CN112363723A - Method for dynamically combining android layout - Google Patents
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Abstract
The invention relates to a method for dynamically combining android layout, which comprises the following steps: the method comprises the steps of initializing a layout manager, initializing a custom Adapter List Adapter, obtaining configuration data of a RecycleView List from a server, converting the configuration data into List data List viewInfo after analysis, transmitting the viewInfo to the custom Adapter, calling a refreshing method, triggering a subsequent rendering flow, creating and rendering a single List item, and realizing final layout of the RecycleView through GridLayoutManager after creation and rendering of the List item are completed. The application provides a self-defined Adapter for the Android list component RecyclerView, so that the Adapter becomes a list container capable of accommodating display units with different functions and different styles. The configuration data of the server side is read, the functional components are combined together, and the display styles of the functional components are adjusted during rendering, so that different display effects are presented flexibly, and the dynamic list container is realized.
Description
Technical Field
The invention relates to the technical field of network televisions, in particular to a method for dynamically combining android layouts.
Background
The IPTV, also called interactive network television, is a new media service operated by the cooperation of an operator and a broadcasting control platform, and provides telephone, broadband and television services for users through optical fibers. Besides live channels, IPTV also provides rich interactive information services such as on-demand, content review, topic, application, community, and life. At present, IPTV is increasingly regarded by users as a big trend of being non-blocking as a new digital media of a new showing form of television.
Android is a mobile operating system released by Google in 2008, 12 and 23 days, and is mainly used on mobile phones and tablets. Currently, the Android system has been developed for over a decade, and a total of 11 large system versions, called the operating systems most popular worldwide, are introduced. The live broadcast on-demand application of the IPTV is a network set top box environment based on an Android system.
The list component RecycleView released by the Android official is a new list implementation mode after ListView, and compared with ListView, RecycleView has obvious advantages in the aspects of cache processing, layout optimization, performance optimization and the like, but can not flexibly display layouts with different functions and different styles.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a method for dynamically combining android layouts, which flexibly presents different presentation effects by reading configuration data of a server, combining functional components together and adjusting the presentation styles of the functional components during rendering, namely, a dynamic list container is realized.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for dynamically combining android layouts uses a RecyclerView list and sets a grid layout manager GridLayoutManager for the list, and can realize grid containers in the same style. The scheme of the invention is expanded on the basis, and the user-defined Adapter is used for realizing that the list items can have containers with different widths, heights and different functions, and the scheme specifically comprises the following steps:
initializing a layout manager, setting the number of grids and the longitudinal layout direction, and horizontally dividing the list into 48 parts;
initializing a self-defined Adapter list Adapter, rewriting getItemCount, getItemType, onCreateViewHolder, onBindViewHolder by the Adapter, setting GridLayoutManager. SpansSizeLooppap for GridLayoutManager, and rewriting getSpanSize method therein;
acquiring configuration data of a RecyclerView List from a server, converting the configuration data into a List data List viewInfo after analysis, transmitting the viewInfo to a custom Adapter and calling a refreshing method to trigger a subsequent rendering process, wherein each item of the viewInfo corresponds to information required by a List item display;
the method comprises the steps that a rendering process is executed by Android RecycleView, firstly, a getItemCount method of a custom Adapter is called to obtain a total list item, and the custom Adapter returns the number of elements contained in a list of viewInfo at the moment, namely the number of list items in an absolute list of configuration items;
creating and rendering a single list item;
after the list items are created and rendered, the RecyclerView can realize the final layout through GridLayoutManager.
Specifically, the configuration of a RecyclerView list corresponds to a data list set viewInfo, each item of the data list corresponds to a presentation item of the RecyclerView, each item of the data list comprises layout data and content data, and the layout data comprises the width span count, the height, the function type viewType and the name layout name of a list item layout file of the RecyclerView in the presentation item.
Specifically, the width spanCount is a two-bit positive integer, and the width proportion of the list item is determined according to the proportion of the value in the grid number span of the reclerview.
