Android : MediaPlayer Instance Seems To Crash My Emulator During Configuration
Apr 25, 2010
I'm and android beginner, so go easy on me. I'm trying to play a sequence of video files which I'm downloading from a server. The challenge is that I want to have a smooth transition from one file to another.
My thought is to have two MediaPlayer instances each preparing and then playing in turn. It is not clear to me if they can both share the same SurfaceView?
Or maybe, I should be using different views and swapping between them? Or, the idea is a bad idea all together?
When I try to run configure the MediaPlayer instance with a view that isn't visible it seems to crash my emulator.
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Sep 3, 2010
Say that there is an App Widget that shows a configuration Activity when placed. The configuration page allows adjusting the appearance of the widget.
The user may place multiple instances of this widget on their home screen. What would be the best way to maintain the unique configuration states on each of the widget instances? Or would each widget instance have to adopt the same global state?
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Jun 28, 2010
I have a audio player app, where there is a Main activity that shows 3 audio sample urls. On click on one, it goes to a Details Activity, which has a play and pause button, to start and pause the audio.
My problem is that, when I start the Main activity, and say click on audio 1, I hit play on Details activity. This starts the MediaPlayer and the audio starts to play. When I go back to the Main activity, the audio is still playing, which is what I want. Now, when I click on audio 1 again, and go to Details Activity and hit play again, there seems to be a new MediaPlayer starting the audio. So I have 2 tracks playing together!
Is there a way I can have only one MediaPlayer instance at any given time?
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Jul 24, 2010
I have a large bitmap that i would like to keep in memory when the qwerty keyboard is visible. My app is always in landscape, so this is the only configuration change that will cause a reDraw. I heard this is what onRetainNonConfigurationinstance() is for...but cant figure it out. Can someone point me in the right direction?
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Apr 20, 2009
I need to run several emulator instances to test my application. When i try to run instances using emulator -data <path> option, the emulator crashes.
I got a MS Visual Studio window informing that emulator throws a "unhandled win32 exception".
The exception message in the debugger (MS Visual Studio 2008) is: "Unhandled exception at 0x77c4706c in emulator.exe: 0xC0000005: Access violation reading location 0x03216848"
The emulator runs normally without "-data" option.
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Dec 3, 2009
If the MediaPlayer actually works on the Android emulator.
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Feb 22, 2010
I need to run unit tests for code that references SQLiteDatabase for my Android code; however all my attempts to instantiate this object outside the emulator (on my desktop machine) have failed. JDBC on Android is not being recommended on the Net, hence it's out of the question (I could have provided mock objects very easily that way).
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Aug 31, 2010
I have an app that uses quite a few graphics in it. When I open and close my app repeatedly on my emulator (1.5 - 2.2) it runs fine and by checking the heap I can see everything is being cleaned and gc'd properly. However, when I run my app on an HTC Aria phone (2.1) the app crashes every time I try to re-open it. When I look at the heap I can see that objects are NOT being cleaned up like they are in the emulator. Does anyone know why this behavior could be happening? I did try it on another HTC Aria (a friends) and it crashed the same way as on my phone so I think it's not just isolated to my particular phone. Any thoughts or ideas would be really appreciated on why things are cleaning up properly on the emulator, but not on my phone. One thing to note, is that I DID have it working and gc'ing fine on my phone a few days ago and I didn't change much and now it's not working on my phone so it's a bit of a mystery to me.
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Dec 31, 2009
Does someone know how to simulate service crash in emulator ?
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Apr 27, 2009
I have a requirement to play several sounds many times in my game so instead of creating the MediaPlayer again and again I have called mp.seekTo(0) in onCompletion(mp) so that it will restart. Sometimes the sound is not audible from the device when I call mp.start () after setting mp.seekTo(0); but the player calls onCompletion() without playing any sound, this is observed randomly on most of the sounds
My sounds are of short duration mostly less than a second.
I am using a separate MediaPlayer for each sound (as I need this) -
There are almost 28 sounds in my game so i will be creating 28 MediaPlayers.
Below is the attached code for player
Also If I try to play many sounds one after the other in a short period of time i get an error saying "no more track names available". can u tell Why this is happening...?
check the below code:
CODE:........
