CN109218799B - Method, storage medium, device and system for quickly switching high-definition images of android television - Google Patents
Method, storage medium, device and system for quickly switching high-definition images of android television Download PDFInfo
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- CN109218799B CN109218799B CN201710528368.9A CN201710528368A CN109218799B CN 109218799 B CN109218799 B CN 109218799B CN 201710528368 A CN201710528368 A CN 201710528368A CN 109218799 B CN109218799 B CN 109218799B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
- H04N21/23106—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8146—Monomedia components thereof involving graphical data, e.g. 3D object, 2D graphics
- H04N21/8153—Monomedia components thereof involving graphical data, e.g. 3D object, 2D graphics comprising still images, e.g. texture, background image
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- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Graphics (AREA)
- Memory System Of A Hierarchy Structure (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
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Abstract
The invention discloses a method, a storage medium, equipment and a system for quickly switching a high-definition picture of an android television, which relate to the application field of the android television, and comprise the following steps: and loading the picture from the server by using the picture loading frame, and caching the picture byte codes in the local cache directory. And calculating and setting the cache capacity of the memory cache, and caching the picture byte stream in the memory cache. The picture loading frame parses the picture byte stream in the memory and generates a bitmap file. And caching the bitmap file in the memory by utilizing the cache container. And switching the current visual picture to the adjacent bitmap file, and directly reading the adjacent bitmap file by the ImageView to finish the switching. The method and the device can realize the quick loading of the high-definition images in the field of android televisions.
Description
Technical Field
The invention relates to the application field of android televisions, in particular to a method, a storage medium, equipment and a system for quickly switching a high-definition image of an android television.
Background
Ergonomics has shown that the frequency of key-press clicking by fingers of normal people is 0.02s (20ms) at the fastest, and if the signal transmission and processing are added, the Delay of more than 5ms is generated, which means that the page response Delay time cannot exceed 25ms in the App interaction process, and the 25ms is MRD (Minimum response Delay).
MRD requires that the delay of image switching in the actual App interaction process should not exceed 25ms, if a frame rate of 60ms is added, the minimum time consumption of the whole image switching should not exceed 85ms, and in the App development process, because a Bitmap (Bitmap) occupies a high memory, the loading time of the Bitmap is more time-consuming than that of characters, which also causes the phenomenon of "displaying characters first and then displaying pictures" often occurring in the existing App. Currently, the following points are mostly solved:
(1) the original size of the picture is compressed, and the time consumed by loading and analyzing the picture byte stream is reduced, but the picture quality is reduced in the mode;
(2) the method uses a new picture coding and decoding format, such as a WebP format, which reduces the size of a picture on the premise of ensuring the picture quality, but the WebP is proposed by Google, is not popularized in a large area at present, and is unstable in reliability;
(3) the method comprises the steps of compressing original byte codes in the local caching process of the picture by using a picture loading frame, and decoding and quality recovery of Bitmap after the original byte codes are loaded into a memory, wherein the method is the mainstream method for quickly loading the large picture at present. Among the more well-known picture loading frames are Google official Glide, Facebook Fresco, etc., where Glide is good at rolling batch smooth loading of large numbers of pictures and Fresco is good at resource optimization.
In the android television field, because the man-machine interaction mode is carried out by depending on a remote controller, the high-definition image can not be quickly loaded in a sliding controllable mode by depending on a touch mode like a mobile phone end, the high definition of the mobile phone is quick and progressive, the threshold value control can be carried out on the pressing-in of the image byte codes, but the television end is not, and the high-definition image quick loading in the android television field can not be met by adopting the three modes.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for quickly switching high-definition pictures of an android television, which can realize quick loading of the high-definition pictures in the field of the android television.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a method for quickly switching a high-definition image of an android television comprises the following steps:
s1, loading a picture from a server by using a picture loading frame, and caching a picture byte code in a local cache directory;
s2, calculating and setting the cache capacity of the memory cache, and caching the picture byte stream in the memory cache;
s3, the picture loading frame analyzes the picture byte stream in the memory and generates a bitmap file;
s4, caching the bitmap file in the memory by using a cache container; and
s5, switching the current visual picture to the adjacent bitmap file, and directly reading the adjacent bitmap file by the ImageView to complete the switching.
