ContentProvider的使用

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获取手机中音乐列表

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/**
 * 用于从数据库中查询歌曲的信息，保存在List当中
 */
public static List<Mp3Infos> getMp3Infos(Context context) {
    Cursor cursor = context.getContentResolver().query(
            MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,
            MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
    List<Mp3Infos> mp3Infos = new ArrayList<Mp3Infos>();
    for (int i = 0; i < cursor.getCount(); i++) {
        Mp3Infos mp3Info = new Mp3Infos();
        cursor.moveToNext();
        long id = cursor.getLong(cursor
                .getColumnIndex(MediaStore.Audio.Media._ID)); // 音乐id
        String title = cursor.getString((cursor
                .getColumnIndex(MediaStore.Audio.Media.TITLE)));// 音乐标题
        String artist = cursor.getString(cursor
                .getColumnIndex(MediaStore.Audio.Media.ARTIST));// 艺术家
        long duration = cursor.getLong(cursor
                .getColumnIndex(MediaStore.Audio.Media.DURATION));// 时长
        long size = cursor.getLong(cursor
                .getColumnIndex(MediaStore.Audio.Media.SIZE)); // 文件大小
        String url = cursor.getString(cursor
                .getColumnIndex(MediaStore.Audio.Media.DATA)); // 文件路径
        int isMusic = cursor.getInt(cursor
                .getColumnIndex(MediaStore.Audio.Media.IS_MUSIC));// 是否为音乐
        if (isMusic != 0) { // 只把音乐添加到集合当中
            mp3Info.setId(id);
            mp3Info.setTitle(title);
            mp3Info.setArtist(artist);
            mp3Info.setDuration(duration);
            mp3Info.setSize(size);
            mp3Info.setPath(url);
            mp3Infos.add(mp3Info);
        }
    }
    return mp3Infos;
}

其中Mp3Infos如下：

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public class Mp3Infos {
    private long id; // 音乐id
    private String title;// 音乐标题
    private String artist;// 艺术家
    private long duration;// 时长
    private long size;// 文件大小
    private String path;// 文件路径
    // 省略setter和getter方法...
}

获取系统联系人

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public class ContactUtils {
    private static final String[] PHONE_PROJECTION = new String[] {
            Phone.DISPLAY_NAME, Phone.NUMBER, Phone.PHOTO_ID, Phone.CONTACT_ID };
    private Context context;
    /**
     * 联系人显示名称
     */
    private static final int PHONES_DISPLAYNAME_INDEX = 0;
    /**
     * 电话号码
     */
    private static final int PHONES_NUMBER_INDEX = 1;
    /**
     * 头像ID
     */
    private static final int PHONES_PHOTO_ID_INDEX = 2;
    /**
     * 联系人的ID
     */
    private static final int PHONES_CONTACT_ID_INDEX = 3;
    public ContactUtils(Context context) {
        this.context = context;
    }
    /**
     * 获得手机通讯录联系人
     *
     * @param context
     */
    public List<Contact> getPhoneContact() {
        List<Contact> mContactsList = new ArrayList<Contact>();
        ContentResolver resolver = context.getContentResolver();
        Cursor phoneCursor = resolver.query(Phone.CONTENT_URI,
                PHONE_PROJECTION, null, null, null);
        if (phoneCursor != null) {
            while (phoneCursor.moveToNext()) {
                // 得到手机号码
                String phoneNumber = phoneCursor.getString(PHONES_NUMBER_INDEX);
                // 当手机号码为空时，跳过当前循环
                if (TextUtils.isEmpty(phoneNumber)) {
                    continue;
                }
                //得到联系人名称
                String contactName = phoneCursor
                        .getString(PHONES_DISPLAYNAME_INDEX);
                //得到联系人ID
                Long contactId = phoneCursor.getLong(PHONES_CONTACT_ID_INDEX);
                //获得联系人头像ID
                Long photoId = phoneCursor.getLong(PHONES_PHOTO_ID_INDEX);
                //得到联系人头像Bitmap
                Bitmap contactPhoto = null;
                //如果photoId 大于0，表示联系人有头像，如果没有，给此人设置默认头像
                if (photoId > 0) {
                    Uri uri = ContentUris.withAppendedId(
                            ContactsContract.Contacts.CONTENT_URI, contactId);
                    InputStream is = ContactsContract.Contacts
                            .openContactPhotoInputStream(resolver, uri);
                    contactPhoto = BitmapFactory.decodeStream(is);
                }else {
                    contactPhoto = BitmapFactory.decodeResource(context.getResources(),R.drawable.icon_head);
                }
                Contact contact = new Contact(contactName, phoneNumber, contactPhoto);
                mContactsList.add(contact);
            }
            phoneCursor.close();
        }
        return mContactsList;
    }
}

添加用户权限：

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<uses-permission android:name="android.permission.READ_CONTACTS"/>