binder通信简单实现过程
服务端实现
- SoundPlaybackListen.h
#ifndef SOUND_PLAYBACK_LISTEN_H
#define SOUND_PLAYBACK_LISTEN_H
#include // for sockaddr_in
#include // for socket
#include // for socket
#include // for printf
#include // for exit
#include // for bzero
#include
#include
#include mIBinder;
int mState;
public:
};
#endif - SoundPlaybackListen.cpp(这里主要涉及到一个C++中使用pthread_create()函数)
在进行简单的参数传递的时候，比如传递一个int型的数据，只需要使用int(arg)进行转换即可，万万不能进行地址之类的转换。还有一个知识点就是如果线程中要用到类中的成员，可以在类中定义一个Object pThis,然后在构造函数中对这个pThis = this进行赋值，pthread_create参数传递的时候直接将这个pThis 传递给线程函数，线程函数中再将pThis 从void 转换到Object *即可使用pThis 中的成员了。
#include sm = defaultServiceManager(); //获取ServiceManager服务代理
status_t ret;
//register SoundPlaybackListen to ServiceManager
SoundPlaybackListen* mSoundPlaybackListen = new SoundPlaybackListen();
ret = sm->addService(String16("sound.playback.listen"), mSoundPlaybackListen); // 注册服务
LOGD("sound.playback.listen return %d", ret);
//call binder thread pool to start
ProcessState::self()->startThreadPool();
IPCThreadState::self()->joinThreadPool(true); //参数默认也是true，进入服务的循环监听状态
return 0;
} - Android.mk(要编译C++代码，Android.mk要包含以下内容)
LOCAL_PATH:=$(call my-dir)
rs_base_CFLAGS := -Wall -Wno-unused-parameter -Wno-unused-variable -fno-exceptions
ifeq ($(TARGET_BUILD_PDK), true)
rs_base_CFLAGS += -D__RS_PDK__
endif
ifneq ($(OVERRIDE_RS_DRIVER),)
rs_base_CFLAGS += -DOVERRIDE_RS_DRIVER=$(OVERRIDE_RS_DRIVER)
endif
ifneq ($(DISABLE_RS_64_BIT_DRIVER),)
rs_base_CFLAGS += -DDISABLE_RS_64_BIT_DRIVER
endif
ifeq ($(RS_FIND_OFFSETS), true)
rs_base_CFLAGS += -DRS_FIND_OFFSETS
endif
include $(CLEAR_VARS)
ifneq ($(HOST_OS),windows)
LOCAL_CLANG := true
endif
LOCAL_MODULE := SoundPlaybackListen
LOCAL_MODULE_TARGET_ARCH_WARN := arm mips mips64 x86 x86_64 arm64
LOCAL_SRC_FILES:= \
SoundPlaybackListen.cpp \
LOCAL_SHARED_LIBRARIES += libRS libRSCpuRef libc++
LOCAL_SHARED_LIBRARIES += liblog libcutils libutils libEGL libGLESv1_CM libGLESv2
LOCAL_SHARED_LIBRARIES += libui libgui libsync
LOCAL_SHARED_LIBRARIES += libbcc libbcinfo libLLVM
LOCAL_SHARED_LIBRARIES += \
libcutils \
libbinder \
libutils \
libhardware
LOCAL_C_INCLUDES += frameworks/compile/libbcc/include
LOCAL_C_INCLUDES += frameworks/rs/cpu_ref/linkloader/include
LOCAL_C_INCLUDES += external/libcxx/include
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include/
LOCAL_CFLAGS += $(rs_base_CFLAGS)
LOCAL_CPPFLAGS += -fexceptions
LOCAL_MODULE_TAGS := optional
include $(BUILD_EXECUTABLE)客户端实现
AudioTrack.cpp
#include <binder/IServiceManager.h>
#include <binder/IBinder.h>
#include <binder/Parcel.h>
#include <binder/ProcessState.h>
#include <binder/IPCThreadState.h>
#include <private/binder/binder_module.h>
#include <android/log.h>
//and by yjd
int AudioTrack::playbackStart()
{
sp<IServiceManager> sm = defaultServiceManager(); //获取ServiceManager服务代理
sp<IBinder> mIBinder = sm->getService(String16("sound.playback.listen")); //查询服务
if (mIBinder == NULL)
{
ALOGI("Can't find binder service \"sound.playback.listen\"");
return -1;
}
Parcel in, out;
AudioTrack *mAudioTrack = new AudioTrack();
//in.writeStrongBinder(sp(mAudioTrack));
int ret = mIBinder->transact(1, in, &out, 0); ////这里的1对应服务端onTransact中code的1
ALOGI("playbackStart return %d", ret);
return 0;
}
int AudioTrack::playbackStop()
{
sp<IServiceManager> sm = defaultServiceManager(); //获取ServiceManager服务代理
sp<IBinder> mIBinder = sm->getService(String16("sound.playback.listen")); //查询服务
if (mIBinder == NULL)
{
ALOGI("Can't find binder service \"sound.playback.listen\"");
return -1;
}
Parcel in, out;
//AudioTrack *mAudioTrack = new AudioTrack();
//in.writeStrongBinder(sp(mAudioTrack));
int ret = mIBinder->transact(2, in, &out, 0); //这里的2对应服务端onTransact中code的2
ALOGI("playbackStart return %d");
return 0;
}