viewgroup

The method invocation process in Title view and ViewGroup is summarized as follows:1. First, the Activity oncreate and initializes the view2. Then, after the Activity Onresume calls the view's Onattachedtowindow, it often does the initialization work in the Onattachedtowindow method, such as registering some broadcasts, starting the animation, etc...3. Next, if the background is set, call OnDraw, and then call Dispatchdraw if it is viewgroup.Descripti

Activity (Active) contains views (views) and viewgroups (view groups). View is a component (Widget) that is displayed on the screen. View Example: button, label (TextView), and text box (EDITTEXT). Each view is inherited from the base class Android.view.View. The View group (ViewGroup) can contain one or more view. ViewGroup itself is a special view that provides a layout that you can use to organize a se

Under normal circumstances, we will rewrite the ondraw method of linearlayout and it will not be called. This article will analyze the causes and solutions.I. symptom Android: Id = "@ + ID/ll_absolute" Android: Orientation = "vertical" Android: layout_width = "fill_parent" Android: layout_height = "fill_parent" Android: Background = "# ff000000"> The general architecture is that mylinearlayout is derived from linearlayout, and ondraw (canvas) is reloaded in the program ). However, ondraw will

1. Basic ConceptsView: The parent of all visual controls, an object that the user can interact with on the Android app screen (for example, a button drop-down box text box, and so on).A subclass of Viewgroup:view that holds the layout container for view and ViewGroup objects (linear layout, relative layout, and so on).Simply understood, view is a variety of controls (buttons, text), and ViewGroup provides a

1. Overview first onThis is probably the effect, first talk about the implementation of ideas 1. First we want to get the URL (network) or ID, path (local) of the image, bind the view to the data, Write our own Adapter2. Customizing the layout of the view to be displayed, and handling touch events for logical processing 3. Write Toggle Callback2. Implementation 1) custom adapter Here I downloaded the network picture, also can put the picture in res set ImageView contentpublic class Dragpageviewa

Start with the construction method, and then click ExecuteOnattachtowindow-->onmeasure-->onsizechanged-->onlayout--> onmeasure-->onlayout-->ondraw- ->ondetachedfromwindowThe method invocation process in Title view and ViewGroup is summarized as follows:1. First, the Activity oncreate and initializes the view2. Then, after the Activity Onresume calls the view's Onattachedtowindow, it often does the initialization work in the Onattachedtowindow method,

When writing a custom control, if you do not know the entire execution of the view, then the circle is necessary. This article is just a note, if you do not understand, welcome to spray water!!1. First, the Activity oncreate and initializes the view2. Then, after the Activity Onresume calls the view's Onattachedtowindow, it often does the initialization work in the Onattachedtowindow method, such as registering some broadcasts, starting the animation, etc...3. Next, if the background is set, cal

A few days ago in the MU class online to see the teacher's custom satellite menu, it feels very interesting, so after watching the video, I also tried to write it again, and add a drag effect (Light watching video is not useful, must do it yourself!) Remember not to copy the code).Interested students can go to MU net to see (not advertising): http://www.imooc.com/learn/300Custom control This thing, you have to test more practice, and then wrote a drawer effect of the menu, is relatively simple.T

Original translated from: http://www.cxyclub.cn/n/16666/ After implementing the fade-out effect in Android development, the viewgroup is called in the onanimationend method when an image control is removed from the interface. removeview: It took me a long time to solve the nullpointerexception problem and finally found a solution in a foreigner's forum. The direct execution method is usually as follows: @ Override Public void onanimationend (a

This problem should have been analyzed at the beginning when analyzing touch event processing. However, I thought this code was not so close to touch's topic at the time, I ignored it until I encountered a problem on it. In fact, Android development should have encountered this phenomenon more or less. I am in our own app. I also found this phenomenon. I was puzzled at the beginning, because according to my own research and analysis, only when a view accepts the touch event pressed will it be tr

The immediate subclasses derived from view are: Analogclock,imageview,keyboardview, progressbar,surfaceview,textview,viewgroup,viewstubThe indirect subclasses derived from view are: Abslistview,absseekbar, Absspinner, absolutelayout, adapterviewThe direct subclasses derived from ViewGroup are: Absolutelayout,adapterviewThe indirect subclasses derived from ViewGroup