如何获取android手机联系人并按字母展示(一）

android提供了本地数据库的查询uri,可以查询出数据:

采用一个AsyncQueryHandler来进行查询, AsyncQueryHandler自己开启了线程来进行数据查询，很方便

protected AsyncQueryHandler mQueryHandler;protected final void queryPersonal() {mQueryHandler.startQuery(QUERY_TOKEN, null, ContactsContract.Contacts.CONTENT_URI, Personal.CONTACTS_SUMMARY_PROJECTION, null, null, getSortOrder(ContactsContract.Contacts.DISPLAY_NAME));}protected static String getSortOrder(String fieldName) {//substr为截取函数，取第一个字母//COLLATE主要用于对字符进行排//COLLATE LOCALIZED 按本地语言进行排序return "CASE WHEN substr(UPPER(" + fieldName + "), 1, 1) BETWEEN 'A' AND 'Z' THEN 1 else 10 END," +fieldName + " COLLATE LOCALIZED ASC";}protected final class MyHandler extends AsyncQueryHandler { /** * Asynchronous query handler constructor. */public MyHandler(Context context) {super(context.getContentResolver());}/** * On query completion. */@Override<strong>protected void onQueryComplete(int token, Object cookie, Cursor cursor) </strong>{ //handler查询完的回调if (cursor == null || cursor.isClosed()) {return;}if (!isFinishing()) {setLoading(false);if (mAdapter != null) {mAdapter.setLoading(false);mAdapter.changeCursor(cursor);} if (cursor.getCount() == 0) {mEmtytext.setVisibility(View.VISIBLE);} else {mEmtytext.setVisibility(View.INVISIBLE);}} else {if (cursor != null && !cursor.isClosed()) {cursor.close();}}}}

这个Layout是:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:rcm="http://schemas.android.com/apk/res/com.ringcentral.android"    android:id="@+id/contact_list_view"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@color/bgColorMain"    android:orientation="vertical">    <ListView        android:id="@android:id/list"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:cacheColorHint="@android:color/transparent"        android:descendantFocusability="afterDescendants"        android:divider="@null"        android:fastScrollEnabled="true"        android:listSelector="@drawable/bg_list_item_selector" />    <RelativeLayout        android:id="@+id/no_contact_indication"        android:layout_width="match_parent"        android:layout_height="match_parent">        <TextView            android:id="@+id/emptyListText"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:singleLine="true"            android:text="No Contacts"            android:textColor="@color/text_no_items"            android:textSize="20sp" />        <ProgressBar            android:id="@+id/loading"            style="@style/RCMProgressBar"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:visibility="gone" />    </RelativeLayout></LinearLayout>

然后是list adapter的写法:

protected static final class SectionedContactListItemCache {public TextView sectionHeader;public TextView nameView;public TextView typeView;public ImageView photoView;public ImageView detailItemIcon;        <span style="white-space:pre"></span>public View nameTypeWrapper;}protected final class ContactsAdapter extends ResourceCursorAdapter  {public ContactsAdapter(Context context) {super(context, R.layout.contacts_list_item_photo,null);}@Overridepublic void changeCursor(Cursor c) {super.changeCursor(c);}protected String getTitle(String displayName) {String title;/** check if the first letter is English letter */Matcher matcher = mPattern.matcher(displayName);if (!matcher.find()) {title = NONE_ENGLISH_LETTER_TITLE;} else {title = displayName.trim().substring(0, 1).toUpperCase(Locale.US);}return title;}protected String getDisplayName(Cursor c) {String displayName =  c.getString(Personal.NAME_COLUMN_INDEX);if(TextUtils.isEmpty(displayName)) {return "";}return displayName;}@Overridepublic void bindView(View view, Context context, Cursor cursor) {final SectionedContactListItemCache cache = (SectionedContactListItemCache) view.getTag();cache.typeView.setVisibility(View.GONE);cache.photoView.setVisibility(View.VISIBLE);String name = cursor.getString(Personal.NAME_COLUMN_INDEX);if (TextUtils.isEmpty(name)) {cache.nameView.setText(R.string.contact_no_name);} else {cache.nameView.setText(name);}}@Overridepublic View newView(Context context, Cursor cursor, ViewGroup parent) {View view = super.newView(context, cursor, parent);final SectionedContactListItemCache cache = new SectionedContactListItemCache();            cache.nameTypeWrapper = view.findViewById(R.id.name_type);cache.sectionHeader = (TextView) view.findViewById(R.id.txtSectionHeader);cache.nameView = (TextView) view.findViewById(R.id.name);cache.typeView = (TextView) view.findViewById(R.id.type);cache.photoView = (ImageView) view.findViewById(R.id.photo);cache.detailItemIcon = (ImageView) view.findViewById(R.id.contacts_detail_item_icon);view.setTag(cache);return view;}}//end of adapter

item adapter的layout:

<?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="wrap_content"    android:orientation="vertical">    <TextView        android:id="@+id/txtSectionHeader"        android:layout_width="match_parent"        android:layout_height="@dimen/list_item_section_height"        android:background="@drawable/bg_contacts_section_header"        android:gravity="center_vertical|left"        android:paddingLeft="@dimen/default_padding_to_side"        android:textColor="@color/contacts_text_separator_text_color"        android:textSize="@dimen/font_size_medium" />    <RelativeLayout        android:id="@+id/contact_item"        android:layout_width="match_parent"        android:layout_height="@dimen/general_list_view_item_height">        <ImageView            android:id="@+id/photo"            android:layout_width="@dimen/favorites_item_picture_width"            android:layout_height="match_parent"            android:layout_alignParentLeft="true"            android:layout_alignWithParentIfMissing="true"            android:paddingTop="6dp"            android:paddingBottom="6dp"            android:layout_marginLeft="@dimen/contact_photo_margin_left_right"            android:scaleType="fitCenter"            />        <!-- this icon may be added in next version, and now it would be hidden -->        <ImageView            android:id="@+id/contacts_detail_item_icon"            android:layout_width="50dip"            android:layout_height="60dip"            android:layout_alignParentRight="true"            android:layout_marginRight="0dip"            android:cropToPadding="true"            android:duplicateParentState="false"            android:paddingBottom="3dip"            android:paddingTop="3dip"            android:scaleType="fitCenter"            android:src="@drawable/ic_list_link"            android:visibility="gone" />        <RelativeLayout            android:id="@+id/name_type"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:layout_alignWithParentIfMissing="true"            android:layout_toLeftOf="@id/contacts_detail_item_icon"            android:layout_marginLeft="@dimen/contact_photo_margin_left_right"            android:layout_toRightOf="@id/photo"            android:background="@drawable/bg_list_item_divider">            <TextView                android:id="@+id/type"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_alignBaseline="@+id/name"                android:layout_alignParentRight="true"                android:layout_marginRight="@dimen/contact_type_margin_left_right"                android:ellipsize="marquee"                android:gravity="center_vertical|right"                android:singleLine="true"                android:textColor="@color/refresh_control_text_color"                android:textSize="@dimen/font_size_small" />            <TextView                android:id="@+id/name"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:layout_centerVertical="true"                android:layout_marginRight="@dimen/contact_name_margin_left_right"                android:layout_toLeftOf="@id/type"                android:ellipsize="marquee"                android:gravity="center_vertical|left"                android:singleLine="true"                android:textColor="@color/text_color_main"                android:textSize="@dimen/font_size_medium" />        </RelativeLayout>    </RelativeLayout></LinearLayout>