如何获取自己的 Android 应用程序的(私有)数据？

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最佳答案

adb backup will write an Android-specific archive:

adb backup  -f myAndroidBackup.ab  com.corp.appName

This archive can be converted to tar format using:

dd if=myAndroidBackup.ab bs=4K iflag=skip_bytes skip=24 | openssl zlib -d > myAndroidBackup.tar

Reference:

http://nelenkov.blogspot.ca/2012/06/unpacking-android-backups.html

Search for "Update" at that link.

Alternatively, use Android backup extractor to extract files from the Android backup (.ab) file.

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After setting the right permissions by adding the following code:

File myFile = ...;
myFile.setReadable(true, false); // readable, not only for the owner

adb pull works as desired.

see File.setReadable()

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You may use this shell script below. It is able to pull files from app cache as well, not like the adb backup tool:

#!/bin/sh


if [ -z "$1" ]; then
echo "Sorry script requires an argument for the file you want to pull."
exit 1
fi


adb shell "run-as com.corp.appName cat '/data/data/com.corp.appNamepp/$1' > '/sdcard/$1'"
adb pull "/sdcard/$1"
adb shell "rm '/sdcard/$1'"

Then you can use it like this:

./pull.sh files/myFile.txt
./pull.sh cache/someCachedData.txt

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I had the same problem but solved it running following:

$ adb shell
$ run-as {app-package-name}
$ cd /data/data/{app-package-name}
$ chmod 777 {file}
$ cp {file} /mnt/sdcard/

After this you can run

$ adb pull /mnt/sdcard/{file}

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Here is what worked for me:

adb -d shell "run-as com.example.test cat /data/data/com.example.test/databases/data.db" > data.db

I'm printing the database directly into local file.

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On MacOSX, by combining the answers from Calaf and Ollie Ford, the following worked for me.

On the command line (be sure adb is in your path, mine was at ~/Library/Android/sdk/platform-tools/adb) and with your android device plugged in and in USB debugging mode, run:

 adb backup -f backup com.mypackage.myapp

Your android device will ask you for permission to backup your data. Select "BACKUP MY DATA"

Wait a few moments.

The file backup will appear in the directory where you ran adb.

Now run:

dd if=backup bs=1 skip=24 | python -c "import zlib,sys;sys.stdout.write(zlib.decompress(sys.stdin.read()))" > backup.tar

Now you'll you have a backup.tar file you can untar like this:

 tar xvf backup.tar

And see all the files stored by your application.

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This answer is based on my experience with other answers, and comments in the answers. My hope is I can help someone in a similar situation.

I am doing this on OSX via terminal.

Previously Vinicius Avellar's answer worked great for me. I was only ever most of the time needing the database from the device from a debug application.

Today I had a use case where I needed multiple private files. I ended up with two solutions that worked good for this case.

Use the accepted answer along with Someone Somewhere's OSX specific comments. Create a backup and use the 3rd party solution, sourceforge.net/projects/adbextractor/files/?source=navbar to unpack into a tar. I'll write more about my experience with this solution at the bottom of this answer. Scroll down if this is what you are looking for.

A faster solution which I settled with. I created a script for pulling multiple files similar to Tamas' answer. I am able to do it this way because my app is a debug app and I have access to run-as on my device. If you don't have access to run-as this method won't work for you on OSX.

Here is my script for pulling multiple private files that I'll share with you, the reader, who is also investigating this awesome question ;) :

#!/bin/bash
#
# Strict mode: http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -euo pipefail
IFS=$'\n\t'


#
# Usage: script -f fileToPull -p packageName
#


# This script is for pulling private files from an Android device
# using run-as. Note: not all devices have run-as access, and
# application must be a debug version for run-as to work.
#
# If run-as is deactivated on your device use one of the
# alternative methods here:
# http://stackoverflow.com/questions/15558353/how-can-one-pull-the-private-data-of-ones-own-android-app
#
# If you have encrypted backup files use:
# sourceforge.net/projects/adbextractor/files/?source=navbar
# From comments in the accepted answer in the above SO question
#
# If your files aren't encrypted use the accepted answer
# ( see comments and other answers for OSX compatibility )
#
# This script is open to expansions to allow selecting
# device used. Currently first selected device from
# adb shell will be used.


