Drawing on top camera view

i just begining to create an application for mobile phone. Im have tried to put the camera preview (VideoControl) on GameCanvas.
but i can't draw something else on top of the preview window because it is always covered by the preview.
So, how can i do that? How can i draw something else on top of the camera preview?
TiA

but i want it stay visible... so it seems impossible... am i right?
and another question : i can't get a snapshot if the controller is invisible? is there anyway to get a snapshot while the controller (the camera preview) is invisible???
TiA

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Hi dude,
Please refere below code
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SQL> DROP MATERIALIZED VIEW scott.emp_v_MV;
SQL> CREATE MATERIALIZED VIEW scott.emp_v_MV
NOLOGGING
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AS
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REFRESH_FAST                   N
REFRESH_FAST_AFTER_INSERT      N named view in FROM list not supported   for this type MV
REFRESH_FAST_AFTER_INSERT      N named view in FROM list not supported for this type MV
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REFRESH_FAST_AFTER_ANY_DML     N see the reason why REFRESH_FAST_AFTER_ONETAB_DML is disabled
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SQL> DROP MATERIALIZED VIEW scott.emp_v_MV;
SQL> CREATE MATERIALIZED VIEW scott.emp_v_MV
NOLOGGING
PARALLEL
BUILD IMMEDIATE
REFRESH FORCE ON DEMAND
ENABLE QUERY REWRITE
AS
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SQL> SELECT capability_name, possible, SUBSTR(msgtxt,1,60) AS msgtxt
           FROM mv_capabilities_table
           WHERE capability_name like '%FAST%';
CAPABILITY_NAME                P MSGTXT
REFRESH_FAST                   Y
REFRESH_FAST_AFTER_INSERT      Y
REFRESH_FAST_AFTER_ONETAB_DML Y
REFRESH_FAST_AFTER_ANY_DML     Y
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WITH SEQUENCE, ROWID (JOB, DEPTNO, SAL)
INCLUDING NEW VALUES;
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WITH SEQUENCE, ROWID (DEPTNO)
INCLUDING NEW VALUES;
SQL> DROP MATERIALIZED VIEW scott.sal_dept_mv;
SQL> CREATE MATERIALIZED VIEW scott.sal_dept_mv
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           PARALLEL
           BUILD IMMEDIATE
           REFRESH FORCE ON DEMAND
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           AS
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          FROM emp e,
               dept d
          WHERE e.deptno=d.deptno
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Drawing on top camera view

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