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.

Android :: Get Activity object while in View context


Android :: Invoke Changes To A Custom View Object From Its Activity?

Nov 7, 2010

I have a custom view that draws to a canvas. I am trying to invoke changes to the canvas when the user pushes a button from the activity that this view is tied to. Currently, I am attempting to do this by calling a public method, called setNewDrawable, that I created inside the view.

The debugger is giving me different values for the view ID depending on whether I'm inside setNewDrawable or inside the Overridden onDraw method when I post an Invalidate.

For example the debugger variables show: (This - MyView id=830067720176) or (This - MyView id=830067712344) in setNewDrawable and onDraw respectively. This makes me think I basically have two copies of the object and I am essentially interacting with the wrong one.

How can I get information to my custom View in order to determine what it draws?

Here is the code I am running...

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Android :: Cannot Call Method Of View Object Inside Activity

Nov 7, 2010

In my program I have a custom view object. Inside the view class is a method called foo. For some reason when I call foo from my activity, it doesn't fire. Here is the code:

XML of the custom view:
<com.company.application.MyView android:id="@+id/my_view" android:layout_width="wrap_content" android:layout_height="wrap_content" />

The activity code:
public class Main extends Activity { MyView mView;
/** Called when the activity is first created. */
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); setContentView(R.layout.main);
LayoutInflater li = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = li.inflate(R.layout.main, null); mView= (MyView) v.findViewById(R.id.my_view);
//A button to fire the method inside foo() Button switchLeft = (Button) findViewById(R.id.switch_left); switchLeft.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { callTest(); } } );
} public void callTest() { Log.w(this.getClass().getName(), "clicked left arrow");
mView.foo(); mView.postInvalidate();
} }

Finally here is foo:
public void foo() { mBackground = mContext.getResources().getDrawable(R.drawable.temp_canvas); Log.w(this.getClass().getName(), "background set");
}

The first log is always written when the button is pressed, but the second log is not because foo never fires. What is the deal here? Upon request, the full view

public class MyView extends View { Drawable mBackground; Context mContext;
public MyView (Context context) { super(context); mContext = context;
mBackground = mContext.getResources().getDrawable(R.drawable.leftarrow1);
} public MyView (Context context, AttributeSet attrs) {
super(context, attrs); mContext = context;
mBackground = mContext.getResources().getDrawable(R.drawable.leftarrow1);
} public void foo() { mBackground = mContext.getResources().getDrawable(R.drawable.temp_canvas);
Log.w(this.getClass().getName(), "background set"); }
@Override public void onDraw(Canvas canvas) { Paint paint = new Paint();
paint.setStyle(Paint.Style.FILL); // draw a solid blue circle
paint.setColor(Color.BLUE); canvas.drawCircle(20, 20, 15, paint);
// draw a test background mBackground.setBounds(0, 0, 300, 400);
mBackground.draw(canvas); }
}

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Android :: Does An App Only Have One Context Object

Jul 19, 2010

I'm confused about the concept of the Context class. I see that it's a base class of Activity, but the Android docs also mentions the Context storing global information about the app environment. So in my app which has 3 activities, does that mean I have 3 distinct Context objects, or do they actually refer to 1 entity? Also, what is the lifetime of a Context object- does it live until the last component of this activity's process is garbage collected?

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Android :: How Can I Get Current Activity Object In Instrumentation Object?

Sep 9, 2009

I want to do some automated testcase with Instrumentation . Suggest that my AUT has 2 Activity. After clicking the button in ther first Activity, the second one will be shown with new content base on what we enter in the first Activity.) Instrumentation provides us the function called startActivitySync() and return the Activity object for processing. My question is how we can get the pointer of the second Activity after the it is shown by clicking the button on the first activity.?

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Android :: Singleton Object With Context?

Oct 10, 2010

I often run into the following dilemma: I need some singleton-like object in my app (typically some central manager-like thing) and this object needs a context for various things. This means that I either have to pass a context to all methods needing one or have some sort of init-pattern to the object. Neither is pretty I think. What is the correct way of doing this? Or is this simply (even the definition of) a Service?

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Android :: Lifetime Of An App's Context Object

Jul 19, 2010

What is the lifetime of an app's global android.content.Context object? Does it last until the last component of the app is terminated by the Android runtime?

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Android : Get Activity Object From Intent Object

Sep 21, 2009

I have an Activity that running on system. I can get the Intent that is used to start the activity. But i don't know how to get the Activity object from the Intent object or something else. Can anyone tell me how to do this??? Note that, I don't use Instrumentation object.

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Android :: How Can I Pass A Context Object To A Thread On Call?