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Oct 6, 2010
I would like to know if the Android handsets can be configured Over-The-Air; in other words, if they can be configured for settings (such as GPRS , WAP or MMS ...) using OTA. If yes, do they support OMA CP provisioning? Is there an XML example that can be used to configure the Android devices?
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Nov 24, 2010
I have a simple Android application that loads a page in a WebView, then most of the real work is done by the server-side scripts. Everything is working great, except that I currently have the page URL hard-coded in the Android application, sort of like this:
mWebView.loadUrl("https://www.my-application-url.com");
This was fine until this morning when I was asked to to make it so that the user is prompted to enter the URL the first time the application run, and the URL that is entered by the user is then saved and used automatically by the application from that point onward. I was also asked to make it so that the user can change the URL if they choose to do so. The reason I was asked to do this is so that users can install the server side of the application on their own servers and my Android application will be able to connect without me having to write a custom version for each user, with their URL hard-coded into the application.
I am unsure what is the best way to handle this in Android. It seems that I probably need to add some type of configuration interface to the application that is shown by default on the first run, then only when the Menu button is pressed on the following runs. From this configuration interface I guess I would then get the URL from the user and serialize it for future use. What is the best way to accomplish this?
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Apr 2, 2009
My application has 2 activities. The main activity will create the "child" activity through startActivityForResult((...). When the child activity needs to exit, it calls setResult(..) and finish(). Child activity will start and exit multiple time upon user selection. The activity are start and exit as expected and onAcitivtyResult(..) also got invoked.
However, I found a problem with child activity, when the child activity was created the second time ( Main activity called startActivityForResult(...) upon some user event ), a new instance of child activity was created, but the displayed is the FIRST instance child activity! ( so any state in second instance of child activity was not accessible ). The onKey(...) was always go to first instance of child activity. Make things more interesting, the getInstanceCount () returns 3.
I have checked the code and no where holds the first instance of child activity which should be garbage collected after finish().
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Apr 9, 2009
Is there a way to prevent the user of opening more than one instance of my application?
For example: User clicks on App and opens it. The user clicks on the home button. (the app is still running in the background) The user clicks on (not the menu button, but the button above it in the homescreen), and then opens the application again. Does it open the same instance, or does it create another one? If it does create another one, how can I prevent it from creating another one, and just opening the existing instance?
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Jul 9, 2010
Is there a way to get an instance of the activity that has called the currently running activity from the intent object that has been passed to it? eg. if A has called B, I would like to retrieve A's instance from the intent in B's onCreate method. As Activity is not Serializable i am not able to pass the instance in the extras bundle.
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Sep 7, 2010
I have two activities.A and B. A starts B.Both are running in the screen and both are visible. Say now B is visible.
On a special key press, I want to bring the A to the front and make it active. The problem I am facing is when the special key is pressed, another instance of A is launched and the new instance is brought to the front.
But I want the original A to come to the front. I want to make this change in the framework layer rather than application specific by using the singleInstance theme in the launchMode in AndroidManifest file.
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Jul 19, 2010
I've only owned an Android for 6 days (Samsung Galaxy S i9000) and one of the first things I installed was Juice Defender, having used iPod Touch extensively, I know how heavy on battery things like WiFi can be. Anyway, JD makes the phone really really leggy. It can take a minute sometimes (literally, 45-65 seconds) for the JD screen to come up when launched. Similarly when waking from sleep it takes ages for the data connections to become active again. Have I misconfigured JD? Is it really this slow and creates this much lag? Does it just not like the (fairly new) i9000? I've just uninstalled it there right now (left Ultimate Juice on) and the phone is much snappier. It's like using it for the first time. Which, considering JD was installed in the first half hour of my owning the phone, it kind of is. What I really wanted was the WiFi on/off according to cell tower location data so I can have it go on and off when I leave the house. Guess it's no real biggie. Having limited background data (e.g. the 2 mins per 15) is handy too. Are there any other apps which have JD functions - even if more limited in scope - that I can try?
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Oct 4, 2010
Having some trouble getting handcent configured right. I want it to only show the notification in the top status bar and the dock. I do not want the popup window. Can someone tell me which settings to use? I have tried everything and cannot get it right.
