assistive touch for android

onTouchListener interface of the View. When the View is bound with an onTouchListener, The onTouch method is called when a touch event is triggered. OnTouchEvent method: override the method in Activity. Android Touch event processing has three layers: Activity layer, ViewGroup layer, and View layer.Several Basic Principles of

Android ViewGroup touch event Transfer MechanismIntroduction In the previous blog, we learned about the Android View touch event transfer mechanism. If you are not familiar with it, you can View the Android View touch event transf

Reprint Please specify source: http://blog.csdn.net/yyh352091626/article/details/68962736 Shortcut concept Specific implementation Buildconfig Configuration Static configuration Dynamic configuration Create Remove or disable Update return stack problem Shortcut conceptShortcut is a new shortcut component for iOS-like features in

Reprint Please specify source: http://blog.csdn.net/yyh352091626/article/details/68962736 Shortcut concept Detailed implementation Buildconfig Configuration Static configuration Dynamic configuration Create Remove or disable Update return stack problem Shortcut conceptShortcut is a shortcut component for the new iOS-like feature of

Android Touch event Transfer Mechanism In the previous article, I mainly explained the Touch event transfer process in the Android source code. Now I want to use a demo and an instance to learn about the Touch event handling process in Andorid.In the

Gesturedetector convinced that the user after the first touch of the screen, not immediately following the second touch screen, that is, not "double-click" When the triggerTip://distanceX，是前后两次call的X距离，不是e2与e1的水平距离； 是前后两次call的Y距离，不是e2与e1的垂直距离How to use:1: Inheritance Gesturedetector.ongesturelistener2: Instantiation Detector Gesturedetector mdetector = new Gesturedetector (viewactivity.this, this);3: Callb

When I first started learning Android, I felt that Google's documents were not good, and when we studied gestures, I felt that Google's documents were too poor. A lot of constants, properties, and methods don't even have a description. There is no description, but there are so many gestures in ongesturelistener, it does not have a description, who can understand onlongpress and onshowpress before they try.Is there a difference between onscroll and onf

In this example, a simple Integer Calculator applies multi-touch operations: One Touch operation is addition operations, two touch operations are subtraction operations, three touch operations are multiplication operations, and four touch operations are Division operations.

(Mperformclick = = null) {Mperformclck = new Peformclick (); } if (!post (Mperformclick)) {PerformClick (); } } } . . . } Break } .. . return true; } As you can know from the above code, the Long_clickable property defaults to false as long as the clickable and long_clickable properties of the view are true (the clickable property of the view and the specific view. Setoncliklistener and Setonlongclicklistener automatically set the above

TouchEvent TouchEvent three types of events: down, move, up.Where the move event is in one operation (one of the actions described here is that the user interacts with the screen, that is, the action sequence from down to up) may occur more than once.However, we think that an action sequence will contain the above three events, therefore, in the event processing is to deal with this process, and most importantly, the down event, which is the beginning of an action sequence, there is no down

The previous article mainly describes the TouchEvent distribution process of Android. There are two important functions: onInterceptTouchEvent and onTouchEvent. These two functions can be reinstalled to complete specific logic. OnInterceptTouchEvent is defined in ViewGroup. The default return value is false, indicating that TouchEvent is not intercepted. OnTouchEvent is defined in View. When ViewGroup calls onTouchEvent, super. onTouchEvent is used. B