Android C++;不满足抽象方法的实现
在一个Android项目中,我有一个非常混乱的继承情况,我不能完全理解。 这是我在编译时遇到的错误:Android C++;不满足抽象方法的实现,android,c++,inheritance,abstract-class,Android,C++,Inheritance,Abstract Class,在一个Android项目中,我有一个非常混乱的继承情况,我不能完全理解。 这是我在编译时遇到的错误: proprietary/external/audioATCmdHandlerServer/AudioCmdHandler.cpp:4458:51: error: cannot allocate an object of abstract type 'android::MediaRecorder' m_MediaRecorderClient = new MediaRecorder
proprietary/external/audioATCmdHandlerServer/AudioCmdHandler.cpp:4458:51: error: cannot allocate an object of abstract type 'android::MediaRecorder'
m_MediaRecorderClient = new MediaRecorder();
^
In file included from proprietary/external/audioATCmdHandlerServer/AudioCmdHandler.h:101:0,
from proprietary/external/audioATCmdHandlerServer/AudioCmdHandler.cpp:199:
frameworks/av/include/media/mediarecorder.h:245:7: note: because the following virtual functions are pure within 'android::MediaRecorder':
class MediaRecorder : public BnMediaRecorderClient,
^
In file included from frameworks/av/include/media/mediarecorder.h:30:0,
from proprietary/external/audioATCmdHandlerServer/AudioCmdHandler.h:101,
from proprietary/external/audioATCmdHandlerServer/AudioCmdHandler.cpp:199:
frameworks/av/include/media/IMediaRecorderClient.h:32:18: note: virtual void android::IMediaRecorderClient::readAudio()
virtual void readAudio() = 0;
这是MediaRecorder.h中的MediaRecorder类
............
.......
#include <media/IMediaRecorderClient.h>
.......
...........
class MediaRecorder : public BnMediaRecorderClient,
public virtual IMediaDeathNotifier
{
public:
MediaRecorder();
~MediaRecorder();
void died();
status_t initCheck();
status_t setCamera(const sp<ICamera>& camera, const sp<ICameraRecordingProxy>& proxy);
status_t setPreviewSurface(const sp<IGraphicBufferProducer>& surface);
status_t setVideoSource(int vs);
status_t setAudioSource(int as);
status_t setOutputFormat(int of);
status_t setVideoEncoder(int ve);
status_t setAudioEncoder(int ae);
status_t setOutputFile(const char* path);
status_t setOutputFile(int fd, int64_t offset, int64_t length);
status_t setVideoSize(int width, int height);
status_t setVideoFrameRate(int frames_per_second);
status_t setParameters(const String8& params);
status_t setListener(const sp<MediaRecorderListener>& listener);
status_t setClientName(const String16& clientName);
status_t prepare();
status_t getMaxAmplitude(int* max);
status_t start();
status_t stop();
status_t reset();
status_t init();
status_t close();
status_t release();
void notify(int msg, int ext1, int ext2);
sp<IGraphicBufferProducer> querySurfaceMediaSourceFromMediaServer();
#ifdef MTK_AOSP_ENHANCEMENT
status_t setParametersExtra(const String8& params);
#endif
private:
void doCleanUp();
status_t doReset();
sp<IMediaRecorder> mMediaRecorder;
sp<MediaRecorderListener> mListener;
// Reference to IGraphicBufferProducer
// for encoding GL Frames. That is useful only when the
// video source is set to VIDEO_SOURCE_GRALLOC_BUFFER
sp<IGraphicBufferProducer> mSurfaceMediaSource;
media_recorder_states mCurrentState;
bool mIsAudioSourceSet;
bool mIsVideoSourceSet;
bool mIsAudioEncoderSet;
bool mIsVideoEncoderSet;
bool mIsOutputFileSet;
Mutex mLock;
Mutex mNotifyLock;
};
。。。。。。。。。。。。
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#包括
