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Piglet's Android starter Road Day 4-part 3--handler message passing mechanism of Android event processing mechanism------------ Reprint Please specify the source--coder-pigIntroduction to this section:In the previous two sections, we have learned more about two kinds of event handling mechanisms: Listening and callback.Seemingly completed the

Android Data Binding code practice (farewell to findViewById) (4), androiddatabinding Data Binding practice (1)Data Binding Syntax Parsing (2)Advanced Data Binding usage (III)Well, after learning Data Binding in the first three articles, we can find that its power is as follows: 1. Use the MVVM mode to clear the entire project structure2. Connecting views and models through ViewModel decouples views fro

Android (Lollipop/5.0) Material Design (4) defines shadow and cropping View Official Website: https://developer.android.com/intl/zh-tw/training/material/shadows-clipping.html The Material design introduces a depth value to the UI element. depth helps you understand the relative importance of each element and focuses on the task at hand. The elevation value of each View is equivalent to the z attribute, whic

Basic tutorial for Android -- 8.3.7 Paint API -- Xfermode and PorterDuff (4)This section introduces: In the previous section, we wrote the first example about the use of Xfermode and PorterDuff: Implementation of ImageView for rounded corners and circular images,We have realized the benefits brought by PorterDuff. Mode. DST_IN. In this section, we will continue to write examples for practical practitioner

Android video recording tutorials from getting started to getting started (4) ---- Camera Parameter, androidparameter Camera provides a method called setParameters to help developers set Camera parameters. The getParameters method of Camera can be used to obtain the parameters currently set for the Camera. The following describes the usage of several parameters used for video recording. 1. Set the PreviewSi

1. click the button, specify the action and uri, and set the result code (ResultCode) to reach the Gallery of the default album on the mobile phone. The Code is as follows:1. public void onClick (View v ){2. // TODO Auto-generated method stub3. Intent intent = new Intent (Intent. ACTION_PICK,4. android. provider. MediaStore. Images. Media. EXTERNAL_CONTENT_URI); // start the Photo Gallery5. startActivityFo

Previously learned MediaPlayer used to play mobile music, but in the phone a lot of tone is not used MediaPlayer to play such as SMS ringtone, notification ringtone, Android using Soundpool to play small audio files;Learn the use of Soundpool together below"1" Set a button to play the start of the first interface"2" Get SoundpoolLook at the API and learn that there are two ways to get soundpool depending on the versionUsed before version 21Soundpool p

Android multimedia-4-step SoundPool I have learned before that MediaPlayer is used to play mobile phone music, but many of the prompts on mobile phones are not played using MediaPlayer, such as text message ringtones and notification ringtones, use SoundPool in android to play small audio files; The following describes how to use SoundPool.[1] set a button on th

, and the Android:stretchcolumns property solves the problem If the number of columns in a row is not the same as the other rows, merge the cells with the Android:layout_span property Example code for TablelayoutTablelayoutxmlns:android= "Http://schema.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:stretchcolumns= "1" > TableRow> TextViewAndroid:layout_height=

Java 4 Android: all objects (1) We always like to use C ++ and Java for comparison. Although I have used both of them, I forget them. My first job gave me the oldest language (relative to the two) C. Of course, the conversion from the downloaded library to Android forces the user to return to the object-oriented world... 1. Use a reference operation object. In C/

Four states of activity in Android:1)active/runing: After a new Activity is launched into the stack, it is at the top of the screen, at the topmost end of the stack, where it is visible and can interact with the user's activation state.2)Paused: State when activity is overwritten by another transparent or Dialog-style activity. At this point it remains connected to the window manager and the system continues to maintain its internal state, so it is st

. movetofirst (); Int columnindex = cursor. getcolumnindex (filepathcolumn [0]); String filepath = cursor. getstring (columnindex ); Cursor. Close (); Bitmap yourselectedimage = bitmapfactory. decodefile (filepath ); } } } 3. Use toast in the serviceJava code Public class connectionservice extends Service { Private handler = new handler (); Public void restartconnection (){ Int sleeptime = reconnectcounter * min_recon_wait; If (sleeptime> max_recon_wait ){ Sleeptime = max_recon

Now, And most Android developers use the SDK version of 2.x when they develop the Android app. In order to be compatible with 2.x mobile phone this is understandable, but the most troubling is the 2.x version of the theme is in too ugly, this is the launch of Android just consider the practical, and did not take into account the aesthetics, and now up to the oper

urlencodedformentity to create objects, note that later a string type of argument is used to specify the encoding of the httpentity entity = new urlencodedformentity (Parameters, "UTF-8"); Request.setentity (entity); //3. Execution Request HttpResponse response = Hc.execute (request); //4. To determine the success of a request by a return code if (Response.getstatusline (). Getstatuscode () = = HTTPURLCONNECTION.HTTP_OK) { return true;

Maketext represents a context object, the second parameter is represented as the displayed content, the last parameter is the length of time to display the Toast, Toast.length_long indicates a slightly longer display time, toast.length_ Short indicates a slightly shorter display time, and then don't forget to call the toast's Show method to display it. Finally, as in the previous chapter of the Phone Dialer, because the app uses system permissions, so to add a user rights to the app, add the

Mapview is the core component of ArcGIS runtime SDK forandroid. mapview can be used to present data of the map service, and mapview defines a wide range of attributes, methods, and events, you can use mapview to operate the touch screen of the device. By default, mapview can respond to various gesture operations. During GIS development, map operations are indispensable. Mapview is a subclass of viewgroup in Android and is also ArcGISThe map container

In the previous "Android custom components series [6] -- advanced practice (3)", we added the process knowledge about event distribution in Android, in this article, we will analyze the implementation of the drop-down PinnedHeaderExpandableListView. I. What is the role of the OnGiveUpTouchEventListener interface in StickyLayout? public interface OnGiveUpTouchEventListener { public boolean giveUp

Scheme Jump ProtocolOverview: The scheme in Android is an intra-page jump protocol, a very good implementation mechanism, by defining their own scheme protocol, it is very convenient to jump to the various pages in the app,Through the scheme protocol, the server can be customized to tell the app which page to jump to, you can customize the jump page through the notification bar message, you can jump through the H5 page and so on.Application Scenarios

Android launches four different ways to standard,singletop,singletask,singleinstence. Standard is the most common activity startup method and the default way to start. When you start an activity, he will go to the top of the stack that returns the stack. The system does not manage to have the same activity in the stack, in the same way as after the first out. singletop mode is when the activity starts, the system first determines whether the top of

Refer to "Professional Android 4 Development" Fragment Introduction Fragment is that we can separate the activity into components that have their own lifecycle and UI. Its greatest use is to fit different screens. Create fragment There are many similarities between fragment and activity, for example, without the UI, but it doesn't seem to make much sense for both. They are also created in similar ways, such