Specifically, the height is a pixel value at a fixed resolution 1280 × 720, and a specific pixel value in the current resolution environment can be obtained through calculation, for example, the current resolution is 1920 × 1080, and then the height obtained through calculation is height × 1.5.
Specifically, the functions that the list items can have include a video playing frame, a picture text display frame, a picture carousel frame, a special-shaped picture frame, a nested list frame and the like, the function type viewType is represented by a six-bit positive integer, the first two bits from the high position to the low position represent the function of the list item, the third four bits represent the row where the list item is located in the list, the fifth six bits represent the column where the list item is located in the list, and each list item in the same list has a unique viewType value.
Specifically, the layout name of the list item layout file is the name of the layout resource file of the application where the layout resource file is located, and the Id of the layout object of the layout in the application can be obtained through the layout name.
Specifically, the content data includes information required for displaying the list item, and the content data is a text title and a picture address according to different function types of the list item, for example, when the type is a picture text display box; when the video is played, the content data is a playing address; when the pictures are in the carousel frame, the content data is the addresses of a group of pictures.
Specifically, the rewriting getSpanSize method obtains the current viewInfo from the viewInfo according to the position index, and returns the spanCount information of the viewInfo.
Specifically, the process of creating a single list item specifically includes:
s01, obtaining the type of the current list item
The method comprises the steps that an Android RecycleView circularly executes a process of creating and rendering a single list item for n times according to a value n of getItemCount, wherein a getViewType is called first to obtain the type of a current list item, a getViewType method is rewritten by a custom Adapter, and the viewType information in a configuration item is returned;
s02, creating ViewHolder corresponding to the current list item
Calling an onCreateViewHolder method of the custom Adapter by the RecycleView of the Android, creating a ViewHolder corresponding to the current list item, and transmitting the viewType acquired in the step S01 to the onCreateViewHolder method as an access parameter;
s03, judging whether the list item is the configuration information required by the list item currently rendered
The custom Adapter traverses the obtained configuration information viewinfo, wherein each piece of configuration information includes a viewType field, and the viewType field of each piece of configuration information in the access viewType and the viewinfo obtained by the comparing step S02 indicates that the piece of configuration information is the configuration information required by the currently rendered list item if the viewType field is equivalent to the viewType field of each piece of configuration information in the viewinfo;
s04, completing the creation of ViewHolder
If the configuration information is required by the currently rendered list item, the layout file name layout name is obtained from the corresponding configuration information, the layout file name layout name is a text character string and corresponds to the name of an xml layout file, the corresponding Id of the resource file in the current application can be found through the layout name, the corresponding ViewHolder is created according to the first two digits of the type field viewType, the layout resource Id is transmitted to the ViewHolder, and the creation process of the ViewHolder is completed.
Specifically, the process of rendering a single list item specifically includes:
s05, the index of the current list item in the list is passed as an entry to the onBindViewHolder
The method comprises the following steps that Android RecycleView can continuously call an onBindViewHolder method of a custom Adapter to bind data for a current list item, and an index of the current list item in a list is used as an input parameter to be transmitted to the onBindViewHolder;
s06, according to the reference index of the onBindViewHolder in the step S05, the index of the current list item can be obtained, and then the corresponding configuration item is obtained from the configuration information viewInfo, the height information height in the configuration item is obtained, the value is the pixel value under 1280x720 resolution, the conversion is carried out according to the resolution of the current environment, the pixel value of the height under the current resolution environment is obtained, the layout parameter of the View of the current list item is modified according to the value, and the height of the list item can be modified;
s07, obtaining content configuration information from the configuration information obtained in the step S06, calling a data binding method of a corresponding type, realizing data binding, and further finishing rendering a single list item.
Specifically, the method for realizing the final layout of the RecyclerView through GridLayoutManager comprises the following steps: GridLayoutManager calls getSpanSize method of GridLayoutManager.
