CN110018813B - Toast design method, storage medium, electronic device and system - Google Patents
Toast design method, storage medium, electronic device and system Download PDFInfo
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Abstract
The invention discloses a Toast design method, a storage medium, electronic equipment and a system, which relate to the field of mobile interconnection and comprise the steps of defining a class and defining an object acquisition method in the defined class, wherein the object acquisition method is used for acquiring the defined class by a current thread; defining a context object in the constructor of the defined class; when Toast display is needed, the defined class is acquired by a current thread, then whether the current thread is a main thread or a sub-thread is judged, if yes, a system Toast object is constructed based on a context object in a construction function of the defined class to display Toast content; if the thread is the sub thread, the sub thread sends an empty message to the message loop of the main thread through the tool Handler, and the main thread receives the message and calls the main thread to display the Toast content. The method and the system can expand the compatibility of the main process and the sub-process of the system for Toast display.
Description
Technical Field
The invention relates to the field of mobile interconnection, in particular to a Toast design method, a storage medium, electronic equipment and a system.
Background
In the Android development process, toast is a common prompt control and is used for prompting information. However, in the actual application process, the display use of Toast has the defect that Toast must be used in a main thread, and if Toast is used in a sub-thread, system operation is abnormal, so that Toast has great limitation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for designing Toast, which is used for expanding the compatibility of a main process and a subprocess of a system for Toast display.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
defining a class, and defining an object acquisition method in the defined class, wherein the object acquisition method is used for acquiring the defined class by the current thread;
defining a context object in the constructor of the defined class;
when Toast display is needed, the defined class is obtained by the current thread, then the current thread is judged to be a main thread or a sub-thread, if the current thread is the main thread, a system Toast object is constructed based on a context object in a constructor of the defined class to display Toast content; if it is a child thread, then
And the sub-thread sends an empty message to the message loop of the main thread through the tool Handler, and the main thread receives the message and calls the main thread to display the Toast content.
On the basis of the technical proposal, the device comprises a shell,
the object acquisition method is a public method, and the object acquisition method is declared to be a static method.
The context object is application-level.
On the basis of the technical scheme, when the current thread is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool type Handler, the main thread receives the message, and then a system Toast object is constructed based on the context object in the constructor of the definition class to display Toast content.
On the basis of the technical scheme, the judgment that the current thread is a main thread or a sub-thread specifically comprises the following steps:
defining an abnormal capture code block;
popping a Toast with empty content and transparent background in the abnormal capturing code block;
if the content is empty and the popup of the transparent background Toast is successfully executed, the current thread is a main thread, and if the content is empty and the popup of the transparent background Toast is failed to be executed, the current thread is a sub thread.
On the basis of the technical scheme, a display method is further defined in the defined class, and after the construction of a system Toast object is completed based on the context object in the constructor of the defined class, the Toast content of the constructed system Toast object is displayed through the display method.
The invention also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the method described above.
The invention also provides an electronic device, which comprises a memory and a processor, wherein the memory stores a computer program running on the processor, and the processor executes the computer program to realize the method.
The invention also provides a Toast design system, comprising:
the definition module is used for defining a class, defining an acquisition object method in the defined class and defining a context object in a constructor of the defined class, wherein the acquisition object method is used for acquiring the defined class by a current thread;
the judging module is used for acquiring the defined class by the current thread when the Toast display is required, and then judging whether the current thread is a main thread or a sub-thread;
the execution module is used for constructing a system Toast object based on the context object in the constructor of the definition class to display Toast content if the current thread is a main thread; if the thread is the sub thread, the sub thread sends an empty message to the message loop of the main thread through the tool Handler, and the main thread receives the message and calls the main thread to display the Toast content.
On the basis of the technical scheme, the object obtaining method is a public method, the object obtaining method is declared to be a static method, and the context object is at an application level.
On the basis of the technical scheme, when the current thread is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool type Handler, the main thread receives the message, and then a system Toast object is constructed based on the context object in the constructor of the definition class to display Toast content.
Compared with the prior art, the invention has the advantages that: defining a class, defining an object obtaining method in the defined class, obtaining the defined class by a current thread when the Toast display is needed, judging whether the current thread is a main thread or a sub-thread, and if the current thread is the main thread, constructing a system Toast object based on a context object in a constructor of the defined class to display Toast content; if the system is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool Handler, the main thread receives the message and calls the main thread to display the Toast content, display of the main thread and the sub-thread on the Toast is achieved, compatibility of the system on the Toast display is expanded, and development efficiency is greatly improved.
Drawings
FIG. 1 is a flow chart of a Toast designing method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electronic device according to 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 designing Toast, which is suitable for an Android platform, and solves the compatibility problem of system Toast display, so that Toast can be used in any thread. The Toast design method of the embodiment of the invention specifically comprises the following steps:
s1: defining a class, and defining an acquisition object method in the defined class, wherein the acquisition object method is used for acquiring the defined class by the current thread. The name of the class defined in the embodiment of the invention is DYTOAST. The method for obtaining the object is a public method, and declares the method for obtaining the object as a static method, and the method for obtaining the object specifically comprises the following steps:
public static DYToast getDYToastInstance()
the method for obtaining the object mainly facilitates other classes or obtains DYTOAST when calling, the method for obtaining the object is a public method which is a public type and can be called by other classes, and then the method is declared to be a static method which can be called directly through the classes without instantiation operation on the classes. Where DYTOAST getDYTOAStInstance () indicates that the function name is getDYTOAStInstance, the function has no parameter input, and the function will return a DYTOAST object when used.
S2: a context object is defined in the constructor of the defined class and is application-level. For a defined class of DYTOAST, the constructor of DYTOAST is
public void DYToast()；
The construction method is a return void (null return value), has no parameters, and is a function whose function name is the same as the class name. The display of Toast needs to obtain a context object, in Android, the context has two types, one of which is page-level context, usually the context object in Activity, which is one of the most basic and most commonly used four components in the Android component; the second is Application-level context, typically the context object in an Application. When the toast is displayed, a context object is needed, if the page-level context object is used, information related to the page needs to be acquired when the toast is displayed every time, the acquisition of the page information is time-consuming and can cause element information of the page held by the DYTOAST class, and the risk that the page cannot be released is caused. Therefore, the context object at the application level is selected, and is the context at the application level, so that the context does not cause memory leakage even if not released, and the acquisition efficiency of the context at the application level is more efficient.
After a Context object is defined in a constructor of a defined class, initializing the Context object in a constructor of DYTOAST, wherein a specific initialization method is to assign the Context object by calling a getapplicationContext method in Application, so that a DYTOAST class has one Context object, and the Context object can be used when the toast is displayed at the later stage.
S3: when Toast display is needed, the defined class is acquired by a current thread, then whether the current thread is a main thread or a sub-thread is judged, if yes, a system Toast object is constructed based on a context object in a construction function of the defined class to display Toast content; if it is a child thread, S4 is entered.
For the judgment of whether the current thread is the main thread or the sub-thread, specifically:
s301: defining an abnormal capture code block;
s302: popping a Toast with empty content and transparent background in the abnormal capturing code block;
s303: if the content is empty and the popup of the transparent background Toast is successfully executed, the current thread is a main thread, and if the content is empty and the popup of the transparent background Toast is failed to be executed, the current thread is a sub thread.
In Android, for the judgment of whether a Thread is a main Thread or a sub-Thread, a related class is a Thread class, a static method currentThread method is provided in the class, the method returns the name of the current Thread, the name is String-type character String information, the name information is represented as the main Thread if the name is main under the conventional condition, but some differentiated platforms return information such as main1 or main-1 and the like to represent as the main Thread, so that the judgment is carried out only by the name method, and the possibility of wrong judgment is caused.
Therefore, the embodiment of the invention defines the mode of the abnormal capture code block and directly pops up the toast content with empty content and transparent background in the abnormal capture code block. Because the popped content is empty and the background of the popped toast is completely transparent, the condition that the user cannot view the toast content is ensured, and the imperceptibility of the user is also ensured. If the Toast normal execution is successful, the current thread is determined to be the main thread, and if the Toast pop execution fails, the method executes an exception capture code block, and if an exception is captured in the code block, the current thread is determined to be the sub-thread.
The defined class is also defined with a display method, when constructing a system Toast object based on the context object in the constructor of the defined class is completed, the Toast content of the constructed system Toast object is displayed by the display method, and the display method specifically comprises the following steps:
public void show(String msg)
the method is mainly used for displaying the content of the toast, initialization operation on the toast and the like is not needed when the toast is displayed, attention to whether the current thread is a sub-thread or a main thread is not needed, and attention is only needed to the displayed content information, so that the use convenience of displaying the toast is improved, and the development efficiency is further improved.