#Check we have one connected device
adb devices -l | grep -e 'device\b' > /dev/null


if [ $? -gt 0 ]; then
echo "No device connected to adb."
exit 1
fi


# Set filename or directory to pull from device
# Set package name we will run as
while getopts f:p: opt; do
case $opt in
f)
fileToPull=$OPTARG
;;
p)
packageName=$OPTARG
;;
esac
done;


# Block file arg from being blank
if [ -z "$fileToPull" ]; then
echo "Please specify file or folder to pull with -f argument"
exit 1
fi


# Block package name arg from being blank
if [ -z "$packageName" ]; then
echo "Please specify package name to run as when pulling file"
exit 1
fi


# Check package exists
adb shell pm list packages | grep "$packageName" > /dev/null
if [ $? -gt 0 ]; then
echo "Package name $packageName does not exist on device"
exit 1
fi


# Check file exists and has permission with run-as
fileCheck=`adb shell "run-as $packageName ls $fileToPull"`
if [[ $fileCheck =~ "Permission denied" ]] || [[ $fileCheck =~ "No such file or directory" ]]; then
echo "Error: $fileCheck"
echo "With file -> $fileToPull"
exit 1
fi


# Function to pull private file
#
# param 1 = package name
# param 2 = file to pull
# param 3 = output file
function pull_private_file () {


mkdir -p `dirname $3`


echo -e "\033[0;35m***" >&2
echo -e "\033[0;36m Coping file $2 -> $3" >&2
echo -e "\033[0;35m***\033[0m" >&2


adb shell "run-as $1 cat $2" > $3
}


# Check if a file is a directory
#
# param 1 = directory to check
function is_file_dir() {


adb shell "if [ -d \"$1\" ]; then echo TRUE; fi"
}


# Check if a file is a symbolic link
#
# param 1 = directory to check
function is_file_symlink() {


adb shell "if [ -L \"$1\" ]; then echo TRUE; fi"
}


# recursively pull files from device connected to adb
#
# param 1 = package name
# param 2 = file to pull
# param 3 = output file
function recurse_pull_private_files() {


is_dir=`is_file_dir "$2"`
is_symlink=`is_file_symlink "$2"`


if [ -n "$is_dir" ]; then


files=`adb shell "run-as $1 ls \"$2\""`


# Handle the case where directory is a symbolic link
if [ -n "$is_symlink" ]; then
correctPath=`adb shell "run-as $1 ls -l \"$2\"" | sed 's/.*-> //' | tr -d '\r'`
files=`adb shell "run-as $1 ls \"$correctPath\""`
fi


for i in $files; do


# Android adds nasty carriage return that screws with bash vars
# This removes it. Otherwise weird behavior happens
fileName=`echo "$i" | tr -d '\r'`


nextFile="$2/$fileName"
nextOutput="$3/$fileName"
recurse_pull_private_files "$1" "$nextFile" "$nextOutput"
done
else


pull_private_file "$1" "$2" "$3"
fi
}


recurse_pull_private_files "$packageName" "$fileToPull" "`basename "$fileToPull"`"

Gist: https://gist.github.com/davethomas11/6c88f92c6221ffe6bc26de7335107dd4

Back to method 1, decrypting a backup using Android Backup Extractor

Here are the steps I took on my Mac, and issues I came across:

First I queued up a backup ( and set a password to encrypt my backup, my device required it ):

adb backup -f myAndroidBackup.ab  com.corp.appName

Second I downloaded just abe.jar from here: https://sourceforge.net/projects/adbextractor/files/abe.jar/download

Next I ran:

java -jar ./abe.jar unpack myAndroidBackup.ab myAndroidBackup.tar

At this point I got an error message. Because my archive is encrypted, java gave me an error that I needed to install some security policy libraries.

So I went to http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html and downloaded the security policy jars I needed. Now in my case the install instructions told me the wrong location to put the jar files. It says that the proper location is <java-home>/lib/security. I put them there first and still got the error message. So I investigated and on my Mac with Java 1.8 the correct place to put them was: <java-home>/jre/lib/security. I made sure to backup the original policy jars, and put them there. Vola I was able to enter a password with abe.jar and decrypt to a tar file.

