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is clumsy and not easy to implement), or develop multiple versions (which sounds bad). Of course, if the return is good, it is not possible to do so, but in fact it is not.2. Return on investmentThis seems to be the established rule: Android apps tend to have less profit than IOS apps. This may be because people pay more attention to its functionality than to the quality of the app when they buy a cell phone, but that means less profit for the develo

is clumsy and not easy to implement), or develop multiple versions (which sounds bad). Of course, if the return is good, it is not possible to do so, but in fact it is not.2. Return on investmentThis seems to be the established rule: Android apps tend to have less profit than IOS apps. This may be because people pay more attention to its functionality than to the quality of the app when they buy a cell phone, but that means less profit for the develo

On Valentine's Day in February 14, Google published a new version of Android on its official Android blog. SDK publishing message (according to the date on the website, the SDK should have been updated in December February 12. It seems that Google's public relations are indeed not very hardworking ...). The SDK version is M5, in theory, this should be the last version before the first round of the prelimina

onserviceconnected and onservicedisconnected methods, and once the connection is established, a reference to the service instance can be obtained.3. Execute the binding, call the Bindservice method, pass in a intent (display or implicit) that chooses the service to bind, and an instance of serviceconnection that you have implemented8. What is the service and describes its life cycle. What are the service startup methods, what is the difference, and how do I deactivate the service?A:

the command line to create a name MYAVD,SDK version of the 2.2,SD card is the root of the D drive, the name is Scard.img, and specify the screen size HVGA. _ android Create Avd-tandroid-8-n myavd-c d:/avd/scard.img--skin 480*320. The ID of the SDK version is available through the Android list targets to see the corresponding IDs for each version9, The result of the program operation is: _____good and G

calls and is called: our Messenger of communications –intentThe life cycle of an activityLike apps from other mobile platforms, the life cycle of Android apps is controlled in a unified andThat is, we write the application fate in the hands of others (systems), we can not change it, can only learn andAdapt it.Briefly explain why this is the case: when we run an app on our phone, it's possible to call inSend in text messages, or no electricity, this t

message to NULL for recycling!There are many articles on the web about how the main thread and other sub-threads interact, transmit information, and ultimately who will perform the processing of information, such as personal understanding is the simplest way-to determine the handler object inside the Looper object belongs to which thread, then by the thread to execute!1. When the argument of the handler object's constructor is empty, it is the looper of the current thread;2. Looper.getmainloope

completes, if wants to return the concrete data, how to do? if Activity is destroyed and will be executed to Postexcutd method? The first line of code P364Links: http://www.cnblogs.com/sandyclaire1990/p/4766680.html49, View in onTouch,ontouchevent, The execution order of the OnClickPending answer50, do not use animation, how to achieve a dynamic View? Pending answer51. Update view differences between invalidate and Postinvalidate in Android?Links: ht

declaration;3, List, Map and Parcelables types, the data members contained within these types can only be simple data types, String and other supported types.5. How to reference the local language in JavaYou can use the JNI (Java Native Interface Java local interface) interface6. Talk about the IPC (interprocess communication) mechanism of AndroidIPC is the abbreviation for internal process communication and is a resource for sharing named pipes. The IPC mechanism in

required List, map, and parcelables types, which contain data members that can only be simple data types, such as string other than the supported types. (In addition: I did not try to Parcelables, compiled under the Eclipse+adt, but perhaps in the future will have some support13, the process of DVM and the process of Linux, whether the process of the application is the sameThe DVM process is the DALIVK virtual machine process, each Android p

1, talk about MVC the principle of the pattern , it's used in Android, the official Android recommendation app is developed using MVC mode. What is MVC?MVC is an acronym for Model,view,controller, and MVC consists of three parts:Model object: Is the main part of the application, and all business logic should be written on that layer.View object: Is the part of the application that is responsible for generat

Android control layer usually falls on the shoulders of many acitvity, this phrase also implies do not write code in acitivity, to through activity delivery model business Logic layer processing, Another reason for this is that the response time of Acitivity in Android is 5s, and if time-consuming operations are put here, the program is easily recycled.3) Model: the operation of the database, the operation

of the method, and if not, a new activity B instance is created. singletask: In-stack multiplexing mode. The first time the activity is started, a new task is created and an instance of the activity is initialized and placed at the bottom of the new task. But it needs to meet certain conditions. That is, you need to set the Taskaffinity property. singleinstance: Single-instance mode. This is an enhanced version of the Singletask mode, which, in addition to having all the f

In the face of the most serious vulnerabilities in history, Google has taken new measures against Android, ...... A few days ago, the network security organization Zimperium found a Stagefright vulnerability on the Android system. It is the most serious vulnerability in the history of Android, and affects about 95% of

android-Multithreading and Asynchronous Overviewmultithreading in a JavaRunableThreadThreadpoolexectorScheduleexectorThread synchronizationSynchronized synchronizationLock locksSemaphore Signal Volumetwo using multithreading in Android1, why use multithreadingIO operations: File, network, databaseComplex operationsTimed operationFor time-consuming operations, it should be run on a non-main thread to avoid blocking the main threadTo ensure a good user

first-out principle. The Looper class is used to manage the exchange of messages (message exchange) between objects within a particular thread.1) Looper: A thread can produce a Looper object that manages this line thread message queue.2) Handler: You can construct a Handler object to communicate with Looper in order to push a new message into the message queue, or to receive a message sent by Looper out of the message queue.3) Message queue (Message Queuing): Used to hold messages placed by the

can easily be killed when the system needs memory because it belongs to the empty process (the process without any active components). If its host process is killed, then the working child thread will be killed. So using sub-threading to solve is unreliable.public class Incomingsmsreceiver extends Broadcastreceiver {@Overridepublic void OnReceive (context context, Intent Intent) {Send intent start service, which is performed by the service for more time-consuming operationsIntent service = new

A few days ago interview NetEase Android Development, general feeling problem difficulty general. Blame me for not combing the knowledge, especially the foundation, there is no news back ...Written:1. Describe activity life Cycle 2. What is ANR and how to circumvent it? 3. Describe how Android Handler works 4.android service startup mode and what 6.

?It is impossible to cross-execute, only to process a message to process the next message6, for the message being executed, what will happen to call Removemessage, and will the message terminate?No, once the message is sent out, Removemessage is invalid, removemessage can onlyTo remove a message from a queueFor example, the user Quick Click button, my program can not be fast enough corresponding, what should I do?Call Removemessage first to remove the same action7, using handle is asynchronous,

used in code with the Lint tool3. Picture resources: Using Tinypng and WEBP, the following details the Picture resource optimization scheme, vector diagram4.SO files will not be removed, the current mainstream app is generally only one arm's so packageRead more20+ a great Android Open source projectHow did I get into Facebook?2018 Android face Test with answer-f