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Android Learning Note 23. Getting Started with service components (a). What is a service?

Intent = new Intent () to start the service; Set the Action property intent.setaction ("Com.example.service.FIRST_SERVICE") for intent; Start.setonclicklistener (New Onclicklistener () {@Override public void onclic K (View arg0) {//Start specified service Startser Vice (intent); } }); Stop.setonclicklistener (New Onclicklistener () {@Override public void OnClick(View arg0) {//Close specified service StopServ

What exactly is Android LRUCache

Source:/frameworks/base/core/java/android/util/lrucache.javaThe document begins with the following comments: for garbage collection.The meaning is:A cache that maintains a strong reference to only a limited number of value.Each time a value is accessed, it is moved to the team header.When a cache is full, the element a

What happens when the Android screen is switched vertically

Screen orientation changes occur in many applications, but what happens when things change?Let's write an app to test it.Here's the code: http://download.csdn.net/detail/edwardwayne/8594291We wrote a few important stages of the Android life cycle oncreate,onresume,onstart,ondestory,onstop approach in mainactivityCalling the Toast method in it tells us that there are no triggers at these stages.In addition w

In Android, what is the difference between intent and bundle in passing values?

/** * Test the difference between using intent to pass a value directly in Android and using bundle to pass a value.** You are welcome to ask questions.* By garretly* Mail garretly@gmail.com*/ I went around EOE a while ago and saw someone asking me what is the difference between intent and bundle. Since intent can pass the value, why do we still create a bundle

"Android Advanced" Why do we create activity base class activity what is the general base class method

(); if (network! = null network.isconnectedorconnecting ()) {returntrue;}} return false;} /** * Infer If there is an Internet connection, if not. The Network Settings dialog box pops up. Returns false */@Overridepublic Boolean validateinternet () {Connectivitymanager manager = (Connectivitymanager) Mcontext.getsystemservice (Context.connectivity_service); if (manager = = null) {Openwirelessset (); return false;} else { Networkinfo[] info = manager.g

Talk about what divider is in Android _android

In Android application development you will often encounter something called divider, which is the split line between two view. Recent work to notice this divider and analysis, unexpectedly found inside the universe, surprised for heaven ... ListView's Divider 1. Custom Divider Margins ListView Divider Default is left and right at both ends of the end, how to

What is the difference between notifydatasetinvalidated () and notifydatasetchanged () in Android?

Look at the source code for these two methodspublic void notifydatasetchanged ()The method internally implements the invocation of the OnChanged event on top of each observer. This method is called whenever a change in the data set is found, or when a new state of the data is read.public void notifydatasetinvalidated ()The method internally implements the invocat

Android: What is the difference between onTouch () and onTouchEvent? I will know after reading this article

Unlike the traditional Click Touch Screen, Android Touch Screen has some Gesture gestures, such as Fling and Scroll. These Gesture greatly improves user experience. In Android, Gesture recognition (detector) is implemented through the GestureDetector. OnGestureListener interface. First, the Android event processing mec

[IPhone/Android] What should I do if the database size of the import program is different from that of the original database?

I recently made an iPhoneProgram, You need to use the database, so you are too lazy to learn core data, so you simply use the SQLite database. I used Lita (http://www.dehats.com/drupal? Q = node/58) Create a database, and then use nsfilemanager to copy the database in the project to the document directory in the program sandbox on the device, the database in the sandbox is different from the size of my original database! In a previous post ([

[Android] What Google can do is isuseramonkey ()

ActivityManager class. This is available from API Level 1. However, starting from Level 8, we were pleasantly surprised to find that there was another method called isUserAMonkey (). After reading this method, what does it mean? "Judge whether a user is a monkey "? It's impossible .. So curious, I started to view the SDK. Only "Returns" true "if the user inte

What is wipe? How do Android users go to wipe?

I. What does wipe mean? The literal meaning of the English word is "yellow", "wipe", "dry", and "clean, from the professional perspective of Flash fans, it can be considered as an operation to erase mobile phone data. What does wipe mean? Professional answers: wipe restores factory settings, including deleting contacts, text messages, installed software, and so o

What should I do if there is confusion when multiple maps are used in the same Android program ?!

In the project, maps are used on multiple pages. The map sizes are different. After the map is displayed on a small page, the map is displayed on a large page. Finally, I found a foreign website and added Android: process to the activity with manifest. xml. Android: Process = "showactivity"

What if the Android phone's memory card is not recognizable? Phone memory card does not recognize how to handle

be installed again and the test can be used properly. 4, of course, cause the cell phone memory card can not read another reason may be the cell phone partition table damage caused, at this time only need to repair the partition table can be. What you do: Install the memory card on the card reader and insert the card reader into the USB interface of your computer. Open the Run dialog box and enter the command "CMD" for the Msdos interface.

What is Android

Android is a software package for mobile devices, including operating systems, middleware, and critical applications. The Android SDK provides the tools and APIs necessary for application development on the Android platform using the Java programming language.Functional characteristics1. The application framework enabl

Android Development: What is IBinder?

The previous response briefly describes the principle of inter-process transfer of class objects. before talking about Parcel, we should first talk about something: IBinder.What is IBinder? First, you must understand that Android remote calls (cross-process calls) are implemented through IBinder. The following is a translation of

Android Development: What Is parcel (2)

The previous response explains ibinder. This is a detailed explanation of parcel. The following is an explanation of the android SDK documentation:Parcel is a container mainly used to store serialized data, which can then be passed between processes through the binder (to understand why serialization

What is the difference between an Android custom control and its three parent class construction methods

When you customize a control with Android, you typically need to override the parent class constructor. These three are enough to find the function exactly when to call?Public view is called when the Java code creates the view, and if it is a view populated from XML, it will not call thisPublic View (context context, AttributeSet attrs) This

What is the ContentDescription property of Android?

Friends who have written a Web page should know that the ALT attribute is the text that appears when the default image of the control img is displayed, if the control's picture is not set or the picture is not found, the display is not displayed, and the Alt setting text

What is activity in the Android Foundation activity chapter?

Activity is one of the four components of Android, and it is one of the most commonly used components that can be used to display a view.The official argument is that the activity is a component of an application that provides a screen to interact with the user in order to d

Android audiomanager _ What is audiomanager

The audiomanager class is located in the Android. Media package, which provides operations to control the volume and audible mode. Note: UseContext.getSystemService(Context.AUDIO_SERVICE)To get an instance of this class. Therefore, we can use the following statement: AudioManager audiomanage = (AudioManager)getAcitivity().getSystemService(Context.AUDIO_SERVICE); Audiomanager

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