首先先上效果图:
首先我们先考虑这个界面有什么难点:
1.日期悬停。
2.今日和其他日期在悬停布局上的处理
3.首次进入时,自动滑动到今日比赛
4.向上滑动向下滑动一定距离后,出现向上向下的图标,并滚动到今日的比赛界面
5.向上加载更多,向下加载更多,当然这个并不算是难点,只是比较新颖~。
好了,首先我们一项一项的开始解决这几个难点,首先这样的列表布局,强烈推荐大家使用RecyclerView,谷歌粑粑真的是赋予了它无穷的潜力。观看本文前依然推荐一波博客地址:点击打开链接一个头像狂魔的博客。
如果你已经看过了上篇博客,你可能会对这个界面已经有一定的了解,那么首先我们实现ItemDecoration的编写,首先我们应该考虑后台与我们交互时给出来的数据,一般为List或者Map格式,所以我们在编写时应充分考虑两种格式写法上的差异(其实也没什么差异的地方)。
public class HuPuItemDecoration<T extends HuPuBaseBean> extends RecyclerView.ItemDecoration { private int todayPosition; private List<T> mData; private Map<String, List<T>> mapData; private Paint mPaint; private int itemHeight; private int background; private int textSize; private int textColor; private Context context; private Rect outBounds = new Rect(); public HuPuItemDecoration(Context context, int todayPosition, List<T> mData) { this.context = context; this.todayPosition = todayPosition; this.mData = mData; mPaint = new Paint(); itemHeight = dip2px(context, 25); background = ContextCompat.getColor(context, android.R.color.darker_gray); textSize = sp2px(context, 15); textColor = ContextCompat.getColor(context, android.R.color.black); } public HuPuItemDecoration(Context context, int todayPosition, Map<String, List<T>> mapData) { this.context = context; this.todayPosition = todayPosition; this.mapData = mapData; mPaint = new Paint(); itemHeight = dip2px(context, 25); background = ContextCompat.getColor(context, android.R.color.darker_gray); textSize = sp2px(context, 15); textColor = ContextCompat.getColor(context, android.R.color.black); for (Map.Entry<String, List<T>> entry : mapData.entrySet()) { mData.addAll(entry.getValue()); } }
这里的HuPuBaseBean是一个bean类,内部实现了getDayType的方法,这里是基于封装而写出的基类,如果在实际项目中可以直接引入我们所需要的实体类来进行赋值。
初始化完成后,我们开始一步一步实现:代码很简单,一梭子给出来一部分先:
关于这部分方法的意义,推荐大家去鸿洋sama的博客去充值信仰!!!:点击打开链接
@Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { super.getItemOffsets(outRect, view, parent, state); int position = ((RecyclerView.LayoutParams) view.getLayoutParams()).getViewLayoutPosition(); if (null != mData && null != mapData) { throw new IllegalArgumentException("这里不会走到的,只是判断一下"); } if (position > -1) { if (position == 0) { outRect.set(0, itemHeight, 0, 0); } else { if (!mData.get(position).getDayType().equals(mData.get(position - 1).getDayType())) { outRect.set(0, itemHeight, 0, 0); } else { outRect.set(0, 0, 0, 0); } } } }
这里的代码逻辑比较简单,就是当position==0时,我们必然会有一个divider去标识日期,而后当前的type不等于它所在位置的上一个position的type时,这时两个position所在的view中间应有一个divider来进行标识!这部分代码非常的简单,我们继续一梭子撸下面的代码:
@Override public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { super.onDraw(c, parent, state); int left = parent.getPaddingLeft(); int right = parent.getRight() - parent.getPaddingRight(); int count = parent.getChildCount(); for (int i = 0; i < count; i++) { View child = parent.getChildAt(i); RecyclerView.LayoutParams lp = (RecyclerView.LayoutParams) child.getLayoutParams(); int position = lp.getViewLayoutPosition(); if (position == 0) { mPaint.setColor(background); c.drawRect(left, child.getTop() - itemHeight - lp.topMargin, right, child.getTop() - lp.topMargin, mPaint); mPaint.setColor(textColor); mPaint.setTextSize(textSize); String type = mData.get(position).getDayType(); mPaint.getTextBounds(type, 0, type.length(), outBounds); c.drawText(type, child.getRight() / 2 - outBounds.width() / 2, child.getTop() - lp.topMargin -
