CN106325834A - Android installation package compression method and device - Google Patents
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- CN106325834A CN106325834A CN201510342068.2A CN201510342068A CN106325834A CN 106325834 A CN106325834 A CN 106325834A CN 201510342068 A CN201510342068 A CN 201510342068A CN 106325834 A CN106325834 A CN 106325834A
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Abstract
The embodiment of the invention discloses an Android installation package compression method and device, used for reducing the volume of an APK installation package, reducing the flow generated in a transmission process, saving network transmission flow resources, and reducing the cost. The method in the embodiment of the invention comprises the following steps of: determining a to-be-compressed file needing to be added into an APK file, compressing the to-be-compressed file by adopting a Deflate compression algorithm realized based on a 7Z function library, so that a compressed file is obtained, and synthesizing the compressed file and a file, which does not need to be compressed and needs to be added into the APK file, so that the APK file is generated.
Description
Technical field
The present invention relates to Android installation kit compression field, particularly relate to Android installation kit compression method and device.
Background technology
APK is the abbreviation of Android Package, i.e. Android installation kit.By APK file is direct
Pass to Android Android simulator or Android phone perform get final product set up applications.In order to improve
Efficiency of transmission, saves memory space, is typically necessary and is compressed some files in APK file,
Automatization's strapping tool in Android kit when the concrete file needing compression can be packed by APK
(android assert packaging tool, aapt) determines.
At present, APK is compressed by the general Deflate compression algorithm using ZLIB function library to realize,
Wherein, ZLIB is a compression algorithm function library increased income that Android acquiescence uses, and Deflate is one
Plant disc driver and disk (ZIP) the compression algorithm title of high storage density.
But, in actual applications, the APK installation kit using this ZLIB function library to obtain needs for
Taking bigger memory space, the flow produced in transmitting procedure can be caused relatively big, transmission cost is higher.
Summary of the invention
Embodiments provide Android installation kit compression method and device, be used for reducing APK installation kit
Volume, reduce the flow produced in transmitting procedure, save network traffic flow resource, reduce cost.
A kind of Android installation kit compression method, including:
At Android installation kit APK file generation phase, determine that needing to add treating in APK file to presses
Contracting file；
Use the Deflate compression algorithm realized based on 7Z function library, described file to be compressed is pressed
Contracting, obtains the file compressed；
Synthesize file that described compression completes and need the literary composition that need not compression adding in APK file
Part, generates APK file.
A kind of Android installation kit compression method, including:
Determining the compressed file in APK file and uncompressed file, described compressed file is for being used
The file that Deflate compression algorithm based on the realization of ZLIB function library is compressed, described uncompressed file is
The file not compressed in described APK file；
Compressed file described in decompression, and use the Deflate compression algorithm realized based on 7Z function library,
File after decompression is re-compressed, obtains the file that weight has contracted；
Synthesize the uncompressed file in the file and described APK file that described weight contracted, generate weight
APK file after contracting.
A kind of compressor, including:
First determines module, at APK file generation phase, determines and needs to add APK file to
In file to be compressed；
Compression module, for using the Deflate compression algorithm realized based on 7Z function library, to described the
One determines that the file to be compressed that module determines is compressed, and obtains the file compressed；
First generation module, for the file compressed by described compression module and APK to be added to
The file that need not compression in file, adds in APK file, generates APK file.
A kind of compressor, including:
Second determines module, for determining the compressed file in APK file and uncompressed file, described
Compressed file is to be used the file that Deflate compression algorithm based on the realization of ZLIB function library is compressed,
Described uncompressed file is the file not compressed in described APK file；
Weight compression module, determines, for decompressing described second, the compressed file that module determines, and uses base
In the Deflate compression algorithm that 7Z function library realizes, the file after decompression is re-compressed, obtains weight
The file contracted；
Second generation module, for synthesizing the file and described second that described heavy compression module weight has contracted
Determine the uncompressed file that module determines, generate the APK file after weight contracting.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that the embodiment of the present invention
In, the file to be compressed in APK file is used the Deflate compression algorithm realized based on 7Z function library
It is compressed, thus obtains compression ratio more than using the Deflate compression calculation realized based on ZLIB function library
The APK file of method compression, reduces the volume of APK installation kit, decreases generation in transmitting procedure
Flow, saves network traffic flow resource, reduces cost.
