1.实现该功能需要在Eclipse工具的SDK路径下添加 android-5.0,1 android-5.1 android- 5.1.1版本,同时需要引用android-support-v7-appcompat和recycleview库文件。
2.布局文件代码:
android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#000000" android:orientation="vertical" > android:id="@+id/body" android:layout_width="match_parent" android:layout_height="344dp" > android:id="@+id/recycler_view" android:layout_width="match_parent" android:layout_height="344dp" android:layout_gravity="center_vertical" android:layout_marginLeft="8dp" > android:id="@+id/sidrbar" android:layout_width="match_parent" android:layout_height="48dp" android:layout_below="@+id/body" android:layout_gravity="center" android:layout_marginLeft="3dp" android:layout_marginTop="15dp" android:orientation="horizontal" />
3.自定义SideBar代码如下:
public class SideBar extends View{
private static final String TAG = "SideBar";
private static String minue="A";
/**
* 触摸事件
*/
private ITouchingLetterChangedListener onTouchingLetterChangedListener;
/**
* 侧边栏显示字母
*/
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", "#" };
/**
* 是否选中
*/
private int choose = -1;
private int chooseup=-1;
/**
* 相应的画笔
*/
private Paint paint;
/**
* 构造函数 数据初始化
* @param context 上下文对象
* @param attrs 属性列表
* @param defStyleAttr 默认样式
*/
public SideBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
/**
* 初始化相应的数据
*/
private void init() {
paint = new Paint();
}
/**
* 构造函数 数据初始化
* @param context 上下文对象
* @param attrs 属性列表
*/
public SideBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* 构造函数 数据初始化
* @param context 上下文对象
*/
public SideBar(Context context) {
this(context, null);
}
/**
* 绘制列表控件的方法
* 将要绘制的字母以从上到下的顺序绘制在一个指定区域
* 如果是进行选中的字母就进行高亮显示
*/
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
int height = getHeight();// 获取对应高度
int width = getWidth(); // 获取对应宽度
int singleWidth = width / words.length;// 获取每一个字母的宽度
for (int i = 0; i < words.length; i++) {
paint.setColor(getResources().getColor(R.color.indexadc));
// paint.setColor(Color.WHITE);
paint.setTypeface(Typeface.DEFAULT_BOLD);
paint.setTextSize(20f);
// 选中的状态
if (i == choose) {
chooseup=choose;
paint.setColor(getResources().getColor(R.color.indexabc));
paint.setFakeBoldText(true);
}
// x坐标等于中间-字符串宽度的一半.
//float yPos = height / 2.0f - paint.measureText(words[i]) / 2.0f;
float yPos = height / 2.0f - paint.measureText(words[0]) / 2.0f;
float xPos = singleWidth * i + singleWidth/2;
if (words[i]=="I") { //解决当绘制字母I时会左右距离不同问题
xPos = singleWidth * i + singleWidth/2+paint.measureText(words[0]) / 2.0f;
}
canvas.drawText(words[i], xPos, yPos, paint);
paint.reset();// 重置画笔
}
/*if(isup==true){
paint.setColor(getResources().getColor(R.color.indexabc));
paint.setFakeBoldText(true);
paint.setTypeface(Typeface.DEFAULT_BOLD);
paint.setTextSize(20f);
// x坐标等于中间-字符串宽度的一半.
float yPos = height / 2.0f - paint.measureText(words[chooseup]) / 2.0f;
float xPos = singleWidth * chooseup + singleWidth/2;
if (words[chooseup]=="I") { //解决当绘制字母I时会左右距离不同问题
xPos = singleWidth * chooseup + singleWidth/2+paint.measureText(words[0]) / 2.0f;
}
float yPos = height / 2.0f - paint.measureText(words[0]) / 2.0f;
float xPos = singleWidth * chooseup + singleWidth/2;
if (words[chooseup]=="I") { //解决当绘制字母I时会左右距离不同问题
xPos = singleWidth * chooseup + singleWidth/2+paint.measureText(words[0]) / 2.0f;
}
// float yPos = height / 2 - paint.measureText(words[chooseup]) / 2;
// float xPos = singleWidth * chooseup + singleWidth;
canvas.drawText(words[chooseup], xPos, yPos, paint);
paint.reset();// 重置画笔
*/ //}
/*if(isshow==true){
paint.setColor(getResources().getColor(R.color.indexabc));
paint.setFakeBoldText(true);
paint.setTypeface(Typeface.DEFAULT_BOLD);
paint.setTextSize(20f);
// x坐标等于中间-字符串宽度的一半.
