实现好友页的字母排序展示
采用的一个汉字转汉语拼音的第三方库
implementation 'com.belerweb:pinyin4j:2.5.1'//转拼音
自定义一个sidebar布局文件来展示拼音
package com.example.newbsh.UI.friends.list; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.TextView; import com.example.newbsh.R; public class SideBar extends androidx.appcompat.widget.AppCompatTextView { private String[] letters = new String[]{"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 Paint textPaint; private Paint bigTextPaint; private Paint scaleTextPaint; private Canvas canvas; private int itemH; private int w; private int h; /** * 普通情况下字体大小 */ float singleTextH; /** * 缩放离原始的宽度 */ private float scaleWidth; /** * 滑动的Y */ private float eventY = 0; /** * 缩放的倍数 */ private int scaleSize = 1; /** * 缩放个数item，即开口大小 */ private int scaleItemCount = 6; private ISideBarSelectCallBack callBack; public SideBar(Context context) { this(context, null); } public SideBar(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SideBar(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(attrs); } private void init(AttributeSet attrs) { if (attrs != null) { TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.SideBar); scaleSize = ta.getInteger(R.styleable.SideBar_scaleSize, 1); scaleItemCount = ta.getInteger(R.styleable.SideBar_scaleItemCount, 6); scaleWidth = ta.getDimensionPixelSize(R.styleable.SideBar_scaleWidth, dp(100)); ta.recycle(); } textPaint = new Paint(Paint.ANTI_ALIAS_FLAG); textPaint.setColor(getCurrentTextColor()); textPaint.setTextSize(getTextSize()); textPaint.setTextAlign(Paint.Align.CENTER); bigTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG); bigTextPaint.setColor(getCurrentTextColor()); bigTextPaint.setTextSize(getTextSize() * (scaleSize + 3)); bigTextPaint.setTextAlign(Paint.Align.CENTER); scaleTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG); scaleTextPaint.setColor(getCurrentTextColor()); scaleTextPaint.setTextSize(getTextSize() * (scaleSize + 1)); scaleTextPaint.setTextAlign(Paint.Align.CENTER); } public void setDataResource(String[] data) { letters = data; invalidate(); } public void setOnStrSelectCallBack(ISideBarSelectCallBack callBack) { this.callBack = callBack; } /** * 设置字体缩放比例 * * @param scale */ public void setScaleSize(int scale) { scaleSize = scale; invalidate(); } /** * 设置缩放字体的个数，即开口大小 * * @param scaleItemCount */ public void setScaleItemCount(int scaleItemCount) { this.scaleItemCount = scaleItemCount; invalidate(); } private int dp(int px) { final float scale = getContext().getResources().getDisplayMetrics().density; return (int) (px * scale + 0.5f); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: if (event.getX() > (w - getPaddingRight() - singleTextH - 10)) { eventY = event.getY(); invalidate(); return true; } else { eventY = 0; invalidate(); break; } case MotionEvent.ACTION_CANCEL: eventY = 0; invalidate(); return true; case MotionEvent.ACTION_UP: if (event.getX() > (w - getPaddingRight() - singleTextH - 10)) { eventY = 0; invalidate(); return true; } else break; } return super.onTouchEvent(event); } @Override protected void onDraw(Canvas canvas) { this.canvas = canvas; DrawView(eventY); } private void DrawView(float y) { int currentSelectIndex = -1; if (y != 0) { for (int i = 0; i < letters.length; i++) { float currentItemY = itemH * i; float nextItemY = itemH * (i + 1); if (y >= currentItemY && y < nextItemY) { currentSelectIndex = i; if (callBack != null) { callBack.onSelectStr(currentSelectIndex, letters[i]); } //画大的字母 Paint.FontMetrics fontMetrics = bigTextPaint.getFontMetrics(); float bigTextSize = fontMetrics.descent - fontMetrics.ascent; canvas.drawText(letters[i], w - getPaddingRight() - scaleWidth - bigTextSize, singleTextH + itemH * i, bigTextPaint); } } } drawLetters(y, currentSelectIndex); } private void drawLetters(float y, int index) { //第一次进来没有缩放情况，默认画原图 if (index == -1) { w = getMeasuredWidth(); h = getMeasuredHeight(); itemH = h / letters.length; Paint.FontMetrics fontMetrics = textPaint.getFontMetrics(); singleTextH = fontMetrics.descent - fontMetrics.ascent; for (int i = 0; i < letters.length; i++) { canvas.drawText(letters[i], w - getPaddingRight(), singleTextH + itemH * i, textPaint); } //触摸的时候画缩放图 } else { //遍历所有字母 for (int i = 0; i < letters.length; i++) { //要画的字母的起始Y坐标 float currentItemToDrawY = singleTextH + itemH * i; float centerItemToDrawY; if (index < i) centerItemToDrawY = singleTextH + itemH * (index + scaleItemCount); else centerItemToDrawY = singleTextH + itemH * (index - scaleItemCount); float delta = 1 - Math.abs((y - currentItemToDrawY) / (centerItemToDrawY - currentItemToDrawY)); float maxRightX = w - getPaddingRight(); //如果大于0，表明在y坐标上方 scaleTextPaint.setTextSize(getTextSize() + getTextSize() * delta); float drawX = maxRightX - scaleWidth * delta; //超出边界直接花在边界上 if (drawX > maxRightX) canvas.drawText(letters[i], maxRightX, singleTextH + itemH * i, textPaint); else canvas.drawText(letters[i], drawX, singleTextH + itemH * i, scaleTextPaint); } } } public interface ISideBarSelectCallBack { void onSelectStr(int index, String selectStr); } }
创建汉字转换位汉语拼音，英文字符不变的一个工具类
package com.example.newbsh.UI.friends.list; import net.sourceforge.pinyin4j.PinyinHelper; import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType; import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat; import net.sourceforge.pinyin4j.format.HanyuPinyinToneType; /** * 汉字转换位汉语拼音，英文字符不变 */ public class Cn2Spell { public static StringBuffer sb = new StringBuffer(); /** * 获取汉字字符串的首字母，英文字符不变 * 例如：阿飞→af */ public static String getPinYinHeadChar(String chines) { sb.setLength(0); char[] chars = chines.toCharArray(); HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat(); defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE); defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE); for (int i = 0; i < chars.length; i++) { if (chars[i] > 128) { try { sb.append(PinyinHelper.toHanyuPinyinStringArray(chars[i], defaultFormat)[0].charAt(0)); } catch (Exception e) { e.printStackTrace(); } } else { sb.append(chars[i]); } } return sb.toString(); } /** * 获取汉字字符串的第一个字母 */ public static String getPinYinFirstLetter(String str) { sb.setLength(0); char c = str.charAt(0); String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(c); if (pinyinArray != null) { sb.append(pinyinArray[0].charAt(0)); } else { sb.append(c); } return sb.toString(); } /** * 获取汉字字符串的汉语拼音，英文字符不变 */ public static String getPinYin(String chines) { sb.setLength(0); char[] nameChar = chines.toCharArray(); HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat(); defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE); defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE); for (int i = 0; i < nameChar.length; i++) { if (nameChar[i] > 128) { try { sb.append(PinyinHelper.toHanyuPinyinStringArray(nameChar[i], defaultFormat)[0]); } catch (Exception e) { e.printStackTrace(); } } else { sb.append(nameChar[i]); } } return sb.toString(); } }
一个排序的adapter，来展示好友列表
package com.example.newbsh.UI.friends.list; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import android.widget.Toast; import com.example.newbsh.R; import java.util.List; public class SortAdapter extends BaseAdapter { private List<User> list = null; private Context mContext; public SortAdapter(Context mContext, List<User> list) { this.mContext = mContext; this.list = list; } public int getCount() { return this.list.size(); } public Object getItem(int position) { return list.get(position); } public long getItemId(int position) { return position; } public View getView(final int position, View view, ViewGroup arg2) { ViewHolder viewHolder; final User user = list.get(position); if (view == null) { viewHolder = new ViewHolder(); view = LayoutInflater.from(mContext).inflate(R.layout.friend_item, null); viewHolder.name = (TextView) view.findViewById(R.id.name); viewHolder.catalog = (TextView) view.findViewById(R.id.catalog); view.setTag(viewHolder); } else { viewHolder = (ViewHolder) view.getTag(); } //根据position获取首字母作为目录catalog String catalog = list.get(position).getFirstLetter(); //如果当前位置等于该分类首字母的Char的位置 ，则认为是第一次出现 if(position == getPositionForSection(catalog)){ viewHolder.catalog.setVisibility(View.VISIBLE); viewHolder.catalog.setText(user.getFirstLetter().toUpperCase()); }else{ viewHolder.catalog.setVisibility(View.GONE); } viewHolder.name.setText(this.list.get(position).getName()); return view; } final static class ViewHolder { TextView catalog; TextView name; } /** * 获取catalog首次出现位置 */ public int getPositionForSection(String catalog) { for (int i = 0; i < getCount(); i++) { String sortStr = list.get(i).getFirstLetter(); if (catalog.equalsIgnoreCase(sortStr)) { return i; } } return -1; } }
FriendFragment的设置，装配好友信息（没有写添加好友，目前是静态数据）
package com.example.newbsh.UI.friends; import androidx.lifecycle.ViewModelProviders; import android.os.Bundle; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.fragment.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ListView; import android.widget.TextView; import com.example.newbsh.MainActivity; import com.example.newbsh.R; import com.example.newbsh.UI.friends.list.SideBar; import com.example.newbsh.UI.friends.list.SortAdapter; import com.example.newbsh.UI.friends.list.User; import java.util.ArrayList; import java.util.Collections; public class FriendFragment extends Fragment { private FriendViewModel mViewModel; private View view; private ListView listView; private SideBar sideBar; private ArrayList<User> list; private String getUsername(){ return MainActivity.getUserName(); } public static FriendFragment newInstance() { return new FriendFragment(); } @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { view=inflater.inflate(R.layout.friend_fragment, container, false); return view; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mViewModel = ViewModelProviders.of(this).get(FriendViewModel.class); // TODO: Use the ViewModel initView(); initData(); } private void initView() { listView = (ListView) view.findViewById(R.id.listView); sideBar = (SideBar) view.findViewById(R.id.side_bar); sideBar.setOnStrSelectCallBack(new SideBar.ISideBarSelectCallBack() { @Override public void onSelectStr(int index, String selectStr) { for (int i = 0; i < list.size(); i++) { if (selectStr.equalsIgnoreCase(list.get(i).getFirstLetter())) { listView.setSelection(i); // 选择到首字母出现的位置 return; } } } }); } private void initData() { list = new ArrayList<>(); list.add(new User("亳州")); // 亳[bó]属于不常见的二级汉字 list.add(new User("大娃")); list.add(new User("二娃")); list.add(new User("三娃")); list.add(new User("四娃")); list.add(new User("五娃")); list.add(new User("六娃")); list.add(new User("七娃")); list.add(new User("喜羊羊")); list.add(new User("美羊羊")); list.add(new User("懒羊羊")); list.add(new User("沸羊羊")); list.add(new User("暖羊羊")); list.add(new User("慢羊羊")); list.add(new User("灰太狼")); list.add(new User("红太狼")); list.add(new User("孙悟空")); list.add(new User("黑猫警长")); list.add(new User("舒克")); list.add(new User("贝塔")); list.add(new User("海尔")); list.add(new User("阿凡提")); list.add(new User("邋遢大王")); list.add(new User("哪吒")); list.add(new User("没头脑")); list.add(new User("不高兴")); list.add(new User("蓝皮鼠")); list.add(new User("大脸猫")); list.add(new User("大头儿子")); list.add(new User("小头爸爸")); list.add(new User("蓝猫")); list.add(new User("淘气")); list.add(new User("叶峰")); list.add(new User("楚天歌")); list.add(new User("江流儿")); list.add(new User("Tom")); list.add(new User("Jerry")); list.add(new User("12345")); list.add(new User("54321")); list.add(new User("_(:з」∠)_")); list.add(new User("……%￥#￥%#")); Collections.sort(list); // 对list进行排序，需要让User实现Comparable接口重写compareTo方法 SortAdapter adapter = new SortAdapter(view.getContext(), list); listView.setAdapter(adapter); } }
最终展示
点击右侧会有大波浪来展示当前的字母排序的好友