Accompanying drawing explanation
Fig. 1 is one schematic flow sheet of Android installation kit compression method in the embodiment of the present invention；
Fig. 2 is another schematic flow sheet of Android installation kit compression method in the embodiment of the present invention；
Fig. 3 is one structural representation of compressor in the embodiment of the present invention；
Fig. 4 is another structural representation of compressor in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those skilled in the art are not making wound
The every other embodiment obtained under the property made work premise, broadly falls into the scope of protection of the invention.
Embodiments provide Android installation kit compression method and device, be used for reducing APK installation kit
Volume, reduce the flow produced in transmitting procedure, save network traffic flow resource, reduce cost.
In the present invention, term " 7Z function library " is a compression algorithm function library increased income, and 7Z function library is
The function library used during 7Z compression, wherein 7Z can use multiple compression algorithm efficiently for a kind of main flow
Carry out the compressed format of data compression, owing to 7z has been disclosed structure editing function, so it can be supported
Any compression algorithm.
In the present invention, term " Deflate compression algorithm " is a kind of ZIP compression algorithm title, and Deflate is
It is simultaneously used a lossless data compression of LZ77 algorithm and Huffman encoding (Huffman Coding)
Algorithm.It is initially to be filed defined in the instrument second edition by the PKZIP that Phil Katz is him, fixed later
Justice is in RFC 1951 specification, and current APK kit is also general during generating gives tacit consent to use Deflate
Compression algorithm.
In the present invention, term " ZLIB function library " is the compression algorithm function that a Android acquiescence uses
Storehouse.
It should be noted that owing to Android bottom is based on linux system, linux system is extensively adopted
By ZLIB function library as compression storehouse, therefore, use ZLIB also given tacit consent to by the strapping tool of android system
Function library carries out the compression of file.And the present invention breaks through conventional thought and technology barriers, through repeatedly trying
Test, again use 7Z function library to carry out the compression of APK file, by the contrast of actual compression result,
So that the compression ratio of APK file improves 2% to 10%.
In actual applications, 7Z function library can be used to come APK literary composition in the different phase of APK file
Part is compressed: one is the generation phase in APK file, directly uses 7Z function library to APK literary composition
Part is compressed, and generates APK file；Another is to use ZLIB function library as compression storehouse
After obtaining APK file, then use 7Z function library again to the compressed file using ZLIB function library to obtain
Carry out weight contracting, obtain the APK file that weight has contracted.Separately below different embodiments to this two
The situation of kind is described:
One, at the generation phase of APK file:
Referring to Fig. 1, in the embodiment of the present invention, one embodiment of Android installation kit compression method includes:
101, at APK file generation phase, the literary composition to be compressed needing to add in APK file is determined
Part；
APK file comprises multiple file, in order to save memory space and the network traffic flow of APK,
The partial document added in APK file is compressed, and which file needs compression and Android
System reads relevant with running APK mechanism, determines that some file can not compress, otherwise exist during APK packing
Cannot cannot run after reading or installing during installation, other files then need compression.
In this step, at APK file generation phase, compressor determines to be needed to add APK file to
In compressed file.
Optionally, the automatization strapping tool aapt during compressor can use Android kit determines to be needed
File to be compressed in APK file to be added to；
Optionally, compressor can also read the listed files to be compressed of preset storage to determine that needs add
The file to be compressed being added in APK file.
Can be in the way of the determination file to be compressed having other, which kind of mode specifically chosen can be according to reality
Border situation determines, is not construed as limiting herein.
102, use the Deflate compression algorithm realized based on 7Z function library, described file to be compressed is entered
Row compression, obtains the file compressed；
After compressor determines file to be compressed, the Deflate compression realized based on 7Z function library is used to calculate
Method, is compressed this file to be compressed, obtains the file compressed.
It is understood that according to practical situations, file one by one can be compressed respectively, it is possible to
To compress multiple file simultaneously, it is not construed as limiting herein.
103, synthesize file that described compression completes and needing to add to APK file need not pressure
The file of contracting, generates APK file.
The Deflate compression algorithm that file to be compressed uses 7Z function library to realize has been compressed by compressor
After, synthesize the file compressed and need the file that need not compression adding in APK file,
Generate APK file.
It is understood that for the compression ratio reaching maximum as far as possible, determine for any one
APK, which file needs to add in APK file, the file needing to add in APK file which
Needing compression, which need not compression, all determines that.Concrete, can be determined by aapt instrument.