The invention has the following beneficial effects: the application provides a self-defined Adapter for the Android list component RecyclerView, so that the Adapter becomes a list container capable of accommodating display units with different functions and different styles. The configuration data of the server side is read, the functional components are combined together, and the display styles of the functional components are adjusted during rendering, so that different display effects are presented flexibly, and the dynamic list container is realized.
Drawings
FIG. 1 is a diagram of a dynamic layout list according to the present invention.
FIG. 2 is a timing diagram illustrating the initialization of the custom list according to the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
Dynamic layout List schematic as shown in FIG. 1
As shown, the whole page is a recycleview list, which includes 15 list items with different styles and functions, and the data list viewinfo for rendering data also includes 15 elements, and the order of the data list elements corresponds to the order of the list items in the recycleview list.
Two list items in the first row are two video playing boxes, the width span count in their configuration items is 24, that is, 1/2 of the list width, the height is 300 pixels, the type viewType is 310101 and 310102, respectively, the layout file name layout name is holder _ dynamic _ video, where the first two bits 31 represent the type of the video playing box, the middle two bits 01 represent the first row, and the last 01 and 02 represent the first and second list items of the first row, respectively, the resource Id corresponding to the resource file in the application can be found by the layout file name, so that the layout can be used to render the corresponding view, and the data item corresponding to the list item should also contain respective play address information.
Similarly, the three list items in the second row are three picture textboxes, the configuration item width spanCount of which is 16, that is, 1/3 of the list width, the height of which is 200 pixels, the types viewType of which are 320201, 320202 and 320202, respectively, and the layout file name of which is holder _ dynamic _ common, wherein the first two digits 32 represent the type of the picture textbox. Meanwhile, the data item corresponding to the list item also comprises respective text content and picture address.
Custom list initialization timing diagram as shown in FIG. 2
The steps shown in the figure are a complete process included in list rendering, wherein one part of the process is a calling process of an Android RecyclerView list, and part of the implementation process of the method is embedded or rewritten with part of a callback method, so that the effect of dynamic configuration is realized, and the method specifically comprises the following steps:
step one, initializing a RecycleView list through an xml file on an Activity page where the list is located, and setting the width and the height of the list;
step two, initializing a GridLayoutManager layout manager on the Activity page where the list is located, setting the layout direction to be longitudinal, and setting the number of grids to be 48, namely equally dividing the list into 48 parts during layout;
step three, initializing a self-defined Adapter list Adapter on the Activity page where the list is located, wherein the Adapter rewrites getItemCount (step five), getItemType (step six), onCreateViewHolder (steps seven, eight and nine), onBindViewHolder (steps ten and eleven), and the like, sets GridLayoutManager. SpanseLoupu for GridLayoutManager, and rewrites the getSpanSize method therein (step four); wherein:
by rewriting the getSpanSize method of GridLayoutManager. SpanSizeLookup, the proportion of list items in the list can be set, the configuration of the step list is combined, the width of a layout file of the list items is set to match _ parent, and the width of the list items can be customized;
in a getItemCount method of a self-defined Adapter of a list, returning the number of data list sets viewInfo so as to enable a RecycleView to create list items with specified configuration number;
returning the viewType in a getViewType method of the custom Adapter of the list;
in the onCreateViewHolder method of the custom Adapter of the list, a ViewHolder of a specified function type is created for each list item according to a viewType and a layout name, and a specified layout file is used for loading, and because the viewTypes of the list items are different, a corresponding viewHolder is created for each list item;
in the onBindViewholder method of the custom Adapter of the list, modifying the height of the list item according to the obtained height;
in the onBindViewholder method of the custom Adapter of the list, data is bound for list items by using content data;
step four, the Activity page access server where the List is located obtains configuration information, the configuration information is converted into a List data List viewInfo after being analyzed, each item of the viewInfo corresponds to information required by a List item display, the viewInfo is transmitted to a custom Adapter and a refreshing method is called, a subsequent rendering process is triggered, and a getSpanSize method in step three is rewritten, namely, the current viewInfo is obtained from the viewInfo according to a position index, and the spanCount information of the viewInfo is returned;
