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consumption is large, not applicable to mobile devices such as Android.The Sax parsing XML file is event-driven, that is, his read is one-way, does not need to parse the entire document, in the process of parsing the document in the order of content, sax will determine whether the currently read characters conform to a part of the XML syntax, if the match will trigger the event, is actually some callback method, Then the judgment is processed.Advantages: Fast resolution, low memory consumption,

Fragmentpageadapter and FragmentstatepageadapterFragmentpageadapter for low-interface situationsFragmentstatepageadapter is suitable for many interfacesSee the source of the Destroyitem function found fragmentstatepageadapter in the ViewPage switch interface when the real memory is recycled, and fragmentpageadapter will notD) The life cycle of the fragment　　　　　　e) communication between the Fragement1.Fragemnt calling methods in activity　　　　　　2.Activity calling methods in fragment3.Fragment call

pointers and strong reference pointers for AndroidA basic concept has been tested6. Android Touch ProcessThe main research dispatchtouchevent, Ontouchevent, onintercepttouchevent7. Intentservice and AidlThe difference between intentservice and ordinary service, interprocess communication8. Layout SurveyLinearLayout layout_weight Meaning, the difference between AlignTop and alignparenttop in Framelayout9. The view's drawing processStudy the methods of

proficient in, the problem is.Writing a variety of mastery is actually possible, either true ox X, if not very bull X that at the end plus a proficient---- proficient in all kinds of beaten face .What is the mechanism of Eventbus? What's the difference with handler?EventBusThe event subscription bus is implemented using the observer pattern, which can be used in applications, between components, between threads, and because events can be any type of

, which is the highest quality, and of course, this pattern consumes the most memory.While argb_4444 consumes only 2byte per pixel, using argb_4444 mode can also reduce the amount of memory used by the image.4. Do not load images into memory when querying picture informationSometimes we get a picture, maybe just to get some information about this picture, than the width of the piece, height and other information, do not need to display the interface, this time we can not load the picture into me

variables in the heap, and memory addresses in the heap are stored in the stack④ instance variable: When new, the system opens up in the heap and does not necessarily provide continuous space to the variable, when the reference is lost, is included in the recyclable list, will not immediately release the heap memory⑤ Local variables: Declared in a method or code snippet, the memory is opened up in the stack, and when the local variable is out of scope, the memory is immediately released.8.TCP/I

. Adjust the policies for caching and reusing pictures.Use the phone's cache to cache frequently used images, such as the home page image, and the often-opened image setting algorithm.4. Optimize Network RequestsUse Okhttp. OkHttp supports faster retries under a bad network environment and can also use the SPDY protocol for Fast Concurrent network requests.Use Okhttp to adjust the image's pre-fetch algorithm to ensure that the image in front of the download queue in the app is prioritized, preve

, and my idea of improving a quick racer. I feel that these problems are a bit tricky, but I am a relatively heavy user of the quick, and some of these things used to be very experienced, so I hardly hesitate to saySummarize:Must master the basic knowledge, although I am not very good, but still can in the interview performance is good.Make full use of online resources, before the interview must be more brush questions, quick interview difficult, equivalent to lintcode on easy and medium difficu

What's the intent in 1.Android?A: To achieve the interface between the switch, can contain action and action data, connecting the four components of the link.What are the advantages of 2.SAX parsing XML files?A: Do not need to transfer the entire document in advance, occupy less resources3. You may need to override the option to use menu in Android (choose 2):Answer: Oncreateoptionsmenu (), Oncreatemenu ()4

1, four components of the activity life cycle, starting mode, kinship service life cycle, running process, data transfer mode, Aidlcontent provider application scenarios, production steps broadcast receiver Way2, Other: Data storage: sharepreference, file, SQLite and database object serialization: Parcelable and serializable data transfer methods of the four components intent and how the parameters are assigned, Which flag has handler,looper,handlerthread,asynctask timer Alarmmanager and timer H

, and my idea of improving a quick racer. I feel that these problems are a bit tricky, but I am a relatively heavy user of the quick, and some of these things used to be very experienced, so I hardly hesitate to saySummarize:Must master the basic knowledge, although I am not very good, but still can in the interview performance is good.Make full use of online resources, before the interview must be more brush questions, quick interview difficult, equivalent to lintcode on easy and medium difficu

One of the glsurfaceview characteristics is:1. Manage a surface, this surface is a special piece of memory. Can be directly formatted to the Android view.2. Manage an EGL display that allows OpenGL to render the content on the surface above3. Let the renderer work in a separate thread, separated from the UI thread.Second, said Contentvalues:A: He is similar to Hashtable, which stores name-value pairs. The name is of type string, and the value is the b

1. The Android asynchronous messaging mechanism has the following two ways: (Asynchronous message delivery to resolve thread communication problems)Handler and Asynctask2, the use of handler official interpretation:1), timed tasks: Use Handler.postdelay (Runnable R, time) to execute MSG at specified times.2), inter-thread communication: Perform time-consuming tasks in a child thread when performing a more time-consuming operation, and then handler (th

stop the Service; The service's Onbind () provides the default implementation, returns NULL, provides a default implementation for the service's Onstartcommand, and adds the request Intent to the queue;5, talk about Activity, Intent, Service is what relationshipThey are all the most frequently used classes in Android development. Activity and Service are among the four components of Android. Both of them a

a strong reference (which we often refer to), is characterized by the fact that the GC ignores weak references when it recycles, that is, even if a weak reference points to an object, as long as the object is not pointed to by a strong reference (and most often requires no soft reference). The object is reclaimed when it is checked by the GC. If you are concerned about the memory overhead of the app, you can consider using WeakReference, when GC reclamation swept through this area of memory wil

One of the glsurfaceview characteristics is:1. Manage a surface, which is a custom memory that can be directly formatted on the Android view.2. Manage an EGL display that allows OpenGL to render the content on the surface above3. Let the renderer work in a separate thread, separated from the UI thread.Second, said Contentvalues:A: He is similar to Hashtable, where the name value pairs are stored, the names are of type string, and the values are basic

synchronized, they can be entered. 21. When an object is passed as a parameter to a method, this method can change the properties of the object and return the changed result, so is it a value pass or a reference pass? In Java, only the value is passed, and if the object is passed, the address of the object is actually passed. 22. Scope public,private,protected, and the difference between non-write public modifier, which means any class can be accessed. Protected is a protected modifier that rep