Android之对外开放的api关联jni加载流程梳理

作者: 锄禾豆 | 来源:发表于2022-02-09 08:16 被阅读0次

Android之对外开放的api关联jni加载流程梳理
Android之JAVA、JNI、HAL加载流程梳理
Android JNI NDK 开发
JNIEnv API
关于阿里百川电商SDK出现SecurityGuard init
Android资源加载流程梳理
Android Studio配置CMake开发NDK
Android视图加载流程(2)之Window和WindowMa
深入理解JNI阅读笔记
NDK开发基础①使用Android Studio编写NDK

前言

Android是init进程孵化zygote进程，zygote进程孵化app进程

注：
7.1

zygote启动

system/core/rootdir/init.zygote32.rc

service zygote /system/bin/app_process -Xzygote /system/bin --zygote --start-system-server
    class main
    socket zygote stream 660 root system
    onrestart write /sys/android_power/request_state wake
    onrestart write /sys/power/state on
    onrestart restart audioserver
    onrestart restart cameraserver
    onrestart restart media
    onrestart restart netd
    writepid /dev/cpuset/foreground/tasks

app_process可执行文件的启动

frameworks/base/cmds/app_process/app_main.cpp

int main(int argc, char* const argv[])
{
    ···
    AppRuntime runtime(argv[0], computeArgBlockSize(argc, argv));
    ···
    runtime.start("com.android.internal.os.ZygoteInit", args, zygote);
    ···
}

注意
AppRuntime继承AndroidRuntime，即：
class AppRuntime : public AndroidRuntime

关注AndroidRuntime.start执行的业务

frameworks/base/core/jni/AndroidRuntime.cpp

void AndroidRuntime::start(const char* className, const Vector<String8>& options, bool zygote)
{
    ···
    /*
     * Register android functions.
     */
    if (startReg(env) < 0) {
        ALOGE("Unable to register all android natives\n");
        return;
    }
    ···
}

/*
 * Register android native functions with the VM.
 */
/*static*/ int AndroidRuntime::startReg(JNIEnv* env)
{
    ···
    if (register_jni_procs(gRegJNI, NELEM(gRegJNI), env) < 0) {
        env->PopLocalFrame(NULL);
        return -1;
    }
    ···
}

关注AndroidRuntime.gRegJNI的初始化

frameworks/base/core/jni/AndroidRuntime.cpp

static const RegJNIRec gRegJNI[] = {
    REG_JNI(register_com_android_internal_os_RuntimeInit),
    REG_JNI(register_android_os_SystemClock),
    REG_JNI(register_android_util_EventLog),
    REG_JNI(register_android_util_Log),
    REG_JNI(register_android_util_MemoryIntArray),
    REG_JNI(register_android_util_PathParser),
    REG_JNI(register_android_app_admin_SecurityLog),
    REG_JNI(register_android_content_AssetManager),
    REG_JNI(register_android_content_StringBlock),
    REG_JNI(register_android_content_XmlBlock),
    REG_JNI(register_android_text_AndroidCharacter),
    REG_JNI(register_android_text_StaticLayout),
    REG_JNI(register_android_text_AndroidBidi),
    REG_JNI(register_android_view_InputDevice),
    REG_JNI(register_android_view_KeyCharacterMap),
    REG_JNI(register_android_os_Process),
    REG_JNI(register_android_os_SystemProperties),
    REG_JNI(register_android_os_Binder),
    REG_JNI(register_android_os_Parcel),
    REG_JNI(register_android_nio_utils),
    REG_JNI(register_android_graphics_Canvas),
    REG_JNI(register_android_graphics_Graphics),
    REG_JNI(register_android_view_DisplayEventReceiver),
    REG_JNI(register_android_view_RenderNode),
    REG_JNI(register_android_view_RenderNodeAnimator),
    REG_JNI(register_android_view_GraphicBuffer),
    REG_JNI(register_android_view_DisplayListCanvas),
    REG_JNI(register_android_view_HardwareLayer),
    REG_JNI(register_android_view_ThreadedRenderer),
    REG_JNI(register_android_view_Surface),
    REG_JNI(register_android_view_SurfaceControl),
    REG_JNI(register_android_view_SurfaceSession),
    REG_JNI(register_android_view_TextureView),
    REG_JNI(register_com_android_internal_view_animation_NativeInterpolatorFactoryHelper),
    REG_JNI(register_com_google_android_gles_jni_EGLImpl),
    REG_JNI(register_com_google_android_gles_jni_GLImpl),
    REG_JNI(register_android_opengl_jni_EGL14),
    REG_JNI(register_android_opengl_jni_EGLExt),
    REG_JNI(register_android_opengl_jni_GLES10),
    REG_JNI(register_android_opengl_jni_GLES10Ext),
    REG_JNI(register_android_opengl_jni_GLES11),
    REG_JNI(register_android_opengl_jni_GLES11Ext),
    REG_JNI(register_android_opengl_jni_GLES20),
    REG_JNI(register_android_opengl_jni_GLES30),
    REG_JNI(register_android_opengl_jni_GLES31),
    REG_JNI(register_android_opengl_jni_GLES31Ext),
    REG_JNI(register_android_opengl_jni_GLES32),