step five, the rendering process is executed by the Android RecycleView, firstly, a getItemCount method of the Adapter is called to obtain a total list item, and the custom Adapter returns the number of elements contained in the list of the viewInfo at the moment, namely the number of the list items in the absolute list of the configuration items;
step six, step ten is a process of creating and rendering a single list item, the RecyclerView of the Android can circularly execute the process of creating and rendering the single list item for n times according to the value n of the getItemCount, wherein a getViewType is called firstly to obtain the type of the current list item, a getViewType method is rewritten by the self-defined Adapter, and the viewType information in the configuration item is returned;
step seven, calling an onCreateViewHolder method of the custom Adapter by the RecycleView of the Android, creating a ViewHolder corresponding to the current list item, and transmitting the viewType obtained in the step six as an input parameter to the onCreateViewHolder method;
step eight, the custom Adapter traverses the configuration information viewinfo obtained in the step four, wherein each piece of configuration information contains a viewType field, and the viewType field of each piece of configuration information in the viewType and the viewinfo obtained in the step seven is compared, wherein the viewType field of each piece of configuration information (the viewType field of the configuration information is different) shows that the configuration information is the configuration information required by the currently rendered list item if the viewType field of the configuration information is equivalent;
step nine, step eight, the layout file name layout name can be obtained from the corresponding configuration information, the layout file name layout name is a text character string and corresponds to the name of an xml layout file, and the Id corresponding to the resource file in the current application can be found through the layout name; creating a corresponding ViewHolder according to the first two bits of the type field viewType, and transmitting the layout resource Id to the ViewHolder; the creation process of the ViewHolder is completed;
step ten, the Android RecyclerView can continuously call an onBindViewHolder method of the custom Adapter to bind data for the current list item, and an index of the current list item in the list is used as an input parameter to be transmitted to the onBindViewHolder;
eleventh, according to the reference index of the tenth onBindViewHolder, obtaining an index of the current list item, further obtaining a corresponding configuration item from configuration information viewinfo, obtaining height information height in the configuration item, wherein the value is a pixel value under 1280x720 resolution, performing conversion according to the resolution of the current environment, obtaining a pixel value of the height under the current resolution environment, modifying the layout parameter of the View of the current list item according to the value, and modifying the height of the list item;
step twelve, acquiring content configuration information from the configuration information acquired in the step eleven, and calling a data binding method of a corresponding type to realize data binding;
step thirteen, after the creation and rendering of the list items are completed, the RecyclerView can realize the final layout through GridLayoutManager, in the process, the GridLayoutManager can call a getSpanisize method of GridLayoutManager.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. A method for dynamically combining android layouts is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
initializing a layout manager, and setting the number of grids and the longitudinal layout direction;
initializing a self-defined Adapter list Adapter, rewriting getItemCount, getItemType, onCreateViewHolder, onBindViewHolder by the Adapter, setting GridLayoutManager. SpansSizeLooppap for GridLayoutManager, and rewriting getSpanSize method therein;
acquiring configuration data of a RecyclerView List from a server, converting the configuration data into a List data List viewInfo after analysis, transmitting the viewInfo to a custom Adapter and calling a refreshing method to trigger a subsequent rendering process, wherein each item of the viewInfo corresponds to information required by a List item display;
the method comprises the steps that a rendering process is executed by Android RecycleView, firstly, a getItemCount method of a custom Adapter is called to obtain a total list item, and the custom Adapter returns the number of elements contained in a list of viewInfo at the moment, namely the number of list items in an absolute list of configuration items;
creating and rendering a single list item;
after the list items are created and rendered, the RecyclerView can realize the final layout through GridLayoutManager.
2. The method of claim 1, wherein the method comprises: each item of the data list comprises layout data and content data, wherein the layout data comprises the width spanCount, the height, the function type viewType and the name layout name of a list item layout file of the RecycleView in the display item.
