recompress-apk

#!/bin/bash

function zip_align()
{
    TEMP="${1}"
    DEST="${2}"

    if [ ! -f "${TEMP}" ]; then
        echo "${TEMP} is NOT a file"
        return
    fi

    if [ -f "${DEST}" ]; then
        rm -f "${DEST}"
    fi

    zipalign -f 4  "${TEMP}" "${DEST}"
}

function compress()
{
    DIR="${1}"
    FILE="${2}"
    if [ -f "${FILE}" ]; then
        rm -f "${FILE}"
    fi
    aapt p -F "${FILE}" "${DIR}"
}

function unzip_apk()
{
    FILE="${1}"
    DIR="${2}"
    if [ -d "${DIR}" ]; then
        rm -rf "${DIR}"
    fi
    unzip -q "${FILE}" -d "${DIR}"
}

function repack()
{
    SOURCE="${1}"
    TEMP_FILE="${2}"
    TEMP_DIR="${3}"
    #
    echo "BEFORE:$(ls -lbh "${SOURCE}")"
    #
    unzip_apk "${SOURCE}" "${TEMP_DIR}"
    #
    compress "${TEMP_DIR}" "${TEMP_FILE}"
    #
    zip_align "${TEMP_FILE}" "${SOURCE}"
    #
    echo "AFTER :$(ls -lbh "${SOURCE}")"
    #
    clear_temp "${TEMP_FILE}" "${TEMP_DIR}"
}

prepare()
{
    FILE_PATH="${1}"
    if [ ! -f "${FILE_PATH}" ]; then
        echo "NOT FILE"
        echo "Please in put a valid file"
        exit
    fi
    FILE_NAME=${FILE_PATH%.*}
    TEMP_DIR="this_is_a_temp_dir_${FILE_NAME}"
    TEMP_PATH="this_is_a_temp_dir_${FILE_NAME}.apk"
    rm -rf "${TEMP_DIR}"
}

clear_temp()
{

    TEMP_FILE="${1}"
    TEMP_DIR="${2}"
    if [ -f "${TEMP_FILE}" ]; then
        rm -f "${TEMP_FILE}"
    fi

    if [ -d "${TEMP_DIR}" ]; then
        rm -rf "${TEMP_DIR}"
    fi
}

##
prepare "${1}"
##
repack "${FILE_PATH}" "${TEMP_PATH}" "${TEMP_DIR}"