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Google Play requires that the compressed APK that users download be no more than 100MB. For most apps, this is plenty of space for all the app's code and assets. However, some apps need more space for high-fidelity graphics, media files, or other large assets. Previously, if your app's compressed download size exceeded 100MB, you had to host and download the additional resources yourself when the user opens the app. Hosting and serving the extra files can be costly, and the user experience is often less than ideal. To make this process easier for you and more pleasant for users, Google Play allows you to attach two large expansion files that supplement your APK.
Google Play hosts the expansion files for your app and serves them to the device atno cost to you. The expansion files are saved to the device's shared storage location (theSD card or USB-mountable partition; also known as the 'external' storage) where your app can accessthem. On most devices, Google Play downloads the expansion file(s) at the same time itdownloads the APK, so your app has everything it needs when the user opens it for thefirst time. In some cases, however, your app must download the files from Google Playwhen your app starts.
If you'd like to avoid using expansion files and your app's compressed download size is larger than 100 MB, you should instead upload your app using Android App Bundles which allows for up to a 150 MB compressed download size. Additionally, because using app bundles defers APK generation and signing to Google Play, users download optimized APKs with only the code and resources they need to run your app. You don't have to build, sign, and manage multiple APKs or expansion files, and users get smaller, more optimized downloads.
Overview
Each time you upload an APK using the Google Play Console, you have the option toadd one or two expansion files to the APK. Each file can be up to 2GB and it can be any format youchoose, but we recommend you use a compressed file to conserve bandwidth during the download.Conceptually, each expansion file plays a different role:
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- The main expansion file is theprimary expansion file for additional resources required by your app.
- The patch expansion file is optional and intended for small updates to themain expansion file.
While you can use the two expansion files any way you wish, we recommend that the mainexpansion file deliver the primary assets and should rarely if ever updated; the patch expansionfile should be smaller and serve as a “patch carrier,” getting updated with each majorrelease or as necessary.
However, even if your app update requires only a new patch expansion file, you still mustupload a new APK with an updated versionCode
in the manifest. (ThePlay Console does not allow you to upload an expansion file to an existing APK.)
Note: The patch expansion file is semantically the same as themain expansion file—you can use each file any way you want.
File name format
Each expansion file you upload can be any format you choose (ZIP, PDF, MP4, etc.). You can alsouse the JOBB tool to encapsulate and encrypt a setof resource files and subsequent patches for that set. Regardless of the file type, Google Playconsiders them opaque binary blobs and renames the files using the following scheme:
There are three components to this scheme:
main
or patch
<expansion-version>
android:versionCode
value). 'First' is emphasized because although the Play Console allows you tore-use an uploaded expansion file with a new APK, the expansion file's name does not change—itretains the version applied to it when you first uploaded the file.
<package-name>
For example, suppose your APK version is 314159 and your package name is com.example.app. If youupload a main expansion file, the file is renamed to:
Storage location
When Google Play downloads your expansion files to a device, it saves them to the system'sshared storage location. To ensure proper behavior, you must not delete, move, or rename theexpansion files. In the event that your app must perform the download from Google Playitself, you must save the files to the exact same location.
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The getObbDir()
method returns the specific locationfor your expansion files in the following form:
<shared-storage>
is the path to the shared storage space, available fromgetExternalStorageDirectory()
.<package-name>
is your app's Java-style package name, availablefromgetPackageName()
.
For each app, there are never more than two expansion files in this directory.One is the main expansion file and the other is the patch expansion file (if necessary). Previousversions are overwritten when you update your app with new expansion files. Since Android4.4 (API level 19), apps can read OBB
expansion files without external storagepermission. However, some implementations of Android 6.0 (API level 23) and later still require permission, so you will need to declare the READ_EXTERNAL_STORAGE
permission in the app manifest and ask for permission at runtime as follows:
For Android version 6 and later, external storage permission needs to be requested at runtime. However, some implementations of Android do not require permission to read OBB files. The following code snippet shows how to check for read access before asking for external storage permission:
If you must unpack the contents of your expansion files, do not delete theOBB
expansion files afterwards and do not save the unpacked datain the same directory. You should save your unpacked files in the directoryspecified by getExternalFilesDir()
. However,if possible, it's best if you use an expansion file format that allows you to read directly fromthe file instead of requiring you to unpack the data. For example, we've provided a libraryproject called the APK Expansion Zip Library that reads your data directlyfrom the ZIP file.