May 12, 2010

I have this code fragment: Code...

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Android :: Get Shared Preferences / Static Reference To A Context Object

Oct 19, 2010

In my Android application, I have to call the getSharedPreferences in non-activity classes. In order to avoid passing a Context object to each constructor of these classes (and because many of them are classes with only static methods which don't have a constructor), I have implemented these steps : The main activity of my application (which is launched at startup) is called Dispatcher. In the onCreate method of this class, I keep a reference to the created Dispatcher object in a static public variable of the Dispatcher class which can be accessed from any class in the project.

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Android :: How To Clone View Object / Can Be Added To Current View Hierarchy?

Feb 28, 2010

I like to know how can i clone a view object which is already there in the view hierarchy, so that it can be added to the same view hierarchy again.

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Android :: Set Context To A View In Layout Xml

Sep 14, 2010

I am using WebView in an ActivityGroup and it will throw an exception if WebView show Dialog and complain the activity is not valid. But it's okay if I set the context of the WebView to the TOP activity. So I wish to know how to set the context in the layout xml ?

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Android :: How Can I A Context Menu Without Registering View

Aug 4, 2010

How can I open a context menu for a view without registering it using registerForContextMenu()?

My activity overrides onTouchEvent to detect motion, and if I use registerForContextMenu() it stops working. I'm detecting a long press, so I'd like to forward that request to a method that would build the menu for me, but don't know if it can work that way.

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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 :: Identifying View Selected In Context Menu

May 28, 2010

In Android, onContextItemSelected has a single MenuItem argument and so it isn't clear how to identify the view selected. MenuItem.getMenuInfo provides access to Contextmenu.ContextMenuInfo, but while both known subclasses provide access to the target view, there does not appear to be an accessor on the interface.One alternative is to save the View provided in onCreateContextMenu in a private class variable which relies on onCreateContextMenu not being called again in the activity before onContextItemSelected. Another is to use the id of the View for the itemId argument of ContextMenu.add. If we do this, we would then need to identify the option selected from the context menu by using its (possibly internationalised) title.what is the best method for identifying the View selected in onContextSelected?

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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 :: 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.

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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 :: Want To Set Focus To Xyz View Object Pro Grammatically

May 7, 2009

We see API for saying which is the next focusable view.. however during the event handling we want to set the focus to xyz view object pro grammatically . Is that possible.

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Android :: Create A 'View' Object From A Xml File?

Mar 9, 2009

In the Tab2 of TabActivity in the APIDemo example, it has this method to create a View object for each tab. code...

Can you please tell me how can I create a View for each tab from an xml layout file? For example code...

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Android :: Move A View Object In Circle?

Aug 7, 2009

I have a very simple requirement. I have a View object, lets say an ImageView object. I want to move this ImageView object in a circle.

More specifically, I want to move it along an arc, which is not a complete circle. I found in Android Documentation that comes with SDK that we can create a path from an arc but it does not mention how to use this path to make an animation that goes along that path.

Please note that I dont want to rotate the image. I have to move it in a circular path.

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Android :: Set Activity Object To Application?

Apr 26, 2009

When start the activity i will set the activity object to the Application, and i will registry it in the Appication app = MyApplication.getApplication(this);

1. Start Activity A store A id 0x12345678
2. Activity A -> Activity B
3. Store B id 0x87654321
4. Finish B activity
5. but the Activity B object not null in the Application

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Android :: Get KeguardScreenCallback Object In My Own Activity?

May 25, 2009

Is there someone could tell me how to get the KeguardScreenCallback object in my own Activity(For Example,the class of LockScreen,it has a parameter called "callback" in it's constructor,I want to get the "callback" in my activtity).so I can call the goToUnlcokScreen method to remove the screen lock.Or there maybe other way to do this?(I know KeyguardManager,so except this way first.

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Android :: Pass An Object From One Activity To Another?

Aug 28, 2009

I have an activity which implements an OnItemClickListener.code...

However, I need to pass some objects from MyActivity1 to MyActivity2 --

I see there is an Intent.putExtra() for all the basic types, and I even see a Bundle which is a collection of basic types, but how can I pass a generic "Object" to MyActivity2 ?

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Android : How To Pass Object From An Activity To Another

Oct 15, 2009

There is an activity which has an object. This activity(say A) starts another activity(say B). Can B use some object in A?

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Android :: Customize List View Context Menu Colors

Nov 15, 2010

I need to change the colors and/or style of the ContextMenu when I long press an item of a ListView.I've looked everywhere for an answer and cannot find anything related to ContextMenu customization.

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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.

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