In the embodiment of the present invention, the file to be compressed in APK file is used based on 7Z letter by compressor
The Deflate compression algorithm that number storehouse realizes is compressed, thus obtains compression ratio more than using based on ZLIB
The APK file of the Deflate compression algorithm compression that function library realizes, reduces the volume of APK installation kit,
Decrease the flow produced in transmitting procedure, save network traffic flow resource, reduce cost.
In above example, use the Deflate compression algorithm realized based on 7Z function library, treat described
Compressed file is compressed, and in actual applications, can also select the value of multiple compression parameters during compression:
Based in the Deflate compression algorithm that 7Z function library realizes, the compression ratio affecting APK installation kit has
Following parameter:
1, compression level:
Compression level has 6 kinds, for { 0,1,3,5,7,9}, wherein 0 expression is not compressed, and 9 represent poles
Pressure limiting is contracted, and numeral is the biggest, and compression level is the highest.
2, NumFastBytes:
Representing the word size arranging Deflate encoder, digital scope is 3 to 258, for another shadow
Ringing the parameter of compression ratio, increase numeral, compression ratio slightly improves.
3, NumPasses:
Representing the transmission size arranging Deflate encoder, digital scope is 1 to 15, for another shadow
Ringing the parameter of compression ratio, increase numeral, compression ratio slightly improves；
As another embodiment of Android installation kit compression method in the embodiment of the present invention, in above example,
Use the Deflate compression algorithm realized based on 7Z function library, described file to be compressed be compressed,
Being specifically as follows, selecting compression level is 9, and NumFastBytes is in 128,195,256 or 258
Any one, NumPasses is 15, is compressed described file to be compressed.
It is understood that according to practical situations, above-mentioned parameter can also be taken during compression other values,
It is not construed as limiting herein.It should be noted that only calculate in the Deflate compression realized based on 7Z function library
Method there is NumFastBytes and NumPasses the two affect the parameter of compression ratio, based on ZLIB
The Deflate compression algorithm that function library realizes does not has.
In the embodiment of the present invention, by choosing the value of the parameter affecting compression ratio so that compression obtains
APK file volume is less, further decreases the flow produced in transmitting procedure, saves network and passes
Defeated floating resources, reduces cost.
For ease of understanding, with a concrete application scenarios, Android installation kit in the embodiment of the present invention is compressed below
Method is specifically described:
At APK file generation phase, compressor determines 10 literary compositions needing to add in APK file
Part there are 4 files can not compress, cannot run, then after may result in the APK installation of generation after compression
Determining that these 4 files are the file that need not compression, other 6 files are file to be compressed；
The Deflate compression algorithm that compressor employing realizes based on 7Z function library, selection compression level is
9, NumFastBytes is 258, and NumPasses is 15, compresses this 6 literary compositions to be compressed the most respectively
Part, obtains the file that 6 compressions complete；
The file these 6 compressions completed and 4 file packings that need not compression, then generate APK
File, the Deflate compression algorithm that this APK file realizes based on ZLIB function library relative to employing is carried out
The APK file of compression, compression ratio is less.
Two, after the generation of APK file:
Referring to Fig. 2, in the embodiment of the present invention, another embodiment of Android installation kit compression method includes:
201, the compressed file in APK file and uncompressed file are determined；
Wherein, described compressed file is to be used the Deflate compression realized based on ZLIB function library to calculate
The file that method is compressed, described uncompressed file is the file not compressed；
For the APK literary composition using the Deflate compression algorithm realized based on ZLIB function library to compress
Part, compressor determines the compressed file in this APK file and uncompressed file.
It is understood that in actual applications, compressor can each in this APK file
File, is successively read and determines whether for compressed file, be defined as after compressed file by this document voluntarily
Subsequent step, until having read all files in APK file；Compressor can also first determine this
Whole compressed files in APK file, then perform subsequent step, it is not construed as limiting herein.
202, compressed file described in decompression, and use the Deflate compression realized based on 7Z function library to calculate
Method, re-compresses the file after decompression, obtains the file that weight has contracted；
After compressor determines the compressed file in APK file, decompress this compressed file, and use
The Deflate compression algorithm realized based on 7Z function library, re-compresses the file after this decompression, obtains
The file that weight has contracted.
