Android :: How The Use Same Instances When Launching Application Twice
Apr 14, 2009
My app has 4 activities on the stack A->B->C->D (top)
If you press home and re-enter the application, another instance of A is started, so the stack is A->B->C->D->A (top). I know this because when I press BACK, A is popped off and I now see D (instead of going to the Home screen).
What I want is that when the user re-enters the app, they re-enter on the same activity they were in before (D).
CODE:................
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Mar 17, 2009
Is it possible to re-use all the instances of Activities and Services when an application is launched twice. For instance: 1/ I start my application APP1. Some activities are launched and a service is started. 2/ I click "Home" device button 3/ I can see the icon the launch again my application APP1 4/ I click on it and the APP1 is launched twice
I would like to re-use the existing the instances of Activities and Services from the first launch. I guess it is related to "SingleTop" or "SingleTask" but it doesn't seem to work.
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Feb 28, 2009
How to i do to launch 2 instances of the Emulator at the same time?
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Jul 22, 2009
I need to correctly be able to differentiate between emulator instances. I know it's easily done with real devices. With real devices, you can use getDeviceId or getLine1Number from TelephonyManager. With emulators, all the instances have the same device id, same subscriber id, and same line1 number. Is there a way to differentiate them? Using NetworkInfo, I can call the toString method and I get my ip and the port on the computer. The problem with that is that the port is always different. I would like something more stable. Like when you use "adb devices" in command line. Emulator #1 is almost always "emulator-5556" and emulator#2 is almost always "emulator-5554". Is there a way to get the same info I get from "adb devices" in my code? If not, is it possible to use a command line parameter to force the emulator to use a certain phone number?
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Oct 23, 2009
Until recently, our app shared a single Apache HttpClient instance using the ThreadSafeClientConnManager across the whole application. The http client instance was held by a singleton class.
Since I dislike the singleton pattern for its numerous problems, I refactored our API accessor to be a per-thread object, but now for every thread (which mostly means per Activity/Service in our case) a new HttpClient instance is created.
It's not that I have problems with this new approach, but I've read that the Apache folks suggest to only have one instance per app for performance reasons.
Visually, what we did before was this:
HttpClient (thread safe)
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Activity1...ActivityN
Now, we do this:
Activity1 ... ActivityN
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HttpClient1 HttpClientN
How do you guys do this in your applications? If you share one single HttpClient across your app and potentially many concurrent threads, how do you handle access to it?
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Jan 6, 2010
I want to launch another application through the current application.
In RIM there is a "ApplicationManager.getApplicationManager().launch("String path")" method that launches directly RIM application mentioned in "String path".
Is there any method like this in android or any other way to solve this problem ?
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Jun 1, 2009
Say I have developed 4 applications. Is it possible to group these applications, so that I can access and launch these from one location?
Can the below flow work? Start an Application|Display launchers(icons) for 4 different applications|On click of the icon start the respective application.
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Mar 29, 2010
I have written an application which calls native methods through JNI. In the native library 4 threads are started. On USB removal, the application is to be closed including the native threads. Upon receiving the USB removal event, we are trying to kill the threads (pthread_kill() ) and then finish (using finish()) the activity. After reconnecting the USB, the application is not launching due to memory corruption. In DDMS, it shows the threads are still attached to bionic. As the threads are not closed, I feel the resources were not released properly. If I reconnect again then application launches and works fine and the same repeats on every launch.
To solve this problem Can I use System.gc() ? Can I use pthread_exit() 1st and then pthread_join instead of pthread_kill ? Whats the procedure in Android to kill the native threads and also the application ? After the application is closed, will it not be listed in DDMS ?
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Sep 30, 2010
I want to launch my application in market. I ahd go to http://market.android.com/publish/signup but there they are asking for Website URL. But i don't have any website then what should I enter there? or is it necessary to have our own website to launch application in market?
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Nov 9, 2009
Is it possible to launch an app widget from another application.
For example, I have a button in an application. When I click on that button, an appwidget must be launched.
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Dec 29, 2009
I would like to launch an app the user selects from within my application. However, I'm not sure how I'd go about doing this. I've tried this:
Intent intent = new Intent();
intent.setAction(Contacts.Intents.SHOW_OR_CREATE_CONTACT);
startActivity(intent);
But this seems to throw an error and force close my application. I also tried adding:
<action android:name="Contacts.Intents.SHOW_OR_CREATE_CONTACT"/>
in the AndroidManifest file, but to no avail.