(itemHeight / 2 - outBounds.height() / 2), mPaint); } else { if (!mData.get(position).getDayType().equals(mData.get(position - 1).getDayType())) { mPaint.setColor(background); c.drawRect(left, child.getTop() - itemHeight - lp.topMargin, right, child.getTop() - lp.topMargin, mPaint); if (position == todayPosition) { mPaint.setColor(Color.RED); c.drawRect(left, child.getTop() - itemHeight - lp.topMargin, 15, child.getTop() - lp.topMargin, mPaint); } mPaint.setColor(background); mPaint.setTextSize(textSize); mPaint.setColor(textColor); String type = mData.get(position).getDayType(); mPaint.getTextBounds(type, 0, type.length(), outBounds); c.drawText(type, child.getRight() / 2 - outBounds.width() / 2, child.getTop() -
lp.topMargin - (itemHeight / 2 - outBounds.height() / 2), mPaint); } else { } } } }
这部分代码其实跟上面的代码在逻辑上非常接近,如果你已经看了最上面的博客链接,这里的逻辑你应该也能看得懂,这里和推荐博客在这里并没有什么不同,如果这里有任何疑问,我强烈大家去推荐博客那里去看详细的解释,(什么是甩锅,这就叫甩锅)。
最后一段代码:
@Override public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) { super.onDrawOver(c, parent, state); int position = ((LinearLayoutManager) parent.getLayoutManager()).findFirstVisibleItemPosition(); View itemView = parent.findViewHolderForAdapterPosition(position).itemView; if (mData.size() - 1 >= position) { if (!mData.get(position).getDayType().equals(mData.get(position + 1).getDayType())) { if (itemView.getHeight() + itemView.getTop() < itemHeight) { c.translate(0, itemView.getHeight() + itemView.getTop() - itemHeight); } } } mPaint.setColor(background); c.drawRect(parent.getPaddingLeft(), parent.getPaddingTop(), parent.getRight() - parent.getPaddingRight(),
parent.getPaddingTop() + itemHeight, mPaint); if (position >= todayPosition && mData.get(todayPosition).getDayType().equals(mData.get(position).getDayType())) { mPaint.setColor(Color.RED); c.drawRect(parent.getPaddingLeft(), parent.getPaddingTop(), 15, parent.getPaddingTop() + itemHeight, mPaint); } mPaint.setColor(textColor); mPaint.setTextSize(textSize); String dayType = mData.get(position).getDayType(); mPaint.getTextBounds(dayType, 0, dayType.length(), outBounds); c.drawText(dayType, (parent.getRight() - parent.getPaddingRight() - parent.getPaddingLeft() - outBounds.width()) / 2,
parent.getPaddingTop() + itemHeight - (itemHeight / 2 - outBounds.height() / 2), mPaint); }
这里就是做悬停部分的代码,这里唯一需要注意的就是我们对于今日比赛悬停界面的处理。
if (position >= todayPosition && mData.get(todayPosition).getDayType().equals(mData.get(position).getDayType())) { mPaint.setColor(Color.RED); c.drawRect(parent.getPaddingLeft(), parent.getPaddingTop(), 15, parent.getPaddingTop() + itemHeight, mPaint); }
如果当前的position大于等于我们传过来的todayPos,然后type相等,既判定为今日比赛。其他则无视之。
写完了这部分代码后,我们就简单写一个RecyclerView出来:
