android中的接触式图像分辨率

我已经检索了android手机联系人图像，并将其存储在arraylist中，如下所示

id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
String photoWhere = ContactsContract.Data.CONTACT_ID + " = ? AND " +ContactsContract.Data.MIMETYPE + " = ?";
String[] photoParams = new String[] {id,ContactsContract.CommonDataKinds.Photo.CONTENT_ITEM_TYPE};
Cursor photoCursor = contentResolver.query(ContactsContract.Data.CONTENT_URI, null, photoWhere, photoParams, null);                     
if(photoCursor!=null && photoCursor.getCount()>0)
{
 while(photoCursor.moveToNext())
    {
        byte[] contactPhoto = photoCursor.getBlob(photoCursor.getColumnIndex(ContactsContract.CommonDataKinds.Photo.PHOTO));                        
        if(contactPhoto!=null)
        {
            mContactImage="data:image/jpeg;base64," + Base64.encodeToString(contactPhoto, Base64.NO_WRAP);                   
            sContactImageArray.add(mContactImage);
        }                                           
   }
}                                 
photoCursor.close();

---

然后我将这个base64字符串传递到javascript中并显示为图像。但是图像分辨率很差。这与手机通讯录中存储的图像不同。如何检索100%质量的联系人图像？

请参考这些字段。如果联系人头像是从本地照片设置的，那么您可能有机会获得高分辨率版本

    /**
     * Reference to the row in the data table holding the photo.  A photo can
     * be referred to either by ID (this field) or by URI (see {@link #PHOTO_THUMBNAIL_URI}
     * and {@link #PHOTO_URI}).
     * If PHOTO_ID is null, consult {@link #PHOTO_URI} or {@link #PHOTO_THUMBNAIL_URI},
     * which is a more generic mechanism for referencing the contact photo, especially for
     * contacts returned by non-local directories (see {@link Directory}).
     *
     * <P>Type: INTEGER REFERENCES data(_id)</P>
     */
    public static final String PHOTO_ID = "photo_id";

    /**
     * Photo file ID of the full-size photo.  If present, this will be used to populate
     * {@link #PHOTO_URI}.  The ID can also be used with
     * {@link ContactsContract.DisplayPhoto#CONTENT_URI} to create a URI to the photo.
     * If this is present, {@link #PHOTO_ID} is also guaranteed to be populated.
     *
     * <P>Type: INTEGER</P>
     */
    public static final String PHOTO_FILE_ID = "photo_file_id";

    /**
     * A URI that can be used to retrieve the contact's full-size photo.
     * If PHOTO_FILE_ID is not null, this will be populated with a URI based off
     * {@link ContactsContract.DisplayPhoto#CONTENT_URI}.  Otherwise, this will
     * be populated with the same value as {@link #PHOTO_THUMBNAIL_URI}.
     * A photo can be referred to either by a URI (this field) or by ID
     * (see {@link #PHOTO_ID}). If either PHOTO_FILE_ID or PHOTO_ID is not null,
     * PHOTO_URI and PHOTO_THUMBNAIL_URI shall not be null (but not necessarily
     * vice versa).  Thus using PHOTO_URI is a more robust method of retrieving
     * contact photos.
     *
     * <P>Type: TEXT</P>
     */
    public static final String PHOTO_URI = "photo_uri";

    /**
     * A URI that can be used to retrieve a thumbnail of the contact's photo.
     * A photo can be referred to either by a URI (this field or {@link #PHOTO_URI})
     * or by ID (see {@link #PHOTO_ID}). If PHOTO_ID is not null, PHOTO_URI and
     * PHOTO_THUMBNAIL_URI shall not be null (but not necessarily vice versa).
     * If the content provider does not differentiate between full-size photos
     * and thumbnail photos, PHOTO_THUMBNAIL_URI and {@link #PHOTO_URI} can contain
     * the same value, but either both shall be null or both not null.
     *
     * <P>Type: TEXT</P>
     */
    public static final String PHOTO_THUMBNAIL_URI = "photo_thumb_uri";

/**
*引用数据表中保存照片的行。照片罐
*可以通过ID（此字段）或URI（请参见{@link#PHOTO_缩略图_URI}）引用
*和{@link#PHOTO_URI}）。
*如果PHOTO#u ID为空，请查阅{@link#PHOTO#u URI}或{@link#PHOTO#u URI}，
*哪一种是引用联系人照片的更通用的机制，尤其是对于
*由非本地目录返回的联系人（请参阅{@link Directory}）。
*
*
类型：整数引用数据（\u id）
*/
公共静态最终字符串PHOTO\u ID=“PHOTO\u ID”；
/**
*全尺寸照片的照片文件ID。如果存在，这将用于填充
*{@link#PHOTO_URI}。该ID也可用于
*{@link contacts contract.DisplayPhoto#CONTENT_URI}创建照片的URI。
*如果存在这种情况，{@link#PHOTO_ID}也保证被填充。
*
*
类型：整数
*/
公共静态最终字符串PHOTO\u FILE\u ID=“PHOTO\u FILE\u ID”；
/**
*一个URI，可用于检索联系人的全尺寸照片。
*如果PHOTO_FILE_ID不为null，则将使用基于
*{@link contacts contract.DisplayPhoto#CONTENT_URI}。否则，这将
*使用与{@link#PHOTO_缩略图_URI}相同的值填充。
*照片可以通过URI（此字段）或ID引用
*（见{@link#PHOTO_ID}）。如果照片文件ID或照片ID不为空，
*照片URI和照片URI不得为空（但不一定为空
*反之亦然）。因此，使用PHOTO_URI是一种更健壮的检索方法
*联系照片。
*
*
类型：文本
*/
公共静态最终字符串PHOTO\u URI=“PHOTO\u URI”；
/**
*可用于检索联系人照片缩略图的URI。
*照片可以通过URI（此字段或{@link#photo_URI}）引用
*或按ID（见{@link#PHOTO_ID}）。如果PHOTO_ID不为null，则PHOTO_URI和
*照片缩略图URI不应为空（但不一定为空）。
*如果内容提供商不区分全尺寸照片
*缩略图照片、照片缩略图URI和{@link#照片URI}可以包含
*相同的值，但两者都应为null或都不为null。
*
*
类型：文本
*/
公共静态最终字符串PHOTO\u thumboil\u URI=“PHOTO\u thumb\u URI”；

Thansks用于响应。你可以发布代码来获取联系人图像的URI吗。？