安卓项目SimpleQQ——联系人列表页面设计
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完整项目介绍看这里：安卓项目SimpleQQ概述，可下载源码。
单个联系人布局文件：person_list_item.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <!--放字符的条目--> <TextView android:id="@+id/tv_word" android:layout_width="match_parent" android:layout_height="20dp" android:background="#edecec" android:textColor="#b6b4b4" android:gravity="center_vertical" android:paddingLeft="?android:attr/listPreferredItemPaddingLeft" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="5dp" > <!--联系人头像--> <ImageView android:id="@+id/tv_headImg" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:focusable="false" android:background="@drawable/head_2" android:layout_width="50dp" android:layout_height="match_parent"/> <!--联系人名字--> <TextView android:id="@+id/tv_name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#fff" android:gravity="center_vertical" android:minHeight="?android:attr/listPreferredItemHeightSmall" android:paddingLeft="?android:attr/listPreferredItemPaddingLeft" android:paddingRight="?android:attr/listPreferredItemPaddingRight" android:textAppearance="?android:attr/textAppearanceListItemSmall" /> </LinearLayout></LinearLayout>联系人列表ListView:person_list.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:background="#fff" android:layout_width="match_parent" android:layout_height="match_parent"> <!--联系人列表--> <ListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" android:scrollbars="none" /> <!--右侧字母导航--> <com.example.yangenneng0.myapplication.utils.WordsNavigation android:id="@+id/words" android:layout_width="30dp" android:layout_marginRight="0dp" android:layout_height="match_parent" android:layout_alignParentRight="true" /> <!--点击右侧字母导航后在屏幕中间绘制的字母--> <TextView android:id="@+id/tv" android:layout_width="80dp" android:layout_height="80dp" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:background="@color/colorPrimary" android:gravity="center" android:textColor="#ffffff" android:textSize="40sp" android:visibility="gone" /></RelativeLayout>联系人实体类：Person
package com.example.yangenneng0.myapplication.model;import com.example.yangenneng0.myapplication.utils.PinYinUtils;/** * User: yangenneng * DateTime: 2016/12/13 10:43 * Description:好友实体类 */public class Person { private String name; //姓名 private String pinyin;//拼音 private String headerWord; //拼音首字母 private String username;//用户名 private String password;//密码 public Person(){} public Person(String name){ this.name=name; this.password=""; this.username=""; this.pinyin = PinYinUtils.getPinyin(name); headerWord = pinyin.substring(0, 1); } public Person(String name,String username,String password) { this.username=username; this.password=password; this.name = name; this.pinyin = PinYinUtils.getPinyin(name); headerWord = pinyin.substring(0, 1); } public String getPinyin() { return pinyin; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getHeaderWord() { return headerWord; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; }}联系人数据访问对象：PersonDAO
package com.example.yangenneng0.myapplication.dao;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import com.example.yangenneng0.myapplication.db.DbConnection;import com.example.yangenneng0.myapplication.model.Person;import java.util.ArrayList;/** * User: yangenneng * DateTime: 2016/12/17 15:25 * Description:联系人数据访问对象 */public class PersonDAO { private static ArrayList<Person> personList=null;//保存联系人数据 //获取所有联系人 public static ArrayList<Person> getPersonList(){ if(null==personList){ synchronized ( PersonDAO.class ){ if(null==personList){ personList=new ArrayList<Person>(); } } //把数据库中已有的数据拿出来 DbConnection connection=new DbConnection(); SQLiteDatabase db=connection.getConnection(); Cursor cursor=db.query("tb_person",null,null,null,null,null,null); while ( cursor.moveToNext() ){ int namenum=cursor.getColumnIndex("name"); int usernamenum=cursor.getColumnIndex("username"); int passwordnum=cursor.getColumnIndex("password"); String name=cursor.getString(namenum); String username=cursor.getString(usernamenum); String password=cursor.getString(passwordnum); Person