随笔-HAL回调接口

HAL:

1. IDemo.hal

package vendor.tcl.hongxi@1.0;
import ISignalCb;interface IDemo {setCallback(ISignalCb cb) generates (bool value);
}

2. ISignalCb.hal

package vendor.tcl.hongxi@1.0;interface ISignalCb {signalEvent(int32_t status);
};

3. 同级Android.bp

// This file is autogenerated by hidl-gen -Landroidbp.hidl_interface {name: "vendor.tcl.hongxi@1.0",root: "vendor.tcl.hongxi",srcs: ["IDemo.hal","types.hal","ISignalCb.hal",],interfaces: ["android.hidl.base@1.0",],types: [...],...
}...
subdirs = ["default",
]

4. Demo.cpp

using vendor::tcl::hongxi::V1_0::ISignalCb;
...
Return<bool> IDemo::setCallback(const sp<ISignalCb>& callback) {ALOGD("hongxi.zhu: client call setCallback()");return android::HongxiManager::getInstance().setCallback(callback);
}
...

5. DemoManager.cpp

using vendor::tcl::hongxi::V1_0::ISignalCb;sp<vendor::tcl::hongxi::V1_0::ISignalCb> sigCb = NULL;
...
bool HongxiManager::setCallback(const sp<ISignalCb>& callback) {bool bRet = false;sigCb = callback;
}
...
//when the signal change we should notify client by this callback.
bool HongxiManager::updateSignal(int32_t status) {sigCb.signalEvent(status);
}
...

Client:

1. signal_cb.h

#ifndef __SIGNAL_CB_H__
#define __SIGNAL_CB_H__#include using namespace vendor::tcl::hongxi::V1_0;
using namespace android::hardware;namespace android {
class SignalInterface : public virtual vendor::tcl::hongxi::V1_0::ISignalCb{
public:SignalInterface(){}::android::hardware::Return<void> signalEvent(int32_t status) override;
};
}
#endif

#include "signal_cb.h"#define LOG_TAG     "SignalInterface"namespace android {
using namespace vendor::tcl::hongxi::V1_0;
using namespace android::hardware;::android::hardware::Return<void> SignalInterface::signalEvent(int32_t status) {//TO DOALOGD("HAL return signal %d", status);return ::android::hardware::Void();
}} //android

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