float yPos = height / 2 - paint.measureText(minue) / 2;
float xPos = singleWidth * chooseup + singleWidth;
canvas.drawText(minue, xPos, yPos, paint);
paint.reset();// 重置画笔
}*/
}
boolean isup=false;
//boolean isshow=false;
/**
* 处理触摸事件的方法
* 用户按下时候,整个控件背景变化
* 根据按下x坐标 判断究竟用户按下那个字母
* 当前字母高亮显示 将其字母显示屏幕中央
*/
@SuppressWarnings("deprecation")
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
int action = event.getAction();
final float x = event.getX();// 点击x坐标
final int oldChoose = choose;
final ITouchingLetterChangedListener listener = onTouchingLetterChangedListener;
final int c = (int) (x / getWidth() * words.length);// 点击x坐标所占总宽度的比例*b数组的长度就等于点击b中的个数.
switch (action) {
case MotionEvent.ACTION_UP:
isup=true;
FragmentContacts.hideADCtip();
setBackgroundDrawable(new ColorDrawable(0x00000000));
choose = -1;//
invalidate();
break;
default:
isup=false;
//setBackgroundResource(R.drawable.sidebar_background);
if (oldChoose != c) {
if (c >= 0 && c < words.length) {
if (listener != null) {
listener.OnTouchingLetterChanged(words[c]);
}
choose = c;
invalidate();
}
}
break;
}
return true;
}
//listView滑动可见第一个字母
public void setPosition(String position){
Log.i(TAG, "position"+position);
//isshow=true;
minue=position;
}
/**
* 接口
*/
public interface ITouchingLetterChangedListener {
void OnTouchingLetterChanged(String cString);
}
/**
* 字母改变的监听器
* @return 获取字母改变的监听器
*/
public ITouchingLetterChangedListener getOnTouchingLetterChangedListener() {
return onTouchingLetterChangedListener;
}
/**
* 设置改变的监听器
* @param onTouchingLetterChangedListener 设置字母改变的监听器
*/
public void setOnTouchingLetterChangedListener(
ITouchingLetterChangedListener onTouchingLetterChangedListener) {
this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
}
}
4.获取 RecyclerView第一个可见View和最后一个可见的View代码:
mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView,
int newState) {
super.onScrollStateChanged(recyclerView, newState);
RecyclerView.LayoutManager layoutManager = recyclerView
.getLayoutManager();
// 判断是当前layoutManager是否为LinearLayoutManager
// 只有LinearLayoutManager才有查找第一个和最后一个可见view位置的方法
if (layoutManager instanceof LinearLayoutManager) {
LinearLayoutManager linearManager = (LinearLayoutManager) layoutManager;
// 获取最后一个可见view的位置
int lastItemPosition = linearManager
.findLastVisibleItemPosition();
// 获取第一个可见view的位置
int firstItemPosition = linearManager
.findFirstVisibleItemPosition();
String a = mContactsList.get(firstItemPosition)
.getSortLetters();
sideBar.setPosition(a);
}
}
});
5.加载联系人代码和滑动监听索引表事件代码:
/**
* 加载所有联系人(仅限主线程中调用)
*/
private void showAllContacts() {
// 不要在子线程中直接修改mContanctsList里的内容
DataManager.getInstance().getAllContacts(mContactsList);
layoutManager = new LinearLayoutManager(context);
// 设置显示的方向
layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
mRecyclerView.setLayoutManager(layoutManager);
mListAdapter = new ListAdapter(context, mContactsList);
// 设置适配器 mListAdapter ---> List<数据>
mRecyclerView.setAdapter(mListAdapter);
// 更新完后,设置回到第一项
if (mListAdapter.getItemCount() > 0) {
layoutManager.scrollToPosition(0);
}
// 设置字母索引表被触摸时的监听
sideBar.setOnTouchingLetterChangedListener(new ITouchingLetterChangedListener() {
@Override
public void OnTouchingLetterChanged(String selectedChar) {
// 该字母首次出现的位置
int position = mListAdapter.getPositionForSection(selectedChar
.charAt(0));
if (!selectedChar.equals("")) {
index.setVisibility(View.VISIBLE);
}
Log.i("TAG", "position=" + position + ",被点击的字母: selectedChar="
+ selectedChar);
if (position != -1) {
// 跳转到指定的item
layoutManager.scrollToPositionWithOffset(position, 0);
index.setText(selectedChar);
}
}
});
}
6.根据分类的首字母的Char ascii值获取其第一个出现该首字母的位置代码:
@Override
public int getPositionForSection(intsection) {
for(inti = 0; i < getItemCount(); i++) {
String sortStr = mContactsList.get(i).getSortLetters();
charfirstChar = sortStr.toUpperCase().charAt(0)
if(firstChar == section)
retur i;
}
return
7.RecycleView点击监听代码:
view.setOnClickListener (new OnClickListener
@Override
public void onClick(View v) {
if(mContactsList != null&& mContactsList.size()!=0) {
Contacts contacts = mContactsList.get(
getPosition
());
if(contacts != null) {