If during it is understood that decompress, being that file determines whether to have compressed, successively successively one by one
Decompress, then during weight contracting, can be to the file weight successively contracting after decompressing；If decompress,
Be first to determine whole compressed files, then decompress, then during weight contracting, can the most successively
Compression, it is also possible to multiple files compress together, are not construed as limiting herein.
203, file and described uncompressed file that described weight has contracted are synthesized, after generating weight contracting
APK file.
Compressor synthesizes file and the uncompressed file that weight has contracted, and generates the APK literary composition after weight contracting
Part.
In the embodiment of the present invention, the compressor APK file to having generated uses based on 7Z function library real
Existing Deflate compression algorithm re-compresses, and obtains the APK file that volume is less, reduces APK
The volume of installation kit, decreases the flow produced in transmitting procedure, saves network traffic flow resource,
Reduce cost.
In above example, use the Deflate compression algorithm realized based on 7Z function library, after decompression
File re-compress, in actual applications, the value of multiple compression parameters during compression, can also be selected:
Optionally, as another embodiment of Android installation kit compression method, Fig. 2 in the embodiment of the present invention
In illustrated embodiment: use the Deflate compression algorithm realized based on 7Z function library, to the literary composition after decompression
Part re-compresses, and specifically may include that and uses the Deflate compression algorithm realized based on 7Z function library,
Selecting compression level is 9, and NumFastBytes is any one in 128,195,256 or 258,
NumPasses is 15, re-compresses the file after decompression.
It is understood that according to practical situations, above-mentioned parameter can also be taken other during weight contracting
Value, is not construed as limiting herein.It should be noted that only in the Deflate pressure realized based on 7Z function library
Compression algorithm has NumFastBytes and NumPasses the two affect the parameter of compression ratio, based on
The Deflate compression algorithm that ZLIB function library realizes does not has.
In the embodiment of the present invention, by choosing the value of the parameter affecting compression ratio so that weight contracting obtains
APK file volume less, further decrease in transmitting procedure produce flow, save network
Delivery flow rate resource, reduces cost.
For ease of understanding, below with another concrete application scenarios to Android installation kit pressure in the embodiment of the present invention
Compression method is specifically described:
One uses the Deflate compression algorithm realized based on ZLIB function library to compress the APK file obtained
In, there are 7 compressed file and 3 uncompressed files；
Compressor reads one of them file by file default order, it is judged that whether this document is to press
Contracting file, if not compressed file, reads the next one by this default sequence；If compressed file,
Decompression this document, and use Deflate compression algorithm based on the realization of 7Z function library to decompressing the literary composition obtained
Part carries out weight contracting, and the file after weight being contracted adds in new APK file；
So circulation, until having read 10 whole files, finally gives employing based on 7Z function library
Realize Deflate compression algorithm weight contracting APK file, this APK file relative to use based on
The APK file that the Deflate compression algorithm that ZLIB function library realizes is compressed, compression ratio is less.
Below the compressor in the embodiment of the present invention is described, refers to Fig. 3, the embodiment of the present invention
One embodiment of middle compressor includes:
First determines module 301, at APK file generation phase, determines and needs to add APK literary composition to
File to be compressed in part；
Compression module 302, for using the Deflate compression algorithm realized based on 7Z function library, to described
First determines that the file to be compressed that module 301 determines is compressed, and obtains the file compressed；
First generation module 303, for synthesizing file that described compression module 302 compressed and to add
The file that need not compression being added in APK file, generates APK file.
In the embodiment of the present invention, the file to be compressed in APK file is used based on 7Z by compression module 302
The Deflate compression algorithm that function library realizes is compressed, thus obtains compression ratio more than using based on ZLIB
The APK file of the Deflate compression algorithm compression that function library realizes, reduces the volume of APK installation kit,
Decrease the flow produced in transmitting procedure, save network traffic flow resource, reduce cost.
Optionally, as another embodiment of compressor in the embodiment of the present invention, above-mentioned first determines mould
Block 301 specifically for, at APK file generation phase, use the automatization baler in Android kit
Tool aapt determines the described file to be compressed needing and adding in APK file.
In the embodiment of the present invention, aapt instrument is used to determine file to be compressed so that the result determined is more
Accurately, the process determined is more quick, improves the speed producing APK.