A look at Logcat shows that it's an "IOexception - no such file or directory". A couple of questions arise from this. I read through the Android docs and noticed that the Contact.Intents class is deprecated. However, it's successor, ContactContracts is aimed at API level 5 whereas I'm targeting API level 3. Could this be the problem? Also, I've hardcoded this application into the code. Is there a way to retrieve the intents of any application the user selects so that they can be launched?
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Oct 13, 2010
I want to launch an application in the phone by clicking its link in the browser..
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May 22, 2010
I am trying to launch another application from my Activity. Something weird happens when I am running this code :
Intent myIntent = new Intent( Intent.ACTION_MAIN, null );
myIntent.addCategory( Intent.CATEGORY_LAUNCHER );
myIntent.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED );
ComponentName compName=new ComponentName(myArray[i][0], myArray[i] [1] );
// String[][] myArray myIntent.setComponent( compName ); startActivity( myIntent );
I have this error :
android.content.ActivityNotFoundException: Unable to find explicit activity class { com.android.settings/com.android.settings.Settings};
Have you declared this activity in your AndroidManifest.xml?
But when I replace this line
// myArray[i][0] = "com.android.settings" // myArray[i][1] = "com.android.settings.Settings" ComponentName compName=new ComponentName(myArray[i][0], myArray[i] [1] );
with ComponentName compName=new ComponentName("com.android.settings","com.android.settings.Settings");
And without any modification in my manifest, it works!
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Oct 3, 2010
I am looking for a way to launch my application(few Activities, Services, Receivers) from the Setting menu.
In other words I am interested to know:
1. I this a trivial task ?
2. Did someone has done such task before ?
3. What APIs and application's code should I learn
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Aug 6, 2010
1 . can we get any event when user tap/touch native application(i.e. messaging,contacts).
2 . i know that any application launch by intent in android, there is any way to know which application launch with launch of application.
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May 4, 2010
I am launching Google map application from my application, using
Uri.parse("geo:" + "13.042206" + "," + "80.17000?z=10");
and its working fine. But I want to show direction between two latitudes and longitudes, for that I tried using this uri,
Uri.parse("geo:" + "13.042206" + "," + "80.17000" + "geo:" + "9.580000" + "," + "78.100000?z=10");
But I am getting a Toast telling "Unable to load the url".
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Jun 4, 2009
Is it possible to launch other apps from my app like the application launcher or home screen do? I don't want to try a home replacement app. At least would a widget on home screen be able to launch other applications? Also can a widget on the (default) home screen receive swipe events (before a touch event)?
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Nov 16, 2010
I'm testing a simple hello app and it's not launching on the emulator. There's no errors and the console is this:
[2010-11-16 21:26:06 - Hello World] ------------------------------
[2010-11-16 21:26:06 - Hello World] Android Launch!
[2010-11-16 21:26:06 - Hello World] adb is running normally.
[2010-11-16 21:26:06 - Hello World] Performing com.hello.HelloWorld.HelloWorld activity launch
[2010-11-16 21:26:09 - Hello World] Launching a new emulator with Virtual Device 'VirtualDevice2.2'
The emulator launches and the screen appears with the lock and my app doesn't start. Tried to unlock and go to launcher to look for my app and it's not there. Anyone can help me on this one?.......
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Nov 8, 2010
I want to launch Twitter in my application. I want to know that, Is it possible to launch twitter in my app using any API? If it's possible, please post the code snippet. I should be able to see the real twitter homepage (not directly invoking the "url").
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May 6, 2009
Example: I have a button which starts an activity with GET_CONTENT audio/* I have a menu with choices: Music Track or Sound Recorder and a checkbox. I check the box, it tells me that I can clear the setting in Application -> Manage Applications. I launch the Music Track with the box checked. I go to the application settings, but the "clear defaults" button is always enabled. It was already the case with 1.1 SDK, 1.5 does not help (tested on emulator 1.5 AND ADP1 with 1.5 recovery image). I also tested the allowClearUserData flag but it seems we cannot clear anything but the cache (for the webview ?)
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Dec 17, 2009
I got a null pointer exception in an Activity onCreate() while trying to access my Application object (extended from android.app.Application).This exception occurred very rarely and i have no way to reproduce this again.My App starts a service on BOOT_COMPLETED intent and the null pointer exception seems to have occurred during boot up. Can somebody please throw some light on this issue? Application should have been created before creating any activities.
