Android手机字母A-Z排序侧边索引是非常常见的功能,在此提供快速集成框架.教你用Android studio工具一分钟搞定这个效果.

实现效果:

以及点击F跳转效果

第一步库包导入实现拼音检索功能

-------拼音检索详细见:

compile 'com.github.promeg:tinypinyin:1.0.0'// ~80KB同步后后面会下载80k的文件,就可以使用

-------测试一下:

public void go1(View view){//按钮go1点击测试

String str="界面侧边ABc字母检索";

for (char c:str.toCharArray()){

System.out.println("检索返回:"+Pinyin.toPinyin(c));//如果c为汉字，则返回大写拼音；如果c不是汉字，则返回String.valueOf(c)

System.out.println("如果c为汉字,则返回true,否则返回false:"+Pinyin.isChinese(c));

}

}

结果效果:

第二步构建代码:

1.适配器LvRithtItemAdapter类

public class LvRightItemAdapter extends BaseAdapter { private List mEntities; private Activity context; private LayoutInflater layoutInflater; public LvRightItemAdapter(Activity context,List entities) { this.context = context; this.mEntities = entities; this.layoutInflater = LayoutInflater.from(context); } @Override public int getCount() { return mEntities.size(); } @Override public DataEntity getItem(int position) { return mEntities.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = layoutInflater.inflate(R.layout.lv_right_item, parent,false); ViewHolder viewHolder = new ViewHolder(); viewHolder.tvLvRightItem = (TextView) convertView.findViewById(R.id.tv_lv_right_item); convertView.setTag(viewHolder); } initializeViews((DataEntity)getItem(position), (ViewHolder) convertView.getTag()); return convertView; } private void initializeViews(DataEntity entity, ViewHolder holder) { //TODO implement holder.tvLvRightItem.setText(String.valueOf(entity.getChar_First())); } protected class ViewHolder { private TextView tvLvRightItem; } }

2.自定义MyExpandAdapter代码(这个类只是把没用到的ExpandableListAdapter复写方法存放在这):

public abstract class MyExpandAdapter implements ExpandableListAdapter{ //用抽象方法把下拉子菜单的不用的方法集中在这里,方便观看 //抽象出接口,回调方法,用方法继承就可以定义子菜单 @Override public void registerDataSetObserver(DataSetObserver observer) { } @Override public void unregisterDataSetObserver(DataSetObserver observer) { } @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 boolean isChildSelectable(int groupPosition, int childPosition) { return false; } @Override public boolean areAllItemsEnabled() { return false; } @Override public boolean isEmpty() { return false; } @Override public void onGroupExpanded(int groupPosition) { } @Override public void onGroupCollapsed(int groupPosition) { } @Override public long getCombinedChildId(long groupId, long childId) { return 0; } @Override public long getCombinedGroupId(long groupId) { return 0; } }

3.精简的下拉子菜单自定义SimpleExpAdapter适配器类

public class SimpleExpAdapter extends MyExpandAdapter{

private List mDataEntities; //列表数据存放的集合

private Activity mActivity;

private LayoutInflater mLayoutInflater; //布局渲染成一个view

public SimpleExpAdapter(List dataEntities, Activity activity){

mDataEntities = dataEntities;

mActivity = activity;

mLayoutInflater=mActivity.getLayoutInflater();

}

@Override

public int getGroupCount() {

return mDataEntities.size();

}

@Override

public int getChildrenCount(int groupPosition) {

return mDataEntities.get(groupPosition).getDatas().size();

}

@Override

public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

ViewHolder viewHolder=null;

if (convertView==null){

viewHolder=new ViewHolder();

convertView=mLayoutInflater.inflate(R.layout.exlv_item_group,parent,false);

viewHolder.mTextView= (TextView) convertView.findViewById(R.id.tv_exlv_group);

convertView.setTag(viewHolder);

}else {

viewHolder= (ViewHolder) convertView.getTag();

}

viewHolder.mTextView.setText(String.valueOf(mDataEntities.get(groupPosition).getChar_First()));//适配器设置列表数据

return convertView;

}

@Override

public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

ViewHolder viewHolder=null;

if (convertView==null){

viewHolder=new ViewHolder();

convertView=mLayoutInflater.inflate(R.layout.exlv_item_child,parent,false);

viewHolder.mTextView= (TextView) convertView.findViewById(R.id.tv_exlv_child);

convertView.setTag(viewHolder);

}else{

viewHolder= (ViewHolder) convertView.getTag();

}

viewHolder.mTextView.setText(mDataEntities.get(groupPosition).getDatas().get(childPosition));

return convertView;

}

class ViewHolder{//item放置的控件

TextView mTextView;