Since one context object is held in the construction function of DYToast for displaying the Toast content of the main thread, it is possible to construct a systematic Toast object by using the context object and display the Toast content. The Toast object of the system has a static method makeText (Context, charSequence text), the method needs to transmit two parameters for calling, one is a Context object, the Context object is the Context object initialized in the DYTOAST constructor, charSequenceext text represents the content to be displayed, one parameter in the display method defined above is msg parameter of String type, the String is invariable, the String is character String of programming language, msg is a structure, since the String type is subclass of CharSequence, the CharSequence is an interface, represents a readable sequence of char value, the object of String type can be directly assigned to the object of CharSequence type according to polymorphism of object oriented language, thus the msg parameter can be directly transmitted to makeText method. Thus, a system Toast object is constructed, and Toast is displayed on the screen of the Android device by calling a show () method in the system object method.
S4: and the sub-thread sends an empty message to the message loop of the main thread through the tool Handler, and the main thread receives the message and calls the main thread to display the Toast content. Specifically, when the current thread is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool class Handler, the main thread receives the message, and then a system Toast object is constructed based on the context object in the constructor of the definition class to display Toast content.
A tool type Handler for communication between a sub thread and a main thread is provided in an Android system, and a message can be sent to the main thread in the sub thread through the tool type Handler. Based on the functional characteristic, when a toast needs to be displayed in the child thread, the display of the toast content is realized by the handler.
If the thread is a sub-thread, an empty message is sent to the message loop of the main thread by a postEmptyMessage (SHOW _ TOAST) method in the handler at the moment, the empty message does not carry additional data content, but carries some information in a message structure, so that a SHOW _ TOAST message request is received in the message queue of the main thread, and because the message receiving place is the main thread, the main thread can be directly called to display the TOAST content by the main thread, so that the purpose of displaying the message content in the sub-thread is achieved.
The method for designing Toast comprises the steps of defining a class, defining an object obtaining method in the defined class, defining a context object in a constructor of the defined class, obtaining the defined class by a current thread when Toast display is required, judging whether the current thread is a main thread or a sub thread, and constructing a system Toast object based on the context object in the constructor of the defined class to display Toast content if the current thread is the main thread; if the system is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool Handler, the main thread receives the message and calls the main thread to display the Toast content, so that the display of the main thread and the sub-thread on the Toast is realized, the compatibility of the system on the Toast display is expanded, the development efficiency is greatly improved, and meanwhile, the convenience of the Toast display of the embodiment of the invention is far higher than that of the Toast display method provided by the system.
In addition, corresponding to the above Toast designing method, the present invention further provides a storage medium, where a computer program is stored on the storage medium, and the computer program, when executed by a processor, implements the steps of the Toast designing method described in the above embodiments. The storage medium includes various media capable of storing program codes, such as a usb disk, a removable hard disk, a ROM (Read-Only Memory), a RAM (Random Access Memory), a magnetic disk, or an optical disk.
Referring to fig. 2, in response to the above Toast designing method, the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program running on the processor, and the processor executes the computer program to implement the Toast designing method according to the above embodiments.
The embodiment of the invention also provides a Toast design system based on the Toast design method, which comprises a definition module, a judgment module and an execution module.
The definition module is used for defining a class, defining an object acquisition method in the defined class and defining a context object in a constructor of the defined class, wherein the object acquisition method is used for acquiring the defined class by a current thread; the judging module is used for acquiring the defined class by the current thread when the Toast display is required, and then judging whether the current thread is a main thread or a sub thread; the execution module is used for constructing a system Toast object based on the context object in the defining class constructing function to display Toast content if the current thread is a main thread; if the main thread is the sub thread, the sub thread sends an empty message to the message loop of the main thread through the tool Handler, and the main thread receives the message and calls the main thread to display the Toast content.
The method for obtaining the object is a public method, the method for obtaining the object is declared to be a static method, and the context object is at an application level. When the current thread is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool type Handler, the main thread receives the message, and then a system Toast object is constructed based on the context object in the constructor of the definition class to display Toast content.
