手机助手（四）：复杂的ListView + 自定义控件

简介

分类+热门。分类涉及的知识点：复杂的listview，热门涉及的知识点：自定义控件。

效果图

分类 ClassifyFrag

复杂的listview的adapter比一般的多了2个方法，而且在getView（）中需要判断是不是是哪个view

ListView的type是固定的，头是0，其他事1，而且数字应该连续。但是RecycerView不需要连续。

public static final int ViewTypeHead = 0;// 标题public static final int ViewTypeInfo = 1;// item info

//返回viewtype@Overridepublic int getItemViewType(int position) {    Object object = list.get(position);    if (object instanceof String) {// 头 标题        return ViewTypeHead;    } else {        return ViewTypeInfo;    }}//item有几种类型@Overridepublic int getViewTypeCount() {    return 2;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {    switch (getItemViewType(position)) {    case ViewTypeHead:        ...        break;    case ViewTypeInfo:            ....        break;    }    return convertView;}

在给ListView设置点击事件的时候，也需要判断ViewType.如果是head，这该itemView不让点击。

listView.setOnItemClickListener(new OnItemClickListener() {    @Override    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {        int itemViewType = adapter.getItemViewType(position);        if (itemViewType == ClassifyFragAdapter.ViewTypeInfo) {            view.setClickable(true);            //无效，adapter中给子view设置了点击事件监听            ToastUtil.showShortToast("" + position + adapter.getItemId(position));        } else {            view.setClickable(false);        }    }});

我们给itemView中的子view设置了点击事件

@Overridepublic View getView(int position, View convertView, ViewGroup parent) {    switch (getItemViewType(position)) {    case ViewTypeHead:        if (convertView == null) {            convertView = View.inflate(parent.getContext(), R.layout.item_title_classify_frag, null);        }        TextView tv_title = (TextView) convertView.findViewById(R.id.tv_title_classify_frag);        tv_title.setText("" + list.get(position));        break;    case ViewTypeInfo:        ViewHolder holder;        if (convertView == null) {            convertView = View.inflate(parent.getContext(), R.layout.item_info_classify_frag, null);            holder = new ViewHolder(convertView);            convertView.setTag(holder);        } else {            holder = (ViewHolder) convertView.getTag();        }        ClassicfyInfoBean info = (ClassicfyInfoBean) list.get(position);        // item的第一个        holder.tv_name1.setText(info.getName1());        ImageLoader.getInstance().displayImage(NetUrl.IMAGE_PREFIX + info.getUrl1(), holder.iv1, ImageLoaderOptions.options);        // item的第2个        if (TextUtils.isEmpty(info.getName2())) {            holder.ll2.setVisibility(View.INVISIBLE);        } else {            holder.ll2.setVisibility(View.VISIBLE);            holder.tv_name2.setText(info.getName2());            ImageLoader.getInstance().displayImage(NetUrl.IMAGE_PREFIX + info.getUrl2(), holder.iv2, ImageLoaderOptions.options);        }        // item的第3个        if (TextUtils.isEmpty(info.getName3())) {            holder.ll3.setVisibility(View.INVISIBLE);        } else {            holder.ll3.setVisibility(View.VISIBLE);            holder.tv_name3.setText(info.getName3());            ImageLoader.getInstance().displayImage(NetUrl.IMAGE_PREFIX + info.getUrl3(), holder.iv3, ImageLoaderOptions.options);        }        initOnclickListener(holder,info);        break;    }

给每一个layout设置点击事件：

private void initOnclickListener(ViewHolder holder,final ClassicfyInfoBean info) {    holder.ll1.setOnClickListener(new OnClickListener() {        @Override        public void onClick(View v) {            ToastUtil.showShortToast(""+info.getName1());        }    });    holder.ll2.setOnClickListener(new OnClickListener() {        @Override        public void onClick(View v) {            ToastUtil.showShortToast(""+info.getName2());        }    });    holder.ll3.setOnClickListener(new OnClickListener() {        @Override        public void onClick(View v) {            ToastUtil.showShortToast(""+info.getName3());        }    });}

