RK3588 framework自定义service实现开机启动

在/system/bin/下的可执行文件可以通过adb shell 运行，那怎么实现开机自己启动呢

一、 首先先仿照bootanimation写一个可以悬浮在屏幕上的图形

1. 在frameworks/base/cmds/下新建你自己文件夹（在这儿我起名为mytestdemo），文件夹下存放Android.bp，xxx.cpp（MyTestDemo.cpp）

2. MyTestDemo.cpp
   通过新增一个Layer，在这边不多讲解

#define LOG_TAG "SurfaceTestDemo"

#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/ProcessState.h>
#include <gui/ISurfaceComposerClient.h>
#include <gui/Surface.h>
#include <gui/SurfaceComposerClient.h>
#include <gui/SurfaceControl.h>
#include <hardware/gralloc.h>
#include <sys/resource.h>
#include <system/window.h>
#include <utils/Log.h>
#include <utils/RefBase.h>
using namespace android;

void fillRGBA8Buffer(uint8_t* img, int width, int height, int stride, int r, int g, int b) {
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            uint8_t* pixel = img + (4 * (y * stride + x));
            pixel[0] = r;
            pixel[1] = g;
            pixel[2] = b;
            pixel[3] = 255;
        }
    }
}

int MyTestDemo() {
    status_t err = NO_ERROR;
    int countFrame = 0;
    ANativeWindow_Buffer nativeBuffer;

    sp<ProcessState> proc(ProcessState::self());
    ProcessState::self()->startThreadPool();

    sp<SurfaceComposerClient> surfaceComposerClient = new SurfaceComposerClient();
    err = surfaceComposerClient->initCheck();
    if (err != NO_ERROR) {
        ALOGD("SurfaceComposerClient::initCheck error: %#x\n", err);
        return -1;
    }

    // Get main display parameters.
    sp<IBinder> displayToken = SurfaceComposerClient::getInternalDisplayToken();
    if (displayToken == nullptr) return -1;

    ui::DisplayMode displayMode;
    const status_t error = SurfaceComposerClient::getActiveDisplayMode(displayToken, &displayMode);
    if (error != NO_ERROR) return -1;

    ui::Size resolution(200, 200);
    // create the surface
    sp<SurfaceControl> surfaceControl =
            surfaceComposerClient->createSurface(String8("SurfaceTestDemo"), resolution.getWidth(),
                                                 resolution.getHeight(), PIXEL_FORMAT_RGBA_8888,
                                                 ISurfaceComposerClient::eFXSurfaceBufferState,
                                                 /*parent*/ nullptr);

    SurfaceComposerClient::Transaction{}
            .setLayer(surfaceControl, std::numeric_limits<int32_t>::max())
            .setPosition(surfaceControl, (displayMode.resolution.getWidth() - 200) / 2,
                         (displayMode.resolution.getHeight() - 200) / 2)
            .show(surfaceControl)
            .apply();

    int mWidth = resolution.getWidth();
    int mHeight = resolution.getHeight();
    sp<Surface> surface = surfaceControl->getSurface();

    while (1) {
        countFrame = (countFrame + 1) % 3;
        surface->lock(&nativeBuffer, NULL);
        fillRGBA8Buffer((uint8_t*)nativeBuffer.bits, mWidth, mHeight, nativeBuffer.stride,
                        countFrame == 0 ? 255 : 0, countFrame == 1 ? 255 : 0,
                        countFrame == 2 ? 255 : 0);
        surface->unlockAndPost();
        sleep(1);
    }

    return err;
}

int main() {
    setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_DISPLAY);

    sp<ProcessState> proc(ProcessState::self());
    ProcessState::self()->startThreadPool();

    MyTestDemo();

    IPCThreadState::self()->joinThreadPool();

    return 0;
}

3. Android.bp

package {
    // See: http://go/android-license-faq
    // A large-scale-change added 'default_applicable_licenses' to import
    // all of the 'license_kinds' from "frameworks_base_license"
    // to get the below license kinds:
    //   SPDX-license-identifier-Apache-2.0
    default_applicable_licenses: ["frameworks_base_license"],
}

cc_binary {
    name: "mytestdemo",

    header_libs: ["jni_headers"],

    shared_libs: [
        "libbase",
        "libbinder",
        "libcutils",
        "libEGL",
        "libfmq",
        "libGLESv1_CM",
        "libGLESv2",
        "libgui",
        "libhidlbase",
        "liblayers_proto",
        "liblog",
        "libnativewindow",
        "libprocessgroup",
        "libprotobuf-cpp-lite",
        "libsync",
        "libtimestats",
        "libui",
        "libinput",
        "libutils",
        "libSurfaceFlingerProp",
        "librkgfx_dc",
    ],

    srcs: [
        "MyTestDemo.cpp",
    ],

    cflags: [
        "-Wno-deprecated-declarations",
    ],
}

二、 开机自动启动这个services

1. 在system/core/rootdir/init.rc中添加

service mytest /system/bin/mytestdemo
    class core animation
    user graphics
    group graphics audio

2. 在system/sepolicy/private/下与system/sepolicy/prebuilts/api/你自己的版本/private/两个目录下都要新建mytest.te
   mytest.te

# wzxtest
type mytest, domain, coredomain;
type mytest_exec, exec_type, file_type, system_file_type;
init_daemon_domain(mytest)

3. 在system/sepolicy/private/file_contexts下与system/sepolicy/prebuilts/api/你自己的版本/private/file_contexts 新增

/system/bin/mytestdemo u:object_r:mytest_exec:s0

三、 编译替换

1. 首先编译出super.img。根据编译手册在根目录下

./build.sh -A

编译出后烧录。烧录时根据烧录手册一定要被识别为LOADER。
2. 在frameworks/base/cmds/mytestdemo下，执行

mm

编译出的可执行文件push到/system/bin/