person=new Person(name,username,password); personList.add(person); cursor.moveToNext(); } } return personList; } /** * 根据用户名查找用户真实姓名 * @param username * @return */ public static String findNameByUsername(String username){ if(null==personList){ getPersonList(); } for ( int i = 0; i < personList.size(); i++ ) { Person person=personList.get(i); if(username.equals(person.getUsername())){ return person.getName(); } } return ""; } /** * 查找用户名是否存在 * @param username * @return */ public boolean checkUsername(String username){ if(null==personList){ getPersonList(); } for ( int i = 0; i < personList.size(); i++ ) { Person book=personList.get(i); if(username.equals(book.getUsername())){ return true; } } return false; } /** * 插入联系人 * @param person * @return */ public boolean insert(Person person){ if(checkUsername(person.getUsername())){ //如果用户名存在则直接返回失败 return false; } try { personList.add(person); DbConnection conn=new DbConnection(); SQLiteDatabase db=conn.getConnection(); String sql="insert into tb_person(name,username,password) values('" +person.getName()+"','"+person.getUsername()+"','"+person.getPassword()+"')"; db.execSQL(sql); db.close(); return true; }catch ( Exception e ){ return false; } } public boolean chechLogin(String username,String password){ if(null==personList){ getPersonList(); } for ( int i = 0; i < personList.size(); i++ ) { Person book=personList.get(i); if(username.equals(book.getUsername()) && password.equals(book.getPassword())){ return true; } } return false; }}联系人列表适配器：PersonAdapter
package com.example.yangenneng0.myapplication.adapter;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;import com.example.yangenneng0.myapplication.R;import com.example.yangenneng0.myapplication.model.Person;import com.example.yangenneng0.myapplication.viewUI.ChatMainActivity;import java.util.List;/** * User: yangenneng * DateTime: 2016/12/13 10:41 * Description:联系人ListView列表适配器 */public class PersonAdapter extends BaseAdapter { private Context context;//为了实现跳转而写的 private List<Person> list;//联系人列表 private LayoutInflater inflater; public PersonAdapter(Context context, List<Person> list) { inflater = LayoutInflater.from(context); this.context=context;//为了实现跳转而写的 this.list = list; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder; //ViewHolder是自定义内部内类 if(null==convertView){ holder= new ViewHolder(); convertView=inflater.inflate(R.layout.person_list_item,null); //单个联系人 holder.tv_name= (TextView) convertView.findViewById(R.id.tv_name); //姓名 holder.tv_word= (TextView) convertView.findViewById(R.id.tv_word); //名字字母 convertView.setTag(holder); }else { holder= (ViewHolder) convertView.getTag(); } String word=list.get(position).getHeaderWord();//第一个字母 holder.tv_word.setText(word); holder.tv_name.setText(list.get(position).getName()); //跳转到聊天页面 convertView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(); intent.setClass(context,ChatMainActivity.class); Bundle bundle = new Bundle();//传递过去的用户参数 bundle.putString("name", (list.get(position).getName())); intent.putExtras(bundle); context.startActivity(intent); // //Intent intent=new Intent(); //intent.setClass(context,ChatMainActivity.class); //context.startActivity(intent); ////提示当前点击的是哪个类 //Snackbar.make(v, "position:"+position, Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); //将相同字母开头的合并在一起 if(position==0){ //第一个是一定显示的 holder.tv_word.setVisibility(View.VISIBLE); }else { //后一个与前一个对比,判断首字母是否相同，相同则隐藏 String headword=list.get(position-1).getHeaderWord(); if(word.equals(headword)){ holder.tv_word.setVisibility(View.GONE); }else { holder.tv_word.setVisibility(View.VISIBLE); } } return convertView; } private class ViewHolder { private TextView tv_word; private TextView tv_name; }}联系人主页：MainActivity
