parcelable

() + "Cache.txt" )); Os.writeobject (user); } catch (exception e) {e.printstacktrace () ; }finally {try {os.close (); } catch (IOException e) {e.printstacktrace (); } }Deserialization recovery process: isnull; try { isnew ObjectInputStream(new FileInputStream(getFilesDir()+"cache.txt")); is.readObject(); tv.setText(newUser.getUsername()); catch (Exception e) { e.printStackTrace();

we introduced the Intentfilter (intent filter). What types of data can be passed when Intent passes data?Intent can pass a very rich range of data types, Java's basic data types and String and their array form can be passed, in addition to the implementation of the Serializable and Parcelable interface objects. the difference between Serializable and parcelable?1. When using memory,

1. Aidl (Android Interface Definition Language)2, Aidl for interprocess communication, and with the service side of multiple threads concurrency, if only a single thread can use Messenger, if you do not need the IPC can use binder3, AIDL Syntax: Basic data types can be applied, List map and other limited application. Static field does not apply.4. Basic usage of AidlFirst step: Implement the. aidl fileInterface Description File 1 , imported package name 2, if the object object is used, it is req

bytes of a Chinese character.1BIT=1/16 a WordSo 16bit=1 a Chinese character11.Intent filter mechanism12. The mechanism of AM basic operation of Vim14.Serializable and Parcelable differencesThe problem with the serialization of your own defined objects in Android there are two choices one is parcelable and the other is serializable (Java).A serialization reason:① permanently saves the object, saving the by

attention: 1. Interface name and Aidl file are the same. 2. Interface and method without access modifier public,private,protected, and can not use final,static. 3. Aidl default supported types include Java base types (Int,long,boolean, etc.) and (string,list,map,charsequence), which are not required with import declarations. The element types in the list and map must be aidl supported types, and if the custom type is used as a parameter or return value, the custom type must implement the

Drawable,view is chosen ImageView, because this class can be Setimagedrawable method to set up drawable, more convenient. The listening state is simple, skip. Look directly at the state of the Save, which has two states: open and close, as long as a Boolean variable is saved. When it comes to conservation, it's natural to think about the onsaveinstancestate and onrestoreinstancestate of activity. These two methods are also available in view. In this way, we only need to save and restore the sta

There are two ways to pass Java objects in Android intent: first, by calling the Putserializable (Key,object) method of the Bundle object " See Example ", The other is by calling the Putparcelable (Key,object) method of the Bundle object " See Example ".The first method requires the delivery of the Java object implementation serializable interface--serializable interface is javase specific interface, using this method to implement the serialization of the class is very simple, declare that the s

() {//Setonclicklistener (this);} public void init (WindowManager windowmanager) {paint = Getpaint (); text = GetText (). toString (); textLength = Paint.measuretext (text); viewwidth = GetWidth (); if (Viewwidth = = 0) {if (WindowManager! = NULL) {Display display = Windowmanager.getdefaultdisplay (); viewwidth = Display.getwidth ();} }step = Textlength;temp_view_plus_text_length = viewwidth + textlength;temp_view_plus_two_text_length = viewWidth + TextLength * 2;y = gettextsize () + Getpadding

Summarize the methods for passing objects between activities. First, we encapsulate the attributes inside our JavaBean and use the parcelable interface to implement the transfer. below is the code of my class: Public class usersinfo implements parcelable {private long userid; private string username; // user name private string userpassword; // User Password private int usersex; // user gender private stri

class *{Public }-Keepclasseswithmembernames class *{Public }-Keepclassmembers Enum *{Public static ** [] values ();Public static ** valueof (Java. Lang. String );}-Keep class * implements Android. OS. parcelable {Public static final Android. OS. parcelable $ creator *;}-Optimizationpasses 5-Dontusemixedcaseclassnames-Dontskipnonpubliclibraryclasses-Dontpreverify-Verbose-Optimizations! Code/simplification/a

to create a shortcut in the form of broadcast; 2. register an intentfilter that meets specific conditions for the application's components, and then add a shortcut to start the component on the launcher's desktop. Let's look at the code for adding shortcuts (first ): Mainactivity Code: (layout Code omitted)Code: Package com. myshortcut; Import Android. App. activity; Import Android. content. intent; Import android.net. Uri; Import Android. OS. Bundle; Import Android. OS.

