在AndroidStudio中开发系统APP_android studio开发app

1.AndroidStudio项目中调用系统API

AndroidStudio项目中调用系统API（比如调用 @UnsupportedAppUsage 的方法），需要引入系统framework.jar包。
第一步如下图，fremework.jar 放在app/systemjar/目录下

第二步，在app下的build.gradle中添加如下配置：

    gradle.projectsEvaluated {
        tasks.withType(JavaCompile) {
            Set<File> fileSet = options.bootstrapClasspath.getFiles();
            List<File> newFileList = new ArrayList<>()
            newFileList.add(new File("systemjar/framework.jar"))
            newFileList.addAll(fileSet)
            options.bootstrapClasspath = files(newFileList.toArray())
        }
    }
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2 在androidstudio中使用系统签名

android系统使用的签名通常是platform.pk8和 platform.x509.pem，这里需要转成keystore文件提供给Androidstudio使用。
第一步，使用keytool-importkeypair工具通过平台签名文件platform.pk8和 platform.x509.pem生成platform.keystore，注意生成platform.keystore是的密码和别名。

./keytool-importkeypair -k ./platform.keystore -p android -pk8 platform.pk8 -cert platform.x509.pem -alias platform
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第二步，将生成的platform.keystore放在app/signature目录下。

第三步，在build.gradle中添加如下配置。

    signingConfigs {
        release {
            storeFile file("signature/platform.keystore")
            storePassword 'android'
            keyAlias 'platform'
            keyPassword 'android'
        }

        debug {
            storeFile file("signature/platform.keystore")
            storePassword 'android'
            keyAlias 'platform'
            keyPassword 'android'
        }
    }
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keytool-importkeypair 工具脚本代码实现如下：

#! /bin/bash
#
# This file is part of keytool-importkeypair.
#
# keytool-importkeypair is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# keytool-importkeypair is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with keytool-importkeypair.  If not, see
# <http://www.gnu.org/licenses/>.
#

DEFAULT_KEYSTORE=$HOME/.keystore
keystore=$DEFAULT_KEYSTORE
pk8=""
cert=""
alias=""
passphrase=""
tmpdir=""

scriptname=`basename $0`

usage() {
cat << EOF
usage: ${scriptname} [-k keystore] [-p storepass]
-pk8 pk8 -cert cert -alias key_alias

This script is used to import a key/certificate pair
into a Java keystore.

If a keystore is not specified then the key pair is imported into
~/.keystore in the user's home directory.

The passphrase can also be read from stdin.
EOF
}

cleanup() {
if [ ! -z "${tmpdir}" -a -d ${tmpdir} ]; then
   rm -fr ${tmpdir}
fi
}

while [ $# -gt 0 ]; do
        case $1
        in
                -p | --passphrase | -passphrase)
                        passphrase=$2
                        shift 2
        ;;
                -h | --help)
                        usage
                        exit 0
        ;;
                -k | -keystore | --keystore)
                        keystore=$2
                        shift 2
        ;;
                -pk8 | --pk8 | -key | --key)
                        pk8=$2
                        shift 2
        ;;
                -cert | --cert | -pem | --pem)
                        cert=$2
                        shift 2
        ;;
                -a | -alias | --alias)
                        alias=$2
                        shift 2
        ;;
                *)
                        echo "${scriptname}: Unknown option $1, exiting" 1>&2
                        usage
                        exit 1
        ;;
        esac
done

if [ -z "${pk8}" -o -z "${cert}" -o -z "${alias}" ]; then
   echo "${scriptname}: Missing option, exiting..." 1>&2
   usage
   exit 1
fi


for f in "${pk8}" "${cert}"; do
    if [ ! -f "$f" ]; then
       echo "${scriptname}: Can't find file $f, exiting..." 1>&2
       exit 1
    fi
done

if [ ! -f "${keystore}" ]; then
   storedir=`dirname "${keystore}"`
   if [ ! -d "${storedir}" -o ! -w "${storedir}" ]; then
      echo "${scriptname}: Can't access ${storedir}, exiting..." 1>&2
      exit 1
   fi
fi

# Create temp directory ofr key and pkcs12 bundle
tmpdir=`mktemp -q -d "/tmp/${scriptname}.XXXX"`

if [ $? -ne 0 ]; then
   echo "${scriptname}: Can't create temp directory, exiting..." 1>&2
   exit 1
fi

key="${tmpdir}/key"
p12="${tmpdir}/p12"

if [ -z "${passphrase}" ]; then
   # Request a passphrase
  read -p "Enter a passphrase: " -s passphrase
  echo ""
fi

# Convert PK8 to PEM KEY
openssl pkcs8 -inform DER -nocrypt -in "${pk8}" -out "${key}"

# Bundle CERT and KEY
openssl pkcs12 -export -in "${cert}" -inkey "${key}" -out "${p12}" -password pass:"${passphrase}" -name "${alias}"

# Print cert
echo -n "Importing \"${alias}\" with "
openssl x509 -noout -fingerprint -in "${cert}"

# Import P12 in Keystore
keytool -importkeystore -deststorepass "${passphrase}" -destkeystore "${keystore}" -srckeystore "${p12}" -srcstoretype PKCS12 -srcstorepass "${passphrase}" 

# Cleanup
cleanup

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