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Aug 18, 2010
I have an android application which allows the user to open up google maps or navigator to show a certain address. This functionality was working in the past, but now I get the following error and the app crashes:
ERROR/AndroidRuntime(2165):
android.content.ActivityNotFoundException:
No Activity found to handle Intent { act=android.intent.action.VIEW
dat=google.navigation:q=MCNAMARA+TERMINAL+ROMULUS+MI+48174 }
The two intents I'm using are-
1) For Map:
String uri = "geo:0,0?q=MCNAMARA+TERMINAL+ROMULUS+MI+48174";
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
startActivity(i);
2) For Navigator:
String uri = "google.navigation:q=MCNAMARA+TERMINAL+ROMULUS+MI+48174";
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
startActivity(i);
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Sep 13, 2010
I have one application in android when I run that application it shows that exception
09-13 16:38:25.049: WARN/dalvikvm(269): VFY: arbitrarily rejecting large method (regs=132 count=21332)
09-13 16:38:25.049: WARN/dalvikvm(269): VFY: rejected Lcom/ExtraCharge/Calc;.onClick (Landroid/view/View;)V
09-13 16:38:25.059: WARN/dalvikvm(269): Verifier rejected class Lcom/ExtraCharge/Calc;
09-13 16:38:25.059: WARN/dalvikvm(269): Class init failed in newInstance call (Lcom/ExtraCharge/Calc;)
09-13 16:38:34.883: WARN/ActivityManager(64): Launch timeout has expired, giving up wake lock!
09-13 16:38:34.999: WARN/ActivityManager(64): Activity idle timeout for HistoryRecord{43f8da58 com.ExtraCharge/.Calc}
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Apr 21, 2009
I have made a game with just one activity.. I just replace the views when I want to change screen. The game runs fine for a really long time inspite of what ever I do within the game.
But once I close the main game, by calling finish on the only activity in the application, and then when I start again, within the next 30 secs it crashes telling VM budget exceeded..
When I don't have a dispose() or a delete method in JAVA.. how the, am I supposed to remove the objects used in memory.. moreover I have android:launchMode="singleInstance" in my manifest
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Aug 16, 2010
Although I have seen several threads and tutorials on this topic, I guess I still have some confusion on how an application can be chosen from a list of applications to display a file.
I have a Activity which has a list view in it. This list view is bound with file paths (so a file browser of sorts). When we click on a specific file type, I need a list of applications that can open that file.
So far this is what I have in the OnItemClick for the list item:
CODE:............
When I run this on my phone, the error is:
No Activity found to handle Intent { act=android.intent.action.VIEW cat=[android.intent.category.DEFAULT] dat=file:///
When I do the same in a file browser application (downloaded from the marketplace), I get two options (QuickOffice and Word to Go), both of which I have installed on my phone.
Could someone guide me as to what else is needed here? Things I have tried besides the above:
Add the following entries to the manifest:
CODE:................
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Dec 24, 2009
You can see property action android:name= property is "android.intent.action.MAIN" and categoryandroid:name= is "android.intent.category.LAUNCHER" for all activities.When application starts up, it calls First Activity. Then calls useless Activity such as ThirdActivity or Second Activity.In this case, is my manifest.xml correct?Or, do I need to set another property to Second and Third activity? If so, what is that?I wonder manifest.xml file is right for my case.
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Mar 20, 2009
Is it possible to launch adb commands programatically from any android application?
For e.g. installing .apk file to /data/app/ directory from another android application using some APIs?
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Dec 2, 2009
I am using Android 1.6. I saw screen lock settings in Security & location .I set the screen unlock pattern. But android is not getting locked. How can I lock my android screen ?
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Apr 5, 2010
I want to make an android application that shows a listing of applications (downloaded from the android market) and launches the one that the user selects. From what I've read, I'd have to use intents like this:
Intent intent = new Intent();
intent.setClassName(packageName, className);
startActivity(intent);
I just want to be able to launch the applications, not a specific activity that they could have.
My question is: How could I launch these applications if I don't know their packageName or className? or maybe, how could I get to know their className and packageName, if it's a closed source application that I didn't develop.
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Jul 5, 2010
My problem is thus; I am new to programming on the ANDROID platform and have a 'working' application that piggy-backs on the API-Docs example. I wish it to launch three tabs one containing a list of reports, one a form to file a report and the last to show the geo-located reports. It doesn't appear as a separate application, it instead appears as a list to be launched by the API-Docs example.
Below is my manifest code...
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