The Toast design system of the embodiment of the invention has the advantages that a defining module defines a class, an object obtaining method is defined in the defined class, a context object is defined in a constructor of the defined class, when Toast display is required, the defined class is obtained by a current thread, then a judging module judges whether the current thread is a main thread or a sub-thread, and if the current thread is the main thread, a system Toast object is constructed based on the context object in the constructor of the defined class to display Toast content; if the system is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool Handler, the main thread receives the message and calls the main thread to display the Toast content, display of the main thread and the sub-thread on the Toast is achieved, compatibility of the system on the Toast display is expanded, and development efficiency is greatly improved.
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 Toast design method is suitable for an Android platform and is characterized by comprising the following steps:
defining a class, and defining an acquisition object method in the defined class, wherein the acquisition object method is used for acquiring the defined class by the current thread;
defining a context object in the constructor of the defined class, wherein the context object is an application level;
when Toast display is needed, the defined class is acquired by a current thread, then whether the current thread is a main thread or a sub-thread is judged, if yes, a system Toast object is constructed based on a context object in a construction function of the defined class to display Toast content; if it is a child thread, then
The sub-thread sends an empty message to the main thread in a message loop through the tool Handler, and the main thread receives the message and calls the main thread to display the Toast content;
wherein, for the judgment that the current thread is the main thread or the sub-thread, specifically:
defining an abnormal capture code block;
popping a Toast with empty content and transparent background in the abnormal capturing code block;
if the content is empty and the popup of the transparent background Toast is successfully executed, the current thread is a main thread, and if the content is empty and the popup of the transparent background Toast is failed to be executed, the current thread is a sub thread.
2. The Toast designing method as claimed in claim 1, wherein:
the method for obtaining the object is a public method, and the method for obtaining the object is declared to be a static method.
3. The Toast designing method as claimed in claim 1, wherein: when the current thread is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool type Handler, the main thread receives the message, and then a system Toast object is constructed based on the context object in the constructor of the definition class to display Toast content.
4. The Toast designing method as claimed in claim 1, wherein: and when the construction of a system Toast object is completed based on the context object in the construction function of the defined class, displaying the Toast content of the constructed system Toast object by using the display method.
5. A storage medium having a computer program stored thereon, characterized in that: the computer program, when executed by a processor, implements the method of any one of claims 1 to 4.
6. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program that runs on the processor, characterized in that: the processor, when executing the computer program, implements the method of any of claims 1 to 4.
7. A Toast design system, comprising:
the definition module is used for defining a class, defining an object obtaining method in the defined class and defining a context object in a constructor of the defined class, wherein the context object is at an application level, and the object obtaining method is used for obtaining the defined class by a current thread;
the judging module is used for acquiring the defined class by the current thread when the Toast display is required, and then judging whether the current thread is a main thread or a sub-thread;
the execution module is used for constructing a system Toast object based on the context object in the constructor of the definition class to display Toast content if the current thread is a main thread; if the thread is the sub thread, the sub thread sends an empty message to the message loop of the main thread through the tool Handler, and the main thread receives the message and calls the main thread to display the Toast content;
wherein, for the judgment that the current thread is the main thread or the sub-thread, specifically:
defining an abnormal capture code block;
popping a Toast with empty content and transparent background in the abnormal capturing code block;
if the content is empty and the popup of the transparent background Toast is successfully executed, the current thread is a main thread, and if the content is empty and the popup of the transparent background Toast is failed to be executed, the current thread is a sub thread.
8. A Toast design system as claimed in claim 7, wherein: the method for obtaining the object is a public method, and the method for obtaining the object is declared to be a static method.
9. A Toast designing system as claimed in claim 7, wherein: when the current thread is a sub-thread, the sub-thread sends an empty message to the message loop of the main thread through the tool type Handler, the main thread receives the message, and then a system Toast object is constructed based on the context object in the constructor of the definition class to display Toast content.
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| US10116601B2 (en) * | 2015-02-06 | 2018-10-30 | Jamdeo Canada Ltd. | Methods and devices for display device notifications |
| CN107517188A (en) * | 2016-06-16 | 2017-12-26 | 大唐软件技术股份有限公司 | A kind of data processing method and device based on Android system |
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| CN107168688A (en) * | 2017-03-23 | 2017-09-15 | 武汉斗鱼网络科技有限公司 | Toast display methods and device |
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