package com.example.yangenneng0.myapplication;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.design.widget.NavigationView;import android.support.v4.view.GravityCompat;import android.support.v4.widget.DrawerLayout;import android.support.v7.app.ActionBarDrawerToggle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.AbsListView;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import com.example.yangenneng0.myapplication.adapter.PersonAdapter;import com.example.yangenneng0.myapplication.dao.PersonDAO;import com.example.yangenneng0.myapplication.model.Person;import com.example.yangenneng0.myapplication.utils.*;import com.example.yangenneng0.myapplication.viewUI.QQmoodActivity;import com.example.yangenneng0.myapplication.viewUI.QzoneActivity;import com.example.yangenneng0.myapplication.viewUI.RegistActivity;import com.example.yangenneng0.myapplication.viewUI.SettingsActivity;import com.getbase.floatingactionbutton.FloatingActionButton;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;/** * 功能：软件主界面类 */public class MainActivity extends AppCompatActivity implements WordsNavigation.onWordsChangeListener, NavigationView.OnNavigationItemSelectedListener , AbsListView.OnScrollListener{ //侧拉菜单滑出来的那一部分属于NavigationView private static boolean isExit=false;//判断是否直接退出程序 //---联系人列表属性 private Handler handler; // private List<Person> list; //联系人列表基本信息 private TextView tv; //绘制的字母 private ListView listView; //使用适配器的联系人列表 private WordsNavigation word; //右侧字母导航 //---联系人列表属性 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /*--------------联系人 begin--------------*/ tv = (TextView) findViewById(R.id.tv); word = (WordsNavigation) findViewById(R.id.words); listView = (ListView) findViewById(R.id.list); initData();//初始化联系人数据 initListView();//初始化联系人列表 handler = new Handler();//设置列表点击滑动监听 word.setOnWordsChangeListener(this); /*--------------联系人 end--------------*/ //顶部工具栏 Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); //Android侧滑菜单DrawerLayout DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); //ActionBarDrawerToggle监听Drawer拉出、隐藏 ActionBarDrawerToggle toggle = new ActionBarDrawerToggle( this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); drawer.setDrawerListener(toggle); toggle.syncState(); //设置左侧菜单 NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); navigationView.setNavigationItemSelectedListener(this); //发表说说 FloatingActionButton button= (FloatingActionButton) findViewById(R.id.button_mood); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(); intent.setClass(MainActivity.this, QQmoodActivity.class); MainActivity.this.startActivity(intent); } }); //浏览空间 FloatingActionButton button2= (FloatingActionButton) findViewById(R.id.button_qzone); button2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(); intent.setClass(MainActivity.this, QzoneActivity.class); MainActivity.this.startActivity(intent); } }); //给左侧导航赋值当前登录用户名 //TextView loginName= (TextView) findViewById(R.id.loginname); //loginName.setText(APPglobal.USERNAME); } /** * 取Back键的按下事件 */ @Override public void onBackPressed() { DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); if ( drawer.isDrawerOpen(GravityCompat.START) ) { drawer.closeDrawer(GravityCompat.START); //如果左侧导航打开，单机Back键时关闭左侧导航 } else { super.onBackPressed();//如果左侧导航关闭，，单机Back键时退出程序 } } /** * 用于初始化菜单 (只会在第一次初始化菜单时调用） * @param menu 即将要显示的Menu实例 * @return 返回true则显示该menu, false 则不显示 */ @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } /** * 菜单项被点击时调用，也就是菜单项的监听方法。 * @param item 菜单项点击的子菜单 * @return */ @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if ( id == R.id.action_settings ) { //安全退出 Intent intent = new Intent(); intent.setClass(MainActivity.this, LoginActivity.class); MainActivity.this.startActivity(intent); return true; } if ( id == R.id.action_regist ) { //立即注册 Intent intent = new Intent(); intent.setClass(MainActivity.this, RegistActivity.class); MainActivity.this.startActivity(intent); return true; } return super.onOptionsItemSelected(item); } /** * 左侧导航被选择时触发的事件 * @param item 左侧选中的菜单 * @return */ @SuppressWarnings("StatementWithEmptyBody") @Override public boolean onNavigationItemSelected(MenuItem item) { // Handle navigation view item clicks here. int id = item.getItemId(); if ( id == R.id.nav_camera ) {//拍照 // Handle the camera action Intent intent=new Intent(); intent.setClass(MainActivity.this,CameraActivity.class); MainActivity.this.startActivity(intent); } else