parcelable

) { Log.e(TAG, "Service has unexpectedly disconnected"); mIRemoteService = null; }}; For more sample code, see the ApiDemos exampleRemoteService.java. 4. Passing objects through IPC If you want to pass a class from one process to another through the IPC interface, this can be done, but you must ensure the validity of this class at both ends of the IPC, and this class must supportParcelable interface. Support for ParcelableThe interface is very important, because this allows th

element inside must be able to be supported by AIDL, including key and Value,map do not support generics.· Parcelable: All matters parcelable The object of the interface;· Aidl: All Aidl interfaces themselves can also be used in aidl files.Two types of aidl files: All aidl files can be broadly divided into two categories. A class is used to define a Parcelable o

example the following:First declare a Deathrecipient object, Deathrecipient is an interface, there is only one method inside Binderdied, when Binder dies. The system callbacks this method and we are able to remove the binder agent that was bound before and bind the remote service again.privatenew IBinder.DeathRecipient() { @Override publicvoidbinderDied() { ifnullreturn; 0); null; // TODO:这里又一次绑定远程Service }};Second, after the client binds the remote service

implement the Serializable interface, or the error will be directly notserializableexception. Of course, there are two exceptions: the domain is empty or the domain is transient described without error. If an object that implements the serializable class inherits from another class, the class either inherits from Serializable or needs to provide a parameterless constructor. The objects produced by deserialization are not created by the constructor, so many constraints that depend on the

("Com.abc.def"); Intent.settype ("Abc/def"); StartActivity (intent);/only Activity2 match If you specify a class to invoke (such as the new Intent (Xxactivity.this, Xx.class), or by SetComponent, when you create a Intent, this Intent is called the display Intent. For explicit intent, because he has indicated the specific class to invoke, Android ignores its action,category and the Data property. (Personally feel that the display of intent calls is faster than implicit) Serializable vs

Onsaveinstancestate package. This method is called before an activity is killed and can revert to its previous state when the activity returns at some point in the future.For example, if activity B is enabled and is located at activity A's front end, at some point, activity a because the system reclaims the resources of the problem to be killed, a through onsaveinstancestate will have the opportunity to save their user interface state, Enables future users to return to activity a by OnCreate (b

Onrestoreinstancestate (bundle) ( The incoming bundle parameters are recovered from the Onsaveinstancestate package. This method is called before an activity is killed and can revert to its previous state when the activity returns at some point in the future.For example, if ACTIVITYB is enabled on the front end of Activitya, at some point Activitya because the system recycles the resource to be killed, a through onsaveinstancestate will have the opportunity to save its user interface state, Ena

Charsequence-Serializable Serialized Object (serialized to file) interface-Parcelable Serialized Object (packet-to-memory) interface-Bundle is a collection of data similar to map. Use Putextras ().Methods for passing objects in intent:One is bundle.putserializable (key,object);The other is bundle.putparcelable (Key, Object);The principle of choosing a serialization method:1) When using memory, parcelable p

= new bundle ();Bundle.putserializable ("Serinfo", serinfo);Intent.setclass (Mainactivity.this, Resultactivity.class);Intent.putextras (bundle);StartActivity (Intent);Get the value of the serializable method passed overSerinfo Serinfo = (serinfo) getintent (). Getserializableextra ("Serinfo");2. Using the Parcelable methodPremise: Object needs to implement Parcelable interfaceThe syntax for passing object

is required ). Class that implements the android. OS. Parcelable interface. Import is required ). The next two data types need to be imported using import, which will be detailed later in this chapter. The method for passing data types that do not require import is the same. The procedure for passing a value of the data type to be imported (for example, a class implementing the android. OS. Parcelable Inte

The Android Message source code is described in detail. I believe you are not familiar with Handler in Android, but you must know that Handler is only a shell in itself. What actually works internally is the Message class, for the Message class, I believe everyone will not be unfamiliar, just as you often use the Message. the obtain () method is the same. But do you know what operations the obtain () method has done for us? I will lead you to the Message kingdom to find out. The first line of co

Android intent transmits objects and returns refresh I have found this knowledge before the project is required. So let's make a summary today. We all know that intent is used for activity jump. The current page of Android jumps to a new page. Of course, data or objects are usually carried during redirection. Let me talk about jump objects below. In addition, when a new activity is returned, some objects are returned together. Next, let's look at the code. As long as you can get started with And

, attrs, defStyle); initView ();} private void initView () {// 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. getdefadisplay display (); viewWidth = display. getWidth () ;}} step = textLength; temp_view_plus_text_length = viewWidth + textLength; second = viewWidth + textL

some point, activity a because the system reclaims the resources of the problem to be killed, a through onsaveinstancestate will have the opportunity to save their user interface state, Enables future users to return to activity a by OnCreate (bundle) or onrestoreinstancestate (bundle) to restore the state of the interface.About Onsaveinstancestate () is to save some view useful data to a Parcelable object and return it inside the function. Calls the

In Android, there are 2 ways to transfer objects, namely, Bundle.putserializable (Key,object) and bundle.putparcelable (key, object) intent. Of course, these object is a certain condition, the former is the implementation of the serializable interface, and the latter is the implementation of the Parcelable interface, the following is an example I do for youFirst we set up a project named: ObjecttestdemoThen we modify the Main.xml layout file, mainly a

person who = new person (); Person.setname ("Hwaphon"); Person.setaddress ("Anhui"); Intent Intent = new Intent (mainactivity.this,secondactivity.class); Intent.putextra ("person", person); StartActivity (intent); Finish (); Receiving data in the activity Intent Intent = Getintent (); person who = (person) intent.getserializableextra (' person '); Using the Serializable method is very simple, but the efficiency is not optimis

. (4) OneWay indicates that the user requests the corresponding function without waiting for the response to call back directly, non-blocking effect, which can be used to declare an interface or declare a method, and if the OneWay keyword is used in the interface declaration, all the methods declared by the interface are oneway. (5) Aidl Transfer of non-basic variable length variable (not final object), the need to implement Parcelable interface.Par

The previous article on the creation and activation of activity, this one, we talk about the activity of data transmissionData transfer between activity, the main introduction here is the transfer of simple data between activity, directly with the bundle to pass the basic data type data. Another data type is parcelable and serialableThere are two ways to pass data with bundles, and this article explains it from two different aspects.First, the use of

IPC transmits complex objects through aidl 1. Define data transmission objects Person. aidl file: In the person. Java file: (1) Implement the parcelable Interface (2) provide a static final attribute named creator Package com. liujun. aidl; Import Android. OS. parcel; Import Android. OS. parcelable; Public class person implements parcelable { Private strin

Android system layer development. aidl does not bring a lot of overhead in programming and is not very complex. Let's take a look at aidl programming in Android.1.1 Use aidl to declare remote interfaces The syntax of aidl is actually very simple. Basically, we can regard it as a format similar to the C header file in Java. It only includes the method definition, but does not contain the implementation. Most of these interfaces define one or more interfaces. abstract definitions of these interfa