Android : Purpose Of Using Intent.createChooser() In StartActivity()?
Sep 27, 2010
When ever we need to send an email in Android we will invoke registered email application using Intent.ACTION_SEND. like the below
Intent i = new Intent(Intent.ACTION_SEND);
startActivity(Intent.createChooser(i, "Send mail..."));
My doubt is why do we need to use Intent.createChooser in startActivity rather than using
startActivty(i).
Is there any specific reason of using Intent.createChooser()?
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Jan 16, 2010
Is it possible to show a list of applications (with intent.createChooser) that only show me my twitter apps on my phone (so htc peep (htc hero) or twitdroid). I have tried it with intent.settype("application/twitter") but it doesnt find any apps for twitter and only shows my mail apps.
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Jul 2, 2010
I've got an app that creates an intent for the last.fm android app in which it will start the "recommended" station for my account when i press a button. The trick i'm trying to figure out is how do i get the phone back to my app without the user having to navigate back manually? Once it start the last.fm intent it takes you to the playlist and i need it to resume back to my app automatically.
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Aug 10, 2010
MyService and MyClient are both running, although MyClient is currently in the background. If MyService sends an Intent to MyClient via:
CODE:..............
How do I get this Intent in MyClient? Running this code triggers onResume() in MyClient, but because it's already running, calling getIntent() returns the Intent that initially created MyClient, which is always android.intent.action.MAIN
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Jan 27, 2010
I am running into a critical conflict of sorts. My app is a remote service which essentially starts an activity when the screen goes to sleep. How it does this is very simple via screen off broadcast receiver and then an explicit intent to start the activity as a new task. The activity is basically in charge of responding to key events and displaying some simple text.
Thanks to a few window flags added in 2.0, activities can do this. They can be created in a way that either puts them on top of the lockscreen, or completely dismiss the lockscreen. This way they basically have focus without the lockscreen having to be dismissed by user. The alarm clock in 2.0 uses the flags to wake up the device and show the alarm dialog. I use them to place my activity when the screen sleeps so the user sees a custom wakeup lockscreen. The reason we create it at screen off is to get rid of lag the user experiences at wakeup involving first seeing the lockscreen, then seeing the activity appear. Also doing it immediately at sleep allows it to have focus so it can handle key events effectively.
The process works perfectly except in certain apps. So far, it seems the bug is consistent while browser (and even dolphin browser) as well as the facebook app are running. The bug never happens in GTalk or Launcher. It is rare but can still be duplicated in the messaging app every so often. I can't figure out why my activity doesn't get created at sleep while these apps are active. My remote service still gets the screen off broadcast and does the startActivity for the explicit intent, and that's all I get in the log. My onCreate is not being called. Instead it gets called when we wake the screen up again.
I have tried, as a control, to hold the partial wakelock starting when my remote service gets created, and the issue persists. So I don't believe it is a problem that the CPU has gone to sleep. Since only these particular apps cause the issue to duplicate, I can't imagine why the activity start fails. What could those apps be doing to interfere with another app's ability to get created? I use singleInstance as the launch mode so that I can ensure that the activity will never be able to be recalled by user process. I want it to go away when user unlocks and it is working fine like this, as long as it is able to be created. The singleInstance ensures I can have the same lockscreen handle an intent to do something specific based on user actions that the remote service monitors.
my source code can be viewed on my project page. http://code.google.com/p/mylockforandroid/source/browse/#svn/trunk/myLock/src/i4nc4mp/myLock
The issue happens to both my CustomLockService and NoLockService variations. These two services will start Lockscreen or ShowWhenLockedActivity and the bug is witnessed. The build illustrating the bug's end result-- user has to try to unlock 3 times due to the bug because on wakeup when the oncreate finally succeeds, user is seeing the activity when normally it would have auto-dismissed thanks to key event logic that also isn't seeming to happen due to the delayed onCreate, so they have to send it to sleep again. Now that the activity is properly done being started, and screen is asleep, the expected functionality happens at next wakeup-- can be downloaded also from the downloads tab.