if ( id == R.id.nav_gallery ) { //相册 获取指定目录下的所有照片 Intent intent = new Intent(Intent.ACTION_VIEW); String type = "image/*"; Uri uri = Uri.parse("file:///sdcard/QQ_Test/"); intent.setDataAndType(uri, type); startActivity(intent); } else if ( id == R.id.nav_slideshow ) { //视频 调用视频播放器播放指定的视频 Intent intent = new Intent(Intent.ACTION_VIEW); String type = "video/mp4"; Uri uri = Uri.parse("file:///sdcard/QQ_TEST_Video/03简单句的补充.mp4"); intent.setDataAndType(uri, type); startActivity(intent); } else if ( id == R.id.nav_manage ) { //系统设置 Intent intent = new Intent(); intent.setClass(MainActivity.this, SettingsActivity.class); MainActivity.this.startActivity(intent); } else if ( id == R.id.nav_share ) { //分享软件 Intent intent = new Intent(); intent.setClass(MainActivity.this, MessageActivity.class); MainActivity.this.startActivity(intent); } else if ( id == R.id.nav_send ) { //地理位置 Intent intent = new Intent(); intent.setClass(MainActivity.this, MapActivity.class); MainActivity.this.startActivity(intent); } //选择之后关闭左侧导航 DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); drawer.closeDrawer(GravityCompat.START); return true; } /** * 继承 WordsNavigation.onWordsChangeListener 手指按下字母改变监听回调 * @param words 按下的字母 */ @Override public void wordsChange(String words) { updateWord(words); //更新字母 updateListView(words); //更新列表 } /** * 初始化好友列表 */ private void initListView() { PersonAdapter adapter = new PersonAdapter(this, list); listView.setAdapter(adapter); listView.setOnScrollListener(this); } /** * 初始化联系人列表信息 */ private void initData() { list = new ArrayList<>(); //list.add(new Person("Dave")); //list.add(new Person("张晓飞")); //list.add(new Person("杨光福")); //list.add(new Person("阿钟")); //list.add(new Person("胡继群")); //list.add(new Person("徐歌阳")); //list.add(new Person("钟泽兴")); //list.add(new Person("宋浮点")); //list.add(new Person("刘俄式")); //list.add(new Person("Tony")); //list.add(new Person("老刘")); //list.add(new Person("葛优")); //list.add(new Person("安传鑫")); //list.add(new Person("温松")); //list.add(new Person("成龙")); //list.add(new Person("那英")); //list.add(new Person("刘甫")); //list.add(new Person("沙宝亮")); //list.add(new Person("张梁")); //list.add(new Person("张大爷")); //list.add(new Person("张哥")); //list.add(new Person("张娃")); //list.add(new Person("张丽")); //list.add(new Person("吴亮")); //list.add(new Person("Tom")); //list.add(new Person("安在")); //list.add(new Person("小李")); //list.add(new Person("贝阿朵")); //list.add(new Person("赵二喜")); //list.add(new Person("阿道夫")); //list.add(new Person("姜宇航")); list= PersonDAO.getPersonList(); //对集合排序：按字母顺序排序 Collections.sort(list, new Comparator<Person>() { @Override public int compare(Person lhs, Person rhs) { //根据拼音进行排序 return lhs.getPinyin().compareTo(rhs.getPinyin()); } }); } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } /** * * @param view * @param firstVisibleItem * @param visibleItemCount * @param totalItemCount */ @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { //当滑动列表的时候，更新右侧字母列表的选中状态 word.setTouchIndex(list.get(firstVisibleItem).getHeaderWord()); } /** * 根据右侧的选中字母重新排序中间联系人的选中 * 把那个字母的联系人的第一个找到就可以了 设置那个时候的选中状态为那个位置 * @param words 首字母 */ private void updateListView(String words) { for (int i = 0; i < list.size(); i++) { String headerWord = list.get(i).getHeaderWord(); //将手指按下的字母与列表中相同字母开头的项找出来 if (words.equals(headerWord)) { //将列表选中哪一个 listView.setSelection(i); //找到开头的一个即可 return; } } } /** * 更新中央的字母提示 * @param words 首字母 */ private void updateWord(String words) { tv.setText(words); tv.setVisibility(View.VISIBLE); //清空之前的所有消息 handler.removeCallbacksAndMessages(null); //1s后让tv隐藏 handler.postDelayed(new Runnable() { @Override public void run() { tv.setVisibility(View.GONE); } }, 500);//绘制的画面停留0.5s } Handler myhandler=new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); isExit=false; } }; //退出确认 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode==KeyEvent.KEYCODE_BACK){ if(!isExit){ isExit=true; Toast.makeText(getApplicationContext(),"再按一次退出程序",Toast.LENGTH_SHORT).show(); myhandler.sendEmptyMessageDelayed(0,2000); } }else { finish(); System.exit(0); } return super.onKeyDown(keyCode, event); }}获取汉字的拼音：PinYinUtils
