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Android learning Activity (1) activity and intent, androidintent
Tool: JDK environment configuration + SDK + ADT Tool
I. Main Functions of Activity:
1. interfaces between users and Applications
2. Control container
II. Key points for creating an Activity: (in the directory o
Android: allowtaskreparentingIndicates whether the activity can be moved from the started task to a task with affinity (when the task enters the foreground) -- "true", indicating that the activity can be moved, "false ", indicates that it must stay in the task at startup.If this feature is not set, the value of the allowtaskreparenting attribute set to the Genera
not know the explanation is clear.
These boot modes can be set in the feature manifest file Androidmanifest.xml, in the Launchmode property.
What is a task
When we need an activity to start another activity, perhaps another activity is defined as an activity in a differe
Android Activity switching and Activity data interaction, androidactivity
Within the Android program, startActivity starts a sub-Activity with Intent (expressed in a parent-child relationship, which is clear only and does not have the concept of Parent-Child
onsaveinstancestate () method does not need to be saved in some scenarios. For example, when you exit the activity by using the "back-to-back" key, because the user explicitly does not need to save the status to close the activity ). If the system wants to call the onsaveinstancestate () method, it can be called before the onstop () method and the onpause () method.
However, even if you haven't done anyt
The four basic components of Android are Activity,service services, content provider contents providers, Broadcastreceiver broadcast receivers.First, Activity(1) In an application, an activity is usually a separate screen that shows some controls that can also listen and handle the user's events to respond.(2) Communic
Android Development Four components--activity detailed-Android development tutorial
Android development of the four components in the development of the application is essential, below to explain the next four components of activity, summarized from the network. The life
. Of course, there is only one instance in the stack, so any activity opened by this instance will be opened in a separate task stack.Example:1, the current task stack S1 The situation is ABC(ABC startup mode is Standard or Singletop ), When you start activity D for a single instance, you create a new task stack S2 and put D in. Opening any of the ABC again from Activ
What is activity?We all know that there are four components in Android (activity, service, Content Provider, Broadcastreceiver broadcast receivers), activity is the most and most basic component we use, Because all the actions of the app are user-related, the Activity provid
What is activityActivity is the most basic of Android application core components, is the user and Program interaction window, an activity usually corresponds to a separate view, an app is composed of one or more activity, activity is used to display information to the user, And can jump between each other, the jump be
ToastToasts are a great way to remind your Android systemStart by defining a trigger point for a popup toast, such as a buttonWhere Toast.length_short refers to the length of the display and a built-in variable for Toast.length_long can be selected.Toast.maketext (firstactivity. This, "You clicked Button 1", Toast.length_short). Show ();MenuStart by creating a new menu folder in the Res directory to create a main.xml code similar to the followingMenux
specify the UI for the activity, call the Setcontentview method in the OnCreate method of the activity.
In this code snippet, a simple instance of MyView is used as the UI for the activity:
@Override public
void OnCreate (Bundle icicle) {
super.oncreate (icicle);
MyView myview = new MyView (this);
Setcontentview (MyView);
}
In most cases, you want
Four components of Android developmentFirst, the activity detailedSecond, the service detailedThird, broadcast receiver detailedFour, Content provider detailed explanationPlus an important component intent the detailed.First, the activity detailedThe life cycle of the activty is the life cycle of the process in which it resides.The starting order of an activity:O
whether you have assigned a name (Android: ID) to the control in the layout file ). If you are famous, you can leave it alone.
Since it is ready for use, do we need to implement onsaveinstancestate () on our own ()? This depends on the situation. If a variable in your derived class affects the ui or the behavior of your program, you must save the variable as well, otherwise, you do not need to, but in most cases, you must implement the pilot. By the
on whether you have assigned a name (android: id) to the control in the layout file ). If you are famous, you can leave it alone.
Since it is ready for use, do we need to implement onSaveInstanceState () on our own ()? This depends on the situation. If a variable in your derived class affects the UI or the behavior of your program, you must save the variable as well, otherwise, you do not need to, but in most cases, you must implement the pilot. By t
Analysis on Activity Startup Mode in Android deep dialysis, androidactivityPreface:
The Activity startup mode is a basic and easy to ignore problem, but it has a deep understanding of this issue and is very helpful for programmers to write a stable and efficient Android program. Today, under B's guidance, we made a goo
Android activity can be started in four ways to record and open activity traps of other applications. androidactivity
Android supports standard, singleTop, singleTask, and singleInstence.
Standard is the most common method to start an activity and the default method. Whe
life cycleThe Android system adds hooks to the activity life cycle, and we can do something in the hooks that these systems reserve.Examples of 7 commonly used hooks:protected void OnCreate (Bundle savedinstancestate)protected void OnStart ()protected void Onresume ()protected void OnPause ()protected void OnStop ()protected void Onrestart ()protected void OnDestroy ()Brief description:OnCreate (Bundle save
the My_layout.xml file, with the following code:3. Registered ActivityAndroid apps require that all application components (Activity, Service, ContentProvider, broadcastreceiver) must be in the Androidmanifest.xml file To register the myactivity, the code is as follows:If you want to set myactivity to the interface that the application starts by default, you need to configure the The 4. Rewrite the OnCreate () methodNext, rewrite the OnCreate () meth
First, let's take a look at the official Android life cycle diagram:According to this flowchart we can see that there are 7 ways in the activity life cycle, so let's talk about these methods in the next step.1. Start activity: The system calls the OnCreate method first, then calls the OnStart method, and finally calls Onresume,
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