Lastly I just ran ( after running previous command again )

tar xvf myAndroidBackup.tar

Now it is important to note that if you can just run-as and cat, it is much much faster. One, you only get the files you want and not the entire application. Two, the more files ( + encryption for me ) makes it slower to transfer. So knowing to do this way is important if you don't have run-as on OSX, but the script should be first goto for a debug application.

Mind you I just wrote it today and tested it a few times, so please notify me of any bugs!

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Starting form Dave Thomas script I've been able to write my own solution to overcome 2 problems:

my backup was containing only the manifest file
binary files got with Dave Thomas where unreadable

This is my script, that copies app data to sdcard and then pull it

#Check we have one connected device
adb devices -l | grep -e 'device\b' > /dev/null


if [ $? -gt 0 ]; then
echo "No device connected to adb."
exit 1
fi


# Set filename or directory to pull from device
# Set package name we will run as
while getopts f:p: opt; do
case $opt in
f)
fileToPull=$OPTARG
;;
p)
packageName=$OPTARG
;;
esac
done;


# Block package name arg from being blank
if [ -z "$packageName" ]; then
echo "Please specify package name to run as when pulling file"
exit 1
fi


# Check package exists
adb shell pm list packages | grep "$packageName" > /dev/null
if [ $? -gt 0 ]; then
echo "Package name $packageName does not exist on device"
exit 1
fi


adb shell "run-as $packageName cp -r /data/data/$packageName/ /sdcard/$packageName"
adb pull /sdcard/$packageName
adb shell rm -rf /sdcard/$packageName

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Backed up Game data with apk. Nougat Oneplus 2.

**adb backup "-apk com.nekki.shadowfight" -f "c:\myapk\samsung2.ab"**

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Similar to Tamas's answer, here is a one-liner for Mac OS X to fetch all of the files for app with your.app.id from your device and save them to (in this case) ~/Desktop/your.app.id:

(
id=your.app.id &&
dest=~/Desktop &&
adb shell "run-as $id cp -r /data/data/$id /sdcard" &&
adb -d pull "/sdcard/$id" "$dest" &&
if [ -n "$id" ]; then adb shell "rm -rf /sdcard/$id"; fi
)

Exclude the -d to pull from emulator
Doesn't stomp your session variables
You can paste the whole block into Terminal.app (or remove newlines if desired)

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Does that mean that one could chmod the directory from world:--x to world:r-x long enough to be able to fetch the files?

Yes, exactly. Weirdly enough, you also need the file to have the x bit set. (at least on Android 2.3)

chmod 755 all the way down worked to copy a file (but you should revert permissions afterwards, if you plan to continue using the device).

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If you are using a Mac machine and a Samsung phone, this is what you have to do (since run-as doesn't work on Samsung and zlib doesn't work on Mac)

Take a backup of your app's data directory adb backup -f /Users/username/Desktop/data.ab com.example
You will be asked for a password to encrypt in your Phone, don't enter any. Just tap on "Back up my data". See How to take BackUp?
Once successfully backed up, you will see data.ab file in your Desktop. Now we need to convert this to tar format.
Use Android Backup Extractor for this. Download | SourceCode
Download it and you will see abe.jar file. Add this to your PATH variable.
Execute this to generate the tar file: java -jar abe.jar unpack /Users/username/Desktop/data.ab /Users/username/Desktop/data.tar
Extract the data.tar file to access all the files

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you can do:

adb pull /storage/emulated/0/Android/data//

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Newer versions of Android Studio include the Device File Explorer which I've found to be a handy GUI method of downloading files from my development Nexus 7.

You Must make sure you have enabled USB Debugging on the device

Click View > Tool Windows > Device File Explorer or click the Device File Explorer button in the tool window bar to open the Device File Explorer.
Select a device from the drop down list.
Interact with the device content in the file explorer window. Right-click on a file or directory to create a new file or directory, save the selected file or directory to your machine, upload, delete, or synchronize. Double-click a file to open it in Android Studio.

Android Studio saves files you open this way in a temporary directory outside of your project. If you make modifications to a file you opened using the Device File Explorer, and would like to save your changes back to the device, you must manually upload the modified version of the file to the device.

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