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Symbols count in article: 13k Reading time ≈ 12 mins.

Flutter UI容器

承载Flutter的Android容器

Flutter容器包含有FlutterActivity和FlutterFragmentActivity。他们分别实现了Provider, PluginRegistry, ViewFactory，二者的方法主要通过FlutterActivityDelegate 代理出去

FlutterActivityDelegateFlutterActivityEventsProviderPluginRegistryFlutterActivityActivityViewFactoryFlutterFragmentActivityFragmentActivity
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Symbols count in article: 1.7k Reading time ≈ 2 mins.

Perpare Env

下载 repo 工具:

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mkdir ~/bin
PATH=~/bin:$PATH
curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
chmod a+x ~/bin/repo

使用每月更新的初始化包

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wget -c https://mirrors.tuna.tsinghua.edu.cn/aosp-monthly/aosp-latest.tar # 下载初始化包
tar xf aosp-latest.tar
cd AOSP   # 解压得到的 AOSP 工程目录
# 这时 ls 的话什么也看不到，因为只有一个隐藏的 .repo 目录
repo sync # 正常同步一遍即可得到完整目录
# 或 repo sync -l 仅checkout代码
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Symbols count in article: 15k Reading time ≈ 13 mins.

ViewModel

ViewModelProviders

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class TestViewModel extends ViewModel

TestViewModel test = ViewModelProviders.of(this).get(TestViewModel.class);

在ViewModelProviders中会创建ViewModelProvider，通过ViewModelProvider来管理ViewModel。

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@NonNull
@MainThread
public static ViewModelProvider of(@NonNull FragmentActivity activity, @Nullable Factory factory) {
    Application application = checkApplication(activity);
    if (factory == null) {
        factory = AndroidViewModelFactory.getInstance(application);
    }

    return new ViewModelProvider(ViewModelStores.of(activity), (Factory)factory);
}
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Symbols count in article: 9.2k Reading time ≈ 8 mins.

主要包含：

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settings.gradle
build.gradle
app/build.gradle

以及gradle wrapper下的gradle jar包和配置文件

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Symbols count in article: 3.8k Reading time ≈ 3 mins.

C++ Hook

LD_PRELOAD 预加载hook so

通过LD_PRELOAD

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#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[])
{
    if( strcmp(argv[1], "password") )
    {
        printf("Incorrect password\n");
    }
    else
    {
        printf("Correct password\n");
    }
    return 0;
}
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gcc -o main main.c
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Symbols count in article: 1.1k Reading time ≈ 1 mins. 
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git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
export PATH=$PATH:/home/zauther/Libraries/depot_tools
fetch --nohooks android

gclient sync
build/install-build-deps-android.sh
gclient runhooks
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gn args out/Default

>> 
target_os = "android"
target_cpu = "arm64"
treat_warnings_as_errors=false

autoninja -C out/Default chrome_public_apk
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build/android/gradle/generate_gradle.py --output-directory out/Default --project-dir out/Chrome-Android
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git checkout 92.0.4480.2
gclient sync --with_branch_heads
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Symbols count in article: 430 Reading time ≈ 1 mins. 
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help
  -- SSL Proxing
         -- Save Charles Root Certificate

得到 charles-ssl-proxying-certificate.pem

转化格式

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openssl x509 -in charles-ssl-proxying-certificate.pem -inform PEM -out charles-ssl-proxying-certificate.crt

复制到ca证书目录（这里新建了一个目录）

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sudo mkdir /usr/share/ca-certificates/extra
sudo cp charles-ssl-proxying-certificate.crt /usr/share/ca-certificates/extra/charles-ssl-proxying-certificate.crt

配置

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sudo dpkg-reconfigure ca-certificates

选择Yes后，弹出证书列表，选择charles证书即可。

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Symbols count in article: 901 Reading time ≈ 1 mins.

CUDA安装

NVIDIA® GPU 驱动程序

https://www.nvidia.com/drivers
根据显卡型号下载 NVIDIA-Linux-x86_64-460.73.01.run

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sudo chmod +x NVIDIA-Linux-x86_64-460.73.01.run
sudo ./NVIDIA-Linux-x86_64-460.73.01.run

Ubuntu没必要安装这个版本，直接在“软件和更新”中选择NVIDIA的驱动更好

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Symbols count in article: 25k Reading time ≈ 23 mins.

1. 首次安装树莓派

1.1 安装树莓派

1.1.1 下载树莓派镜像(可跳过)

从https://www.raspberrypi.org/software/operating-systems/ 下载树莓派镜像，为了快速下载，这里下载的是 Raspberry Pi OS Lite ，体积最小，后面主要在命令行环境使用。这里下载的版本是 2021-03-04-raspios-buster-armhf-lite.zip
准备2张SD卡，一张安装树莓派系统（这里取代号A卡），另外一张（B卡）用于我们自己的构建系统。

1.1.2 安装树莓派系统

在Ubuntu主机上安装树莓派烧写工具 rpi-imager

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sudo apt install rpi-imager

在命令行执行 rpi-imager 后会出现工具

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rpi-imager
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Symbols count in article: 1.7k Reading time ≈ 2 mins.

SD卡分区

将SD卡分区，通过fdisk命令分区为2个区，100M的boot区，剩下的rootfs区，boot区
boot区格式化为fat格式，rootfs格式化为ext4
将boot挂在到/mnt/boot位置

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sudo mkfs.vfat /dev/sdb1
sudo mount /dev/sdb1 /mnt/boot

准备树莓派Boot文件

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git clone https://github.com/raspberrypi/firmware.git
cd firmware
cp -R boot/* /mnt/boot
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