This seems like an extremely irrational thing to be caused only by specific apps. I am quite baffled and out of ideas for a solution unless I've made some critical mistake in my activity definitions.
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Sep 13, 2010
I am having two activities, say activity A and B. Activity A is an ListActivity, and when the items in the list is selected, it will call startActivity() to bring up B. The problem here is that when I am in B and click the home key, and then go to the application launcher to resume my application, A will be brought up again. This time when I click a different item in A, it will bring up B with the old data of the previously selected item before the home key was clicked.
After examinzing the code, I found that the startActivity does not update the intent of B. I found a post here about the similar question, and the answer was to overwrite the onNewIntent. However, I found that it doesn't work, because this method never get called when the second time I call startActivity. I am sure that this is the same instance, because I've printed out the instance number. Is there any other ways to update the intent of the activity? Or I need some other settings to make the onNewIntent get called? I didn't set any flags or launch modes, so everything is default.
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Oct 17, 2010
My app works with pictures. It can take multiple pictures as an input, process them, and send them again to another app.
As a consequence, my main Activity has declared an intent filter on ACTION_SEND_MULTIPLE for image/* mimetypes and can result in issuing a new Intent with the same action and data type using Activity.startActivity(Intent).
Is there a way to exclude my own activity from the list of apps that is displayed to the user after the startActivity() call ?
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Jul 20, 2010
I have a code that will prompt user to send a message by selecting the desired application, how can I detect if the user actually have chose from the options or instead pressed Back? I tried to check if the intent returned something, but is running asyncronous so cannot be tracked. Also I have tried to run the intent with startActivityForResult, what I noticed in onActivityResult that resultCode is always 0(RESULT_CANCELED) even if user selected, or not from the chooser.
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Jul 8, 2010
What is the purpose of this?
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Nov 10, 2010
iFMW was upgraded: Mobile site for public person or private file share for secret person in one app.
It has two inversion functions on one app.
Public person can get his/her own public web site on the phone and secret person can use only private file sharing directly on the phone without uploading.
Those who want two demands above will use whole functions.
What will you choose of those choices?
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Oct 13, 2010
What is translatable attribute translatable="false" means?
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Oct 7, 2010
What is meant by System.img in Android? What is the purpose of using it?
Can anyone help me regarding this issue?
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Sep 30, 2009
My questions is already on the title of this post ^^
Does anyone know what are libdrm1.so and libdrm1_jni.so purpose?
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Aug 23, 2010
I'm reading the android source code, and wanna make orientation animation. I've found that when I rotate the screen, the code will be executed to public boolean setRotationUncheckedLocked(int rotation, int animFlags){}, in which there's a line startFreezingDisplayLocked(). If this method works, there's no animation when I rotate the screen. Thus, I wanna know whether Google forbid orientation animation on purpose, and if I wanna make an animation, whether just use stopFreezingDisplayLocked() instead? Thanks a lot.
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Aug 7, 2010
I'm writing a JNI library for a game. I have java code that I want to replace with functions from the library. Is it true that most of the devices out there are compatible with my code if I compile it for the default arm processor, or will I find that there are many devices out there that my library won't run on? What I'm asking is, should I maintain java code that does the same thing as my jni library for compatibility purposes, or is it safe to have jni libraries alone? How large is the group of devices that cannot use the libraries I write? Where are there stats regarding what population is using processors other than the arm processors?
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Nov 10, 2009
Is there an application or combination of apps that serve a purpose similar to all the uses of MyPhone?
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Nov 16, 2010
I want to capture Intents with a specific Uri pattern that uses the http scheme. I DO NOT want the chooser dialog to pop up. The Android API advertises filtering of intents based on pattern matching of the path part of the Uri:http://developer.android.com /guide/topics /manifest/data-element.html However, when I try to specify a pattern for my path other than ".*" (which pops up the chooser, which I'm trying to avoid), it doesn't work, and the browser automatically handles the Intent. So, my question is, what is the purpose of the pathPattern/pathPrefix if, for the http scheme, it either auto resolves to the browser, or pops up the chooser anyways?
