android 取得系统联系人的头像

ImageView imageView=new ImageView(this);
Uri uri=ContactsContract.Data.CONTENT_URI;
Cursor cursor=getContentResolver().query(uri, new String[]{ContactsContract.Data.DATA15}, null, null, null);
cursor.moveToFirst();
do{
byte[] str=cursor.getBlob(cursor.getColumnIndex(ContactsContract.Data.DATA15));

if(str!=null){
InputStream inputStream=new ByteArrayInputStream(str);
Bitmap bitmap=BitmapFactory.decodeStream(inputStream);
imageView.setImageBitmap(bitmap);
}
}while(cursor.moveToNext());
setContentView(imageView);