Caution: Unlike APK files, any files savedon the shared storage can be read by the user and other apps.
Tip: If you're packaging media files into a ZIP, you can use mediaplayback calls on the files with offset and length controls (such as MediaPlayer.setDataSource()
andSoundPool.load()
) without theneed to unpack your ZIP. In order for this to work, you must not perform additional compression onthe media files when creating the ZIP packages. For example, when using the zip
tool,you should use the -n
option to specify the file suffixes that should not becompressed: zip -n .mp4;.ogg main_expansion media_files
Download process
Most of the time, Google Play downloads and saves your expansion files at the same time itdownloads the APK to the device. However, in some cases Google Playcannot download the expansion files or the user might have deleted previously downloaded expansionfiles. To handle these situations, your app must be able to download the filesitself when the main activity starts, using a URL provided by Google Play.
The download process from a high level looks like this:
- User selects to install your app from Google Play.
- If Google Play is able to download the expansion files (which is the case for mostdevices), it downloads them along with the APK.
If Google Play is unable to download the expansion files, it downloads theAPK only.
- When the user launches your app, your app must check whether the expansion files arealready saved on the device.
- If yes, your app is ready to go.
- If no, your app must download the expansion files over HTTP from Google Play. Your appmust send a request to the Google Play client using the Google Play's app Licensing service, whichresponds with the name, file size, and URL for each expansion file. With this information, you thendownload the files and save them to the proper storage location.
Caution: It is critical that you include the necessary code todownload the expansion files from Google Play in the event that the files are not already on thedevice when your app starts. As discussed in the following section about Downloading the Expansion Files, we've made a library available to you thatgreatly simplifies this process and performs the download from a service with a minimal amount ofcode from you.
Development checklist
Here's a summary of the tasks you should perform to use expansion files with yourapp:
- First determine whether your app's compressed download size needs to be more than 100MB.Space is precious and you should keep your total download size as small as possible. If your appuses more than 100MB in order to provide multiple versions of your graphic assets for multiple screendensities, consider instead publishing multiple APKs in which each APKcontains only the assets required for the screens that it targets. For the best results whenpublishing to Google Play, upload an Android App Bundle, whichincludes all your app’s compiled code and resources, but defers APK generation and signing to GooglePlay.
- Determine which app resources to separate from your APK and package them in afile to use as the main expansion file.
Normally, you should only use the second patch expansion file when performing updates tothe main expansion file. However, if your resources exceed the 2GB limit for the mainexpansion file, you can use the patch file for the rest of your assets.
- Develop your app such that it uses the resources from your expansion files in thedevice's shared storage location.
Remember that you must not delete, move, or rename the expansion files.
If your app doesn't demand a specific format, we suggest you create ZIP files foryour expansion files, then read them using the APK Expansion ZipLibrary.
- Add logic to your app's main activity that checks whether the expansion filesare on the device upon start-up. If the files are not on the device, use Google Play's app Licensing service to request URLsfor the expansion files, then download and save them.
To greatly reduce the amount of code you must write and ensure a good user experienceduring the download, we recommend you use the DownloaderLibrary to implement your download behavior.
If you build your own download service instead of using the library, be aware that youmust not change the name of the expansion files and must save them to the properstorage location.
Once you've finished your app development, follow the guide to TestingYour Expansion Files.
Rules and Limitations
Adding APK expansion files is a feature available when you upload your app using thePlay Console. When uploading your app for the first time or updating anapp that uses expansion files, you must be aware of the following rules and limitations:
- Each expansion file can be no more than 2GB.
- In order to download your expansion files from Google Play, the user must haveacquired your app from Google Play. Google Play will notprovide the URLs for your expansion files if the app was installed by other means.
