Obtainstyledattributes four parameter construction method for the Resources.theme class.
second argument --assigning values to attributes in a layout XML file
Before setting a custom attribute, we first call our custom View in the layout file of the main activity and set a specific property for it.
The main layout file contents are as follows:
Sample results:
05-28 17:19:56.542 23575-23575/? E/customview:attr1=attr1_xml05-28 17:19:5
Generally, when creating an android view, we directly edit the XML file using a tool.
Set setcontentview (R. layout. Main) in oncreate; create a view directly.
It's just my personal habit. I still like to get these things through code.
So today I learned how to directly use the code to create an android
This article is about the Android custom view of the random generation of image verification code, development, we will often need to generate a random image verification code, but this is second, the main still want to summarize some of the custom view development process and some need to pay attention to the place.
Take a look at the effect chart first:
Fir
An overview:
Recently has been committed to the Android custom view learning, mainly in the "Android Heroes biography", as well as Csdn blog, the great God and wing of the great God of some articles, wrote in detail, his whim, learned to write a similar satellite effect to achieve a custom view, Share to the blog, loo
for the length is not the same", "This is the test data bar"
}; Vmview.color (Getresources (). GetColor (Android).
R.color.black)). Textsize (sp2px (This)). Datas (Datas). commit ();
Vmview.startscroll (); Vmview.setonclicklistener (New View.onclicklistener () {@Override public void OnClick (View v) {Toast.maketext (Mai
Nactivity.this, "The current index is:" + vmview.getcurrentposition (), Toast.
FromArticle: [Android source code] Android graphic rendering (skia EGL OpenGL ES)
Android OpenGL ES coordinate system: it is three-dimensional (of course there are also two-dimensional, but there is no Z axis, there is no difference), the coordinate origin of the coordinate system is in the center of the screen, the X axis is horizontal to the right, Y axis ve
, let the child view reset.Wrap
PS: It was originally implemented in Eclipse ListView, but think that Google has no support for Eclipse, and that ListView is quickly replaced by Recyclerview, so finally switch to Android studio, With Recyclerview to achieve a set.
Source Address
The above is a small set to introduce the Android custom
Based on the information available, you 've got an XML error, and it's on line 2 of COM. mmiku. todolist. todolistitemview. because the com. mmiku. todolist. error Caused by todolistitemview not found. correct.
11-30 01:45:52. 610: E/androidruntime (545): Android. View. inflateexception: Binary XML file line #2: Error inflating class com. mmiku. todolist. todolistitemview
11-30 01:45:52. 610: E/androidrunti
center position of the parent controlCentervertical the vertical center position of the parent control3. Framelayout Frame LayoutLayout_gravity sets the location of the child controlforeground= the "#4f00" setting is drawn on top of all child controls drawableForegroundgravity sets the Gravity property of drawable that is drawn on top of all child controlsMeasureallchildren calculating the size of all child controlsAbout the layout of this piece, basically commonly used is the linear layout and
1, in very many cases, we may not know the ID of the control, but we want to include this control in the view to find it, can be used for example, the following practices:Example: Find all of the button controls in the activity's root viewprivate void Findbutton (ViewGroup group, list{if (group! = null){for (int i = 0, j = group.getchildcount (); i {View child = Group.getchildat (i);if (Child instanceof But
Android: Custom View for simulating water wave effects, android Water Wave
Github address: https://github.com/nuptboyzhb/WaterWaveView
Welcome Fork, welcome Star
1. Check the effect first.
2. Check the key code again.
Plotting Function y = Asin (wx + d) + offset
/*** Use the Path to depict the drawn area ** @ return */private Path getFristWavePath () {/
For example: To add a button, view to a linearlayout is a button and the parent view is linearlayout. The properties of the child view are set by Layoutparams. Note that the linearlayout.layoutparams, because the height of the child view, the width of these are for the parent view
space, if in a frequent repetition of the process of a large number of new objects will cause memory waste.
3. Rewrite the Onmesure method to determine the view size:when you do not rewrite the Onmeasure method, the system calls the default Onmeasure method:
@Override
protected void onmeasure (int widthmeasurespec, int heightmeasurespec) {
super.onmeasure ( Widthmeasurespec, Heightmeasurespec);
The purpose of this method is to mea
I came across a custom view in XML that was defined in the form of an inner class, resulting in some pits. Although by reading some of the predecessors wrote the article to solve the problem, but I see a few of them are not completely clear why, so decided to do this summary.
Rules for using custom internal Class View
This article is mainly to summarize why, so first of all in the XML layout file referenc
);
The purpose of this method is to measure the size of the control. In fact, the Android system in the load layout is the system to measure the size of each child view to tell the parent view I need to occupy a lot of space, and then the parent view will be based on their size to decide how much space allocat
Notification is a message that is displayed outside of your application's regular interface. When the app lets the system send a message, the message is first displayed as a chart in the notification bar. To see the details of the message you need to go to the notification drawer (notificationdrawer) to view it. The notification and notification drawers (Notificationdrawer) are system-level controlled and you can
, 140, 200, 160); Canvas.drawroundrect (Rectf_body, ten, ten, paint); Draw rounded rectangles//draw arms (rectangles with arcs) RECTF rectf_arm = new RECTF (85, 75, 105, 140); Canvas.drawroundrect (Rectf_arm, ten, ten, paint); Draw left arm Rectf_arm.offset (120, 0); Set the offset on the x-axis by 120 pixels canvas.drawroundrect (Rectf_arm, ten, ten, paint); Draw right arm//Draw two legs (also two rectangular rectangles) rectf Rectf_leg = new RECTF (12
First, the preface
Android to achieve rounded rectangles, circles or ellipses and other graphics, generally mainly a custom View plus the use Xfermode of the implementation. The way to achieve fillet picture is actually quite a lot, common is to use Xfermode , Shader . This article directly inherits ImageView , uses the BitmapShader method to realize the circle, the round angle and the ellipse drawing, aft
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