writing android applications

Project requirements: 1. Create a system application TestAPP. The application starts a service after it is started. The service provides data interfaces for other applications. 2. Add a method to the acitivity source code and call the TestAPP method in the system application for data interaction. 1. Add the aidl file under the frameworks/base/core/java/android/app/directory: IHelloWorld. aidl: Package

Android applications mainly include seven components. These components are bound together in an application through the Application List. 1. Activity: the presentation layer of the application. It is the base class of the interaction component visible in the application. Generally, it is equivalent to a form in a traditional desktop application. Every screen in the application is an extension of the Activi

Copyright notice: This article from Administration Blog, reproduced please indicate the source: http://blog.csdn.net/a_zhon/.Directory (?) [+]1. A brief introduction to the NDK and JNI NDK:NDK is the abbreviation for Native Development Kit, a set of tools provided by Google that allows you to develop JNI for Android in other languages (c, C + +, or assembler). The NDK can compile multi-platform so, developers simply need to modify the Mk file

1. Install the Android Application1) Start the Android Simulator2) adb install (apk path on the PC/) *. apk (upload the apk file to the data/app directory of the OS that comes with the simulator)3) Open the apk application on the Android Simulator Interface2. Delete the Android ApplicationThere are several ways to dele

Document directory Main. xml Surfaceview is a very important drawing container because it can directly obtain image data from hardware interfaces such as memory or DMA. There are many usage of surfaceview on the Internet, and the writing method is also different, for example, surfaceview class or surfaceholder class. callback class, which can be selected based on actual functional needs. I will call the lockcanvas and unlockcanvasandpost of surfa

I went to the android development lecture held by csdn yesterday and talked about how to change the application skin and system skin. Here is a summary. Application skin replacement: 1. Build skin resources into applications. This method is rigid, that is, when the application is released, it determines what skin is available. If you want to release a new skin, you need to release the application again. In

Android activity can be started in four ways to record and open activity traps of other applications. androidactivity Android supports standard, singleTop, singleTask, and singleInstence. Standard is the most common method to start an activity and the default method. When an activity is started, it will enter the stack top of the returned stack. The system do

How does Android achieve data sharing between applications? An application can completely expose its own data, which is invisible to the outside world. It does not need to see how the data exposed by the application is stored, or whether it uses databases or files, or through the Internet, all these are not important. What is important is that the outside world can use this set of standards and unified inte

The multi-thread daemon of android applications makes it hard for you to kill it. 1. Start a service after the android Application is enabled. Public class TestserviceActivity extends Activity {/** Called when the activity is first created .*/ @ Override Public void onCreate (Bundle savedInstanceState ){ Super. onCreate (savedInstanceState ); SetContentView (R. l

The observer mode is widely used in Android, especially in listener. This article uses button as an example to introduce the observer mode. First, let's review the observer mode. The observer mode is also called the publish/subscribe mode, Model-View Mode, source-listener mode, or dependents mode) mode. The observer mode defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time. When the st

android.support.v4.** {;}If you add a gson bag, then add-libraryjars Libs/gson-2.2.2.jar-keep class Sun.misc.Unsafe {*;}-keep class com.google.gson.stream.* {;}-keep class Com.google.gson.examples.android.model.* {;}-keep class Com.google.gson.* {*;}If the project contains entities referencing interfaces , then add -keep public class * Implements java.io.serializable{public protected Private *;}IfEntity with set value injection in ProjectWords,May be in the packaging run without error, But run