- When performing the download from within your app, the URL that Google Playprovides for each file is unique for every download and each one expires shortly after it is givento your app.
- If you update your app with a new APK or upload multiple APKs for the sameapp, you can select expansion files that you've uploaded for a previous APK. Theexpansion file's name does not change—it retains the version received by the APK towhich the file was originally associated.
- If you use expansion files in combination with multiple APKs in order toprovide different expansion files for different devices, you still must upload separate APKsfor each device in order to provide a unique
versionCode
value and declare different filters foreach APK. - You cannot issue an update to your app by changing the expansion filesalone—you must upload a new APK to update your app. If your changes onlyconcern the assets in your expansion files, you can update your APK simply by changing the
versionCode
(andperhaps also theversionName
). - Do not save other data into your
obb/
directory. If you must unpack some data, save it into the location specified bygetExternalFilesDir()
. - Do not delete or rename the
.obb
expansion file (unless you'reperforming an update). Doing so will cause Google Play (or your app itself) to repeatedlydownload the expansion file. - When updating an expansion file manually, you must delete the previous expansion file.
Downloading the Expansion Files
In most cases, Google Play downloads and saves your expansion files to the device at the sametime it installs or updates the APK. This way, the expansion files are available when yourapp launches for the first time. However, in some cases your app must download theexpansion files itself by requesting them from a URL provided to you in a responsefrom Google Play's app Licensing service.
The basic logic you need to download your expansion files is the following:
- When your app starts, look for the expansion files on the shared storage location (in the
Android/obb/<package-name>/
directory).- If the expansion files are there, you're all set and your app can continue.
- If the expansion files are not there:
- Perform a request using Google Play's app Licensing to get yourapp's expansion file names, sizes, and URLs.
- Use the URLs provided by Google Play to download the expansion files and savethe expansion files. You must save the files to the shared storage location(
Android/obb/<package-name>/
) and use the exact file name providedby Google Play's response.Note: The URL that Google Play provides for yourexpansion files is unique for every download and each one expires shortly after it is given toyour app.
If your app is free (not a paid app), then you probably haven't used the app Licensing service. It's primarilydesigned for you to enforcelicensing policies for your app and ensure that the user has the right touse your app (he or she rightfully paid for it on Google Play). In order to facilitate theexpansion file functionality, the licensing service has been enhanced to provide a responseto your app that includes the URL of your app's expansion files that are hostedon Google Play. So, even if your app is free for users, you need to include theLicense Verification Library (LVL) to use APK expansion files. Of course, if your appis free, you don't need to enforce license verification—you simply need thelibrary to perform the request that returns the URL of your expansion files.
Note: Whether your app is free or not, Google Playreturns the expansion file URLs only if the user acquired your app from Google Play.
In addition to the LVL, you need a set of code that downloads the expansion filesover an HTTP connection and saves them to the proper location on the device's shared storage.As you build this procedure into your app, there are several issues you should take intoconsideration:
- The device might not have enough space for the expansion files, so you should checkbefore beginning the download and warn the user if there's not enough space.
- File downloads should occur in a background service in order to avoid blocking the userinteraction and allow the user to leave your app while the download completes.
- A variety of errors might occur during the request and download that you mustgracefully handle.
- Network connectivity can change during the download, so you should handle such changes andif interrupted, resume the download when possible.
- While the download occurs in the background, you should provide a notification thatindicates the download progress, notifies the user when it's done, and takes the user back toyour app when selected.
To simplify this work for you, we've built the Downloader Library,which requests the expansion file URLs through the licensing service, downloads the expansion files,performs all of the tasks listed above, and even allows your activity to pause and resume thedownload. By adding the Downloader Library and a few code hooks to your app, almost all thework to download the expansion files is already coded for you. As such, in order to provide the bestuser experience with minimal effort on your behalf, we recommend you use the Downloader Library todownload your expansion files. The information in the following sections explain how to integratethe library into your app.
If you'd rather develop your own solution to download the expansion files using the GooglePlay URLs, you must follow the appLicensing documentation to perform a license request, then retrieve the expansion file names,sizes, and URLs from the response extras. You should use the APKExpansionPolicy
class (included in the License Verification Library) as your licensingpolicy, which captures the expansion file names, sizes, and URLs from the licensing service.