    REG_JNI(register_android_graphics_Bitmap),
    REG_JNI(register_android_graphics_BitmapFactory),
    REG_JNI(register_android_graphics_BitmapRegionDecoder),
    REG_JNI(register_android_graphics_Camera),
    REG_JNI(register_android_graphics_CreateJavaOutputStreamAdaptor),
    REG_JNI(register_android_graphics_CanvasProperty),
    REG_JNI(register_android_graphics_ColorFilter),
    REG_JNI(register_android_graphics_DrawFilter),
    REG_JNI(register_android_graphics_FontFamily),
    REG_JNI(register_android_graphics_Interpolator),
    REG_JNI(register_android_graphics_LayerRasterizer),
    REG_JNI(register_android_graphics_MaskFilter),
    REG_JNI(register_android_graphics_Matrix),
    REG_JNI(register_android_graphics_Movie),
    REG_JNI(register_android_graphics_NinePatch),
    REG_JNI(register_android_graphics_Paint),
    REG_JNI(register_android_graphics_Path),
    REG_JNI(register_android_graphics_PathMeasure),
    REG_JNI(register_android_graphics_PathEffect),
    REG_JNI(register_android_graphics_Picture),
    REG_JNI(register_android_graphics_PorterDuff),
    REG_JNI(register_android_graphics_Rasterizer),
    REG_JNI(register_android_graphics_Region),
    REG_JNI(register_android_graphics_Shader),
    REG_JNI(register_android_graphics_SurfaceTexture),
    REG_JNI(register_android_graphics_Typeface),
    REG_JNI(register_android_graphics_Xfermode),
    REG_JNI(register_android_graphics_YuvImage),
    REG_JNI(register_android_graphics_drawable_AnimatedVectorDrawable),
    REG_JNI(register_android_graphics_drawable_VectorDrawable),
    REG_JNI(register_android_graphics_pdf_PdfDocument),
    REG_JNI(register_android_graphics_pdf_PdfEditor),
    REG_JNI(register_android_graphics_pdf_PdfRenderer),

    REG_JNI(register_android_database_CursorWindow),
    REG_JNI(register_android_database_SQLiteConnection),
    REG_JNI(register_android_database_SQLiteGlobal),
    REG_JNI(register_android_database_SQLiteDebug),
    REG_JNI(register_android_os_Debug),
    REG_JNI(register_android_os_FileObserver),
    REG_JNI(register_android_os_GraphicsEnvironment),
    REG_JNI(register_android_os_MessageQueue),
    REG_JNI(register_android_os_SELinux),
    REG_JNI(register_android_os_Trace),
    REG_JNI(register_android_os_UEventObserver),
    REG_JNI(register_android_net_LocalSocketImpl),
    REG_JNI(register_android_net_NetworkUtils),
    REG_JNI(register_android_net_TrafficStats),
    REG_JNI(register_android_os_MemoryFile),
    REG_JNI(register_com_android_internal_os_PathClassLoaderFactory),
    REG_JNI(register_com_android_internal_os_Zygote),
    REG_JNI(register_com_android_internal_util_VirtualRefBasePtr),
    REG_JNI(register_android_hardware_Camera),
    REG_JNI(register_android_hardware_camera2_CameraMetadata),
    REG_JNI(register_android_hardware_camera2_legacy_LegacyCameraDevice),
    REG_JNI(register_android_hardware_camera2_legacy_PerfMeasurement),
    REG_JNI(register_android_hardware_camera2_DngCreator),
    REG_JNI(register_android_hardware_Radio),
    REG_JNI(register_android_hardware_SensorManager),
    REG_JNI(register_android_hardware_SerialPort),
    REG_JNI(register_android_hardware_SoundTrigger),
    REG_JNI(register_android_hardware_UsbDevice),
    REG_JNI(register_android_hardware_UsbDeviceConnection),
    REG_JNI(register_android_hardware_UsbRequest),
    REG_JNI(register_android_hardware_location_ActivityRecognitionHardware),
    REG_JNI(register_android_hardware_location_ContextHubService),
    REG_JNI(register_android_media_AudioRecord),
    REG_JNI(register_android_media_AudioSystem),
    REG_JNI(register_android_media_AudioTrack),
    REG_JNI(register_android_media_JetPlayer),
    REG_JNI(register_android_media_RemoteDisplay),
    REG_JNI(register_android_media_ToneGenerator),

