Android :: Start An Activity From A Non-context Class?

May 4, 2010

For example, I have an activity that uses a utility class. I would like to be able to start an activity from the utility class and have the activity result sent back to the utility class.

The only way I could think of starting the activity was to pass the original activity to the utility class, so that the utility class could use the original activity to start the activity. The problem with this is that the activity is sent to the original activity, rather than the utility class.

I also thought of actually making the utility class an activity itself, but that would make using the utility class much more complicated.

Android :: Start an Activity from a non-context class?


Android :: Context To Use In A Activity Class?

Mar 3, 2010

I have a class defined as

public class viewGroups extends ListActivity

Somewhere in the class I have

objItem = new clsContactGroups(context);

I am wondering what is advised to be used here? Which context?
I know four choices, but maybe there are others...

this
this.getApplicationContext()
this.getBaseContext()
this.getParent()

I use this Context to show a Toast. So I would like to show on the front-most view visible.

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Android : Access Context Of A Class Which Is Not An Activity?

Jan 28, 2009

Can anyone tell me how to access context of a class which is not an activity?

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Android :: What Is The Significance Of Context In Various Constructor Of Intent Class When Starting An Activity

Mar 4, 2010

I had come across a code snippet which calls for an activity without referring to any context. Before, i was considering that context is used to tell about the calling component. But as i came see that another component can be called without any reference to context, it makes me wonder what purpose it might be serving. please put some light on it.

Here is the code which calls for an activity without referring to 'context'

CODE:............................

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Android :: Start An Activity From Non Activity Class

Aug 19, 2009

An activity can be called from existing activity through *startActivity(intent); *

Is t possible to call an activity from non Activity class ? and how?

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Android :: Way To Start Activity In Receiver Class

Nov 18, 2010

This is vinod i have been saving problem while i am starting Activity in receiver so i would know this is the way or not for start activity in receiver

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Android :: Android - How Can Start An Activity From Regular Java Class?

Feb 18, 2010

How can I start an activity from a servlet? I have an i-Jetty server installed and a servlet that responds to HTTP request. I would like to start an activity from the servlet, does any body have any idea on how to do this?

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Android :: Access Drawable Resources From A Not Context Class?

Nov 7, 2010

So I'm defining a class that sets a Drawable attribute in an object. The problem is that I can't access the getResource().getDrawable(int resourceId) method unless I have some Context.
So what I did was to send to that class an activity instance (let's call it "act") and then I did:

act.getResources().getDrawable(R.drawable.whellchair)

but, when executing that line it throws a NullPointerException.

When idea how to accomplish this?

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Android :: Communicating Between Receiver Class And An Activity Class

Jul 14, 2010

I'm just getting into Android development, and I have a question about communicating between a receiver class and an activity class. I'm very new to JAVA and Android so I hope I don't sound too stupid. I'm developing an application where I intercept an SMS message and then based on various elements of that SMS I might delete it once it's been saved to the inbox. I have a receiver class that intercepts the txt message, and I am also able to delete messages from my inbox with code in the activity class using a button at the moment. The problem I have is communicating between the receiver class and the activity class where the code to delete a message resides. I tried putting that code directly into the receiver class but as I'm sure most of you already know the BroadcastReceiver class doesn't seem to support what I need to delete messages. I've been searching for an answer to this for a while, but haven't been able to find anything. Honestly I'm not sure I know enough about JAVA and Android to even recognize a solution if I saw it.

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Android :: Access Application Class From Class Other Then Activity

Sep 8, 2010

I'm new to Java and android development. In my application I need data which is accessible for a few activities. I've read that a good solution is to use Application class for this. So I use it like this:

public class MyApplication extends Application {
private String str;
public String getStr(){
return str;
}
public void setStr(String s){
str = s;
}
}

and I can access this variable from activity like this:........................................

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Android :: Call Activity Class From Other Java Class?

Oct 8, 2010

I have just started android. I just want to know that how can i call activity class from other java class. i just want to pass class object to activity class.

public class GsonParser extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MagazineThread thread=new MagazineThread();
thread.start();
}
public GsonParser(JsonMagazineParser Obj)
{

}
}

and i am just doing like from other class. GsonParser obj=new GsonParser(this);passing obj to activity class.how can i achieve that.