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Aug 19, 2010
So under menu, accts and sync I have twitter for htc sense, facebook for htc sence, twitter, weather and stocks. Why are they there...i also have facebook for android installed that pushes data...along with sep twitter app. Not sure what purpose this plays.
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Apr 7, 2009
My use case is to launch one of settings app screen when I receive a certain event in idle state. For which, I added my new intent to PhoneAppBroadcastReceiver() in PhoneApp.java (looks like this receiver handles the misc intents) But when i call startActivity(), The phone seems to go into a panic ex. startActivity(new Intent(this, NetworkSetting.class)); My questions are is this the right approach to go about ? If so 1. How can I launch the activity inside of broadcastReceiver? secondly 2. How do i verify if the activity i want to start is already started?Can the NEW_TASK_LAUNCH be used to verify this ,
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Nov 23, 2009
I have splitted my Android project in 2 packages, lets say: test.current and test.another. From an activity in test.current I want to start an activity in the package test.another
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Jul 15, 2010
Why should I use startActivity() in a Service? If I need an Activity a have to call an activity and if I need a "delayed activity" I have to use the notification. So, why should I use startActivity()?
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Jul 22, 2010
I'm new in Android development and I've a problem when I create my new activity.I want to use my activity before start it. For example, But, my "menu" and "MyActivity.class" aren't the same instance.
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Jun 29, 2009
According to the doc, if the intent in startActivity(intent) is not found, there will be an exception raised. Therefore I use a try/catch block. However, even if I use a random string as the intent, the promised exception does not occur.Instead I see a dialog that says: "No application can perform this function". I also get the same dialog if the intent is valid (picked up by an app) but apparently doesn't want to act when the extras are not what the app expects (e.g. my earlier question about Intent.ACTION_SEND and mime types). I am using the 1.5_r2 SDK on an AVD running 1.5, with the app running at version 1.1 (sdk=2). Is this a doc error, a bug or am I misunderstanding something? Can I simply delete the try/catch block?
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May 15, 2009
I have a Activity and I have a class which extends this Activity. In this subclass I call:
startActivity(new Intent(this, CameraView.class))
Which should start the "CameraView" Activity. However, I always get this error:
CODE:...........
If it makes any difference the subclass creates a ListView and when a row of the ListView is clicked it calls startActivity();
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Dec 7, 2009
I have a TabActivity subclass that attempts to start a new activity via a menu item selection in onOptionsItemSelected.I am receiving the following exception which eludes me at the moment.I'm not sure why it thinks I am *not* in an activity!
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Apr 7, 2009
I'd like to launch one of settings app screen when I received a certain event in idle state. For that, I added my new intent to PhoneAppBroadcastReceiver() in PhoneApp.java (because it seems this receiver handles the misc intents) But if I called startActivity(), seems phone goes to panic. ex. startActivity(new Intent(this, NetworkSetting.class));
1. How can I launch the activity inside of bradcastreceiver?
2. If the activity which I want to start is already started, how can I check it? I read can use NEW_TASK_LAUNCH but don't know how to use it. If you have a sample code, could you post it?
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Mar 3, 2009
what is the scenario that makes me to pick between startActivity and startSubActivity
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Apr 20, 2009
What's the correct way to pass a bundle to the activity that is being launched from the current one? Shared properties?
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Sep 28, 2010
Is there any event triggered on an activity when I call startActivity("activity_id", myIntent);
If the Activity exists already. I pass a parameter to the activity via i.putExtra("someID", someSerializableObject ); and would like to call a method to refresh a WebView. Right now, the call on startActivity brings the activity in the foreground but the webview does not display what i want.
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Nov 24, 2010
I have one subclass which extends Dialog class, it seems I can not use startActivity() function to start a new Activity in this subclass which extends Dialog class, how to resolve it?
How to start a new Activity in a Dialog subclass? (In my customized dialog subclass, I have one button, when pressed, I would like to have a new Activity start).
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