Android

Learning Journey Based on Android NDK ----- HelloWorldHello World, as the initial stage of all programming languages, occupies an unchangeable position. All Chinese/English/French/German/American ...... In the version programming textbooks, hello

Note:1. onDown multi-point events still respond to single-point events2. triggered when onScroll slides, e1 can only get one point, while e2 can get more points. (I don't know why)3. Add GestureListener to the view.You can use the following

After learning about the android layout today, I felt a bit messy and error message. There are three types of information: ANR, FC, and OOM.ANR (Activity or Application not Respond) appears in two cases:A) Activity key: There is no response after

There are three ways to set the transparency effect 1. Use the transparent effect of the android SystemJava codeAndroid: background = "@ android: color/transparent" For example, set buttonJava code Android: text = "@ + id/Button01" Android: id = "@

Custom animation in android has two modes: tweened animation and frame by frame. Here we introduce a method to implement tweened animation through xml.Tweened animation (gradient animation) has four types of animation: alpha (transparency), scale

DatagramPacket indicates a data packet. A datagram packet is used to deliver a connectionless package. Each packet is routed only from one machine to another based on the information contained in the packet. Multiple packages sent from one machine

/*************************************** *************************Implement a translucent Activity that overwrites the previous activity. The following activity is still visible.Bytes ------------------------------------------------------------------

Implement a drop-down box under the specified control, just as you can select your QQ number in the drop-down box when logging on to QQ.Implementation idea: to implement the pull-down effect under the specified control, first, determine the starting

In Android Application Development, cross-process communication is used, such as calling dialing, text messages, and emails in third-party applications, when data is transmitted in this process, the current application (one process) calls another

A very important problem to solve when using View for dynamic plotting is how to redraw the screen. The Android View class provides a postInvalidate () method, which automatically calls the onDraw method in the View to redraw the screen.The

For APP development and google api, only ROOT mobile phones are used. For non-ROOT mobile phones, apk cannot be installed. Therefore, two versions of apk are required. It is difficult to maintain two sets of programs. The following uses

Recently, due to project requirements, tcpdump is currently used1. Get the root permission on the mobile phone It is too cumbersome to use the cmd Tool to download the root mobile phone. We recommend a "Zhuo "tool to download and install the tool

There are three methods to obtain the thumbnail of a video file in android: 1. query from the media Repository 2. Use the ThumbnailUtils class after android 2.2 3. Call the jni file to implement the MediaMetadataRetriever class. Advantages and

There are three main categories: Category 1: positioning between two components (A is located above B, below, or left or right) Android: layout_above = "" Android: layout_below = ""Android: layout_toLeftOf = ""Android: layout_toRightOf = ""   Class 2

The component code is as follows:[Java]Public class PageControl extends LinearLayout implements OnClickListener {Private ImageButton firstImg;Private ImageButton preImg;Private ImageButton nextImg;Private ImageButton endImg;Private TextView

Android intent and intent action OverviewIntent is frequently used in android. Intent is used for system functions, whether it is page redirection, data transmission, or external program calling. After some intent examples, I sorted out the intent

PostInvalidate (); interface refresh  A list element may be 48px by default.Android: visibility = "invisible"> set the component to show visible, not to show invisible, and disappear gone.Android: background = "@ null" sets no background for

After the Android source code is compiled successfully, you need to perform the following steps to re-compile android. jar with your own API:1. add your own source code, create a folder under the framework/base Directory of the android source code

The previous section introduced Android ApiDemos to skip the examples related to OpenGL, but to write a tutorial for OpenGL programming. Here we will add the parsing of OpenGL ES examples in Android ApiDemos. Textured Triangle describes how to add

There are two types of Android dialogs: PopupWindow and AlertDialog. Their differences are:The position of AlertDialog is fixed, while the position of PopupWindow can be random.AlertDialog is a non-blocking thread, while PopupWindow is a blocking