android viewgroup

right, int bottom) { } Because we're talking about view now, no child view needs to be sorted, so this step actually doesn't require extra work. To insert a sentence, for the ViewGroup class, OnLayout method, we need to set all the size of the child view is wide and high, which we will say in detail in the next article. DrawThe draw process is to draw the view style we need on the canvas. The same view exposes us to the OnDraw method.

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()) { CaseMotionevent.action_down: This. downx = x; This. Viewxdown = Rl_left.getx (); Break; CaseMotionevent.action_move:floatoffset = (Event.getx ()-DOWNX);//Sliding distance floatPosX = Viewxdown + offset;//Calculate the possible locationsMaxoffset = maxoffset > Math.Abs (offset)? Maxoffset:math. ABS (offset);if(Offset >0) {// pull to showRl_left.setx (PosX 0? PosX:0);if(PosX >=0) {//Prevent against hand, update the value of Downx This. downx + = PosX; } Lastsl

, because there is no blocking event delivery in the outer mylayout, the button responds and processes the event and prints the log of the "click button"If you return true in the onintercepttouchevent of Mylayout, the mylayout prevents the delivery of the event, which prints "click Layout" at that timeQuestion: When tapping the screen, how does the system determine which view is being clicked on?In fact, each view corresponds to a rectangular area on the screen, and when the screen is clicked, t

; }@Override Public void Computescroll() {Super. Computescroll ();if(Mscroller.computescrolloffset ()) {ScrollTo (0, Mscroller.getcurry ()); Postinvalidate (); } }}When used:protected void onCreate(Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); Adapter Adapter =NewArrayadapter This,0, color) {@Override PublicViewGetView(intPosition, View Convertview, ViewGroup parent) {int

Objective: The first few talked about the principle of custom control rendering Android custom Controls Basic Principles (i), Android custom control custom properties (ii), Android custom control of the custom Combination control (c), as the saying goes: "Good memory is not as bad as a pen, say not practice fake!!! ", as a learning slag is because did not follow

*/public static int Px2dip (Context context,float pxvalue) {final float scale = CONTEXT.G Etresources (). Getdisplaymetrics (). Density;return (int) (Pxvalue/scale + 0.5f);} /** * Convert PX value to SP value, keep text size unchanged * * @param pxvalue * @param fontscale * (Properties in Displaymetrics class scaleddensity) * @return */public static int PX2SP (context context, float Pxvalue) {final float Fontscale = Context.getresources (). Getdisplaymetrics (). scaleddensity;

round_corner_top_item_bg.xml written for the first entry is as follows: Set the background for the first entry: android:background="@drawable/round_corner_top_item_bg" I thought it was super simple, but this selector did not work in any way when testing the program !!! The selector file has been chec

In Android, you can customize classes and inherit from container classes such as viewgroup to display the layout you need. If you add a control to viewgroup but it cannot be displayed, the following example can be used for reference. (Mainly to implement the onlayout () method. In this method, perform measure () for each sub-control and then layout it .) Packa

The time to learn Android is not short, but has not been seriously read, the previous period of time to see Ask to show the above effect, usually I will use relativelayout and layout_margin* to achieveIn this hack, we'll look at another the creatingThe same type of layout-we ' ll create a custom view-Group. The benefits of using a custom ViewGroupInstead of adding margins by hand in an XML file isThese:A.It ' s easier to maintain if you ' re using It

To implement a streaming layout with less than the width of the wrapped line:Flowlayout.javaPackage Com.jackie.flowlayout;import Android.content.context;import Android.util.attributeset;import Android.view.view;import android.view.viewgroup;/** * Created by Jackie on 8/28/15. */public class FlowLayout extends ViewGroup {public FlowLayout (context context) {This (context, NULL); } public FlowLayout (context context, AttributeSet Attrs) {Super (co

Towering high-rise, the most intuitive person in the development of Android also believes that the most task is the development of the UI.So what do users see at the front desk?Yes, it's activity!.Activity is just a form, and what is actually shown to the user is view.If a person familiar with web development understands the concept of MVC. This view is the V-level, which shows the user what to see.Also used to interactively produce model data for the

); Layoutinflater.from (context). Inflate (R.layout.okcancelbar, this,true); TypedArray array= context.obtainstyledattributes (attrs, R.styleable.okcancelbar,0,0); String text= array.getstring (R.styleable.okcancelbar_oklabel); if (text==null) text="OK"; (Button) Findviewbyid (R.ID.OKCANCELBAR_OK)). SetText (text); text= array.getstring (R.styleable.okcancelbar_cancellabel); if (text==null) text="Cancel"; (Button) Findviewbyid (R.id.okcancelbar_can

Event trigger and transfer mechanism in Android Activity and ViewGroup, androidviewgroup 1. When only Activity is available: 1) Touch event trigger process: First, trigger dispatchTouchEvent and then trigger onUserInteraction again. If onTouchEvent is clicked, follow the following events (Click ACTION_DOWN and ACTION_up in two steps) trigger dispatchTouchEvent again onTouchEvent when ACTION_up event does no

Viewgroup is simply a view that can be installed. today, I encountered a problem: I needed a layout that could automatically wrap the line according to the width of the view in a row. I found it online. There are no relevant examples, but I found the idea: define a viewgroup, and then automatically check the abscissa value of the right edge of the view in the onlayout file, and determine whether to display

Sometimes we have the need to have two or more interface switches in an activity, just like Viewpager. But in these interfaces you need to be able to have listview,gridview and other components. If it is longitudinal, it seems OK, no effect, then if it is horizontal, then there will be something. Because Viewpager will intercept touch events. And if the Viewpager touch event is intercepted to the child control inside, then Viewpager cannot respond to the sliding event. So how can the interface b

The essence of measure is to translate the relative values of the attempted layout into concrete values.The Measurespec class wraps the layout requirements passed down from the parent, and each measurespec represents a requirement for width and height.Why does a layout require a parent view and a child view to decide together?　　Why not set width and height directly? If this is not the case, specify a fixed size like HTML, which will cause one to go through a lot of other extrusion.　　Because HTML

then the activity's onuserinteraction is triggered and then the dispatchtouchevent of the layout is triggered and the layout onintercepttoucheven T then triggers the button's Ontouch (which is a Action_down event) followed by a action_ The UP event triggers activity's dispatchtouchevent attention no longer triggers activity's onuserinteraction, because he does not work on action_up. Then the dispatchtouchevent of layout is triggered and then the onintercepttouchevent of the layout is triggered

In the previous sections, we focused on customizing the view's kick, and this section discusses custom ViewGroup, why customizing the ViewGroup is really about managing the view better.Custom ViewGroup is nothing more than a few steps:Ⅰ, override the Onmeasure () method to test the size of the child control.Ⅱ, overriding the OnLayout () method, calculates the lay

Reprint please indicate source: http://blog.csdn.net/lmj623565791/article/details/37567907Stroll EoE found such UI effect, feel very good, and later know that there is an open source project on GitHub ~ ~ ~ Of course this article is not to teach you how to use this open source project, but to teach you how to customize the ViewGroup to write such effects, custom viewgroup is also my pain, Hey, hope this can