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Android :: Provide Context To Call Necessary Functions In Own Utility Class?

Nov 11, 2010

Sometimes I need to provide a Context object to call specific functions, such as

Intent intent = new Intent(context, MyClass.class);

in order to start a service

context.startService(intent);

Or, provide a Context object to do a query

Cursor cursor = context.managedQuery(uri, projection, null, null, null);

If this is done in a UI class which extends Activity, that's fine.
However, If I want to create my own utility class (a singleton) that doesn't extend anything and call these functions, I don't have necessary Context object. Now my workaround is to pass an activity reference while initializing the utility class and have that reference to call those functions. I'm wondering what's the correct way to do that. It should not be reasonable to have every class to extends Context so that it can call those functions.

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Android :: Change Context For FindViewById To Super From Inline Class

Mar 12, 2010

I am trying to get the value of a EditText in a dialog box. A the "*"'ed line in the following code, the safeNameEditText is null; i am assuming because the 'findVeiwById' is searching on the context of the 'AlertDialog.OnClickListener';

How can I get/change the context of that 'findViewById' call?

CODE:.................

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Android :: Difference Between Context And Start Service Intent

May 15, 2010

I wanted to know what is the difference between Context.startService(intent) and startService(intent) and does it matter which one is used?

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Android :: Start An Activity And Return Back To Original Activity

Jan 26, 2009

I have an application with contains multiple activities. The main activity will start the others ( use startActivity() ) depends on user event, when an activity close, it calls finish() and return back to main activity. It appears to behavior like that.

However, the "problem" I see is main activity's onCreate function is called every time. I think the the main activity should be placed in the activity stack and simply push to front when others exit, therefore only onResume, onStart are called. Is there some flag I need to set or I misunderstand the activity behaviro?

In child activity, besides calling finish() or startActivity for main activity, what is other way to move main activity to front?

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Android :: Start Activity When Main Activity Is Running In Background

Jan 10, 2010

I created an application which enables the user to set whether he wants to receive notification while the application runs in background mode. If the notifications are enabled an activity should be started (the dialog should appear on the screen).

I tried to enabled it the following way:

CODE:...........

This is the method from main activity. When onPause() is executed isRunningInBackground is set true.
When I tried to debug it when the main application was running in the background the line

startActivity(intent) had no effect (the activity didn't appear).

Does anyone know how to midify the logic in order to start an activity from the main activity when the main activity is running in the background (after onPause() is called)?

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Android :: Cannot Start Service If Inner UpdateService Class Not Static

Oct 2, 2009

if the inner UpdateService class is not static, it cannot start the service. The ActivityManager complains "Unable to start service Intent"...

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Android :: Start An Activity In Different Apk Using StartActivity - Using The Activity Name Or Similar

Apr 20, 2010

I have tried to write an Android application with an activity that should be launched from a different application. It is not a content provider, just an app with a gui that should not be listed among the installed applications. I have tried the code examples here and it seems to be quite easy to launch existing providers and so on, but I fail to figure out how to just write a "hidden" app and launch it from a different one.

The basic use case is:

App A is a normal apk launchable from the application list.

App B is a different apk with known package and activity names, but is is not visible or launchable from the application list.

App A launches app B using the package and class names (or perhaps a URI constructed from these?).

I fail in the third step. Is it possible to do this?

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Android :: Activity Check Service To Start Another Activity

Sep 10, 2010

I need to made an activity (without layout) that on start check if a service is running. if it is true it starts Activity2, if it false it starts Activity1.

I tried with this code:

CODE:............

Enter code here

But when I check, in the onCreate method, if serviceConnect!=null I receive sometime a NullPointerExcption.

I tried also to insert the operation in the method onCreate in an Async Task:

CODE:............

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Android :: Start Activity And Clear Activity History

Apr 22, 2010

I have a huge maze of activities in my application. What I need to do, is that when the user logs in into the system, the activity history should be cleared. I cant just use finish() when I start a new activity, because I want the activities to have a history until the user logs in. I have experimentet with the different flags when starting an activity, but I have had no success.