}

}

4.数据逻辑控制dao包:

public class DataDao { private List mDataEntities=new ArrayList<>(); public void add(String data){ char data_first=data.toUpperCase().charAt(0); //将首个字母转换为大写字母 if (Pinyin.isChinese(data_first)){ //如果首个字母是中文,则获取汉字首个字母的大写 data_first= Pinyin.toPinyin(data_first).charAt(0); } //确保取得大写的唯一首字母,然后继续执行 for (DataEntity dataEntity:mDataEntities){ if (dataEntity.isSameFirst(data_first)){ dataEntity.addData(data); return; } } DataEntity dataEntity=new DataEntity(); dataEntity.setChar_First(data_first); dataEntity.addData(data); mDataEntities.add(dataEntity); Collections.sort(mDataEntities); } public List getDataEntities() { System.out.println(mDataEntities.toString()); return mDataEntities; } }

5.封装列表数据类:

public class DataEntity implements Comparable{

private char mChar_First; //定义首字母

private List mDatas=new ArrayList<>();

public boolean isSameFirst(char des){//判断是否与传入的des相等

return des==this.mChar_First;

}

public void addData(String data){

mDatas.add(data);

Collections.sort(mDatas); //排列首字母相同的列表数据

System.out.println(mDatas.toString());

}

@Override

public int compareTo(DataEntity another) {

return this.mChar_First-another.getChar_First();

}

public List getDatas() { //存放同首字母的列表数据

return mDatas;

}

public char getChar_First() {

return mChar_First;

}

public void setChar_First(char char_First) {

mChar_First = char_First;

}

@Override

public String toString() {

return "DataEntity{" +

"mChar_First=" + mChar_First +

", mDatas=" + mDatas +

'}';

}

}

6显示的activity界面类(数据直接在addlistdatas()方法中添加):

public class MainActivity extends AppCompatActivity {

ExpandableListView mExlv;

DataDao mDataDao=new DataDao();

ListView mLvRight; //右侧的字母栏

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initView();

addListdatas();//填充列表假数据测试,失败经验:数据不能再setadapter之后进行

initListener();

}

public void initListener(){

mExlv.setAdapter(new SimpleExpAdapter(mDataDao.getDataEntities(), this));

//全都展开不能回缩

for (int i = 0; i < mDataDao.getDataEntities().size(); i++) {

mExlv.expandGroup(i);

}

mExlv.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

@Override

public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {

return true;

}

});

mLvRight.setAdapter(new LvRightItemAdapter(this,mDataDao.getDataEntities()));

mLvRight.setOnItemClickListener(new AdapterView.OnItemClickListener() {

@Override

public void onItemClick(AdapterView parent, View view, int position, long id) {

mExlv.setSelectedGroup(position);

}

});

}

public void initView(){

mExlv= (ExpandableListView) findViewById(R.id.exlv);

mLvRight= (ListView) findViewById(R.id.lv_right);

}

// public void go1(View view){ //字母检索

// String str="界面侧边ABc字母检索";

// for (char c:str.toCharArray()){

// System.out.println("检索返回:"+Pinyin.toPinyin(c));//如果c为汉字，则返回大写拼音；如果c不是汉字，则返回String.valueOf(c)

// System.out.println("如果c为汉字,则返回true,否则返回false:"+Pinyin.isChinese(c));

// }

// }

public void addListdatas(){

mDataDao.add("拜拜这是b");

mDataDao.add("啊啊这是a");

mDataDao.add("啧啧这是z");

mDataDao.add("烦烦这是f");

mDataDao.add("哥哥这是g");

mDataDao.add("哈哈这是h");

mDataDao.add("看看这是k");

mDataDao.add("啊拜这是ab");

for(int i='a';i

if (i=='e'||i=='h'){

continue;

}

mDataDao.add((char) i + "1");

mDataDao.add((char) i + "2");

mDataDao.add((char) i + "3");

}

for (int i = 'A'; i <= 'Z'; i++) {

if (i == 'E' || i == 'H') {

continue;

}

mDataDao.add((char) i + "1");

mDataDao.add((char) i + "2");

mDataDao.add((char) i + "3");

}

}

第三步xml界面的构建:

1.activity界面的实现:

2.exlv_item_child自定义适配器布局(可以根据自己想法更改界面显示)

3.exlv_item_group自定义适配器布局(可以根据自己想法更改界面显示)

4.lv_right_item自定义listview适配器布局(可以根据自己想法更改界面显示)

最后原理总结:

-----原理解析

概括:字符串放入 集合 中进行排序

分层结构:

A: a开头名字数据 子菜单名字(字符串排序:Collections.sort(数据));

所有数据(如电话名字) B:b开头名字数据 子菜单名字(字符串排序:Collections.sort(数据));

C: c开头数据数据 子菜单名字(字符串排序:Collections.sort(数据));

.....

在ASll码表中字母大小写位置

-----------implement方法构建精简的下拉子菜单适配器.

注意:用抽象类的方法,让我们想要的适配器实现需要的复写的方法

--------列表数据形式: