Android :: Optimize Android App Code Based On Function Call Stack
May 28, 2010
I've been told that Android OS stores all function calls in a stack. This can lead to many problems and cause the 'hiccups' during runtime, even if a program is functionalized properly, correct?
So the question is, how can we prevent this from happening? The obvious solution is to functionalize less, along with other sensible acts such as refraining from excessively/needlessly creating objects, performing static calls to functions that don't access fields, etc...
Is there another way though? Or can this only be done through careful code writing on the programmers' part? Does the JVM/JIT automatically optimize the bytecode during compile time to account for this?
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Apr 19, 2009
The following is the log from native code.
CODE:.................
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Sep 24, 2010
There is a HTML page that has a javascript function in it.This function returns a frame with a random picture. Is there a way to call this function and get the HTML code that is hidding? (So i get the image)
Exactly i want to get a html stream from GoogleServices.js
by calling:
GS_googleAddAdSenseService("ca-pub-YOU
RPUBIDHERE");
GS_googleEnableAllServices();
GA_googleAddSlot("ca-pub-YOURPUBIDHERE", "ADSLOT_NAME_HERE");
GA_googleFetchAds();
GA_googleFillSlot("ADSLOT_NAME_HERE");
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Dec 21, 2009
can any one tell me what is d actual diff in Stack based and Register based JVM?
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Aug 23, 2010
I want to do optimization of my android application.
Can anyone please tell what are different ways to optimize code and performance in android?
I gone through one tool i.e. Zipalign: an Easy Optimization.
Any other tools available?
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Jan 27, 2010
I can build a daemon with my algorithm code and main function.I put all files in one folder under /development and make This executable file works successfully
Now I want to separate my algorithm code and main function code. I hope to build a binary library with my algorithm code and main function will link this binary library to use.
Where to put my algorithm code to create binary library and how to link this binary library in main function code?
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Feb 12, 2009
Here my application "com.android.hello" calls a core library "libvt.so" through JNI call. There is a segmentation fault in "libvt.so". When executed I get the following log What I see is some Hex value followed by a library name. #00 pc afe0d24c /system/lib/libc.so
Also there is a Stack section 01-01 00:02:57.800: INFO/DEBUG(1600): stack: 01-01 00:02:57.800: INFO/DEBUG(1600):bef2e570 bef2e604 [stack] 01-01 00:02:57.810: INFO/DEBUG(1600):bef2e574 afe0a333 /system/ lib/libc.so
This too gives similar information. I am looking for little more informations rather than Hex values. Like the backtrace feature where the stack hex values is mapped to the function names and function names are visible.
Please provide information how to see the function names in stack rather than Hex values. Is ther any compiler options needs to be updated? Any makefile to be updated to enable backtrace?
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Aug 30, 2009
I've implemented an onSaveInstanceState function in the main activity of my TabHost-based application. I need to save the state of various objects I am keeping in memory that I have all marked as serializable, as well as some basic int and string values. I have stepped through my application and watched it call the onSaveInstanceState function and presumably save everything without any manner of exception or problem. The issue is that my onCreate function is being called with a null Bundle value every time after I start the application again. I'm really at a loss and unsure why it would call the save but not pass anything into the create.
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Sep 30, 2009
Had a few days of use without issues, go to make a call yesterday and it takes ages to connect, but instead of connecting I get a beep and then it returns me to my contact list. Tried putting the phone in and out of flight mode by holding down the power button and selecting the flight mode option, the option turns grey after I press it, won't allow me to press it again and seemingly does nothing. Press the off option and turn the phone back on and it's fine. Now I reckon I had suffered this with earlier firmwares.
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Jul 7, 2010
Anyone could compile some SIP Stack in C/C++ along with Android source code? Note: i am referring not to compile the Sip Stack with ndk, but compile with all the code of the Android platform.
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Jun 8, 2010
How do I fix a bug that doesn't point to any of my code? I got the stack trace below from the Marketplace crash reports, but I have no clue how to fix it since it points to none of my own code.
java.lang.NullPointerException:at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:487)at android.view.View.measure(View.java:7964)at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3023) at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)at android.view.View.measure(View.java:7964)at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3023)at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)at android.view.View.measure(View.java:7964)at android.view.ViewRoot.performTraversals(ViewRoot.java:763)at android.view.ViewRoot.handleMessage(ViewRoot.java:1633)at android.os.Handler.dispatchMessage(Handler.java:99)at android.os.Looper.loop(Looper.java:123) at android.app.ActivityThread.main(ActivityThread.java:4363)at java.lang.reflect.Method.invokeNative(Method.java:-2)at java.lang.reflect.Method.invoke(Method.java:521)at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)at dalvik.system.NativeStart.main(NativeStart.java:-2)
I'm not seeing any issues on any emulators or devices.
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Sep 25, 2009
is there a way in android to get the call stack when an unhandled exception occurs? or better yet, to trap an unhandled exception and do something when it occurs.
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Sep 12, 2010
I am writing an android game that involves some c++. I have a fairly repeatable crash that seems to be due to my c++ code
Looking at the page:
http://source.android.com/porting/debugging_native.html#Debug_Scenarios (right at the end)
it says to run the output through the "stack tool" - which I can find no trace of.. nor aproto.
