Android

In general, if we want to add a border to the imageview, such as a gray box with a width of 3dp, we define a myimageview class, inherit from imageview, and draw a canvas in its ondraw method. You can also set a background image with a border.

Sometimes our project needs to rotate the button itself, rather than text or tag rotation on the button. Below is a small method to achieve 45 ° rotation: Public class mybutton extends button {public float degrees; public float swidth; public float

The data in this project is displayed through listview, and pages can be turned over through gestures. Procedure: 1. Customize listview and add gestures; 2. Custom adapter, fixed the number of entries displayed on each page; 3. Write Business Logic

  1. Socket Communication (underlying data protocol and Communication Mode) Communication Mode: synchronous and asynchronous Communication Protocol: stateful (persistent connection), stateless (impermanent connection) (unable to associate the second

1. Create an XML file under Res/drawable/, for example, shape_background_grey.xml: ①. Simple type. Android: angle = "270" indicates the direction, 270 indicates the top-down, 180 indicates the right-to-left, and the default value is the

In the following example, the permission to modify a file is 777: /** Run the Linux Command and return the execution result. */Public static string exec (string [] ARGs) {string result = ""; processbuilder = new processbuilder (ARGs); Process =

We all know that we can view the icon on the mobile phone to know what applications we have installed, but the actual uploadAndroidYou can obtain various information about your application installation.IconFor example, the name, version, and package

Class 1: the property value is true or false.Android: layout_centerhrizontalHorizontal CenterAndroid: layout_centerverticalVertical centerAndroid: layout_centerinparentCompletely centered relative to the parent ElementAndroid:

There are two commonly used timers on Android: Java. util. timer and alarmservice of the system. The role of alarmmanager is to broadcast a specified intent to us at a specific time. To put it simply, we set a time, and then when the time comes,

Document directory Processes in Android Threads in Android RPC: Remote Procedure Call Measure the test taker's knowledge about thread security. Processes in Android Threads in Android RPC: Remote Procedure Call Measure the test taker's

During work, some projects need to display the form at the top layer, such as calling pop-up window display phone numbers and other information, blocking text message information to the user or adjust the voice in the game, we think that when we put

First, let's clarify the differences between several concepts: Padding and margin: they both indicate margins. The key issue is to understand what margins are relative. Padding:Is the distance between the control content and the control edge. Margin:

1. What is tabhost.The tabhost in Android is the tab. view the tab (Sina Weibo Interface ): As for the benefits or usage of tabs, I don't want to say much about the code. 2. How to Implement tabhost in AndroidThere are two ways to achieve this. 1.

MVC (Model-View-Controller): m Refers to the logical model, V refers to the view model, and C refers to the Controller. A logical model can be used for multiple view models. For example, you can use a column chart or pie chart to represent a batch

1. animation implementation Define Res/anim/loading. XML as follows: 2. Use custom colors Define Res/drawable/progress_small.xml as follows: 3. Use an image for customizationDefine

Maybe we have such a requirement that when requesting a network image, if the picture is not completely displayed, it will display a pretty and concise progress bar, will it look very user-friendly? For example: The following is a progress bar:

1. How to implement a process that will not be killedAccording to the android documentation, when a process is not active for a long time or the system needs resources, the portal is automatically cleared to kill processes of services and invisible

Previously, the expandablelistview: External: First, let's take a look at the well-encapsulated iphonetreeview: Public class iphonetreeview extends expandablelistview attributes, attributes {public iphonetreeview (context, attributeset attrs, int

Recently, Netease news was updated to v3.5. What impressed me most was that the viewpager with the new feature was displayed as a Vertical Slide during the first application. So let's take a look at the effect of a small imitation: Source:

We have previously shared with you that by creating an activity stack list, we can record all the activities by inheriting the base class or calling functions, and finish them one by one when exiting; today, I will share with you how to exit the