About the Downloader Library
To use APK expansion files with your app and provide the best user experience withminimal effort on your behalf, we recommend you use the Downloader Library that's included in theGoogle Play APK Expansion Library package. This library downloads your expansion files in abackground service, shows a user notification with the download status, handles networkconnectivity loss, resumes the download when possible, and more.
To implement expansion file downloads using the Downloader Library, all you need to do is:
- Extend a special
Service
subclass andBroadcastReceiver
subclass that each require just a fewlines of code from you. - Add some logic to your main activity that checks whether the expansion files havealready been downloaded and, if not, invokes the download process and displays aprogress UI.
- Implement a callback interface with a few methods in your main activity thatreceives updates about the download progress.
The following sections explain how to set up your app using the Downloader Library.
Preparing to use the Downloader Library
To use the Downloader Library, you need todownload two packages from the SDK Manager and add the appropriate libraries to yourapp.
First, open the Android SDK Manager(Tools > SDK Manager), and underAppearance & Behavior > System Settings > Android SDK, selectthe SDK Tools tab to select and download:
- Google Play Licensing Library package
- Google Play APK Expansion Library package
Create a new library module for the License Verification Library and DownloaderLibrary. For each library:
- Select File > New > New Module.
- In the Create New Module window, select Android Library,and then select Next.
- Specify an app/Library name such as 'Google Play License Library'and 'Google Play Downloader Library', choose Minimum SDK level, then selectFinish.
- Select File > Project Structure.
- Select the Properties tab and in LibraryRepository, enter the library from the
<sdk>/extras/google/
directory(play_licensing/
for the License Verification Library orplay_apk_expansion/downloader_library/
for the Downloader Library). - Select OK to create the new module.
Note: The Downloader Library depends on the LicenseVerification Library. Be sure to add the LicenseVerification Library to the Downloader Library's project properties.
Or, from a command line, update your project to include the libraries:
- Change directories to the
<sdk>/tools/
directory. - Execute
android update project
with the--library
option to add both theLVL and the Downloader Library to your project. For example:
With both the License Verification Library and Downloader Library added to yourapp, you'll be able to quickly integrate the ability to download expansion files fromGoogle Play. The format that you choose for the expansion files and how you read themfrom the shared storage is a separate implementation that you should consider based on yourapp needs.
Tip: The Apk Expansion package includes a sampleappthat shows how to use the Downloader Library in an app. The sample uses a third libraryavailable in the Apk Expansion package called the APK Expansion Zip Library. Ifyou plan onusing ZIP files for your expansion files, we suggest you also add the APK Expansion Zip Library toyour app. For more information, see the section belowabout Using the APK Expansion Zip Library.
Declaring user permissions
In order to download the expansion files, the Downloader Libraryrequires several permissions that you must declare in your app's manifest file. Theyare:
Note: By default, the Downloader Library requires APIlevel 4, but the APK Expansion Zip Library requires API level 5.
Implementing the downloader service
In order to perform downloads in the background, the Downloader Library provides itsown Service
subclass called DownloaderService
that you should extend. Inaddition to downloading the expansion files for you, the DownloaderService
also:
- Registers a
BroadcastReceiver
that listens for changes to thedevice's network connectivity (theCONNECTIVITY_ACTION
broadcast) in order to pause the download when necessary (such as due to connectivity loss) andresume the download when possible (connectivity is acquired). - Schedules an
RTC_WAKEUP
alarm to retry the download forcases in which the service gets killed. - Builds a custom
Notification
that displays the download progress andany errors or state changes. - Allows your app to manually pause and resume the download.
- Verifies that the shared storage is mounted and available, that the files don't already exist,and that there is enough space, all before downloading the expansion files. Then notifies the userif any of these are not true.
