怎样获取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,能够查询出数据:
採用一个AsyncQueryHandler来进行查询, AsyncQueryHandler自己开启了线程来进行数据查询,非常方便
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); } @Override public 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; } @Override public 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); } } @Override public 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>