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Aug 26, 2009
In Java ME we can set .jad configuration in description file and we can get this values in midlet by getAppProperti(""); So in Android we can set apk configuration (eclipse) apk configuration. But when I set this! my file default properties change and my projet signal some error. So in activity when can add System.setProeprty("name","values"). My problem I wan to specify the server IP and some code in apk only for this apk file. Each apk can have his code and server IP.
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Jul 10, 2010
I need to display a configuration screen when a user installs my application. Is this possible to implement? That screen should not appear again.
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Jun 24, 2010
Is there a way to know if there is an instance of your widget currently on the homescreen? I always end up using variables that change state with onUpdate() and onDeleted() calls, but that obviously that isn't effective in every scenario.
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Nov 22, 2010
I have referred the example given on: http://goo.gl/1uxXv , But it is not showing the exact DatePicker dialog as given in the book example, what i should do to display the same dialog box or Calendar instance in my application ?
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Nov 6, 2009
Im creating a mail application, where i need to start a service instance for every account, which will check for the new mails for that account. Now my problem is that i want to identify how my service i have created so far (by calling startService()). And also i want to stop a specific instance of service. I know that calling stopService() will stop all the instances of that service. Is there any work around to it.
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Nov 17, 2009
I am trying to do the following.
I have an Image viewer where in the user picks an Image from within the gallery. The uri to that selected Image is available to me. Now, I want to use this URI information and send it as a file over a socket using FileInputStream. Is this a valid syntax to perform the above action?
CODE:..............
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May 9, 2010
I have a bunch of tab activities (which I implemented myself, didn't want to use the tabviews with activities inside them), so It's basically 5 activities calling each other every time the user clicks on the tabs displayed as a row of LinearLayouts at the bottom of the screen.
The thing is that the way I do it now, everytime the user jumps from one activity to another, a new activity is created and launched. Of course, I can see I'm wasting resources this way. So what I would like to do is to create every activity only once; and then if the user wants to go back to the previous (or any one that was already created and is probably paused) just check on some kind of list or array to see if the activity can be recovered and only in the case it can't; to lauch a new one.
My question is, how can I check this? should I save the intents? and how to recover the activities afterwards? I'm kind of new with java.
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Jun 26, 2010
I'm trying to obtain an instance of ServiceState in my Activity. But how am i supposed to do this? There is no static method to obtain an instance or any method on any service that returns an ServiceState instance.
There is the TelephonyManager.listen() call. But i want to get the ServiceState instance when i want, not when android calls my listener because something changed.
The documentation of ServiceState can be found here: http://developer.android.com/reference/android/telephony/ServiceState.html
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Jul 19, 2010
Is there any way to get the instance of a launched activity(or any view in that activity )of a application in another application.
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Aug 16, 2010
We all know that hitting the back button on the device doesn't kill the application, it merely finishes (destroys) the activity running on the foreground.
Well I have come across some code which helps me capture the back button signal so that I cannot exit the application. The only way to exit it in such cases is to press the home key.
Now this situation presents me with a unique disadvantage! The inability to kill finish the application on a time of my own choosing allows the application to keep running in the background like nothing has changed.
So in such cases is the task manager my only friend or is there a way for me to otherwise kill this application?
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Aug 24, 2010
I need to save some state when the user leaves my game during game play. Saving the state doesn't seem to be an issue, but I can't figure out how to restore it. The onCreate function isn't called when the Activity is resumed (only when it is first created), so I can't get my state back there. Logically, I would use onRestoreInstanceState, but it isn't being called.
CODE:..........
I see log output from onSaveInstanceState, onResume, onCreate, etc, but I never see a log message from onRestoreInstanceState and savedState is always null. Why isn't onRestoreInstanceState being called, and is there another way to get my state back?
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Sep 11, 2010
How can I make sure that only one instance of Service is created?
I have checked some functions with logging (WeatherService is the class who extends Service):
CODE:........
It gives different hash codes even when I am sure that the same function is running twice (downloading):
CODE:............
I am binding a Activity to the service with:
CODE:.......................
And the service can run for minutes until it is completed, therefore the service can be binded to/created by many Activities.
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