rv = (RecyclerView) findViewById(R.id.rv); top= (ImageView) findViewById(R.id.top); bottom= (ImageView) findViewById(R.id.bottom); for (int i = 0; i < 10; i++) { HuPuBean bean = new HuPuBean("雷霆", "火箭", "早上8:00", 124, 100, "昨日", false); mData.add(bean); } for (int i = 0; i < 10; i++) { HuPuBean bean = new HuPuBean("雷霆", "火箭", "早上8:00", 124, 100, "今日", true); mData.add(bean); } for (int i = 0; i < 10; i++) { HuPuBean bean = new HuPuBean("雷霆", "火箭", "早上8:00", 124, 100, "明日", true); mData.add(bean); } rv.addItemDecoration(new HuPuItemDecoration<HuPuBean>(MainActivity.this, Utils.getTodayPosition("今日", mData), mData)); final LinearLayoutManager manger = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false); rv.setLayoutManager(manger); rv.setAdapter(new RecyclerView.Adapter<Holder>() { @Override public Holder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(MainActivity.this).inflate(R.layout.item, parent, false); return new Holder(itemView); } @Override public void onBindViewHolder(Holder holder, int position) { HuPuBean bean = mData.get(position); holder.teamOne.setText(bean.getTeamOne()); holder.teamTwo.setText(bean.getTeamTwo()); holder.teamOnePoint.setText("" + bean.getTeamOnePoint()); holder.teamOnePoint.setText("" + bean.getTeamTwoPoint()); } @Override public int getItemCount() { return mData.size(); } });
这里代码写得比较粗糙,勿怪。
然后我们来看一下效果图。
我们来看一下utils方法,也非常简单,因为涉及到加载刷新的逻辑,todayPostion的位置会发生改变,不建议使用赋值,
public class Utils { public static int getTodayPosition(String type, List<? extends HuPuBaseBean> mData) { for (int i = 0; i < mData.size(); i++) { if (mData.get(i).getDayType().equals(type)) { return i; } } return 0; } }
最后我们来处理上滑下滑时top bottom图片的显示隐藏:
首先我们看MianActivity的布局:
<Frame Layout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <android.support.v7.widget.RecyclerView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/rv" ></android.support.v7.widget.RecyclerView> <ImageView android:layout_width="50dp" android:layout_height="50dp" android:layout_gravity="right" android:layout_marginTop="20dp" android:layout_marginRight="20dp" android:id="@+id/bottom" android:background="@mipmap/ic_launcher" android:visibility="gone" /> <ImageView android:layout_width="50dp" android:layout_height="50dp" android:layout_gravity="bottom|right" android:layout_marginBottom="20dp" android:layout_marginRight="20dp" android:id="@+id/top" android:background="@mipmap/ic_launcher" android:visibility="gone" /> </Frame Layout>
然后通过RecyclerView的对滑动监听来实现两张图片的显示和隐藏:
rv.addOnScrollListener(new RecyclerView.OnScrollListener() { @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); int position = manger.findFirstVisibleItemPosition(); if(position-Utils.getTodayPosition("今日",mData)>=10){ bottom.setVisibility(View.GONE); top.setVisibility(View.VISIBLE); }else if(position-Utils.getTodayPosition("今日",mData)<=-10){ bottom.setVisibility(View.VISIBLE); top.setVisibility(View.GONE); }else { bottom.setVisibility(View.GONE); top.setVisibility(View.GONE); } } });
当然这种实现方式是最常见的,不过我们还可以通过自定义behavior这种方式来实现滑动的联动效果,但是本篇就不在这里实现了。
最后首次加载滑动到今日比赛,和点击图片滑动到今日比赛,其实非常简单,一行代码搞定:
manger.scrollToPositionWithOffset(Utils.getTodayPosition("今日", mData), 0);
至此,基本的虎扑看球页面的效果就已经实现了,是不是非常简单,当然虎扑的页面更加复杂,itemType有数种,这里就不再实现了。最后去愉快的水群了。临走前在发一张我老婆的美图: