android系统联系人分组特效实现(2)---字母表快速滚动
要实现这种功能,只需要在 android系统联系人分组特效实现(1)---分组导航和挤压动画 的基础上再加上一个自定义控件即可完成.
1.新建项目,继续新建一个java类,BladeView,用于作为导航栏
public class BladeView extends View {
private Handler handler = new Handler();
public BladeView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a=getContext().obtainStyledAttributes(attrs,R.styleable.NewMyElement);
textSize=a.getDimension(R.styleable.NewMyElement_textSize, 15);
a.recycle();
}
private PopupWindow mPopupWindow;
private TextView mPopupText;
float textSize;
public interface OnMyImteClickListener{
void onItemClick(int s);
}
private OnMyImteClickListener mListener;
public void setOnMyItemClickListener(OnMyImteClickListener listener){
this.mListener=listener;
}
String b[]={ "#", "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" };
int choose=-1;
Paint paint=new Paint();
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int height=getHeight();
int width=getWidth();
int singleHeight=height/b.length;
for (int i = 0; i < b.length; i++) {
paint.setTextSize(textSize);
paint.setColor(Color.BLACK);
if(i==choose){
paint.setColor(Color.BLUE);
}
float xPos=width/2-paint.measureText(b[i])/2;
float yPos=singleHeight*i+singleHeight;
canvas.drawText(b[i], xPos, yPos, paint);
paint.reset();
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
float y=event.getY();
int oldChoose=choose;
int c=(int)(y/getHeight()*b.length);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if(oldChoose!=c){
if(c>=0&&c<b.length){
choose=c;
mListener.onItemClick(c);
showPopup(c);
invalidate();
}
}
break;
case MotionEvent.ACTION_MOVE:
if(oldChoose!=c){
if(c>=0&&c<b.length){
choose=c;
mListener.onItemClick(c);
showPopup(c);
invalidate();
}
}
break;
case MotionEvent.ACTION_UP:
choose=-1;
mListener.onItemClick(-1);
dismissPopup();
invalidate();
break;
default:
break;
}
return true;
}
private void showPopup(int item) {
if (mPopupWindow == null) {
handler.removeCallbacks(dismissRunnable);
mPopupText = new TextView(getContext());
mPopupText.setBackgroundColor(Color.GRAY);
mPopupText.setTextColor(Color.CYAN);
mPopupText.setTextSize(50);
mPopupText.setGravity(Gravity.CENTER_HORIZONTAL
| Gravity.CENTER_VERTICAL);
mPopupWindow = new PopupWindow(mPopupText, 100, 100);
}
String text = "";
if (item == 0) {
text = "#";
} else {
text = Character.toString((char) ('A' + item - 1));
}
mPopupText.setText(text);
if (mPopupWindow.isShowing()) {
mPopupWindow.update();
} else {
mPopupWindow.showAtLocation(getRootView(),
Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL, 0, 0);
}
}
private void dismissPopup() {
handler.postDelayed(dismissRunnable, 800);
}
Runnable dismissRunnable = new Runnable() {
@Override
public void run() {
if (mPopupWindow != null) {
mPopupWindow.dismiss();
}
}
};
}
2.打开activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:my="http://schemas.android.com/apk/res/com.example.mycontact"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.mycontact.MainActivity" >
<ListView
android:id="@+id/lv_contact"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:scrollbars="none"
android:fadingEdge="none"
></ListView>
<LinearLayout
android:id="@+id/title_layout"
android:layout_width="fill_parent"
android:layout_height="18dp"
android:layout_alignParentTop="true"
android:orientation="vertical"
android:background="#303030"
>
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginLeft="10dp"
android:textColor="#ffffff"
android:textSize="13sp"
/>
</LinearLayout>
<com.example.mycontact.BladeView
android:id="@+id/BladeView"
android:layout_width="30dp"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
my:textSize="23sp"
/>
<RelativeLayout
android:id="@+id/section_toast_layout"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_centerInParent="true"
android:background="@drawable/section_toast"
android:visibility="gone"
>
<TextView
android:id="@+id/section_toast_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="#ffffff"
android:textSize="30sp"
/>
</RelativeLayout>
</RelativeLayout> 3.实现主要功能之前,还需一个实体类
public class Contact {
private String name;//姓名
private String sortKey;//排序字母
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSortKey() {
return sortKey;
}
public void setSortKey(String sortKey) {
this.sortKey = sortKey;
}
}
4.还需要一个ListView展示所显示的子布局
<?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" >
<LinearLayout
android:id="@+id/sort_key_layout"
android:layout_width="fill_parent"
android:layout_height="18dp"
android:orientation="vertical"
android:background="#303030"
>
<TextView
android:id="@+id/sort_key"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginLeft="10dp"
android:textColor="#ffffff"
android:textSize="13sp"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="50dp"
android:orientation="horizontal"