Optionally, as another embodiment of compressor in the embodiment of the present invention, above-mentioned compression module 302
Specifically for, use the Deflate compression algorithm realized based on 7Z function library, selecting compression level is 9,
NumFastBytes is any one in 128,195,256 or 258, and NumPasses is 15, to described
File to be compressed is compressed, and obtains the file compressed.
In the embodiment of the present invention, compression module 302, by choosing the value of the parameter affecting compression ratio, makes
The APK file volume obtained must be compressed less, further decrease the flow produced in transmitting procedure,
Save network traffic flow resource, reduce cost.
Referring to Fig. 4, in the embodiment of the present invention, another embodiment of compressor includes:
Second determines module 401, for determining the compressed file in APK file and uncompressed file,
Described compressed file be used based on ZLIB function library realize Deflate compression algorithm compressed
File, described uncompressed file is the file not compressed in described APK file；
Weight compression module 402, determines, for decompressing described second, the compressed file that module 401 determines, and
Use the Deflate compression algorithm realized based on 7Z function library, the file after decompression is re-compressed,
The file contracted to weight；
Second generation module 403, for synthesizing file and the institute that described heavy compression module 402 weight has contracted
State second and determine the uncompressed file that module 401 determines, generate the APK file after weight contracting.
In the embodiment of the present invention, the weight compression module 402 APK file to having generated uses based on 7Z letter
The Deflate compression algorithm that number storehouse realizes re-compresses, and obtains the APK file that volume is less, subtracts
The little volume of APK installation kit, decreases the flow produced in transmitting procedure, saves network transmission stream
Amount resource, reduces cost.
Optionally, as another embodiment of compressor in the embodiment of the present invention, above-mentioned heavy compression module
402 specifically for, decompress described second and determine the compressed file that module 401 determines, and use based on
The Deflate compression algorithm that 7Z function library realizes, selecting compression level is 9, NumFastBytes is 128,
195, in 256 or 258 any one, NumPasses is 15, re-compresses the file after decompression,
The file contracted to weight.
In the embodiment of the present invention, weight compression module 402 passes through to choose the value of the parameter affecting compression ratio,
The APK file volume that weight contracting is obtained is less, further decreases the stream produced in transmitting procedure
Amount, saves network traffic flow resource, reduces cost.
Those skilled in the art is it can be understood that arrive, and for convenience and simplicity of description, above-mentioned retouches
The specific works process of the system stated, device and unit, is referred to the correspondence in preceding method embodiment
Process, does not repeats them here.
In several embodiments provided herein, it should be understood that disclosed system, device and
Method, can realize by another way.Such as, device embodiment described above is only shown
Meaning property, such as, the division of described unit, be only a kind of logic function and divide, actual can when realizing
There to be other dividing mode, the most multiple unit or assembly can in conjunction with or be desirably integrated into another
System, or some features can ignore, or do not perform.Another point, shown or discussed each other
Coupling direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, device or unit
Or communication connection, can be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, makees
The parts shown for unit can be or may not be physical location, i.e. may be located at a place,
Or can also be distributed on multiple NE.Can select according to the actual needs part therein or
The whole unit of person realizes the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit
In, it is also possible to it is that unit is individually physically present, it is also possible to two or more unit are integrated in one
In individual unit.Above-mentioned integrated unit both can realize to use the form of hardware, it would however also be possible to employ software merit
The form of energy unit realizes.
If described integrated unit realizes and as independent production marketing using the form of SFU software functional unit
Or when using, can be stored in a computer read/write memory medium.Based on such understanding, this
The part that the most in other words prior art contributed of technical scheme of invention or this technical scheme
Completely or partially can embody with the form of software product, this computer software product is stored in one
In storage medium, including some instructions with so that computer equipment (can be personal computer,
Server, or the network equipment etc.) perform completely or partially walking of method described in each embodiment of the present invention
Suddenly.And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM,
Read-Only Memory), random access memory (RAM, Random Access Memory),
The various medium that can store program code such as magnetic disc or CD.
The above, above example only in order to technical scheme to be described, is not intended to limit；
Although being described in detail the present invention with reference to previous embodiment, those of ordinary skill in the art should
Work as understanding: the technical scheme described in foregoing embodiments still can be modified by it, or to it
Middle part technical characteristic carries out equivalent；And these amendments or replacement, do not make appropriate technical solution
Essence depart from various embodiments of the present invention technical scheme spirit and scope.