All you need to do is create a class in your app that extends the DownloaderService
class and override three methods to provide specific app details:
getPublicKey()
- This must return a string that is the Base64-encoded RSA public key for your publisheraccount, available from the profile page on the Play Console (see Setting Up for Licensing).
getSALT()
- This must return an array of random bytes that the licensing
Policy
uses tocreate anObfuscator
. The salt ensures that your obfuscatedSharedPreferences
file in which your licensing data is saved will be unique and non-discoverable. getAlarmReceiverClassName()
- This must return the class name of the
BroadcastReceiver
inyour app that should receive the alarm indicating that the download should berestarted (which might happen if the downloader service unexpectedly stops).
For example, here's a complete implementation of DownloaderService
:
Notice: You must update the BASE64_PUBLIC_KEY
valueto be the public key belonging to your publisher account. You can find the key in the DeveloperConsole under your profile information. This is necessary even when testingyour downloads.
Remember to declare the service in your manifest file:
Implementing the alarm receiver
In order to monitor the progress of the file downloads and restart the download if necessary, theDownloaderService
schedules an RTC_WAKEUP
alarm thatdelivers an Intent
to a BroadcastReceiver
in yourapp. You must define the BroadcastReceiver
to call an APIfrom the Downloader Library that checks the status of the download and restartsit if necessary.
You simply need to override the onReceive()
method to call DownloaderClientMarshaller.startDownloadServiceIfRequired()
.
For example:
Notice that this is the class for which you must return the namein your service's getAlarmReceiverClassName()
method (see the previous section).
Remember to declare the receiver in your manifest file:
Starting the download
The main activity in your app (the one started by your launcher icon) isresponsible for verifying whether the expansion files are already on the device and initiatingthe download if they are not.
Starting the download using the Downloader Library requires the followingprocedures:
- Check whether the files have been downloaded.
The Downloader Library includes some APIs in the
Helper
class tohelp with this process:getExpansionAPKFileName(Context, c, boolean mainFile, intversionCode)
doesFileExist(Context c, String fileName, long fileSize)
For example, the sample app provided in the Apk Expansion package calls thefollowing method in the activity's
onCreate()
method to checkwhether the expansion files already exist on the device:In this case, each
XAPKFile
object holds the version number and file size of a knownexpansion file and a boolean as to whether it's the main expansion file. (See the sampleapp'sSampleDownloaderActivity
class for details.)If this method returns false, then the app must begin the download.
- Start the download by calling the static method
DownloaderClientMarshaller.startDownloadServiceIfRequired(Context c, PendingIntentnotificationClient, Class<?> serviceClass)
.The method takes the following parameters:
context
: Your app'sContext
.notificationClient
: APendingIntent
to start your mainactivity. This is used in theNotification
that theDownloaderService
creates to show the download progress. When the user selects the notification, the systeminvokes thePendingIntent
you supply here and should open the activitythat shows the download progress (usually the same activity that started the download).serviceClass
: TheClass
object for your implementation ofDownloaderService
, required to start the service and begin the download if necessary.
The method returns an integer that indicateswhether or not the download is required. Possible values are:
NO_DOWNLOAD_REQUIRED
: Returned if the files alreadyexist or a download is already in progress.LVL_CHECK_REQUIRED
: Returned if a license verification isrequired in order to acquire the expansion file URLs.DOWNLOAD_REQUIRED
: Returned if the expansion file URLs are already known,but have not been downloaded.
