CN102707887B - Glidingly-selecting method for list items in listView based on Android platform - Google Patents

Abstract

The invention relates to a method for sliding selection of list items in a listView based on an Android platform, including: identifying and judging whether the coordinates corresponding to the DOWN event are within the set range, and entering the next step; otherwise, the listView control itself handles it, returns false, and enters Step 106); 102) select the current list item as the starting position, and return true; 103) slide to select all list items from the starting position to the current position according to the MOVE event; 104) identify and judge whether the UP event occurs, and enter the next step, Otherwise, return to step 103); 105) select all list items from the start position to the end position corresponding to the UP event; 106) end. This method is convenient, fast and has a good user experience when continuous items can be selected as needed.

Description

Sliding method of list items in listView based on Android platform

technical field

The invention relates to human-computer interaction programming and touch screen technology, in particular to a sliding selection method for list items (items) in a list browsing control (listView) based on an Android platform.

Background technique

On current Android phones, most of the design of the listView control is based on the user interface (UI) and efficiency, and it is also very mature. Now when users need to select multiple items in the listView, they need to click each item one by one. , time-consuming and laborious, and the user experience is poor. However, there is no method of "sliding to select an item on the listView control" or such a method has been made public under the Android platform. In order to realize this method, at least the following two key problems need to be solved:

The first key problem is that the native mechanism of the Android operating system does not support this function. The sliding operation on the listView is generally handled by the listView control itself, and then the scrolling action is realized, and the listView control itself cannot realize sliding to select the item;

The second key problem is that if a series of events of this sliding operation (a point (DOWN) event, a series of movement (MOVE) events, and a departure (UP) event) are cut off, then the listView will not be able to scroll.

Therefore, if you only consider the mechanism of Android, then the design of sliding to select the item is not achievable. In this way, the following series of technical problems must be solved:

(1) The sliding action of the finger, when to trigger the scrolling operation of the listView, and when to trigger the selection operation of the item;

(2) When the sliding action of the finger triggers the operation of selecting the item, how to implement the logical processing of the item when the finger slides up and down;

(3) When the finger slides to the last (or first) displayed item, the listView needs to be automatically scrolled up (or down);

(iv) When the listView starts to scroll automatically, how to optimize the scrolling effect to make the experience better;

(5) When responding to the UP event, perform fault-tolerant processing on the previous operations.

Contents of the invention

The technical problem to be solved in the present invention is how to provide a method for sliding selection of list items in the listView based on the Android platform, which can simultaneously realize sliding selection of items without affecting the scrolling of the listView control.

The technical problem of the present invention is solved like this: build a kind of method for sliding selection of list items in the listView based on Android platform, utilize touch screen, comprise the following steps:

101) Identify and judge whether the coordinates corresponding to the DOWN event are within the set range (selected position of the list item)? Yes, go to the next step, otherwise, it will be handled by the listView control itself, return false, and go to step 106);

102) Select the current list item as the starting position, and return true;

103) Slide to select all list items from the start position to the current position according to the MOVE event;

104) Identify and judge whether the UP event occurs? Yes, go to the next step, otherwise return to step 103);

105) Select all list items from the start position to the end position corresponding to the UP event;

106) End.

According to the sliding selection method of the list items in the listView based on the Android platform provided by the present invention, the current position in the step 103) is the first displayed list item, and the listView control automatically scrolls down; the current position in the step 103) is the last displayed list item, and the listView control automatically scrolls up.

According to the sliding selection method of list items in the listView based on the Android platform provided by the present invention, the first displayed list item is the top displayed list item, and the last displayed list item is the bottom displayed list item.

According to the method for sliding selection of list items in listView based on Android platform provided by the present invention, the last list item displayed in step 103) is the last list item of listView or the first list displayed in step 103). item is the first list item of the listView, and the listView control stops scrolling.

According to the sliding selection method of list items in the listView based on the Android platform provided by the present invention, the coordinates corresponding to the DOWN event are plane (X, Y) coordinates or horizontal X coordinates, preferably X coordinates.

According to the sliding selection method of the list items in the listView based on the Android platform provided by the present invention, the list items include respective selected controls located in the set range (selected position of the list item), and the selected controls are in step 102) -105) to mark the selected list item.

According to the sliding selection method of the list items in the listView based on the Android platform provided by the present invention, according to the false return in step 101), the MOVE event and the UP event are processed by the listView control itself.

According to the method for sliding selection of list items in the listView based on the Android platform provided by the present invention, both steps 103) and 105) include respective fault-tolerant processing.

According to the sliding selection method of list items in the listView based on the Android platform provided by the present invention, the fault-tolerant processing includes: first, when the finger slides to the last (or first) displayed item, it is necessary to realize that the listView automatically goes up ( or down) scrolling, there needs to be a smooth scrolling effect when the scrolling starts, otherwise, if only a part of the item is displayed, the screen will flicker when the scrolling starts; second, when the up event occurs , if more than half of the last selected item is not displayed on the screen, the operation of selecting the item will be canceled for the sake of operation rationality.