Claims (10)
1. an Android installation kit compression method, it is characterised in that including:
At Android installation kit APK file generation phase, determine that needing to add treating in APK file to presses
Contracting file；
Use the Deflate compression algorithm realized based on 7Z function library, described file to be compressed is pressed
Contracting, obtains the file compressed；
Synthesize file that described compression completes and need the literary composition that need not compression adding in APK file
Part, generates APK file.
Method the most according to claim 1, it is characterised in that described determine need to add APK to
File to be compressed in file, specifically includes:
The automatization strapping tool aapt in Android kit is used to determine that described needs adds APK file to
In file to be compressed.
Method the most according to claim 1 and 2, it is characterised in that described to described literary composition to be compressed
Part is compressed, and specifically includes:
Selecting compression level is 9, and word size NumFastBytes of encoder is 128,195,256
Or in 258 any one, transmission size NumPasses of encoder is 15, enters described file to be compressed
Row compression.
4. an Android installation kit compression method, it is characterised in that including:
Determining the compressed file in APK file and uncompressed file, described compressed file is for being used
The file that Deflate compression algorithm based on the realization of ZLIB function library is compressed, described uncompressed file is
The file not compressed in described APK file；
Compressed file described in decompression, and use the Deflate compression algorithm realized based on 7Z function library,
File after decompression is re-compressed, obtains the file that weight has contracted；
Synthesize the uncompressed file in the file and described APK file that described weight contracted, generate weight
APK file after contracting.
Method the most according to claim 4, it is characterised in that described to decompression after file again
Compression, specifically includes:
Selecting compression level is 9, and NumFastBytes is any one in 128,195,256 or 258,
NumPasses is 15, re-compresses the file after decompression.
6. a compressor, it is characterised in that including:
First determines module, at APK file generation phase, determines and needs to add APK file to
In file to be compressed；
Compression module, for using the Deflate compression algorithm realized based on 7Z function library, to described the
One determines that the file to be compressed that module determines is compressed, and obtains the file compressed；
First generation module, for the file compressed by described compression module and APK to be added to
The file that need not compression in file, adds in APK file, generates APK file.
Device the most according to claim 6, it is characterised in that described first determines that module is specifically used
In, at APK file generation phase, use the automatization strapping tool aapt in Android kit to determine institute
State the file to be compressed needing to add in APK file.
8. according to the device described in claim 6 or 7, it is characterised in that described compression module is specifically used
In, use the Deflate compression algorithm realized based on 7Z function library, selecting compression level is 9,
NumFastBytes is any one in 128,195,256 or 258, and NumPasses is 15, to described
File to be compressed is compressed, and obtains the file compressed.
9. a compressor, it is characterised in that including:
Second determines module, for determining the compressed file in APK file and uncompressed file, described
Compressed file is to be used the file that Deflate compression algorithm based on the realization of ZLIB function library is compressed,
Described uncompressed file is the file not compressed in described APK file；
Weight compression module, determines, for decompressing described second, the compressed file that module determines, and uses base
In the Deflate compression algorithm that 7Z function library realizes, the file after decompression is re-compressed, obtains weight
The file contracted；
Second generation module, for synthesizing the file and described second that described heavy compression module weight has contracted
Determine the uncompressed file that module determines, generate the APK file after weight contracting.
Device the most according to claim 9, it is characterised in that described heavy compression module is specifically used
In, decompress described second and determine the compressed file that module determines, and use based on the realization of 7Z function library
Deflate compression algorithm, selecting compression level is 9, and NumFastBytes is 128,195,256 or 258
In any one, NumPasses is 15, to decompression after file re-compress, obtain what weight had contracted
File.
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| CN201510342068.2A CN106325834A (en) | 2015-06-18 | 2015-06-18 | Android installation package compression method and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106775781A (en) * | 2017-02-17 | 2017-05-31 | 北京金山安全软件有限公司 | Method and device for reducing application installation packages and electronic equipment |
| CN111352634A (en) * | 2018-12-21 | 2020-06-30 | 北京字节跳动网络技术有限公司 | Installation package construction method, electronic device and storage medium |
| CN112765112A (en) * | 2021-01-22 | 2021-05-07 | 苏州浪潮智能科技有限公司 | Installation package packing and unpacking method |
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| CN112765112A (en) * | 2021-01-22 | 2021-05-07 | 苏州浪潮智能科技有限公司 | Installation package packing and unpacking method |
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