    REG_JNI(register_android_opengl_classes),
    REG_JNI(register_android_server_NetworkManagementSocketTagger),
    REG_JNI(register_android_ddm_DdmHandleNativeHeap),
    REG_JNI(register_android_backup_BackupDataInput),
    REG_JNI(register_android_backup_BackupDataOutput),
    REG_JNI(register_android_backup_FileBackupHelperBase),
    REG_JNI(register_android_backup_BackupHelperDispatcher),
    REG_JNI(register_android_app_backup_FullBackup),
    REG_JNI(register_android_app_Activity),
    REG_JNI(register_android_app_ActivityThread),
    REG_JNI(register_android_app_ApplicationLoaders),
    REG_JNI(register_android_app_NativeActivity),
    REG_JNI(register_android_util_jar_StrictJarFile),
    REG_JNI(register_android_view_InputChannel),
    REG_JNI(register_android_view_InputEventReceiver),
    REG_JNI(register_android_view_InputEventSender),
    REG_JNI(register_android_view_InputQueue),
    REG_JNI(register_android_view_KeyEvent),
    REG_JNI(register_android_view_MotionEvent),
    REG_JNI(register_android_view_PointerIcon),
    REG_JNI(register_android_view_VelocityTracker),

    REG_JNI(register_android_content_res_ObbScanner),
    REG_JNI(register_android_content_res_Configuration),

    REG_JNI(register_android_animation_PropertyValuesHolder),
    REG_JNI(register_com_android_internal_content_NativeLibraryHelper),
    REG_JNI(register_com_android_internal_net_NetworkStatsFactory),

};

这里就是api集中初始化jni的地方

以register_android_os_SystemClock注册为例

frameworks/base/core/jni/android_os_SystemClock.cpp

/*
 * JNI registration.
 */
static const JNINativeMethod gMethods[] = {
    /* name, signature, funcPtr */
    { "uptimeMillis",      "()J",
            (void*) android_os_SystemClock_uptimeMillis },
    { "elapsedRealtime",      "()J",
            (void*) android_os_SystemClock_elapsedRealtime },
    { "currentThreadTimeMillis",      "()J",
            (void*) android_os_SystemClock_currentThreadTimeMillis },
    { "currentThreadTimeMicro",       "()J",
            (void*) android_os_SystemClock_currentThreadTimeMicro },
    { "currentTimeMicro",             "()J",
            (void*) android_os_SystemClock_currentTimeMicro },
    { "elapsedRealtimeNanos",      "()J",
            (void*) android_os_SystemClock_elapsedRealtimeNano },
};
int register_android_os_SystemClock(JNIEnv* env)
{
    return RegisterMethodsOrDie(env, "android/os/SystemClock", gMethods, NELEM(gMethods));
}

//这里把java:android/os/SystemClock和android_os_SystemClock.cpp关联起来，也就是java和jni建立起来联系

注：
RegisterMethodsOrDie最后仍是关注：jniRegisterNativeMethods

流程：
core_jni_helpers.h
static inline int RegisterMethodsOrDie(JNIEnv* env, const char* className,
                                       const JNINativeMethod* gMethods, int numMethods) {
    int res = AndroidRuntime::registerNativeMethods(env, className, gMethods, numMethods);
    LOG_ALWAYS_FATAL_IF(res < 0, "Unable to register native methods.");
    return res;
}

AndroidRuntime.cpp
/*
 * Register native methods using JNI.
 */
/*static*/ int AndroidRuntime::registerNativeMethods(JNIEnv* env,
    const char* className, const JNINativeMethod* gMethods, int numMethods)
{
    return jniRegisterNativeMethods(env, className, gMethods, numMethods);
}

总结

app进程启动的时候进行了jni初始化等加载动作

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