android:id="@+id/name_layout"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:src="@drawable/icon"
/>
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textColor="#ffffff"
android:textSize="22sp"
/>
</LinearLayout>
</LinearLayout>
5.展示数据的适配器
public class ContactAdapter extends ArrayAdapter<Contact> {
//需要渲染的item布局文件
private int resource;
//字母表分组工具
private SectionIndexer mIndexer;
public ContactAdapter(Context context,
int textViewResourceId, List<Contact> objects) {
super(context, textViewResourceId, objects);
resource=textViewResourceId;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Contact contact=getItem(position);
LinearLayout layout=null;
if(convertView==null){
layout=(LinearLayout) LayoutInflater.from(getContext()).inflate(resource, null);
}
else{
layout=(LinearLayout) convertView;
}
TextView name=(TextView) layout.findViewById(R.id.name);
LinearLayout sortKeyLayout=(LinearLayout) layout.findViewById(R.id.sort_key_layout);
TextView sort_key=(TextView) layout.findViewById(R.id.sort_key);
name.setText(contact.getName());
int section=mIndexer.getSectionForPosition(position);
if(position==mIndexer.getPositionForSection(section)){
sortKeyLayout.setVisibility(View.VISIBLE);
sort_key.setText(contact.getSortKey());
}
else{
sortKeyLayout.setVisibility(View.GONE);
}
return layout;
}
//给当前适配器传入一个分组工具
public void setIndexer(SectionIndexer indexer){
mIndexer=indexer;
}
}
6.最关键的MainActivity.java
public class MainActivity extends ActionBarActivity {
//分组的布局
private LinearLayout titleLayout;
//弹出式分组的布局
private RelativeLayout sectionToastLayout;
//右侧可滑动字母表
private BladeView bView;
//分组上显示的字母
private TextView title;
//弹出式分组上的文字
private TextView sectionToastText;
//联系人ListView
private ListView contactListView;
//联系人列表适配器
private ContactAdapter adapter;
//用于对字母表进行分组
private AlphabetIndexer indexer;
//存储手机中所有联系人
private List<Contact> contactsList=new ArrayList<Contact>();
//定义字母表的排序规则
private String alphabet="#ABCDEFGHIJKLMNOPQRSTUVWXYZ";
//记录上一个元素,用于滚动时记录标志
private int lastFirstVisibleItem=-1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adapter=new ContactAdapter(this, R.layout.item,contactsList);
titleLayout=(LinearLayout) findViewById(R.id.title_layout);
title=(TextView) findViewById(R.id.title);
sectionToastLayout=(RelativeLayout) findViewById(R.id.section_toast_layout);
sectionToastText=(TextView) findViewById(R.id.section_toast_text);
bView=(BladeView) findViewById(R.id.BladeView);
contactListView=(ListView) findViewById(R.id.lv_contact);
Uri uri=ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
Cursor cursor=getContentResolver().query(uri, new String[]{"display_name","sort_key"}, null, null, "sort_key");
if(cursor.moveToFirst()){
do {
String name=cursor.getString(0);
String sortKey=getSortKey(cursor.getString(1));
Contact contact=new Contact();
contact.setName(name);
contact.setSortKey(sortKey);
contactsList.add(contact);
} while (cursor.moveToNext());
}
startManagingCursor(cursor);
indexer=new AlphabetIndexer(cursor, 1, alphabet);
adapter.setIndexer(indexer);
if(contactsList.size()>0){
setupContactListView();
setAlphabetListener();
}
}
//为联系人ListView设置滑动监听
private void setupContactListView(){
contactListView.setAdapter(adapter);
contactListView.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView arg0, int arg1) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
int section=indexer.getSectionForPosition(firstVisibleItem);
int nextSectionPosition=indexer.getPositionForSection(section+1);
if(firstVisibleItem!=lastFirstVisibleItem){
MarginLayoutParams params=(MarginLayoutParams) titleLayout.getLayoutParams();
params.topMargin=0;
titleLayout.setLayoutParams(params);
title.setText(String.valueOf(alphabet.charAt(section)));
}
if(nextSectionPosition==firstVisibleItem+1){
View childView=view.getChildAt(0);
if(childView!=null){
int titleHeight=titleLayout.getHeight();
int bottom=childView.getBottom();
MarginLayoutParams params=(MarginLayoutParams) titleLayout.getLayoutParams();
if(bottom<titleHeight){
float pushedDistance=bottom-titleHeight;
params.topMargin=(int)pushedDistance;
titleLayout.setLayoutParams(params);
}
else{
if(params.topMargin!=0){
params.topMargin=0;
titleLayout.setLayoutParams(params);
}
}
}
}
lastFirstVisibleItem=firstVisibleItem;
}
});
}
//设置字母表上的触摸事件
private void setAlphabetListener(){
bView.setOnMyItemClickListener(new OnMyImteClickListener() {
@Override
public void onItemClick(int s) {
if(s!=-1){
contactListView.setSelection(indexer.getPositionForSection(s));
}
}
});
}
//获取sort_key的首字母
private String getSortKey(String sortKeyString){
String key=sortKeyString.substring(0, 1).toUpperCase();
if(key.matches("[A-Z]")){
return key;
}
return "#";
}
}
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