Android 数据库加密 android-database-sqlcipher 开源版本编译过程

android {
   ...
   //此处看实际工程是否配置了统一的aar目录
    repositories {
        flatDir {
            dirs 'libs'
        }
    }
    ...
}

dependencies {
    ...
    api(name: "android-database-sqlcipher-4.1.3", ext: 'aar')
}

Building
In order to build android-database-sqlcipher from source you will need both the Android SDK as well as Android NDK. 
With different Android SDK installation approaches available. We currently recommend using Android NDK version r15c. 
To complete the make command, the ANDROID_NDK_ROOT environment variable must be defined which should point to your NDK root. 
Once you have cloned the repo, change directory into the root of the repository and run the following commands:
 # this only needs to be done once
 make init
 # to build the source for debug:
 make build-debug
 # or for a release build:
 make build-release

1.按Ctrl + Alt + T打开终端。打开后，运行下面的命令来添加PPA：
sudo add-apt-repository ppa:openjdk-r/ppa
2.之后，更新系统包缓存并安装OpenJDK 8： 
sudo apt-get update
sudo apt-get install openjdk-8-jdk
3.如果您的系统上安装了多个Java版本。运行下面的命令设置默认的Java：
sudo update-alternatives --config java
键入一个数字以选择Java版本。
设置默认的java版本
并通过运行以下命令设置默认Java编译器：
sudo update-alternatives --config javac 
4.最后通过运行以下步骤查看当前的Java版本：
java -version
它输出这样的东西：
openjdk版本“1.8.0_01-internal”

  export ANDROID_NDK_ROOT=/home/xiaoke/android-ndk-r15c
  export ANDROID_HOME=/home/xiaoke/Android/sdk
  export PATH=$PATH:$ANDROID_NDK_ROOT 

 1. make init
 2. make clean
 3. make build-release

-keep class net.sqlcipher.** { *; }
-keep class net.sqlcipher.database.* { *; }

-keep class net.sqlcipher.** { *; }
-keep class net.sqlcipher.database.* { *; }