热门：HotFrag

FlowLayout自定义控件

public class FlowLayout extends ViewGroup {    private int horizontalSpacing = 12;// 一行中childView的水平间距    private int verticalSpacing = 12;// 行与行之间的垂直间距    // 用来存放每一行的Line对象    private ArrayList<Line> lineList = new ArrayList<FlowLayout.Line>();    public FlowLayout(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    public FlowLayout(Context context, AttributeSet attrs) {        super(context, attrs);    }    public FlowLayout(Context context) {        super(context);    }    /**     * 设置水平间距     *      * @param horizontalSpacing     * @return     */    public void setHorizontalSpacing(int horizontalSpacing) {        this.horizontalSpacing = horizontalSpacing;    }    /**     * 设置垂直间距     *      * @param horizontalSpacing     * @return     */    public void setVerticalSpacing(int verticalSpacing) {        this.verticalSpacing = verticalSpacing;    }    /**     * 在onMeasure方法中，进行分行操作,相当于排好了座位表     */    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);// 给当前控件设置默认宽高        // 1.根据widthMeasureSpec获取控件的总宽度        int width = MeasureSpec.getSize(widthMeasureSpec);        // 2.获取实际比较的宽度，就是减去左右padding的宽度        int noPaddingWidth = width - getPaddingLeft() - getPaddingRight();        // 3.遍历所有的子View，进行具体的分行逻辑        Line line = null;        for (int i = 0; i < getChildCount(); i++) {            View childView = getChildAt(i);// 获取当前的子View            // 引起childView的onMeasure方法回调，            childView.measure(0, 0);// 如果传入0，则会按照控件本身的宽高参数去测量            // 初始化Line对象            if (line == null) {                line = new Line();// 如果不换行，则Line对象始终是同一个Line对象            }            // 4.如果line中没有子View，则直接添加childView,不需要比较宽度            if (line.getViewList().size() == 0) {                line.addChildView(childView);            } else if (line.getWidth() + horizontalSpacing + childView.getMeasuredWidth() > noPaddingWidth) {                // 5.如果当前line的宽+水平间距+childView的宽 大于noPaddingWidth，则需要换行                lineList.add(line);// 先保存之前的Line对象，                line = new Line();// 创建新的Line                line.addChildView(childView);// 将childView放入新的Line中            } else {                // 6.childView属于当前Line，则直接将childView加入到当前line中                line.addChildView(childView);            }            // 7.如果当前childView是最后一个，则需要保存最后的line对象，否则for循环结束，则最后的line会丢失            if (i == (getChildCount() - 1)) {                // 保存最后的line对象                lineList.add(line);            }        }        // for循环结束了，lineList存放了所有的line对象，line对象又存放每行的子View        // 由于需要在垂直方向摆放所有的line的所有子View，所以需要计算高度        int height = getPaddingTop() + getPaddingBottom();// 先算上上下的padding        // 再计算所有的line的高度        for (int i = 0; i < lineList.size(); i++) {            height += lineList.get(i).getHeight();        }        // 最后再加上所有line之间的垂直间距        height += (lineList.size() - 1) * verticalSpacing;        setMeasuredDimension(width, height);// 设置flowLayout的宽高    }    /**     * 让所有子View摆放到自己的位置上     */    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        int paddingLeft = getPaddingLeft();        int paddingTop = getPaddingTop();        for (int i = 0; i < lineList.size(); i++) {            Line line = lineList.get(i);// 获取每个line对象            // 偏移下面的所有line:从第二行开始，总是比上一行的top多一个行高和垂直间距            if (i > 0) {                paddingTop += lineList.get(i - 1).getHeight() + verticalSpacing;            }            ArrayList<View> viewList = line.getViewList();// 获取line的viewList            // 获取当前line的留白            float lineRemainSpacing = getLineRemainSpacing(line);            // 计算每个子View能够平均分配多少            float perSpacing = lineRemainSpacing / viewList.size();            // 遍历viewList，去摆放每一个子View            for (int j = 0; j < viewList.size(); j++) {                View childView = viewList.get(j);// 获取每一个子View对象                // 将每个子View得到的留白，增加到它原来的宽度上面                int widthMeasureSpec = MeasureSpec.makeMeasureSpec((int) (childView.getMeasuredWidth() + perSpacing),                        MeasureSpec.EXACTLY);                childView.measure(widthMeasureSpec, 0);                if (j == 0) {                    // 摆放的是第一个子View                    childView.layout(paddingLeft, paddingTop, paddingLeft + childView.getMeasuredWidth(), paddingTop                            + childView.getMeasuredHeight());                } else {                    // 摆放后面的子View，可以参考前一个子View                    View preView = viewList.get(j - 1);// 获取前一个子View对象                    int left = preView.getRight() + horizontalSpacing;// 获取当前view的left                    childView.layout(left, preView.getTop(), left + childView.getMeasuredWidth(), preView.getBottom());                }            }        }    }    /**     * 获取指定line的是留白区域     */    private float getLineRemainSpacing(Line line) {        return getMeasuredWidth() - getPaddingLeft() - getPaddingRight() - line.getWidth();    }    /**     * 封装每一行的数据     *      * @author Administrator     *      */    class Line {        private ArrayList<View> viewList;// 用来记录当前行的所有的TextView        private int width;// 表示当前line中所有子View的宽度+水平间距        private int height;// 当前的line高度        public Line() {            viewList = new ArrayList<View>();// 初始化子View的集合        }        /**         * 添加子View的方法         *          * @param childView         */        public void addChildView(View childView) {            if (!viewList.contains(childView)) {                // 每添加一个childVIew，都需要更新width                if (viewList.size() == 0) {                    // 说明当前还能没有子View，则width应该是childView的宽度                    width = childView.getMeasuredWidth();                } else {                    // 说明当前已经有子View，则再次添加childVIew，需要多加一个水平间距                    width += childView.getMeasuredWidth() + horizontalSpacing;                }                // 更新高度, 最好是子View高度最大的那个高度                // height =                // height>childView.getMeasuredHeight()?height:childView.getMeasuredHeight();                height = Math.max(height, childView.getMeasuredHeight());                viewList.add(childView);// 将childView存放到list中            }        }        /**         * 获取当前line的宽度         * @return         */        public int getWidth() {            return width;        }        /**         * 获取当前line的高度         * @return         */        public int getHeight() {            return height;        }        /**         * 获取当line的子View的集合         * @return         */        public ArrayList<View> getViewList() {            return viewList;        }    }}