On the basis of the above technical solution, the step S1 further includes a step of preventing picture rolling-back switching from causing picture reloading, which specifically includes the following steps:
after the pictures are loaded from the server by using the picture loading frame, generating a loading mark for each picture;
when the picture needs to be loaded again, reading the url of the loaded picture, constructing a Request for loading the server picture, and calculating a hash value of the Request;
traversing the image byte codes under the local cache directory, and reading a mark set in a preference file corresponding to the cached image byte codes;
and performing linear detection on the mark set by using a Hash search algorithm, if the picture byte codes are matched with the Hash value of the loaded picture Request, directly reading the picture byte codes stored in the corresponding local cache, and if the matched picture byte codes are not available, accessing the server to load the database picture resources.
On the basis of the above technical solution, the step S5 further includes a step of preventing abnormal display of the picture region caused by a failure in switching pictures, which specifically includes the following steps:
a pre-cache mechanism is added, a timer is arranged in the pre-cache, and timing time is set;
releasing the key event;
reading the cache in the cache container by the ImageView, judging whether the bitmap file is cached in the cache container after timing is finished, if so, returning the cached bitmap file to the ImageView, if not, truncating the key event, and performing cache retry until the bitmap file is cached in the cache container, and reading the bitmap file in the cache container again by the ImageView.
On the basis of the technical scheme, the picture loading frame is Glide.
On the basis of the technical scheme, the cache capacity of the memory cache is calculated according to the LRU algorithm, and the calculation formula is as follows:
CLRU＝Core*2+1 (1)
if Count < CLRU, ELRU ═ Count; if Count > CLRU, ELRU ═ CLRU;
wherein ELRU is the secondary cache dynamic capacity, Core is the device CPU Core number, CLRU is the cache capacity recommended by the LRU algorithm, Count is the picture switching Count value, which represents the maximum switching number of picture switching in the non-round mode.
Based on the above technical solution, in step S4, the Bitmap adjacent to the current picture is cached in the memory by using ArrayDeque as a cache container.
The invention also provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the above-mentioned method.
The invention also provides a device comprising a memory, a processor and a computer program stored on the memory and running on the processor, the processor implementing the steps of the above method when executing the computer program.
The invention also provides a system for quickly switching the high-definition images of the android television, which can realize the quick loading of the high-definition images in the field of the android television.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a system for quickly switching high definition pictures of an android television comprises:
the loading module is used for loading the pictures from the server and caching the byte codes of the pictures in a local cache directory;
the computing module is used for computing and setting the cache capacity of the memory cache, and caching the picture byte stream in the memory cache;
the analysis module is used for analyzing the picture byte stream in the memory to generate a bitmap file; and
and the cache container is used for caching the bitmap file in the memory.
On the basis of the technical scheme, the loading module is a Glide picture loading frame, and the cache container is ArrayDeque.
Compared with the prior art, the invention has the advantages that:
(1) compared with the conventional high-definition picture switching scheme which relies on a picture loading frame, the method for quickly switching the high-definition pictures of the android television provided by the invention marks the first-level cache on the basis of the picture loading frame, prevents pictures from being repeatedly loaded from a server, and effectively accelerates the reading of the first-level cache.
(2) The capacity setting of the secondary cache uses the picture switching count value to carry out calculation and dynamic setting, and compared with the conventional method which relies on the fixed value set by the CPU core number, the establishment of the secondary cache is more efficient and reasonable.
(3) Before the ImageView reads the bitmap file, the picture byte stream is analyzed in advance to generate the bitmap file, so that when the subsequent ImageView reads the bitmap file, the process of analyzing the picture byte stream does not need to be waited, and the loading switching speed of the picture is accelerated.
(4) A Cache Retry mechanism is adopted, so that the problem of abnormal display of a picture area caused by failure in picture switching is solved.
Drawings
Fig. 1 is a flowchart of a method for quickly switching a high definition image of an android television in an embodiment of the present invention;
fig. 2 is a block diagram of device connections in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a method for quickly switching a high definition map of an android television, where the method includes the following steps:
s1, loading the picture from the server by using a picture loading frame, and caching the picture byte codes in a local cache directory.