package com.example.yangenneng0.myapplication.utils;import net.sourceforge.pinyin4j.PinyinHelper;import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;/** * User: yangenneng * DateTime: 2016/12/13 10:44 * Description:得到指定汉字的拼音 */public class PinYinUtils { public static String getPinyin(String hanzi){ StringBuffer sb=new StringBuffer(); HanyuPinyinOutputFormat format=new HanyuPinyinOutputFormat(); format.setCaseType(HanyuPinyinCaseType.UPPERCASE); format.setToneType(HanyuPinyinToneType.WITHOUT_TONE); //由于不能直接对多个汉子转换，只能对单个汉子转换 char[] arr=hanzi.toCharArray(); for ( int i = 0; i < arr.length; i++ ) { if(Character.isWhitespace(arr[i])){//如果是空格 continue; } try { String[] pinyinArr= PinyinHelper.toHanyuPinyinStringArray(arr[i],format); if(pinyinArr!=null)sb.append(pinyinArr[0]); else sb.append(arr[i]); } catch ( BadHanyuPinyinOutputFormatCombination badHanyuPinyinOutputFormatCombination ) { badHanyuPinyinOutputFormatCombination.printStackTrace(); //不是正确的汉字 sb.append(arr[i]); } } return sb.toString(); }}联系人右侧字母导航：WordsNavigation
package com.example.yangenneng0.myapplication.utils;import android.content.Context;import android.graphics.*;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * User: yangenneng * DateTime: 2016/12/13 11:14 * Description:实现手机联系人列表导航 */public class WordsNavigation extends View { /*绘制的列表导航字母*/ private 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 Paint wordsPaint; //字母画笔 private Paint bgPaint; //字母背景画笔 private int itemWidth; //每一个字母的宽度 private int itemHeight; //每一个字母的高度 private int touchIndex = 0; //手指按下的字母索引 private onWordsChangeListener listener;//自定义类 手指按下的字母改变接口 /** * 初始化画笔 */ private void init(){ //字母画笔 wordsPaint=new Paint(); wordsPaint.setColor(Color.parseColor("#F7F7F7")); wordsPaint.setAntiAlias(true); wordsPaint.setTextSize(40); wordsPaint.setTypeface(Typeface.DEFAULT_BOLD); //字母背景画笔 bgPaint = new Paint(); bgPaint.setAntiAlias(true); bgPaint.setColor(Color.parseColor("#1dcdef")); } /*---------------继承View类自动生成的类 begin------------------*/ public WordsNavigation(Context context) { super(context); init(); } public WordsNavigation(Context context, AttributeSet attrs) { super(context, attrs); init(); } public WordsNavigation(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } /*-----------------继承View类自动生成 end----------------*/ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); itemWidth=getMeasuredWidth(); int height = getMeasuredHeight() - 10; //使得边距好看一些 itemHeight = height / 27; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); for (int i = 0; i < words.length; i++) { if (touchIndex == i) {//判断是不是我们按下的当前字母 //绘制文字圆形背景 canvas.drawCircle(itemWidth / 2, itemHeight / 2 + i * itemHeight, 23, bgPaint); wordsPaint.setColor(Color.WHITE);//当前按下的是白色字体 } else { wordsPaint.setColor(Color.GRAY); //否则为黑色字体 } //获取文字的宽高 Rect rect = new Rect(); wordsPaint.getTextBounds(words[i], 0, 1, rect); int wordWidth = rect.width(); //绘制字母 float wordX = itemWidth / 2 - wordWidth / 2; float wordY = itemWidth / 2 + i * itemHeight; canvas.drawText(words[i], wordX, wordY, wordsPaint); } } /** * 当手指触摸按下的时候改变字母背景颜色 */ @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: float y = event.getY(); //获得我们按下的是那个索引(字母) int index = (int) (y / itemHeight); if (index != touchIndex) touchIndex = index; //防止数组越界 if (listener != null && 0 <= touchIndex && touchIndex <= words.length - 1) { //回调按下的字母 listener.wordsChange(words[touchIndex]); } invalidate(); break; case MotionEvent.ACTION_UP: //手指抬起,不做任何操作 break; } return true; } /** * 设置当前按下的是那个字母 * @param word */ public void setTouchIndex(String word) { for (int i = 0; i < words.length; i++) { if (words[i].equals(word)) { touchIndex = i; invalidate(); return; } } } /** * 手指按下了哪个字母的回调接口 */ public interface onWordsChangeListener { void wordsChange(String words); } /*设置手指按下字母改变监听*/ public void setOnWordsChangeListener(onWordsChangeListener listener) { this.listener = listener; }} 1 0
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