. Replaced by Android. telephony. smsmessage that supports both GSM and CDMA. 3 frameworks/base/telephony/Java/Android/telephony provides APIs (application programming interfaces) for basic mobile phone information ), it includes the network type, connection status, and telephone number string processing utility.3.1) celllocation indicates the abstract class of the device location. There are two Derived classes: cdmacelllocation and gsmcelllocation.3.2) The format of the Japanese phone number is

Connection: http://blog.csdn.net/Android_Tutor/archive/2010/07/16/5740845.aspx Intent can be used to transmit data between two acitifiers, such as int, string array, and list. But what if I want to pass an object? I found the information online and ran it. Mian. xml: Android: Orientation = "vertical"Android: layout_width = "fill_parent"Android: layout_height = "fill_parent">Android: layout_width = "fill_parent"Android: layout_height = "wrap_content"Android: text = "@ string/hello"/>Android: layo

Android-AIDL Summary AIDL (Android Interface Definition Language) AIDL is suitable for communication between processes and concurrent connections with multiple threads on the Service end. If it is only a single thread, you can use Messenger, if you do not need IPC, you can use BinderAIDL Syntax: basic data types are applicable, and List Map is applicable only. Static field is not applicable. Basic usage of AIDL 1. Implement the. aidl File Interface Description file 1. Imported package name 2.

Serialization, serialization, and deserializationSerialization I. Differences between serializable and parcelable Serializable is the serialization in java, and parcelable is the serialization in android. Serializable serialized files are stored on a local disk for persistent storage; The parcelable serialized files are stored in the memory, which is fast; T

onCreate (Bundle savedInstanceState ){Super. onCreate (savedInstanceState );SetContentView (R. layout. activity_main );FindViewById (R. id. btnStartBAct). setOnClickListener (new View. OnClickListener (){@ OverridePublic void onClick (View view ){Intent intent = new Intent (MainActivity. this, BActivity. class );Intent. putExtra ("user", (Serializable) new User ("henryQL", 24); // Add a custom reference Class ObjectStartActivity (intent );}});}}Called Activity: Public class BActivity extends Ac

bottom. For example, append data to Intent object, set parameters in fragment, and so on.Parcels can handle many types, including: local type, String type, array type, map type, sparse arrays type, and Parcelables and Serializables objects.Unless you have to use serializable, it is generally recommended to use Parcelables to read and write data to parcel.The advantage over serializable,parcelable is more in performance because

Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_second); TextView TV = (TextView) Findviewbyid (r.id.tv); Person person = (person) getintent (). Getserializableextra ("Person_data"); Tv.settext ("Name:" + person.getname () + "\ n" + "Age:" + person.getage ());}}Data can be removed from the Getserializableextra.Mode 3: Via Parcelable interfaceDifferent objects are serialized, and the

Parcel is a lightweight object serialization (similar to serierlizable). It can be used for inter-process communication. When used, a static creator must be written, and the data written and read sequence must be consistent. Here is an example of stackoverflow. We have studied how to transmit the list Public class myparcelinfo implements parcelable {private int feildcount; private arraylist Code : Protected void sendparcel (){ Myparc

, passing the object through StartActivity (). Festival Festival = (Festival) getintent (). Getserializableextra ("Festival_object");This invokes the Getserializableextra () method to get the serialized object passed over, then transforms it down into a Festival object, which successfully implements the function of passing objects using Intent.Parcelable Way:The implementation principle of the Parcelable method is to decompose a complete object