HotFrag

public class HotFrag extends Fragment {    private ContentPager contentPager;    private int text_h_padding;    private int text_v_padding;    private int hot_text_radius;    private FlowLayout flowLayout;    private ScrollView scrollView;    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        contentPager = new ContentPager(getActivity()) {            @Override            public Object requestData() {                return getData();            }            @Override            public View createSuccessView() {                return getSuccessView();            }        };        return contentPager;    }    protected View getSuccessView() {        int flowlayout_padding = (int) CommonUtil.getDimension(R.dimen.flowlayout_padding);        int flowlayout_h_spacing = (int) CommonUtil.getDimension(R.dimen.flowlayout_h_spacing);        int flowlayout_v_spacing = (int) CommonUtil.getDimension(R.dimen.flowlayout_v_spacing);        scrollView = new ScrollView(getActivity());        flowLayout = new FlowLayout(getActivity());        flowLayout.setPadding(flowlayout_padding, flowlayout_padding, flowlayout_padding, flowlayout_padding);        flowLayout.setHorizontalSpacing(flowlayout_h_spacing);        flowLayout.setVerticalSpacing(flowlayout_v_spacing);        scrollView.addView(flowLayout);        return scrollView;    }    protected Object getData() {        text_h_padding = (int) CommonUtil.getDimension(R.dimen.text_h_padding);        text_v_padding = (int) CommonUtil.getDimension(R.dimen.text_v_padding);        hot_text_radius = (int) CommonUtil.getDimension(R.dimen.hot_text_radius);        String json = HttpHelper.get(NetUrl.HOT);        List<String> list = (List<String>) GsonUtil.jsonToList(json, new TypeToken<List<String>>() {        }.getType());        if (list.size() != 0 && list != null) {            for (int i = 0; i < list.size(); i++) {                final TextView tv = new TextView(getActivity());                tv.setPadding(text_h_padding, text_v_padding, text_h_padding, text_v_padding);                tv.setText(list.get(i));                tv.setTextSize(TypedValue.COMPLEX_UNIT_SP,14);                tv.setTextColor(Color.WHITE);                tv.setGravity(Gravity.CENTER);                GradientDrawable normal = DrawableUtil.getDrawable(ColorUtil.getRandomColor(), hot_text_radius);                GradientDrawable pressed = DrawableUtil.getDrawable(ColorUtil.getRandomColor(), hot_text_radius);                tv.setBackgroundDrawable(DrawableUtil.getSelector(pressed, normal));                flowLayout.addView(tv);                tv.setOnClickListener(new OnClickListener() {                    @Override                    public void onClick(View v) {                        ToastUtil.showShortToast(tv.getText().toString());                    }                });            }        }        return list;    }}

怎么动态创建shape+动态生成selector？

创建shape用到的类是：GradientDrawable,生成Drawble用到的类是：StateListDrawable

public class DrawableUtil {    /**     * 动态创建shape     *      * @param rgb     * @param radius     * @return     */    public static GradientDrawable getDrawable(int rgb, float radius) {        GradientDrawable drawable = new GradientDrawable();        drawable.setShape(GradientDrawable.RECTANGLE);// 矩形        drawable.setCornerRadius(radius);// 4个角的角度        drawable.setColor(rgb);// 设置填充图片的颜色        return drawable;    }    /**     * 动态生成selector     * @param pressed     * @param normal     * @return     */    public static StateListDrawable getSelector(Drawable pressed, Drawable normal) {        StateListDrawable drawable = new StateListDrawable();        drawable.addState(new int[] { android.R.attr.state_pressed }, pressed);//按下对应的drawable        drawable.addState(new int[] {}, normal);//默认的drawable        return drawable;    }}

GradientDrawable normal = DrawableUtil.getDrawable(ColorUtil.getRandomColor(), hot_text_radius);GradientDrawable pressed = DrawableUtil.getDrawable(ColorUtil.getRandomColor(), hot_text_radius);tv.setBackgroundDrawable(DrawableUtil.getSelector(pressed, normal));

源码：

https://git.oschina.net/googlepalycqc/GooglePlayCQCDay04