几乎在每个手机上的联系人列表都可以看到右边有个字母列表视图，这里可以通过自定义View实现，在界面右边部分绘制A~Z这些字母，并提供触摸监听器，这里结合上一篇文章将字母列表视图运用在其中，里面用得MyListAdapter、MyViewPager、PinYinUtil都和前面两篇文章一样。代码如下：
MainActivity：
package com.home;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import com.home.AlphabetScrollBar.OnTouchBarListener;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnTouchBarListener {
private ListView listView;
private List<String> list = new ArrayList<String>();// 数据集合
private AlphabetScrollBar asb;// 字母列视图View
private TextView noticeView;// 提示选中的组件
private EditText searchText;// 搜索框
private MyListAdapter adapter;// 适配器
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getContacts();
setContentView(R.layout.activity_main);
asb = (AlphabetScrollBar) findViewById(R.id.main_asb);
asb.setOnTouchBarListener(this);
noticeView = (TextView) findViewById(R.id.main_notice_tv);
asb.setTextView(noticeView);
// 根据拼音对联系人进行排序
Collections.sort(list, new ComparatorPY());
listView = (ListView) findViewById(R.id.main_lv);
adapter = new MyListAdapter(this, list);
listView.setAdapter(adapter);
searchText = (EditText) findViewById(R.id.main_et);
searchText.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
if (!"".equals(cs.toString().trim())) {
filter(cs.toString().trim());// 根据编辑框值过滤联系人并更新联系人列表
asb.setVisibility(View.GONE);
} else {
asb.setVisibility(View.VISIBLE);
adapter.updateListView(list);
}
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
@Override
public void afterTextChanged(Editable arg0) {
}
});
}
@Override
public void onTouch(String letter) {
// 触摸字母列时,将联系人列表更新到首字母出现的位置
for (int i = 0; i < list.size(); i++) {
if (PinYinUtil.getFirstLetter(list.get(i), true).compareToIgnoreCase(letter) == 0) {
listView.setSelection(i);
break;
}
}
}
public class ComparatorPY implements Comparator<String> {
@Override
public int compare(String name1, String name2) {
String pinyin1 = PinYinUtil.getPinYin(name1);
String pinyin2 = PinYinUtil.getPinYin(name2);
return pinyin1.compareToIgnoreCase(pinyin2);
}
}
/**
* 获取系统联系人姓名（为测试方便这里只获取姓名）
*/
public void getContacts() {
ContentResolver resolver = getContentResolver();
Cursor cursor = resolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
while (cursor.moveToNext()) {
String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
list.add(name);
}
if (cursor != null) {
cursor.close();
}
}
/**
* 过滤联系人并刷新列表
*
* @param filterStr
*/
private void filter(String filterStr) {
ArrayList<String> filterList = new ArrayList<String>();
for (int i = 0; i < list.size(); i++) {
// 按拼音首字母进行匹配过滤
if (isContained(PinYinUtil.getFirstSpell(list.get(i)), filterStr)) {
filterList.add(list.get(i));
}
}
// 如果没有匹配的联系人
if (filterList.size() == 0) {
Toast.makeText(this, "没有匹配的联系人", Toast.LENGTH_SHORT).show();
}
adapter.updateListView(filterList); // 更新联系人列表
}
/**
* 判断bigStr是否包含smallStr
*
* @param bigStr
* @param smallStr
* @return
*/
public boolean isContained(String bigStr, String smallStr) {
if (bigStr.toUpperCase().indexOf(smallStr.toUpperCase()) > -1) {
return true;
} else {
return false;
}
}
}
AlphabetScrollBar：
package com.home;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;
public class AlphabetScrollBar extends View {
private Paint paint = new Paint();
private String[] alphabet = 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 boolean pressed;// 是否按下
private int curIndex = -1;
private int oldIndex = -1;
private OnTouchBarListener touchListener;
private TextView noticeView;
public AlphabetScrollBar(Context context, AttributeSet attrs, int arg2) {
super(context, attrs, arg2);
}
public AlphabetScrollBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
public AlphabetScrollBar(Context context) {
super(context);
}
public void setTextView(TextView noticeView) {
this.noticeView = noticeView;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int width = this.getWidth();
int height = this.getHeight();
// 每个字母的高度
int singleLetterH = height / alphabet.length;
if (pressed) {
// 如果处于按下状态，改变背景及相应字体的颜色
canvas.drawColor(Color.parseColor("#40000000"));
}
for (int i = 0; i < alphabet.length; i++) {
paint.setColor(Color.parseColor("#000000"));
paint.setAntiAlias(true);
paint.setTextSize(23);
float x = width / 2 - paint.measureText(alphabet[i]) / 2;
float y = singleLetterH * i + singleLetterH;
if (i == curIndex) {
paint.setColor(Color.parseColor("#0000FF"));
paint.setFakeBoldText(true);
}
canvas.drawText(alphabet[i], x, y, paint);
paint.reset();
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
pressed = true;
handleTouchEvent(event);
return true;
case MotionEvent.ACTION_UP:
if (noticeView != null) {
noticeView.setVisibility(View.INVISIBLE);
}
pressed = false;
curIndex = -1;
this.invalidate();
return true;
case MotionEvent.ACTION_MOVE:
handleTouchEvent(event);
return true;
default:
return super.onTouchEvent(event);
}
}
/**
* 监听器回调接口
*/
public static interface OnTouchBarListener {
void onTouch(String letter);
}
/**
* 设置监听的方法，供外部调用
*/
public void setOnTouchBarListener(OnTouchBarListener listener) {
touchListener = listener;
}
/**
* 处理触摸事件
*
* @param event
*/
private void handleTouchEvent(MotionEvent event) {
curIndex = (int) (event.getY() / this.getHeight() * alphabet.length);
if (touchListener != null && curIndex != oldIndex) {
if ((curIndex >= 0) && (curIndex < alphabet.length)) {
touchListener.onTouch(alphabet[curIndex]);
this.invalidate();
}
oldIndex = curIndex;
}
if (curIndex >= 0 && curIndex < alphabet.length) {
noticeView.setText(alphabet[curIndex]);
noticeView.setVisibility(View.VISIBLE);
}
}
}
activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:id="@+id/main_et"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="搜索联系人"
android:textSize="15dp" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@+id/main_lv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:dividerHeight="1dp" />
<TextView
android:id="@+id/main_notice_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:textSize="50sp"
android:visibility="gone" />
<com.home.AlphabetScrollBar
android:id="@+id/main_asb"
android:layout_width="30dp"
android:layout_height="match_parent"
android:layout_gravity="right" />
</FrameLayout>
</LinearLayout>
在activity属性里面加入下面一句，可以禁止一运行就启动输入法：
android:windowSoftInputMode="stateHidden|adjustPan"
原文：http://blog.csdn.net/u010142437/article/details/22314585