Helper.java 文件源码

public static String getContactName(Context ctx, String phoneNumber) {
    final ContentResolver cr = ctx.getContentResolver();
    final Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI,
            Uri.encode(phoneNumber));
    Cursor cursor = null;
    String contactName = phoneNumber;
    try {
        cursor = cr.query(uri, new String[] { PhoneLookup.DISPLAY_NAME },
                null, null, null);
        if (cursor == null) {
            return null;
        }

        if (cursor.moveToFirst()) {
            contactName = cursor.getString(cursor
                    .getColumnIndex(PhoneLookup.DISPLAY_NAME));
        }
    } finally {
        if (cursor != null && !cursor.isClosed()) {
            cursor.close();
        }
    }
    return contactName;
}