发现部分手机(如红米note2)上加载图片会变形,没有达到centerCrop效果
         * 查阅资料发现Glide配合SharedElementTransition是有坑的,需要在Transition动画结束后再加载图片
         * https://github.com/TWiStErRob/glide-support/blob/master/src/glide3/java/com/bumptech/glide/supportapp/github/_847_shared_transition/DetailFragment.java
         */
        isTransitionEnd = true;
        if (imgUrl != null) {
            isImageShow = true;
            ImageLoader.load(mContext, imgUrl, detailBarImage);
        }
    }
    @Override
    public void onTransitionCancel(Transition transition) {
    }
    @Override
    public void onTransitionPause(Transition transition) {
    }
    @Override
    public void onTransitionResume(Transition transition) {
    }
});

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