Android 11.0 adds shutdown ringtone function

1 Introduction

 In the 11.0 system rom customization development, in the native system, the startup ringtone and shutdown ringtone are not supported by default. The system supports startup animation and shutdown animation and other functions by default, so about adding startup ringtones and shutdown ringtones. Related functions
, You need to add related shutdown ringtones yourself

2. Add the core class for the shutdown ringtone function

frameworks\base\cmds\bootanimation\BootAnimation.h
frameworks\base\cmds\bootanimation\BootAnimation.cpp

3. Analysis and implementation of the core functions realized by adding the shutdown ringtone function
3.1 Add the variables and methods required to play the shutdown ringtone in BootAnimation.h

class BootAnimation : public Thread, public IBinder::DeathRecipient
{
....
private:
    virtual bool        threadLoop();
    virtual status_t    readyToRun();
    virtual void        onFirstRef();
    virtual void        binderDied(const wp<IBinder>& who);

    bool                updateIsTimeAccurate();

    class TimeCheckThread : public Thread {
    public:
        explicit TimeCheckThread(BootAnimation* bootAnimation);
        virtual ~TimeCheckThread();
    private:
        virtual status_t    readyToRun();
        virtual bool        threadLo