ExpandableListView 添加边框首字母点击监听代码(索引)

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自定义view

public class AllContactIndexView extends View {    public static final String[] WORDS = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P","Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};    private int preHeight = 18;//每一个字母的高度    private AllcontactExpandableBaseApdpter allcontactExpandableBaseApdpter;    private ExpandableListView expandableListView;    //设置ListView的set方法  这样可以在main调用    public void setMlistView(ExpandableListView expandableListView) {        this.expandableListView = expandableListView;        allcontactExpandableBaseApdpter = (AllcontactExpandableBaseApdpter) expandableListView.getExpandableListAdapter();//获得ListView关联的Adapter    }    private Paint paint;//画笔    private int blankHeight;//空白的高度  字母和字母之间的距离  //TODO 留着计算    public AllContactIndexView(Context context) {        super(context);        init();    }    public AllContactIndexView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    //在该生命周期中,会测量控件的宽高    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec); //getMeasuredHeight()的方法是 获取该组件高度        blankHeight = (getMeasuredHeight() - (WORDS.length * preHeight)) / (WORDS.length - 1);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        for (int i = 0; i < WORDS.length; i++) {            //在该组件上画文字            canvas.drawText(WORDS[i], getMeasuredWidth() / 2, (i + 1) * (preHeight + blankHeight), paint);        }    }    //该方法会处理用户的点击事件    @Override    public boolean onTouchEvent(MotionEvent event) {        //当用户按下的时候        if (event.getAction() == MotionEvent.ACTION_DOWN) {            int index = (int) (event.getY() / (preHeight + blankHeight));            if (index >= WORDS.length) {                //做一个修正                index = WORDS.length - 1;            } else if (index < 0) {                index = 0;            }            //TODO 通过字母获得ListView的条数,并滚动到该位置            int pos = allcontactExpandableBaseApdpter.getIndexFromString(WORDS[index]);            if (pos >= 0) {                expandableListView.setSelection(pos);                Log.i("+++++++",pos+"");            }        }        return super.onTouchEvent(event);    }    private void init() {        paint = new Paint();        //文字颜色        paint.setColor(Color.BLACK);        //文字对齐方式        paint.setTextAlign(Paint.Align.CENTER);        //将高度从dp转换成px        preHeight = dpTopx(preHeight, getContext());        //设置字体大小的时候,需要px为单位  所以需要将获得的dp转化成px        paint.setTextSize(preHeight);        paint.setAntiAlias(true);    }    //将dp转换成px 的方法    private int dpTopx(int dp, Context context) {        int px = 0;        //获得资源文件的数据所用到的 需要通过Resiyrces下得DisplayMetrics的destiyDip        // TODO 自己查下        Resources resources = context.getResources();        //屏幕度量  //获取屏幕度量        // TODO 自己查下        DisplayMetrics displayMetrics = resources.getDisplayMetrics();        //dp * displayMetrics.densityDpi / 160f是        // TODO dp和px的倍数关系    0.5f是为了让px取整        px = (int) (dp * displayMetrics.densityDpi / 160f + 0.5f);        return px;    }

}

2.适配器代码:

public class AllcontactExpandableBaseApdpter extends BaseExpandableListAdapter{    private Context context;    private AllContact allContact;    public AllcontactExpandableBaseApdpter(Context context,AllContact allContact) {        this.context = context;        this.allContact = allContact;    }    @Override    public int getGroupCount() {        return allContact.getGroupCount();    }    @Override    public int getChildrenCount(int groupPosition) {        return allContact.getChildcount(groupPosition);    }    @Override    public Object getGroup(int groupPosition) {        return null;    }    @Override    public Object getChild(int groupPosition, int childPosition) {        return null;    }    @Override    public long getGroupId(int groupPosition) {        return 0;    }    @Override    public long getChildId(int groupPosition, int childPosition) {        return 0;    }    @Override    public boolean hasStableIds() {        return false;    }    @Override    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {        GroupViewHolder groupViewHolder;        if(convertView == null){            convertView = LayoutInflater.from(context).inflate(R.layout.item_expandblelistview_all_group,null);            groupViewHolder = new GroupViewHolder(convertView);            convertView.setTag(groupViewHolder);        }        else{            groupViewHolder = (GroupViewHolder) convertView.getTag();        }        groupViewHolder.letterTv.setText(allContact.getGroupName(groupPosition));        return convertView;    }    @Override    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {        ChildViewHolder childViewHolder;        if(convertView == null){            convertView = LayoutInflater.from(context).inflate(R.layout.item_expandablelistview_all_child,null);            childViewHolder = new ChildViewHolder(convertView);            convertView.setTag(childViewHolder);        }        else{            childViewHolder = (ChildViewHolder) convertView.getTag();        }        ContactPersonContent contactPersonContent = allContact.getChild(groupPosition,childPosition);        childViewHolder.nameTV.setText(contactPersonContent.getName());        childViewHolder.numberTv.setText(contactPersonContent.getNumber());        return convertView;    }    class GroupViewHolder{//父列表缓存类        TextView letterTv;        public GroupViewHolder(View view){            letterTv = (TextView) view.findViewById(R.id.item_all_group_name);        }    }    class ChildViewHolder{//子列表缓存类        TextView nameTV,numberTv;        public ChildViewHolder(View view){            nameTV = (TextView) view.findViewById(R.id.item_child_name);            numberTv = (TextView) view.findViewById(R.id.item_child_number);        }    }    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        return false;    }    //在数据里    public int getIndexFromString(String s){        for (int i = 0; i < allContact.firstLetter.size(); i++) {            if (allContact.firstLetter.get(i).equals(s)){                //找到该字母,立即返回索引                return i;            }        }        return -1;//没有找到字母,返回-1    }

}

主函数代码: (fragment中)

public class AllContactPersonFragment extends Fragment {    private ExpandableListView expandableListView;    private ContentResolver cr;    private AllContact allContact;//数据类    private AllcontactExpandableBaseApdpter allcontactExpandableBaseApdpter;    private DBTool dbTool;//定义数据库工具类    private Context context;    private com.tianhe.homework.allcontact.AllContactIndexView allContactIndexView;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment_contact_person_all,null);        return view;    }    @Override    public void onAttach(Context context) {        super.onAttach(context);        this.context = context;    }    @Override    public void onActivityCreated(@Nullable Bundle savedInstanceState) {        super.onActivityCreated(savedInstanceState);        allContact = new AllContact();        expandableListView = (ExpandableListView) getActivity().findViewById(R.id.all_expandablelistview);        cr = context.getContentResolver();        allcontactExpandableBaseApdpter = new AllcontactExpandableBaseApdpter(getActivity(), initData());        expandableListView.setAdapter(allcontactExpandableBaseApdpter);        allContactIndexView = (AllContactIndexView) getActivity().findViewById(R.id.index_view);        allContactIndexView.setMlistView(expandableListView);        dbTool = new DBTool(context);//初始化数据库    }    private AllContact initData() {        Cursor cursor = getActivity().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);        AllContact allContact = new AllContact();        dbTool = new DBTool(context);//进行初始化        if (cursor != null) {            while (cursor.moveToNext()) {                ContactPersonContent content = new ContactPersonContent();                String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));//添加通讯录姓名                String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DATA)); //添加通讯录电话                content.setName(name);                content.setNumber(number);                allContact.addContact(content);                dbTool.insert(number, name);//将姓名和电话号加入数据库            }        }        cursor.close();        return allContact;    }}

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