If I want to send an event, e.g. OnClick, to an activity from a thread? The expected work flow is below:public class HelloAndroid extends Activity {public void onCreate(Bundle savedInstanceState)Code...
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I am developing an input method with full screen size views, How can I send a grabbed motion event to the client applications?
View 2 Replies View RelatedMy Activity using transparent Theme in AndroidManifest.xml *android:theme="@android:style/Theme.Translucent"* Which works fine. When it's started from the Home screen, we can see both the content of my activity and the home screen below it. It gives the feeling of "floating". Furthermore, to make it real "floating", the motionEvent has to go down to the home screen to let the home screen response some motion touch. But I have no idea of 2 things : 1. Whether the event can be send down to any thing behind the current activity. 2. If so, how. The solution don't need to be restricted in API level.I mean if any solution need us to rewrite home screen or something else, It's also ok for me.
View 10 Replies View RelatedI have two activities. The first activity display list of the users with short info. And after select some user I go to the second activity for display full info about this user. For send event I used startActivityForResult(); for receive event in socond activity and added public void onActivityResult(int requestCode, int resultCode, Intent data). After start project I send intend from first activity and I do not receive in the second : How I can receive sent event in second activity.
View 1 Replies View RelatedIm working on a small application to try out an idea that I have. The idea is to periodically update the UI when event of some sort occurs. In the demo I've created, I'm updating a ProgressDialog every 2 seconds for 15 turns. The problem I am having, which I don't quite understand is that when an event is handled, I send a message to the handler which is supposed to update the message in the ProgressDialog. When this happens however, I get an exception which states that I can't update the UI from that thread.Am I missing something? The logic makes sense to me and it looks like everything should work, I'm using a handler to update the UI like it is recommended.
View 1 Replies View RelatedOn what thread are event handlers (like onAnimationEnd, onTouchEvent, onKeyEvent, onClick) executed? Are they called sequentially or can two handlers may execute simultaneously?
View 1 Replies View RelatedCan I send an email without invoking any activity (with Send/SendTo action)? Just compose a mail and send to recipient from my application.
View 7 Replies View RelatedI want to keep launching my app and stress test two scenarios: launch it and press BACK key launch it and press MENU key I can launch from adb using "am" command. But how can I send a BACK or MENU key using adb. I want to do thousands of rounds of testing so I don't want to do it manually.
View 2 Replies View RelatedI was looking 2 weeks ago for sending back and home key events when on Click is performed on a Image Button, I could do that perfectly. I have a device with no buttons. So, I want to simulate Menu button click. To know what is really happening, I implemented a code in on Create Options Menu that rises a Null Pointer Exception. I got the following stack trace. code...
View 21 Replies View RelatedI know that the apps receive a ACTION_SHUTDOWN broadcast event when the device is shutting down.
When an application receives the shutdown, is there still an opportunity to send data packets out, or does android block such attempts(or does the platform tear down the network stack before it can go out).
Code...
This code don't work
Do we get any event in the Activity when the activity gets resized? like when Virtual keyboard appears on the screen.
View 4 Replies View RelatedI have a service from which a start a new thread. This new thread will communicate with a TCP server using socket. What is the best way to send the data received from TCP server back to the service? Handlers or something else?
View 1 Replies View RelatedI have created ListActivity of images i want touch event just like onItemClickListner how can i do it? i'm not finding any on Item Toch Listener.
View 2 Replies View RelatedI would like to make my activity do something when user clicked the title bar. But I could not find any information about how to manipulate the title bar. Please kindly give me some advices.
View 9 Replies View RelatedI have created a list activity where i have placed some items and i am using OnListItemClick to get the desired actions through D-pad and KeyLeft and KeyRight Buttons, In Emulator TouchEvent is not working , I want to know whether it works in real Handsets? How can i enable the TOuchEvent? also Can anyone please help me out in this.
View 2 Replies View RelatedIn my app, I want a functionality to create calendar event. I open "new calendar event" activity like this:
CODE:.................
It works perfectly on stock Android. On HTC Sense, I have only one issue - end time is not set correctly, it's always one hour after begin time.
I want to call the activity when user pull down the notification and click on that notification...how can i do that?
View 2 Replies View RelatedIn Virgil Dobjanschi's talk, "Developing Android REST client applications" (link here), he said a few things that took me by surprise. Including:
Don't run http queries in threads spawned by your activities. Instead, communicate with a service to do them, and store the information in a ContentProvider.
Use a ContentObserver to be notified of changes.
Always perform long running tasks in a Service, never in your Activity.
Stop your Service when you're done with it.
I understand that he was talking about a REST API, but I'm trying to make it fit with some other ideas I've had for apps. One of APIs I've been using uses long-polling for their chat interface. There is a loop http queries, most of which will time out. This means that, as long as the app hasn't been killed by the OS, or the user hasn't specifically turned off the chat feature, I'll never be done with the Service, and it will stay open forever. This seems less than optimal.