The behavior for
LVL_CHECK_REQUIRED
andDOWNLOAD_REQUIRED
are essentially thesame and you normally don't need to be concerned about them. In your main activity that callsstartDownloadServiceIfRequired()
, you can simply check whether or not the response isNO_DOWNLOAD_REQUIRED
. If the response is anything other thanNO_DOWNLOAD_REQUIRED
,the Downloader Library begins the download and you should update your activity UI todisplay the download progress (see the next step). If the response isNO_DOWNLOAD_REQUIRED
, then the files are available and your app can start.For example:
- When the
startDownloadServiceIfRequired()
method returns anything otherthanNO_DOWNLOAD_REQUIRED
, create an instance ofIStub
bycallingDownloaderClientMarshaller.CreateStub(IDownloaderClient client, Class<?>downloaderService)
. TheIStub
provides a binding between your activity to the downloaderservice such that your activity receives callbacks about the download progress.In order to instantiate your
IStub
by callingCreateStub()
, you must pass itan implementation of theIDownloaderClient
interface and yourDownloaderService
implementation. The next section about Receiving download progress discussestheIDownloaderClient
interface, which you should usually implement in yourActivity
class so you can update the activity UI when the download state changes.We recommend that you call
CreateStub()
to instantiate yourIStub
during your activity'sonCreate()
method, afterstartDownloadServiceIfRequired()
starts the download.For example, in the previous code sample for
onCreate()
, you can respond to thestartDownloadServiceIfRequired()
result like this:After the
onCreate()
method returns, your activityreceives a call toonResume()
, which is where you should thencallconnect()
on theIStub
, passing it your app'sContext
. Conversely, you should calldisconnect()
in your activity'sonStop()
callback.Calling
connect()
on theIStub
binds your activity to theDownloaderService
such that your activity receives callbacks regarding changes to the downloadstate through theIDownloaderClient
interface.
Receiving download progress
To receive updates regarding the download progress and to interact with the DownloaderService
, you must implement the Downloader Library's IDownloaderClient
interface.Usually, the activity you use to start the download should implement this interface in order todisplay the download progress and send requests to the service.
The required interface methods for IDownloaderClient
are:
onServiceConnected(Messenger m)
IStub
in your activity, you'll receive a call to thismethod, which passes a Messenger
object that's connected with your instanceof DownloaderService
. To send requests to the service, such as to pause and resumedownloads, you must call DownloaderServiceMarshaller.CreateProxy()
to receive the IDownloaderService
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interface connected to the service.A recommended implementation looks like this:
With the IDownloaderService
object initialized, you can send commands to thedownloader service, such as to pause and resume the download (requestPauseDownload()
and requestContinueDownload()
).
onDownloadStateChanged(int newState)
The newState
value will be one of several possible values specified inby one of the IDownloaderClient
class's STATE_*
constants.
To provide a useful message to your users, you can request a corresponding stringfor each state by calling Helpers.getDownloaderStringResourceIDFromState()
. Thisreturns the resource ID for one of the strings bundled with the DownloaderLibrary. For example, the string 'Download paused because you are roaming' corresponds to STATE_PAUSED_ROAMING
.
onDownloadProgress(DownloadProgressInfo progress)
DownloadProgressInfo
object,which describes various information about the download progress, including estimated time remaining,current speed, overall progress, and total so you can update the download progress UI.Tip: For examples of these callbacks that update the downloadprogress UI, see the SampleDownloaderActivity
in the sample app provided with theApk Expansion package.
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Some public methods for the IDownloaderService
interface you might find useful are:
requestPauseDownload()
- Pauses the download.
requestContinueDownload()
- Resumes a paused download.
setDownloadFlags(int flags)
- Sets user preferences for network types on which its OK to download the files. Thecurrent implementation supports one flag,
FLAGS_DOWNLOAD_OVER_CELLULAR
, but you can addothers. By default, this flag is not enabled, so the user must be on Wi-Fi to downloadexpansion files. You might want to provide a user preference to enable downloads overthe cellular network. In which case, you can call:
Using APKExpansionPolicy
If you decide to build your own downloader service instead of using the Google PlayDownloader Library, you should still use the APKExpansionPolicy
that's provided in the License Verification Library. The APKExpansionPolicy
class is nearly identical to ServerManagedPolicy
(available in theGoogle Play License Verification Library) but includes additional handling for the APK expansionfile response extras.
Note: If you do use the Downloader Library as discussed in the previous section, thelibrary performs all interaction with the APKExpansionPolicy
so you don't have to usethis class directly.
The class includes methods to help you get the necessary information about the availableexpansion files:
getExpansionURLCount()
getExpansionURL(int index)
getExpansionFileName(int index)
getExpansionFileSize(int index)
For more information about how to use the APKExpansionPolicy
when you're notusing the Downloader Library, see the documentation for Adding Licensing to Your App,which explains how to implement a license policy such as this one.
