viewgroup

Event distribution mechanismOne. Click event Propagation Path1. Click event TouchEvent first to reach activity, and then to the activity corresponding to the window, and then to Decorview, and then to the ID content of the ViewGroup, That is, we set the ViewGroup through Setcontentview to the last view. What we can control by programming is activity,viewgroup and

TouchEvent touch event mechanism in Android When our Fingers click or slide on the Android screen, the touch event TouchEvent is triggered. In the App, ViewGroup and View have multi-level nesting. In the outermost layer, there are Activity and inner View, some viewgroups between Activity and View. To simplify the discussion, we assume that only one ViewGroup exists in an Activity and only one View exists in

Touch event TouchEvent is triggered when our fingers are clicked or slid on the Android screen. In the app, ViewGroup and view exist in multiple levels of nesting, in the outermost is activity, the most inner view, between activity and view is some viewgroup. To simplify the discussion, we assume that there is only one viewgroup in an activity, and that there is

Touch event Distribution There are only two protagonists in Touch event distribution: ViewGroup and View. The Touch event of an Activity is actually a Touch event that calls its internal ViewGroup and can be processed as a ViewGroup directly. In ViewGroup, ViewGroup can also

Event distribution is a very important mechanism in Android and is the basis for user interaction with the interface. This article will create a flowchart of event distribution by using the example print log, making it easier for everyone to understand the Android event distribution mechanism. First, the necessary basic knowledge 1. Related methods The methods associated with event distribution in Android include Dispatchtouchevent, Onintercepttouchevent, ontouchevent three methods, and event

There are only two main characters in touch event distribution: ViewGroup and view. The activity's touch event is actually called the ViewGroup touch event inside it, and can be treated directly as ViewGroup.View within the ViewGroup, ViewGroup can also be in other viewgroup

There are only two main characters in touch event distribution: ViewGroup and view. The activity's touch event is actually called the ViewGroup touch event inside it, and can be treated directly as ViewGroup.View within the ViewGroup, ViewGroup can also be in other viewgroup

Dispatchkeyevent event transfer and focus acquisition in andorid DalvikVM[localhost:8601]Thread [ Workspace.dispatchKeyEvent(KeyEvent) line: 740FrameLayout(ViewGroup).dispatchKeyEvent(KeyEvent) line: 1246FrameLayout(ViewGroup).dispatchKeyEvent(KeyEvent) line: 1246FrameLayout(ViewGroup).dispatchKeyEvent(KeyEvent) line: 1246LinearLayout(

Prepared for a while, always wanted to write an event distribution of the article summed up, this knowledge point is too important. An application of the layout is rich, there are textview,imageview,button and so on, these child view of the outer layer there are viewgroup, such as Relativelayout,linearlayout. As a developer, we think, when clicked on a button, how did the Android system make sure that I ordered the button instead of the TextView? It

Measure calculation process of View in Android In Android, Veiw goes through three phases in sequence from memory to display on the UI: Traffic calculation-> Layout-> drawing, for details about the overall mechanism of View calculation, layout, and drawing, see the layout and Drawing Mechanism of View in Android. Volume is the basis of layout and drawing, so it is an important part. This article will analyze the View's quantitative calculation process from the source code perspective, which inv

boolean isLongpressEnabled () {} public boolean onTouchEvent (MotionEvent ev) {} public boolean onGenericMotionEvent (MotionEvent ev) {}} With the introduction to the basic APIs of the above GestureDetector gesture tool class, we can use all kinds of tools without any special introduction. Note:In fact, there are also GestureOverlayView gestures such as Gesture to create recognition classes, which are not described here as an extension. View and ViewGroup