I have custom view and once some action occur in it (say touch/key event) I'd like to call some code in my activity. My question is if broadcasts (intent filters/broadcast receivers) are good communication mechanism for such thing? If not, what is normal/android preferred way to do it?
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Is there any way to query a root view of an activity for all of its child views even before the root view or its children have been inflated? I guess what I'm looking for is whether a view knows ahead of time what children it will have before it gets inflated, and can I get that list in some way. Bizarre I realize, but I think it will help me with some unconventional automation testing I'm working on. I haven't found anything in the API like this.
View 1 Replies View RelatedI am trying to figure out the best practice of communication between a TabActivity and the child activity embedded in this TabActivity.
In my TabActivity, there is a button. When the button is clicked, I want the child activity embedded in this TabActivity to be updated. I wrote the code like below, and just wonder whether it is a good practice.
CODE:..................
Here's the deal: I have an Android application that needs to call a web service every X seconds (currently 60 seconds). This application has multiple tabs and these tabs all need to interact with the data themselves. One is a MapView, one is a ListView and then the third is irrelevant but will need to also get some global data eventually. The issue is that I want my main activity to have a thread that runs in the background, gets the results and then instructs both child activities in the TabHost to update themselves with the latest data. Also, when the user clicks on the tabs and the onCreate/onResume activities fire, I would also like to force a redraw by getting the latest data from the main activity. I'm really at a loss here. I've tried this with a service and some ghetto static methods to pass an instance of the Activities to the Service to call specific functions to update their views whenever the timer fired, but the slowdowns were pretty bad and the code was just ugly ugly ugly.
So I implemented it as a timer-driven thread in the tabhost activity and then I have timer-driven threads in each child activity that then grab the data (in a synchronized fashion) and update their map/list. It's much faster but still feels slightly hack-ish, especially the part where I'm calling a custom function in the parent activity like so:
((MainActivity)getParent()).getNearbyMatches();
This adds an element of strong coupling that I'm not entirely thrilled with, but from a performance standpoint it's much better than it was. I appreciate the answers that have already been given and will do a bit of research on the content provider front but I'm not sure I want to go back to the service model.
I'm working on establishing a two-way communication between an Activity and a Service which runs in a different process.
Querying the process from the Activity is no big deal. But I want the process to notify the Activity on events. The idea behind it is this: the service runs independently from the actual app. It queries a webserver periodically. If a new task is found on the webserver the process should notify the activity.
I found this thread over at AndDev.org but it doesn't seem to work for me. I've been messing around with BroadcastReceiver. I've implemented an interface which should notify the Activity but the problem is that the listener is always null since the Broadcast from the process is done via Intent, hence the class that extends BroadcastReceiver will be newly instantiated.
How can I establish a 2-way communication? This has to be possible.
am not too experienced in android and i am just using the TabActivity, so please bear with me. i keep seeing post about not using activites in Tabhost but views. and am not sure which is which and if thats the reason of my latest headache? i have a code with 4 tabs like this:
// Category TabActivity class
tab.setContent(new Intent(this, Mylist.class));
tab1.setContent(new Intent(this, Mylist.class));
tab2.setContent(new Intent(this, Mylist.class));
and each tab is showing the result of a method in the Mylist Activity.is that using an activity in a tab or displaying a view? whats the difference?.i have a context menu on an item selected in the Mylist Activity which updates the list. how can i reflect the changes in the list back to the tab in other to display that particular method in the Mylist class, that was set as the tabs content. obviously this will change if i updated or deleted an item from the list when the tab is shown. i think its possible with onResume(), but don't know what to call there or is there any better way?in the Mylist class, i have tried this little piece of code to restart the TabActivity:myAdapter.deleteItem(id);
fillData(); //
Intent refereshCategory = new Intent(this, Category.class);
startActivity(refereshCategory);
its restarting the activity after the item have been deleted, but how can i only show the tab whose view was in focus when it restarts and i don't want fillData() method to be shown as it does not have to do with the tabs. i hope i made myself clear enough
I have the instance to my activity, and I want to get all the views that are in this activity. I need to add a listener to each view, for any activity. That means I can't user findViewById. Is there any way to do this? I was hoping for a activity.getViews() or something, but it doesn't exist.
View 4 Replies View RelatedIs there a way to get every view that is inside my activity? I have over 200 views including buttons, and images, so i want to be able to access them by using a loop.