Reading the Expansion File
Once your APK expansion files are saved on the device, how you read your filesdepends on the type of file you've used. As discussed in the overview, yourexpansion files can be any kind of file youwant, but are renamed using a particular file name format and are saved to<shared-storage>/Android/obb/<package-name>/
.
Regardless of how you read your files, you should always first check that the externalstorage is available for reading. There's a chance that the user has the storage mounted to acomputer over USB or has actually removed the SD card.
Note: When your app starts, you should always check whetherthe external storage space is available and readable by calling getExternalStorageState()
. This returns one of several possible stringsthat represent the state of the external storage. In order for it to be readable by yourapp, the return value must be MEDIA_MOUNTED
.
Getting the file names
As described in the overview, your APK expansion files are savedusing a specific file name format:
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To get the location and names of your expansion files, you should use thegetExternalStorageDirectory()
and getPackageName()
methods to construct the path to your files.
Here's a method you can use in your app to get an array containing the complete pathto both your expansion files:
You can call this method by passing it your app Context
and the desired expansion file's version.
There are many ways you could determine the expansion file version number. One simple way is tosave the version in a SharedPreferences
file when the download begins, byquerying the expansion file name with the APKExpansionPolicy
class's getExpansionFileName(int index)
method. You can then get the version code by reading the SharedPreferences
file when you want to access the expansionfile.
For more information about reading from the shared storage, see the Data Storagedocumentation.
Using the APK Expansion Zip Library
The Google Market Apk Expansion package includes a library called the APKExpansion Zip Library (located in <sdk>/extras/google/google_market_apk_expansion/zip_file/
). This is an optional library thathelps you read your expansionfiles when they're saved as ZIP files. Using this library allows you to easily read resources fromyour ZIP expansion files as a virtual file system.
The APK Expansion Zip Library includes the following classes and APIs:
APKExpansionSupport
- Provides some methods to access expansion file names and ZIP files:
getAPKExpansionFiles()
- The same method shown above that returns the complete file path to both expansionfiles.
getAPKExpansionZipFile(Context ctx, int mainVersion, intpatchVersion)
- Returns a
ZipResourceFile
representing the sum of both the main file andpatch file. That is, if you specify both themainVersion
and thepatchVersion
, this returns aZipResourceFile
that provides read access toall the data, with the patch file's data merged on top of the main file.
ZipResourceFile
- Represents a ZIP file on the shared storage and performs all the work to provide a virtualfile system based on your ZIP files. You can get an instance using
APKExpansionSupport.getAPKExpansionZipFile()
or with theZipResourceFile
by passing it thepath to your expansion file. This class includes a variety of useful methods, but you generallydon't need to access most of them. A couple of important methods are:getInputStream(String assetPath)
- Provides an
InputStream
to read a file within the ZIP file. TheassetPath
must be the path to the desired file, relative tothe root of the ZIP file contents. getAssetFileDescriptor(String assetPath)
- Provides an
AssetFileDescriptor
for a file within theZIP file. TheassetPath
must be the path to the desired file, relative tothe root of the ZIP file contents. This is useful for certain Android APIs that require anAssetFileDescriptor
, such as someMediaPlayer
APIs.
APEZProvider
- Most apps don't need to use this class. This class defines a
ContentProvider
that marshals the data from the ZIP files through a contentproviderUri
in order to provide file access for certain Android APIs thatexpectUri
access to media files. For example, this is useful if you want toplay a video withVideoView.setVideoURI()
.
Skipping ZIP compression of media files
If you're using your expansion files to store media files, a ZIP file still allows you touse Android media playback calls that provide offset and length controls (such as MediaPlayer.setDataSource()
andSoundPool.load()
). In order forthis to work, you must not perform additional compression on the media files when creating the ZIPpackages. For example, when using the zip
tool, you should use the -n
option to specify the file suffixes that should not be compressed:
zip -n .mp4;.ogg main_expansion media_files
Reading from a ZIP file
When using the APK Expansion Zip Library, reading a file from your ZIP usually requires thefollowing:
The above code provides access to any file that exists in either your main expansion file orpatch expansion file, by reading from a merged map of all the files from both files. All youneed to provide the getAPKExpansionFile()
method is your app android.content.Context
and the version number for both the main expansion file and patchexpansion file.