The picture local cache refers to a picture first-level cache, in this embodiment, the picture loading frame is Glide, the Glide is used to load the server picture and then cached in the local cache directory, and the essence of the first-level cache is the picture byte code, that is, the picture byte code is stored in the local cache directory in a picture byte code file manner.
In order to prevent the problem of repeated loading of pictures caused by picture rollback switching, in the process of loading the pictures by using Glide, a Tag needs to be loaded on each picture, and then when the picture is rolled back each time, if the same url picture needs to be loaded again, the cache is directly read, and the method specifically comprises the following steps:
after the pictures are loaded from the server by using the picture loading frame, generating a loading mark for each picture;
when the picture needs to be loaded again, reading the url of the loaded picture, constructing a Request for loading the server picture, and calculating a hash value of the Request;
and traversing the image byte codes in the local cache directory, and reading a mark set in the preference file corresponding to the cached image byte codes. The preference file in this embodiment is also a SharedPreferences file, which is a lightweight data storage manner, and the essence of the preference file is to store key-value key value pair data based on an XML file, and is usually used to store some simple configuration information.
And performing linear detection on the mark set by using a Hash search algorithm, if the picture byte codes are matched with the Hash value of the loaded picture Request, directly reading the picture byte codes stored in the corresponding local cache, and if the matched picture byte codes are not available, accessing the server to load the database picture resources.
Compared with the conventional switching scheme of the high-definition pictures, the switching scheme of the high-definition pictures depends on the picture loading frame, tag marking is carried out on the first-level cache on the basis of the picture loading frame, pictures are prevented from being repeatedly loaded from the server, and reading of the first-level cache is effectively accelerated.
And S2, calculating and setting the cache capacity of the memory cache, and caching the picture byte stream in the memory cache.
The picture memory Cache is a second-level Cache, and in this embodiment, an LRU (Least Recently Used) algorithm is Used to construct the second-level memory Cache of the picture, which is a page replacement algorithm for Disk Cache memory management.
The essence of the secondary cache is the picture byte stream bytelnputstream. In this embodiment, dynamic capacity setting is used when the cache capacity of the memory cache is constructed, instead of depending on the calculation rule of the device CPU core number. If the switching Count value Count of the picture is smaller than the CLRU in the picture loading process, the Count is taken as the cache capacity, and if the Count is larger than the CLRU, the CLRU is taken as the cache capacity, and the calculation formula is as follows:
CLRU＝Core*2+1 (1)
if Count < CLRU, ELRU ═ Count; if Count > CLRU, ELRU ═ CLRU;
wherein ELRU is the secondary cache dynamic capacity, Core is the device CPU Core number, CLRU is the cache capacity recommended by the LRU algorithm, Count is the picture switching Count value, which represents the maximum switching number of picture switching in the non-round mode.
Since the capacity setting of the second-level cache of the picture in the embodiment uses the picture switching count value to perform calculation and dynamic setting, compared with the conventional method that relies on the fixed value set by the core number of the CPU, the establishment of the second-level cache is more efficient and reasonable.
And S3, the picture loading frame analyzes the picture byte stream in the memory and generates a bitmap file.
Since the second-level cache is a memory cache, the generation of the picture can be delayed when the picture byte stream is analyzed in the memory cache, and in this embodiment, the picture byte stream is analyzed in advance and the bitmap file is generated before the bitmap file is read by the ImageView, so that when the bitmap file is read by the subsequent ImageView, the process of analyzing the picture byte stream does not need to be waited, and the loading switching speed of the picture is increased.
And S4, caching the bitmap file in the memory by using a cache container.
The buffer container in this embodiment is ArrayDeque, and a third-level critical buffer is established by using the ArrayDeque on the basis of a second-level buffer, where the third-level buffer is a critical buffer of the picture above and below or left and right of the current visible picture, and the third-level critical buffer is a bitmap file generated after parsing, and is intended to further implement fast switching of the picture through the bitmap file generated by the parsed picture byte stream.