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类MediaRecorder:public BnMediaRecorderClient,
公共虚拟死亡通知程序
{
公众:
MediaRecorder();
~MediaRecorder();
虚空死亡();
status_t initCheck();
状态设置摄像头(常量sp和摄像头、常量sp和代理);
状态设置预览表面(常数sp和表面);
状态设置视频源(int vs);
状态设置音频源(int as);
状态设置输出格式(int of);
状态设置视频编码器(int-ve);
状态设置音频编码器(int ae);
状态设置输出文件(常量字符*路径);
状态设置输出文件(int fd、int64偏移量、int64长度);
状态设置视频大小(整数宽度、整数高度);
状态设置视频帧率(每秒整数帧);
状态设置参数(常量字符串8和参数);
状态设置侦听器(常量sp和侦听器);
状态\u t setClientName(常量String16和clientName);
状态准备();
状态获取最大振幅(int*max);
状态_t start();
状态停止();
状态重置();
status_t init();
状态_t close();
状态释放();
无效通知(int msg、int ext1、int ext2);
sp querySurfaceMediaSourceFromMediaServer();
#ifdef MTK_AOSP_增强
状态设置参数SEXTRA(常量字符串8和参数);
#恩迪夫
私人:
void doCleanUp();
status_t doReset();
sp-mmedia记录器;
sp-mListener;
//对IGP生产商的参考
//用于编码GL帧。仅当
//视频源被设置为视频源缓冲区
sp mSurfaceMediaSource;
媒体记录器状态mCurrentState;
布尔错误音频源集;
bool-mIsVideoSourceSet;
bool-mIsAudioEncoderSet;
bool-mIsVideoEncoderSet;
布尔输出错误文件集;
互斥锁;
互斥锁mNotifyLock;
};
这是IMediaRecorderClient.h
#include <utils/RefBase.h>
#include <binder/IInterface.h>
#include <binder/Parcel.h>
namespace android {
class IMediaRecorderClient: public IInterface
{
public:
DECLARE_META_INTERFACE(MediaRecorderClient);
virtual void notify(int msg, int ext1, int ext2) = 0;
virtual void readAudio() = 0;
};
// ----------------------------------------------------------------------------
class BnMediaRecorderClient: public BnInterface<IMediaRecorderClient>
{
public:
virtual status_t onTransact( uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags = 0);
};
};
#包括
#包括
#包括
名称空间android{
IMediaRecorderClient类:公共接口
{
公众:
声明元接口(MediaRecorderClient);
虚拟无效通知(int msg,int ext1,int ext2)=0;
虚拟void readAudio()=0;
};
// ----------------------------------------------------------------------------
类BnMediaRecorderClient:公共BnInterface
{
公众:
虚拟状态合同(uint32代码,
const地块和数据,
包裹*答复:,
uint32_t标志=0);
};
};
这是IMediaRecorderClient.cpp的摘录,在我看来,它实现了抽象方法virtual void readAudio()
#包括
#包括
#包括
#包括
名称空间android{
枚举{
NOTIFY=IBinder::第一次调用\u事务,
读音,
};
BpMediaRecorderClient类:公共BpInterface
{
公众:
BpMediaRecorderClient(常量sp和impl)
:BpInterface(impl)
{
}
虚拟无效通知(int msg、int ext1、int ext2)
{
包裹数据,回复;
writeInterfaceToken(IMediaRecorderClient::GetInterfacedDescriptor());
数据写入32(msg);
数据写入32(ext1);
数据写入32(ext2);
remote()->transact(通知、数据和回复,IBinder::FLAG_单向);
}
虚拟void readAudio()
{
包裹数据,回复;
writeInterfaceToken(IMediaRecorderClient::GetInterfacedDescriptor());
remote()->transact(读取音频、数据和回复,IBinder::FLAG\u单向);
}
};
我哪里错了?编译器在下面的
AudioCmdHandler.cpp
语句中告诉您:
m_MediaRecorderClient = new MediaRecorder();
有人试图实例化类MediaRecorder
,它是一个抽象类。抽象类意味着它至少有一个未定义的虚拟函数,在您的情况下,它是readAudio()
怎么回事?
您显示的MediaRecorder
的类定义没有提供readAudio()
。但是该类继承自BnMediaRecorderClient
。该类也不提供readAudio()
,而是继承自模板BnInterface
我不知道template类BnInterface
是如何定义的,但我想它是一个扩展了作为参数提供的接口的类,因此,MediaRecorder
最终将间接继承IMediaRecorderClient
这个函数定义了这个纯虚函数:
virtual void readAudio() = 0;
如何解决它?
您必须在
MediaRecorder
中提供并实现此函数,以便能够实例化此类的对象。编译器在AudioCmdHandler.cpp
的以下语句中告诉您:
m_MediaRecorderClient = new MediaRecorder();
有人试图实例化类MediaRecorder
,它是一个抽象类。抽象类意味着它至少有一个未定义的虚拟函数,在您的情况下,它是readAudio()
怎么回事?
您显示的MediaRecorder
的类定义没有提供readAudio()
。但是该类继承自BnMediaRecorderClient
。该类也不提供readAudio()
,而是继承自模板BnInterface
我不知道怎么做