Long question short:
For a chat application that uses long polling to simulate push and immediate response, is it still best practice to use a Service to perform the HTTP queries, and store the information in a ContentProvider?
My problem is: Activity A called Activity B, and in Activity B, it start a background thread to do some client-server work. But it maybe takes too much time. So i add a cancel button to call the stop() method to stop the thread, and call finish() to finish the Activity B and go back to Activity A. Although it is back to Activity A, the thread isn't stop immediately. Can i just call the finish() to go back to Activity A, and leave the thread to exit by itself? If it is not the right way, which is?
View 10 Replies View RelatedI am want to pass data back from a Thread to Activity (which created the thread). So I am doing like described on Android documentation.Only one thing I am missing here - where and how should be defined mResults so I could access it from both Activity and Thread, and also would be able to modify as needed? If I define it as final in MyActivity, I can't change it anymore in Thread - as it is shown in example.
View 1 Replies View RelatedI have some questions about android ui api.
Give a example, that I want to implement.
Main_UI_Thread.java. code...
I know the message passing can be do that;
But I want the ui program is be implemented in DisplayClass.java. Is it possible?
How can I kill Android activity from asynchronous thread? In my android application, I start another activity using startActivity. Is there anyway for me to kill that activity I started after several minutes?Or is there any way beside using thread?
View 2 Replies View RelatedSuppose my activity ui-thread spawns a separate thread at some point. Is it safe for that new thread to fire off an Intent for launching a new activity?
View 1 Replies View Relatedcan someone please help me? I would like to write a program which uses a service to periodically update a text view on an activity. I do this by having ActivityA with a 2 buttons to start/stop my service. In the service I run a timer which triggers every second. From here I need to have this launch and update a text view on ActivityB which at present is just a counter value.I'm sure there are likely better ways to do this, such as using only one activity, maybe using a thread but the main design consideration is to have the service running even if my activity is destoyed (the counter value would instead go trigger some alarm or file write instead of a text view update). Sorry for rambling. I find the android developer resources offer too many solutions!
View 2 Replies View RelatedI have two activities:
"a" that spawns thread for generating a dynamic array of values inside public void run() function.
"b", graphics activity that will help me draw rectangular pulses based on array values calculated in activity "a" (calculated in a's thread to be precise).
When I am in thread inside "a", how do I pass values of array to activity "b" and
call activity as well.
activity A
CODE:..........
activity B
CODE:..............
I'm trying to think of a way on how to sync in between a local service and the main activity.
The local service has,
A thread with a socket connection that could receive data at any time.
A list/array with data.
At any time the socket could receive data and add it to the list.
The activity needs to display this data. So when the activity starts up it needs to attach or start the local service and fetch the list. It also needs to be notified if the list is updated.
I think I would need to sync my list somehow so the local service does not add a new entry to it while the activity fetches the list when connecting to the service.
I try to make several connection in a class and update the multiple progressbar in the main screen. But I've got the following error trying to use thread in android : Code: 05-06 13:13:11.092: ERROR/ConnectionManager(22854): ERROR:Can't create handler inside thread that has not called Looper.prepare() Here is a small part of my code in the main Activity.
public class Act_Main extends ListActivity
{ private ConnectionManager cm;
public void onCreate(Bundle savedInstanceState)
{ super.onCreate(savedInstanceState);
// Set up the window layout
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.main);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title); }
public void startConnection() { ......
I'm writing a bitmap editor and I'm trying to write an autosave feature. When onPause is called, I write the application state to an autosave file. As this takes between 0.1s and 1.5s, I've been advised this IO operation be performed in a background thread.
In the onCreate method of my activity, I check to see if the autosave file exists and, if it does, I open it.
Are there any scenarios I have to consider where the user can somehow leave the activity, the autosave thread starts and the user can return to the activity before the thread has finished? If so, how can I detect this and wait for the thread to finish before I check the state of the autosave file?
I was going to make it that, when the user backs out of my activity, they're asked to wait a second while the data is saved. This seems OK, but I can't do this when my activity is interrupted by something like a phone call.
Also, I'm a bit confused about how multiple versions of the same activity can be started as this makes dealing with autosaving more complex. Is there a way to make sure only one instance of my activity is allowed to run at a time?
A new question about android and services. Currently I'm developing a App that should send images to a server. It should also be possible to send more images parallel. I made a service that creates for every image a new image. The activity can bind to that service and gather information about the progress. I want to show the current status for every image in a notification (and when the user clicks a notification, an activity with the progress for that image should be shown). But I get several problems with that approach. There are errors with binding, the notification pending event starts the activity completely new, so I lose information about currently sending images and so on. How I could design in a appropriate way.
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