View 1 Replies View Relatedi have created some xml layout: 1- toplayout.xml 2- botlayout.cml 3- middlelayout.xml now i can only set one view as in setContentView(R.layout.toplayout); please advise how can i show all three views in my activity?
View 2 Replies View RelatedI simply want to create a ListView above this webview (covering it up...but sitll allowing the webview to run). I could toggle the views on and off.
View 2 Replies View RelatedI am new to android.I have a list view in one activity. Displaying data in it... I want to use another activity as a tab-bar for 1st activity which allow user to switch to other activity... Is there any way so that 2 different views can be displayed in 1 activity. And then how can i start a new activity inside this activity. Like when user click on any button in tab-bar the corresponding activity should be start but we should not Re-initiate tab-bar view...
View 1 Replies View RelatedI have a simple ListView and on that ListView I have placed a number of custom defined Views. The CustomView has ImageView and two TextViews.
The CustomView also has a "stateful drawable" as background, so that the background image (a 9-patch) changes if you press the Row in the ListView. When pressing the Row, the background image changes to a Red-ish thing.
The problem is that when the background changes from the default greyish, all the Views in the CustomView (ImageView and TextViews) still have their greyish background and thus creates very ugly greay boxes on top of the now redish background.
What is the best way to solve that problem? I hoped that such things were handled automatically (as it is done in for example .NET), but I was wrong it seems.
My application opens in Activity A1. None of the views in A1 are focused at startup, until I use the arrow keys to navigate through the views. A button press in A1 launches activity A2. When A2 opens, the first Button in A2 is focused by default. I do not want this happen. What I want is when A2 opens, none of the buttons are focused until arrow keys are used to naviagte through them(just like it is in A1).
View 1 Replies View RelatedIs it possible to add a view dynamically that overlaps other views in the layout. I have Linear Layout defined for the activity. As part of the Layout I have a custom View. The content changes dynamically and sizes appropriately based on the content size, with fill_parent for width and wrap_content for height. But what I want is, dynamically take over the full screen and then based on a click go back to the normal mode. Is there a mode to display a view where - in it can overlap all other views in the layout?
View 3 Replies View RelatedIs there a way to read the points created when drawing a path? It seems silly to me that a path cannot be readable.Or is it just better to manually write the current finger position to an array?
View 1 Replies View RelatedI want to get the size of a view that is in my activity but I am not able to get that information in any of the activity lifecycle callbacks (onCreate, onStart, onResume). I'm assuming this is because the views have not been drawn yet. At what point are views drawn and is there a callback I can put my code so I can get the size of the view?
View 2 Replies View RelatedBasically what I am trying to accomplish is I want a canvas I can pass bitmaps to, to be displayed on the screen with the rest of my view objects (buttons, textviews, etc).
View 1 Replies View RelatedI have an activity called A, and on the selection of menu item 0, it spawns service B, which starts a runnable C in a new thread. I have a TextView in activity A, which I want to access in thread C.
I've tried making the TextView a public static field, but that generates the following error:...........................
I am implementing a music player application in Android. My play list selection screen is implemented as a tab selector widget which contains a ListActivity inside each of the tabs: Artist, Albums, Songs.
I want to update the ListView in each of the ListActivity when I delete an item from any of the lists.
i.e. When I long press an item in the Artists list a context menu is drawn with "Delete Artist"
And it should delete all the songs from this artist in the Songs ListView, delete all the albums by this artist in the Albums ListView, and finally delete the entry for the artist in the Artist ListView.
Each of the ListActivity has its own fillData() method, which updates the ListView when the button in the context menu is pressed.
How can I call the fillData() method of the Albums ListActivity after I update the ListView inside of the Artists ListActivity?
I want to know whenever someone is called, calls, smsed or smses. I figured for the calls I'd use the phone state change to trigger when I should check the CallLog provider again. I couldn't see any direct way of getting broadcasts from the CallLog. Did I miss it?
For SMSes I'm having more trouble. I'd like to know whenever and SMS is sent or received. Being able to receive STATUS_ON_SIM_READ and STATUS_ON_SIM_SENT would be great, but from what I've read in the Sms Manager that would depend on the sending application. I can't seem to find any evidence of a default one that android places when it sends. I also couldn't find an sms log provider or anything similar.
I want to populate a table, defined in layout xml file through the programmatic way. I have define Table with a single row defining its header, with all the attributes set. Now i want to know a way so that i can just replicate that header row in the table with new content.
