android getapplicationcontext

From the touch of Android, everywhere can see the context of the figure, after viewing the source code you will find that it is only an abstract class, the implementation is implemented in Contextwrapper.When you go to see the source of Android, you will find Activity,service and application are inherited from Contextwrapper, that is, they are the sub-class of the context, then we should give the context of

Reprint: http://www.myexception.cn/android/1968332.htmlThe difference between Activity.this and Getapplicationcontext in AndroidContext-related content is often encountered in AndroidA brief discussion of the context: in the statement alertdialog.builder Builder = new Alertdialog.builder (this); , the parameter required to be passed is a context, where we are passing in this, then what does this one refer t

Differences between this, getApplicationContext (), and getApplication () in Android, getapplicationThis: indicates the current Activity, which represents the current Activity, in other words, Activity. this can be abbreviated as this in Activity.GetApplicationContext (): the entire application lifecycle is destroyed only when the application is destroyed.GetApplication (): share global data in andorid deve

From the touch of Android, everywhere can see the context of the figure, look at the source code you will find that it is only an abstract class, the detailed implementation is implemented in Contextwrapper.When you go to view the source code of Android, you will find activity. Both service and application inherit from Contextwrapper. That is, they are all sub-classes of the context, then how should we give

entire application, which clearly exceeds its life cycle. So, here we can only use the activity's this.Error occurred with new Alertdialog.builder (Getapplicationcontext ()):E/androidruntime (5844): android.view.windowmanager$badtokenexception:unable to add window--token null was not for a app LicationThen looked up:Getapplicationcontext () life cycle is the whole application, application destroy it to destroy Activity.this context belongs to activit

Defining a user information class/**title: User Login information * @author Java Development group* @version 3.0*/public class Gf_controluserinfo extends Application {... OmittedTo configure global claims in Using Global variablesGf_controluserinfo Gf_controluserinfo = (gf_controluserinfo) getapplicationcontext ();

Have seen a lot of applications inside, readily use Getapplicationcontext (), do not want to say also not willing to say, today reproduced an article to distinguish between the difference:Context-related content is often encountered in AndroidA brief discussion of the context: in the statement alertdialog.builder Builder = new Alertdialog.builder (this); , the parameter required to be passed is a context, where we are passing in this, then what does t

entire application, which clearly exceeds its life cycle. So, here we can only use the activity's this.Error occurred with new Alertdialog.builder (Getapplicationcontext ()):E/androidruntime (5844): android.view.windowmanager$badtokenexception:unable to add window--token null was not for a app LicationThen looked up:Getapplicationcontext () life cycle is the whole application, application destroy it to destroy Activity.this context belongs to activit

Getapplicationcontext () Application context is associated with the applicaition and would always be the same throughout the life cycle.Getbasecontext () should not being used just use Context instead of it which was associated with the activity and Coul D possible be destroyed if the activity is destroyed.getapplication () is available to Activity and Services only. Although in current Android Activity and

Difference between getApplicationContext () and getbasecontext () and this, getbasecontextGetApplicationContext () returns the context of the application. The life cycle is the whole application, and the application is destroyed only when it is destroyed. The context of Activity. this returns the context of the current activity, which belongs to the activity. If the activity is destroyed, it is destroyed. Getbasecontext () returns the context sp

From: http://stackoverflow.com/questions/1026973/android-whats-the-difference-between-the-various-methods-to-get-a-context In various bits of Android code I 've seen:In a large amount of Android code, I see the following statement: Public class myactivity extends activity {Public void method (){Mcontext = This; // Since activity extends ContextMcontext =

for a long time. It is stuck on this always-connected interface. After finding a solution for a long time, I found a solution. After checking and canceling the following Contact all update sites during install to find required software check box, quickly started, and soon completed the plug-in installation. This method is used for online installation. In addition, this problem also occurs when ADT is installed locally. In the end, the problem is fixed after network disconnection. In short, Gen

connected, and finally found a long time after finding a solution, that is, the following that the contact all update sites during install to find required software this check to cancel, the speed of the rapid walk, Very fast plug-in installation is complete. Because it is installed in this way, in addition to the installation of ADT Local installation will also have the problem of this stuck, and finally the network and then install the solution. After all, it is very good to use the genymotio

Get Global Context (Getapplicationcontext) _ Create shared Preference Tool Class _ Implement automatic login=========================== Gets the global context (Getapplicationcontext) ========================1. Create the MyApplication extends in the Com.example.autologin.myapplication package applicationCode:1 Public classMyApplicationextendsApplication2 {3 Private Staticcontext context;4 5 @Overr

In various bits of Android code I 've seen: Public class myactivity extends activity {Public void method (){Mcontext = This; // Since activity extends ContextMcontext = getapplicationcontext ();Mcontext = getbasecontext ();}}However I can't find any decent explanation of which is preferable, and under what circumstances which shocould be used. Pointers to documentation on this, and guidance about what might

entire application, which clearly exceeds its life cycle. So, here we can only use the activity's this.Error occurred with new Alertdialog.builder (Getapplicationcontext ()):E/androidruntime (5844): android.view.windowmanager$badtokenexception:unable to add window--token null was not for a app LicationThen looked up:Getapplicationcontext () life cycle is the whole application, application destroy it to destroy Activity.this context belongs to activit

1. http://stackoverflow.com/questions/22966601/ what-is-different-between-mainactivity-this-vs-getapplicationcontext/22967165#22967165There is types of the Context:Application Context is associated with the application and would always being same throughout the life of application --it does not a change. If you are using a toast, you can use application context or even activity context (both) because Toast can displayed From anywhere with the your app

In Android, you often encounter context-related content, most of which are passed as parameters, but what is the role of it?Let's start with its usage, for example.In the statement alertdialog.builder Builder = new Alertdialog.builder (this); , the parameter required to be passed is a context, where we pass in this, so what does this one refer to? Here this refers to the activity.this, which is the activity of this statement, which is the context of t

The context obtained by getapplicationcontext is associated with the application, and the lifecycle is from application creation to destruction. Activity. This extends context, and its lifecycle is from activity creation to destruction. After figuring out the lifecycle, we can understand it. For example, if a global database operation class uses context, getapplicationcontext is used instead of activity.

Activity is actually A subset of the application context contexts. Subclasses have something that the parent does not necessarily haveThere must be something in the parent class.Getapplicationcontext (); long life cycle, as long as the application has survived it exists;This short life cycle, as long as the Activity does not exist, the system will be recycled;Among them: Getbasecontext (), Getapplication (), Getapplicationcontext ();Can not be placed