The ArrayDeque set is an implementation class of a Deque interface, and is an array-based double-ended queue. The general Queue data structure can only add elements at the tail, and take elements at the head, but ArrayDeque can add or delete elements in both head and tail directions, because picture switching involves switching back, the three-level cache is required to be capable of performing element operations at the head and tail, and thus ArrayDeque is very suitable for rapid add-delete and read operations of elements in both head and tail directions.
Specifically, in this embodiment, the size of the array deque serving as the cache container is 3. When the head element is operated, the tail element is deleted firstly, the position of the tail element is vacated, and then the cache container can quickly fill a new element from the second-level cache to the tail; if the tail element is accessed, the head element is deleted, and then a new element is read from the secondary cache and filled into the head rapidly, wherein the element refers to the generated bitmap file.
S5, switching the current visual picture to the adjacent bitmap file, and directly reading the adjacent bitmap file by the ImageView to complete the switching.
When the left and right keys or up and down keys of the remote controller are pressed, the current visible picture is switched to the picture adjacent to the current visible picture, namely, the critical picture is loaded. Because the time for fast switching is limited within 80ms, if a critical Cache is not cached in time or the Cache is not emptied in time, a problem that the loading of the critical picture is unsuccessful occurs, therefore, this embodiment adopts a mechanism of pre-caching to handle the problem, the pre-caching can be internally provided with a timer of 80ms, after the timer is completed, if the critical Cache does not complete the element caching, the Cache Retry is performed, the key event is truncated, and the picture is continuously switched when the element caching is successful, which includes the following specific steps:
a pre-cache mechanism is added, a timer is arranged in the pre-cache, and timing time is set;
releasing a key event DispatcKeyEvent;
reading the cache in the cache container by the ImageView, judging whether the bitmap file is cached in the cache container after timing is finished, if so, returning the cached bitmap file to the ImageView, if not, truncating the key event, and performing cache retry until the bitmap file is cached in the cache container, and reading the bitmap file in the cache container again by the ImageView.
The process of the DispatcKeyEvent directly affects the process of switching the subsequent pictures, and if the DispatcKeyEvent is intercepted, the key operation is invalid, so that the pictures cannot be switched normally.
In summary, compared with the conventional switching scheme of the high-definition picture, the embodiment of the invention depends on the picture loading frame, and tag marking is performed on the first-level cache on the basis of the picture loading frame, so that the picture is prevented from being repeatedly loaded from the server, and the reading of the first-level cache is effectively accelerated. The capacity setting of the secondary cache uses the picture switching count value to carry out calculation and dynamic setting, and compared with the conventional method which relies on the fixed value set by the CPU core number, the establishment of the secondary cache is more efficient and reasonable. Before the ImageView reads the bitmap file, the picture byte stream is analyzed in advance to generate the bitmap file, so that when the subsequent ImageView reads the bitmap file, the process of analyzing the picture byte stream does not need to be waited, and the loading switching speed of the picture is accelerated. A Cache Retry mechanism is adopted, so that the problem of abnormal display of a picture area caused by failure in picture switching is solved.
Corresponding to the method for quickly switching high definition pictures of the android television, an embodiment of the present invention further provides a storage medium, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the method for quickly switching high definition pictures of the android television in the embodiment may be implemented. The storage medium includes various media capable of storing program codes, such as a usb disk, a portable hard disk, a ROM (Read-Only Memory), a RAM (Random Access Memory), a magnetic disk, or an optical disk.
In addition, referring to fig. 2, corresponding to the method for quickly switching high definition pictures of an android television, an embodiment of the present invention further provides a device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the computer program, so as to implement the steps of the method for quickly switching high definition pictures of an android television in the embodiment.
The embodiment of the invention also provides a system for quickly switching the high-definition images of the android television, which comprises a loading module, a computing module, an analysis module and a cache container.
The loading module is used for loading the pictures from the server and caching the byte codes of the pictures in a local cache directory. The loading module in this embodiment is a Glide picture loading frame.
The calculation module is used for calculating and setting the cache capacity of the memory cache, and caching the picture byte stream in the memory cache.
The analysis module is used for analyzing the picture byte stream in the memory to generate a bitmap file.