I tried using inflator inflate(int,view) method, but at runtime it showed up with error.
Here is the XML code for the layout file defining the table
CODE:.................
I have the following XML code:.................
The idea is to change the views, whenever I press one of the radio buttons. When I press a button the first time everything works out fine, but the second time I press a button, I get an IllegalStateException, and I can't quite see why I'm getting this.
Also, the Activity seems to set all my global variables to null, which is why I have to create them every time I switch from portrait to landscape or vice versa. So I would like to know if there is a way I can save my views in the Bundle, or any other way in which I can permanently save my views, so I don't have to add or create them every time, I flip the phone. And whenever I flip the phone, it seems that it rereads the main XML file, causing the RadioGroup to be set to 2D even if the 3D button is checked. This is because I've said the 2D button to be checked from when the app is first created, but I would like to also save the state of that RadioGroup.
App A has this Broadcast Receiver in its manifest (within <application>): Code...
View 1 Replies View RelatedHow can I catch SCREEN_ON/SCREEN_OFF broadcasts? I have tried for hours, but failed.
View 10 Replies View RelatedAre there design guidelines to help decide if an application with multiple views should be designed with multiple activities or just one activity and control the back button itself.
I've tried both. My most complex applications using one activity per screen. However, now that I'm successfully written an app with just one activity and handling the back button myself, I don't see any compelling reason to use multiple activities. The one activity application is much simpler and more straightforward.
What advantages of multiple activities am I missing?
How do you align views relative to the "middle" part of another view? I think it is best explained with a pic of the UI I'm trying to create in android.
View 2 Replies View RelatedI am trying to get the intent "android.intent.action.BOOT_COMPLETED" sent only to the receiver "com.android.mms.transaction.MmsSystemEventReceiver" as this triggers the sms notification to be updated and removed if there is no longer any unread sms's. The issue I have is I need to make sure the broadcast is only sent to the class above. If it goes to other receivers the phone could end up in an unknown state or something strange. The code below does not seem to work.
Intent intent = new Intent(); intent.setAction("android.intent.action.BOOT_COMPLETED");
intent.setClassName("com.android.mms", ".transaction.MmsSystemEventReceiver");
activity.sendBroadcast(intent);
This code does work but since it goes to all receivers I have noticed some errors starting to show up in logs etc.
Intent intent = new Intent();
intent.setAction("android.intent.action.BOOT_COMPLETED");
activity.sendBroadcast(intent);
I have started developing a tool, which should react on an outgoing call or sms and also to be started at boot time. The start at boot time does work properly, but I'm not able to receive the broadcasts for the outgoing calls.
Who can tell me, what is wrong with my code? For this, I added two receivers in my manifest and implemented the broadcast receivers:
manifest.xml: <receiver android:enabled="true" android:name=".BootUpReceiver"
android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
<intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.DEFAULT" /> </intent-filter> </receiver>
<receiver android:name=".TelephoneViewer" android:enabled="true" android:exported="true"
android:permission=""> <intent-filter> <action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
<action android:name="android.intent.action.PHONE_STATE" />
<action android:name="android.intent.action.NEW_OUTGOING_CALL" />
</intent-filter> </receiver>
TelephoneViewer.java: public class TelephoneViewer extends BroadcastReceiver {
@Override public void onReceive(Context context, Intent intent) {
Log.d(this.getClass().getSimpleName(), "Telephoneviewer.onReceive()");
Toast.makeText(context,"TelephoneViewer.onReceive()", Toast.LENGTH_SHORT).show(); }
I have two applications, one of which (B) implements a broadcast receiver. The application (A) which sends the broadcast, binds a permission to it which the receiver (B) shall possess. The problem is now: If I install the receiver (B) first and the sender (A) afterwards, the receiver will never receive the broadcast. I assume this happens because the installation of the receiver somewhere fails when it comes to the "uses permission" part of the manifest (because this permission is not yet registered/defined).
However, this issue should be resolved as soon as the sender (which defines the permission in the manifest) is installed, but unfortunately isn't. It does not even help to re-install the receiver. The only way to resolve the issue is to completely uninstall the receiver application and do a fresh install. Is this behaviour intended ("not a bug, a feature")?
Does the Alarm Clock broadcast any intents? I would like to be able to have my application automatically launch after a person's alarm clock goes off, and they press "dismiss" (rather than "sleep"). I assume that would require a receiver looking for a broadcast of some kind.
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