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Android :: Get Activity Object While In View Context

Oct 10, 2010

This is a followup to this post: http://stackoverflow.com/questions/3897176/findviewbyid-in-a-subclassed-surfaceview-throwing-runtimeexception Based on Romain Guy's feedback (which I'll accept shortly as it is a solution), I'd like to obtain the calling Activity from within the View, so that I can use it to obtain the desired Text View resource. I don't see any methods in View that return Activity. What is the proper way to do this? Or is there a better alternative for working with TextViews from within another View context. Basically, I am calling setContentView(R.layout.xxx) in onCreate() (as usual), so I don't really have a way to pass in references to additional TextViews unless I awkwardly retrieve the View after setContentView and then make calls on it.

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Android :: Difference Between Activity / Application Context?

Nov 8, 2010

This has me stumped, I was using this in Android 2.1-r8 SDK: Code...

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Android :: Calling StartActivity From Outside Of An Activity Context

Oct 12, 2010

I have implemented a ListView in my Android application.

I bind to this ListView using a custom subclass of the ArrayAdapter class. Inside the overridden ArrayAdapter.getView(...) method, I assign an OnClickListener. In the onClick(View v) method of the OnClickListener, I want to launch a new activity.

I get the exception:

Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

How can I get the context that the ListView (the current Activity) is working under?

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Android :: Theme.Dialog Activity And Context Menu

Jun 22, 2009

i have dialog style activity android:theme="@android:style/Theme.Dialog"The menu appears about 50 px from the bottom of this dialog. So if activity screen is too small - it right in the middle of the screen. Is there any way to anchor menu to the bottom of the screen?

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Android :: How To Display Images In Activity's Context Menu?

Jan 20, 2009

Does someone know how to display images in an activity's context menu? I've tried setIcon(resId) and it doesn't work (although it does work in the Options Menu).

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Android :: Opening A Context Menu In OnCreate Of An Activity

Aug 9, 2010

I have a need to capture some user input when an activity opens for the first time. I'm hoping to give the user a list of options to select from, which will be pulled in dynamically. I'll then store the selected value locally for future use. I'm not finding a way to do what I'm after and was wondering if anyone has run into this before and how they solved it.

Fantasy Football<http://chriswstewart.com/android-applications/fantasy-football/>- Android app for fantasy football fanatics and MFL owners Social Updater<http://chriswstewart.com/android-applications/social-updater/>- An easy way to send your status blast to multiple social networks

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Android :: Pass Activity Context To Constructors To Use Internally / Is This Bad?

May 26, 2010

Is is bad practice to pass the Context to a constructor and save it as a private variable for internal use? The other option is to pass the Context as a parameter to methods that need it.

Which is the better option?
I have a feeling that passing to the constructor might result in memory leaks accidentally.

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Android :: Start A New Activity From Anther Activity

Nov 19, 2010

I want to start a new activity from ab activity that (extends from Linearlayout) .. but this code is not right

CODE:..........

public class SearchResultForm extends LinearLayout{ ...

And i get this error ..

No enclosing instance of the type SearchResultForm is accessible in scope.

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Android :: Invoking A Context Menu When An OnClickListener Is Applied To An Activity

Aug 3, 2010

Please find the code sample below:

public class Abc extends Activity implements OnClickListener{
private ListView displayList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainlayout);
displayList =(ListView)findViewById(R.id.addressbooklistview);
addressbookAdapter = new CustomListAdapter(this,addressbookList);
displayList.setAdapter(addressbookAdapter);
registerForContextMenu(displayList);}
I am not able to invoke the context menu on long press. Please let me know any solution for the same.

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Android :: All .class Files In My Java Application Loaded Into Memory After Appliaction Start?

Feb 3, 2010

I am making an app for Android, in my Activity I need to load an array of about 10000 strings. Loading it from database was slow, so I decided to put it directly into one .java file (as a private field). I have about 20 of these classes containing string arrays and my question is, are all the classes loaded into memory after my application is started? If so the Activity in which I need these strings would be loaded quickly, but the application as a whole would have a slow start...

Is there other way, how to very quickly load an 10000 string array from a file?

UPDATE:
Why I need these strings? My Android app allows you to find "journeys" in Prague's public transit - you choose departure stop, arrival stop and it finds your journey (have a look here). My app has a suggestions feature - you enter leter "c" as your departure stop and a suggestions ListView appears with stops starting with "c". For these suggestions I need the strings. Fetching the suggestions from database is slow (about 400ms on G1).

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