3. The method of claim 2, wherein the method comprises: the width spanCount is a two-bit positive integer, and the width proportion of the list item is determined according to the proportion of the value in the grid number spans of the RecyclerView.
4. The method of claim 2, wherein the method comprises: the height is a pixel value at a fixed resolution of 1280x720, and a specific pixel value in the current resolution environment can be obtained through calculation.
5. The method of claim 2, wherein the method comprises: the function that the list item possesses includes video playing frame, picture text show frame, picture carousel frame, special-shaped picture frame, nested list frame, and function type viewType uses a six positive integers to represent, and the first two from high order to low order direction represent the function of this list item, and the third four represents the row that this list item is located in the list, and the fifth six represents the row that this list item is located in the list, and every list item in same list possesses only viewType value.
6. The method of claim 2, wherein the method comprises: the layout name of the list item layout file is the name of the layout resource file of the application, and the Id of the layout object of the layout in the application can be obtained through the layout name.
7. The method of claim 1, wherein the method comprises: the rewriting getSpanSize method acquires the current viewInfo from the viewInfo according to the position index, and returns the spanCount information of the viewInfo.
8. The method of claim 1, wherein the method comprises: the process of creating a single list item specifically includes:
s01, obtaining the type of the current list item
The method comprises the steps that an Android RecycleView circularly executes a process of creating and rendering a single list item for n times according to a value n of getItemCount, wherein a getViewType is called first to obtain the type of a current list item, a getViewType method is rewritten by a custom Adapter, and the viewType information in a configuration item is returned;
s02, creating ViewHolder corresponding to the current list item
Calling an onCreateViewHolder method of the custom Adapter by the RecycleView of the Android, creating a ViewHolder corresponding to the current list item, and transmitting the viewType acquired in the step S01 to the onCreateViewHolder method as an access parameter;
s03, judging whether the list item is the configuration information required by the list item currently rendered
The custom Adapter traverses the obtained configuration information viewinfo, wherein each piece of configuration information includes a viewType field, and the viewType field of each piece of configuration information in the access viewType and the viewinfo obtained by the comparing step S02 indicates that the piece of configuration information is the configuration information required by the currently rendered list item if the viewType field is equivalent to the viewType field of each piece of configuration information in the viewinfo;
s04, completing the creation of ViewHolder
If the configuration information is required by the currently rendered list item, the layout file name layout name is obtained from the corresponding configuration information, the corresponding Id of the resource file in the current application can be found through the layout name, the corresponding ViewHolder is created according to the first two bits of the type field viewType, the layout resource Id is transmitted to the ViewHolder, and the creation process of the ViewHolder is completed.
9. The method of claim 1, wherein the method comprises: the process of rendering a single list item specifically includes:
s05, the index of the current list item in the list is passed as an entry to the onBindViewHolder
The method comprises the following steps that Android RecycleView can continuously call an onBindViewHolder method of a custom Adapter to bind data for a current list item, and an index of the current list item in a list is used as an input parameter to be transmitted to the onBindViewHolder;
s06, according to the reference index of the onBindViewHolder in the step S05, the index of the current list item can be obtained, and then the corresponding configuration item is obtained from the configuration information viewInfo, the height information height in the configuration item is obtained, the value is the pixel value under 1280x720 resolution, the conversion is carried out according to the resolution of the current environment, the pixel value of the height under the current resolution environment is obtained, the layout parameter of the View of the current list item is modified according to the value, and the height of the list item is modified;
s07, obtaining the content configuration information from the configuration information obtained in the step S06, calling a data binding method of a corresponding type, and realizing the binding of data.
10. The method of claim 1, wherein the method comprises: the method for realizing the final layout of the RecycleView through GridLayoutManager comprises the following steps: GridLayoutManager will call
The getSpanSize method of GridLayoutManager.SpanSizeLookup determines the number of grids occupied by each list item in a grid list, and the custom Adapter returns the width spanCount of a corresponding index in the configuration item viewInfo by setting GridLayoutManager.SpanSizeLookup for GridLayoutManager and rewriting the getSpanSize method.
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