The cache container is used for caching the bitmap file in the memory, and the cache container in this embodiment is ArrayDeque.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (9)
1. A method for quickly switching a high-definition image of an android television is characterized by comprising the following steps:
s1, loading a picture from a server by using a picture loading frame, and caching a picture byte code in a local cache directory;
s2, calculating and setting the cache capacity of the memory cache, and caching the picture byte stream in the memory cache;
s3, the picture loading frame analyzes the picture byte stream in the memory and generates a bitmap file;
s4, caching the bitmap file in the memory by using a cache container; and
s5, switching the current visual picture to a bitmap file adjacent to the current visual picture, and directly reading the adjacent bitmap file by the ImageView to complete switching;
and when the picture area display abnormality caused by picture switching failure is prevented:
a pre-cache mechanism is added, a timer is arranged in the pre-cache, and timing time is set;
releasing the key event;
reading the cache in the cache container by the ImageView, judging whether the bitmap file is cached in the cache container after timing is finished, if so, returning the cached bitmap file to the ImageView, if not, truncating the key event, and performing cache retry until the bitmap file is cached in the cache container, and reading the bitmap file in the cache container again by the ImageView.
2. The method for rapidly switching the high definition map of the android television of claim 1, wherein: the step S1 further includes a step of preventing picture rolling back switching from causing picture reloading, which specifically includes the following steps:
after the pictures are loaded from the server by using the picture loading frame, generating a loading mark for each picture;
when the picture needs to be loaded again, reading the url of the loaded picture, constructing a Request for loading the server picture, and calculating a hash value of the Request;
traversing the image byte codes under the local cache directory, and reading a mark set in a preference file corresponding to the cached image byte codes;
and performing linear detection on the mark set by using a Hash search algorithm, if the picture byte codes are matched with the Hash value of the loaded picture Request, directly reading the picture byte codes stored in the corresponding local cache, and if the matched picture byte codes are not available, accessing the server to load the database picture resources.
3. The method for rapidly switching the high definition map of the android television of claim 1, wherein: the picture loading frame is Glide.
4. The method for rapidly switching the high definition map of the android television of claim 1, wherein the cache capacity of the memory cache is calculated according to an LRU algorithm, and the calculation formula is as follows:
CLRU＝Core*2+1 (1)
if Count < CLRU, ELRU ═ Count; if Count > CLRU, ELRU ═ CLRU;
wherein ELRU is the secondary cache dynamic capacity, Core is the device CPU Core number, CLRU is the cache capacity recommended by the LRU algorithm, Count is the picture switching Count value, which represents the maximum switching number of picture switching in the non-round mode.
5. The method for rapidly switching the high definition map of the android television of claim 1, wherein: in step S4, the Bitmap adjacent to the current picture is cached in the memory using ArrayDeque as a cache container.
6. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program when executed by a processor implements the steps of the method of any of the preceding claims 1 to 5.
7. An apparatus comprising a memory, a processor, and a computer program stored on the memory and executed on the processor, wherein: the processor, when executing the computer program, realizes the steps of the method of any of the preceding claims 1 to 5.
8. A system for realizing the method for quickly switching the high-definition pictures of the android television in the claim 1 is characterized by comprising the following steps:
the loading module is used for loading the pictures from the server and caching the byte codes of the pictures in a local cache directory;
the computing module is used for computing and setting the cache capacity of the memory cache, and caching the picture byte stream in the memory cache;
the analysis module is used for analyzing the picture byte stream in the memory to generate a bitmap file; and
a cache container for caching bitmap files in memory
9. The system for rapidly switching the high definition map of the android television of claim 8, wherein: the loading module is a Glide picture loading frame, and the cache container is ArrayDeque.
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| CN111857481A (en) | 2020-07-24 | 2020-10-30 | 京东方科技集团股份有限公司 | Image display method, apparatus and storage medium |
| CN112153449A (en) * | 2020-08-19 | 2020-12-29 | 视联动力信息技术股份有限公司 | Screen protection file display method and device, terminal equipment and storage medium |
| CN114416258A (en) * | 2022-01-20 | 2022-04-29 | 四川长虹电器股份有限公司 | Method for optimizing Android picture loading efficiency |
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