If you'd rather read from a specific expansion file, you can use the ZipResourceFile
constructor with the path to the desired expansion file:
For more information about using this library for your expansion files, look atthe sample app's SampleDownloaderActivity
class, which includes additional code toverify the downloaded files using CRC. Beware that if you use this sample as the basis foryour own implementation, it requires that you declare the byte size of your expansionfiles in the xAPKS
array.
Testing Your Expansion Files
Before publishing your app, there are two things you should test: Reading theexpansion files and downloading the files.
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Testing file reads
Before you upload your app to Google Play, youshould test your app's ability to read the files from the shared storage. All you need to dois add the files to the appropriate location on the device shared storage and launch yourapp:
- On your device, create the appropriate directory on the shared storage where GooglePlay will save your files.
For example, if your package name is
com.example.android
, you need to createthe directoryAndroid/obb/com.example.android/
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- Manually add the expansion files to that directory. Be sure that you rename your files tomatch the file name format that Google Play will use.
For example, regardless of the file type, the main expansion file for the
com.example.android
app should bemain.0300110.com.example.android.obb
.The version code can be whatever value you want. Just remember:- The main expansion file always starts with
main
and the patch file starts withpatch
. - The package name always matches that of the APK to which the file is attached onGoogle Play.
- The main expansion file always starts with
- Now that the expansion file(s) are on the device, you can install and run your app totest your expansion file(s).
Here are some reminders about handling the expansion files:
- Do not delete or rename the
.obb
expansion files (even if you unpackthe data to a different location). Doing so will cause Google Play (or your app itself) torepeatedly download the expansion file. - Do not save other data into your
obb/
directory. If you must unpack some data, save it into the location specified bygetExternalFilesDir()
.
Testing file downloads
Because your app must sometimes manually download the expansion files when it firstopens, it's important that you test this process to be sure your app can successfully queryfor the URLs, download the files, and save them to the device.
To test your app's implementation of the manual download procedure,you can publish it to the internal test track, so it's only available toauthorized testers. If everything works as expected, your app shouldbegin downloading the expansion files as soon as the main activity starts.
Note: Previously you could test an app byuploading an unpublished 'draft' version. This functionality is no longersupported. Instead, you must publish it to an internal, closed, or open testingtrack. For more information, seeDraft Apps are NoLonger Supported.
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Updating Your app
One of the great benefits to using expansion files on Google Play is the ability toupdate your app without re-downloading all of the original assets. Because Google Playallows you to provide two expansion files with each APK, you can use the second file as a 'patch'that provides updates and new assets. Doing so avoids theneed to re-download the main expansion file which could be large and expensive for users.
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The patch expansion file is technically the same as the main expansion file and neitherthe Android system nor Google Play perform actual patching between your main and patch expansionfiles. Your app code must perform any necessary patches itself.
If you use ZIP files as your expansion files, the APK Expansion ZipLibrary that's included with the Apk Expansion package includes the ability to mergeyourpatch file with the main expansion file.
Note: Even if you only need to make changes to the patchexpansion file, you must still update the APK in order for Google Play to perform an update.If you don't require code changes in the app, you should simply update the versionCode
in themanifest.
As long as you don't change the main expansion file that's associated with the APKin the Play Console, users who previously installed your app will notdownload the main expansion file. Existing users receive only the updated APK and the new patchexpansion file (retaining the previous main expansion file).
Here are a few issues to keep in mind regarding updates to expansion files:
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- There can be only two expansion files for your app at a time. One main expansionfile and one patch expansion file. During an update to a file, Google Play deletes theprevious version (and so must your app when performing manual updates).
- When adding a patch expansion file, the Android system does not actually patch yourapp or main expansion file. You must design your app to support the patch data.However, the Apk Expansion package includes a library for using ZIP filesas expansion files, which merges the data from the patch file into the main expansion file soyou can easily read all the expansion file data.