• The system has been destroyed

     · Grape

    今天将自己的一个旧手机Redmi Note 8找出来，想刷一个最新版本的全球版ROM : ginkgo_global_images_V12.5.2.0.RCOMIXM_20220216.0000.00_11.0_global_da0a599e0c.tgz。下载解压完成，直接运行flash_all.sh脚本完成刷机，但系 …

  • Android Logcat Usage

     · Grape

    zsh:no matches found

    因为zsh缺省情况下始终自己解释这个firefox*，而不会传递给adb logcat来解释。 在~/.zshrc中加入: setopt no_nomatch, 然后进行source .zshrc命令

  • The Implementation Details of Android's force-stop

     · 28 min read  · Grape

    基于AOSP 8.0.1源码分析force-stop的实现细节。

    使用 force-stop

    am force-stop com.example

    com.example 是应用程序包名。

    am命令

    cat /system/bin/am
#!/system/bin/sh
if [ "$1" != "instrument" ] ; then
    cmd activity "$@"
else
    base=/system
    export CLASSPATH=$base/framework/am.jar
    exec app_process $base/bin com …

  • Debug Android Framework with Android Studio

     · Grape

    背景

    在阅读Android Framework代码时，有时需要动态调试加深理解，或者想调试某个API的实现原理（如startActivity）时，希望可以使用Android Studio调试，且可以对应到源码的每一行 …

  • Android Unicode 字符串

     · Grape

    相关源码

    String16

    // http://androidxref.com/6.0.1_r10/xref/system/core/libutils/String16.cpp#allocFromUTF8
static char16_t* allocFromUTF8(const char* u8str, size_t u8len)
{
    const ssize_t u16len = utf8_to_utf16_length(u8cur, u8len);
    utf8_to_utf16(u8cur …

  • Android 智能指针

     · Grape

    相关源码

    http://androidxref.com/6.0.1_r10/xref/system/core/include/utils/StrongPointer.h http://androidxref.com/6.0.1_r10/xref/system/core/include/utils/RefBase.h http://androidxref.com/6.0.1_r10/xref/system/core/libutils/RefBase.cpp

    StrongPointer

    INITIAL_STRONG_VALUE 为什么不是0 …

  • Android 源码开发

     · 1 min read  · Grape

    准备开发环境

    使用docker-aosp搭建

    编译步骤

    source build/envsetup.sh 
including device/asus/deb/vendorsetup.sh
including device/asus/flo/vendorsetup.sh
including device/asus/fugu/vendorsetup.sh
including device/generic/mini-emulator-arm64/vendorsetup.sh
including device/generic/mini-emulator-armv7-a-neon/vendorsetup.sh
including device/generic …

  • Android ClassLoader

     · 1 min read  · Grape

    Class

    // http://androidxref.com/6.0.1_r10/xref/libcore/libart/src/main/java/java/lang/Class.java
public final class Class<T> implements Serializable, AnnotatedElement, GenericDeclaration, Type {
    static native Class<?> classForName(String className, boolean shouldInitialize,
        ClassLoader classLoader) throws ClassNotFoundException;
}

    VMClassLoader

    // http://androidxref.com/6.0.1_r10/xref/libcore/libart/src …

  • Android ProgressBar Circle

     · 1 min read  · Grape

    Shape

    <?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape=["rectangle" | "oval" | "line" | "ring"] 
    android:innerRadius="integer"
    android:innerRadiusRatio="integer"
    android:thickness="integer"
    android:thicknessRatio="integer"
    android:useLevel="boolean"
    >
    <corners
        android:radius="integer"
        android:topLeftRadius="integer"
        android:topRightRadius="integer"
        android:bottomLeftRadius …

  • hacking android app with frida

     · Grape

    环境安装

    • frida-server
    • frida-tools
    pip3 install frida
pip3 install frida-tools

    基础用法

    frida-ps -U
frida-trace -U -i "recvfrom" com.android.chrome

    Javascript example 1

    Java.enumerateLoadedClasses(
  {
  "onMatch": function(className){ 
        console.log(className) 
    },
  "onComplete":function(){}
  }
)

    Javascript example 2:chrome.js

    Java.perform(function () {
    var Activity = Java.use …
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