Binder Bp is used in a variety of processes

Scene:

1) IMediaPlayer.cpp

Bp, Bn

Sp<igraphicbufferproducer> Bufferproducer =

Interface_cast<igraphicbufferproducer> (Data.readstrongbinder ());

Reply->writeint32 (Setvideosurfacetexture (bufferproducer));

Use in Mediaplayerservice
sp<igraphicbufferproducer>& Bufferproducer the BP interacts with Bn

2) Pass the BP object in the Mediaplayerservice process to another process using the

Virtual status_t Connect (const sp<igraphicbufferproducer> &bufferproduce, Sp<iremotedisplayclient> & Amp;sinkclient)

{

Parcel data, reply;

Data.writeinterfacetoken (Iremotedisplay::getinterfacedescriptor ());

Data.writestrongbinder (Iinterface::asbinder (bufferproduce));

Data.writestrongbinder (Iinterface::asbinder (sinkclient));

Remote ()->transact (CONNECT, data, &reply);

return Reply.readint32 ();

}

status_t bnremotedisplay::ontransact (...). ）{.........

Case connect:{

Check_interface (iremotedisplay, data, reply);

sp<igraphicbufferproducer> bufferproducer = Igraphicbufferproducer::asinterface (Data.readStrongBinder ()); //The BP object obtained from the Mediaplayerservice process can also be used here

sp<iremotedisplayclient> Clientsink = interface_cast<iremotedisplayclient> (Data.readStrongBinder ());

Reply->writeint32 (Connect (bufferproducer,clientsink));

return no_error;

}

3) A bnxx can be inherited by multiple classes and then obtained at different interfaces by BP

Return interface_cast<iremotedisplay> (Reply.readstrongbinder ());

Can distinguish between the corresponding class of Bn

<IRemoteDisplay> corresponds to Remotedisplay not one by one, Iremotedisplay may correspond to multiple classes

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Binder Bp is used in a variety of processes