The sliding selection method of the list items in the listView based on the Android platform provided by the present invention breaks through the traditional thinking, creatively designs the same sliding action to respond to two different operations, and has the following advantages compared with the prior art:

1. It is convenient and fast when you need to select consecutive items;

2. Swipe to select the last displayed list item, and the listView control will automatically scroll up/down, providing a good user experience;

3. The last displayed list item is the first list item or the last list item of the listView, the listView control stops scrolling, and the user experience is very good.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is further described in detail:

Fig. 1 is the schematic flow chart of the finger sliding processing program software on the listView control on the Android touch screen smart phone according to the specific embodiment of the present invention.

detailed description

At first, illustrate the inventive idea of the present invention:

Designed based on user experience, through bold innovation, creatively design the same sliding action to respond to two different operations, so that it does not affect the listView control itself to respond to scrolling actions, and at the same time realizes the function of sliding to select items.

Second, describe the specific technical scheme and key of the present invention in detail:

Step 1. When the DOWN event occurs, set a coordinate interval according to the position of the checkBox (the interval marks the area near the checkBox). Because it is necessary to realize the operation of selecting multiple items, there will be a checkBox control in each item to mark whether the current item is selected; if the selected state of the item is marked by other controls, then the same can be done according to the position of the control Set the interval for coordinate comparison.

Step 2. According to the coordinates of the DOWN event, it is judged whether it should be handed over to the listView for processing. When the x-coordinate of the DOWN event is within the set coordinate interval, the operation of selecting the item is triggered when sliding up and down, and the checkBox control in the item is selected as a mark; if the x-coordinate of the DOWN event is not within the set interval, then Hand it over to listView directly.

Step 3. If it is handed over to listView for processing, false will be returned directly, and subsequent UP and MOVE events will not be processed, and false will be returned directly;

Step 4. If the DOWN event is handed over to its own logic processing, it returns true after the processing is completed.

The following steps are all based on the premise of handing over the sliding action to yourself (that is, sliding to select the item).

Step 5. Every time a MOVE event occurs, execute its own logic processing. First, judge whether to select the item pressed by the finger; second, if the last (first) displayed item is pressed by the finger, then Make the listView scroll up (down); finally, if the finger presses the last item of the listView, the listView stops scrolling. Return true after the logical processing is completed;

Step 6. When the UP event occurs, do some fault-tolerant processing on the end of the event, and then return true;

Step 7, end.

Third, describe in detail in conjunction with a preferred embodiment of the present invention:

As shown in Figure 1, the finger sliding processing program on the listView control on the Android touch screen smart phone of the specific embodiment of the present invention specifically includes the following steps:

301) In the listView control interface, use the touch screen to detect the occurrence of a DOWN event;

302) Determine whether the coordinates corresponding to the DOWN event are within the range set on the listView control (located at the selected position of the list item)? Yes go to step 303), otherwise go to step 201);

201) directly return false (false);

202) Waiting for the arrival of the next event;

203) Identify and judge whether the UP event has occurred? Yes return false, go to step 312); otherwise go to the next step;

204) The MOVE event occurs (the listView control scrolls);

205) return false, enter step 202);

303) Trigger item selection logic and return true (true);

304) Waiting for the arrival of the next event;

305) Identify and judge whether the UP event occurs? If yes, perform fault-tolerant processing in the later stage, return true, and enter step 312); otherwise, enter the next step;

306) Trigger item selection logic;

307) Determine whether the selected item is the first display/last display item? Yes go to the next step, otherwise go to step 309);

308) The listView control automatically scrolls up/down;

309) Determine whether the selected item is the last displayed item? Yes go to the next step, otherwise go to step 311);

310) The listView control stops scrolling;

311) Fault-tolerant processing, return true, enter step 304);

312) end.

Among them: the fault-tolerant processing in steps 305) and 311) includes, when the up event occurs, if more than half of the selected last item is not displayed on the screen, then for the sake of operation rationality, cancel the item Do the selected operation.

Finally, the above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims (6)

1., based on a sliding choosing method for list items in the listView of Android platform, it is characterized in that, utilize touch-screen, comprise the following steps:

101) identify and judge that the coordinate of corresponding DOWN event is positioned at setting range? be enter next step, otherwise processed by listView control oneself, return vacation, enter step 106);

102) choose the current list item and as starting position, return true;

103) starting position is chosen to arrive all list items of current location according to the slip of MOVE event;

104) identify and judge that UP event occurs? be enter next step, otherwise return step 103);

105) starting position is chosen to arrive all list items of the corresponding end position of UP event;

106) terminate;

Described step 103) in current location be first display list items, listView control rolls downwards automatically; Described step 103) in current location be last display list items, listView control upwards rolls automatically; Described step 103) in list items of last display be last list items of listView or described step 103) in the list items of first display be first list items of listView, listView control stops rolling.

2. according to claim 1 based on the sliding choosing method of list items in the listView of Android platform, it is characterized in that, the coordinate of corresponding DOWN event is X-coordinate.

3. according to claim 1 based on the sliding choosing method of list items in the listView of Android platform, it is characterized in that, described list items comprise each self-corresponding be positioned at described setting range choose control, described in choose control in step 102)-105) and in the selected list items of mark.

4., according to claim 1 based on the sliding choosing method of list items in the listView of Android platform, it is characterized in that, according to step 101) in return and false process MOVE event and UP event by listView control oneself.

5., according to claim 1 based on the sliding choosing method of list items in the listView of Android platform, it is characterized in that, step 103) and 105) all comprise respective fault-tolerant processing.

6., according to claim 5 based on the sliding choosing method of list items in the listView of Android platform, it is characterized in that, described step 103) in fault-tolerant processing comprise: when just starting to roll, prevent screen flicker; Described step 105) in fault-tolerant processing comprise: when UP event occurs, cancel the list items be not presented on screen is done choose operation.