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Sep 3, 2010
I have placed an icon on the status bar. I would like to run a method of another class whenever the user selects that icon. I've seen similar functionality used in volume icons that sit on the status bar that allow a user to raise or lower the volume when the icon is clicked. However, these icons are on the right side of the status bar, and from what I've seen, I'm not allowed to put an icon there. I don't know if that kind of functionality is available to left side icons. So basically, I'm looking for how to run a function when a status bar icon is clicked. I don't want to open an activity, I just want to run a function.
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Jun 10, 2010
say for example I have this code in my activity:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Thread cThread = new Thread(new Runner());
cThread.start();
}
private NotifyMe(){
//do something here
}
and this is my Runner class:
public class TCPClient implements Runnable {
public void run(){
//call NotifyMe() [THIS IS MY QUESTION]
}
}
I have a thread on my activity that runs the Runner Class. Once the thread start, I would like to call the NotifyMe() function that is located at the activity. Is this possible?
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Oct 8, 2010
I create a javascript function to generate the graph using RGraph.Now i want to send the data for the graph parameters from android java file.For that i want to access the script function in the android java file.Could anyone tell how to do that in android.
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May 16, 2010
I have an Activity (A) and a Service (S) which gets started by A like this:
Intent i = new Intent();
i.putExtra("updateInterval", 10);
i.setClassName("com.blah", "com.blah.S");
startService(i);
A have a function like this one in A: public void someInfoArrived(Info i) Now I want to call A.someInfoArrived(i) from within S. Intent.putExtra has no version where I could pass an Object reference etc.
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May 9, 2009
I have a media player that plays a sound. I want to call a function as soon as the sound is complete but i cant figure out how to do it.
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Sep 21, 2010
I would like to compile a list of Android phones that either
1) Comes with native call recording functionality.
2) Support call recording with 3rd party applications.
It would be great if you can lend a hand.Please note that phone/apps that require using speakerphone to record the calls do *not* count. That's a ugly hack I consider marginally useful.Please don't bring legality discussions here as well.Models that have this function built-in.Samsung Galaxy S (South Korean version SHW-M110S, with firmware DH09 or newer).Models that don't have this function built-in but can use 3rd party app to record calls in both ways without turning on speakerphone.HTC Magic (a.k.a. G2); requires root and custom kernel; with rViox
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Jul 14, 2010
Does anybody know how can I get the build-in function call trace on Android phone?
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Feb 1, 2010
I used PhoneAlarm to do my call forwarding when I was on the "other" platform. It dialed my call forwarding number based on time of day. I know Locale has the capability but there is no plugin to do it. Does ANYONE have an App or know how I can call forward based on location or time of day or to at least call any number based on this criteria? I do not, or I should say, cannot use Google Voice since I have no account and they are not taking any more users.
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Jan 31, 2010
can u tell me how to call a java script method from android activity...
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Nov 16, 2010
I am trying to pass 2 parameters to a javascript function.This code webview.loadUrl("javascript: function_to_call();"); works fine without parameters but i couldn't use it with parameters. code...
And this is how i call it from java . code...
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Feb 19, 2010
Is it possible to show any animation when i call a function in same class in android?
In my application, i called a function "doAddition" so many times.And i want whenever i call this function, it shows some animation.
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Oct 21, 2009
I'm a proud owner of a HTC-Hero and I really loves it. Best phone ever.I have managed to find pretty all applications I need but there is one I really missing.When arrive home I am always redirect all incomg calls to my landline and do so by All call forwarding.It happens quite often that I forgets to inactivate this feature when leaving for work and all calls will then be redirected to my home and ofcourse none will answer.I'm looking for an application that identifies my WLAN and then automaticly redirects all calls to my landline and then when signal is lost, remove the redirect. It would also work for me if the application use the radio tower as a reference or via GPS-tracker.
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Jun 24, 2010
Suppose i have one simple function in my program. Whenever i call that function does a new thread or process is spawned to execute the function or it is executed under the main thread memory space only.
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Sep 28, 2009
My activity bind a service. I want to call the service's function in activity's onStart/onCreate function, but it doesn't work. The service started sunless but the connection is null. When I just call the service's function in other function (onClick for example),
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Sep 24, 2010
It's possible to specify a particular function to be called when button is clicked by setting its onClick attribute in xml:
android:onClick="function_name"
I want to do something similar for FocusChange of buttons, is this possible?
Specifically, I wish to increase my button's size when it has focus and make it normal sized when not focussed. To apply this to all my buttons, I hoped to call a specific function which does this and then specify this function name in my style.xml. But there is no onFocusChange attribute in android.
It works when I add overriden onSetFocusChangeListener for each of my buttons separately in the code. But is there any other solution?
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Nov 10, 2010
I have various activitys on my app. I have a configuration Activity, and i want to put a cancel button, that, when user press this button, the configuration window get's closed and turn back into the previous activity.i search in google and i find something about calling cancel or dismiss functions, but i can't call them cause this is not a dialog, it's an activity
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Jul 6, 2010
My point is to be able to call a 2.1 API if it exists, while the application should be able to run in 1.5
Specifically, I am making a GPS application which would like to call android.location.LocationManager.addNmeaListener if available. My problem is that this call takes as parameter an abstract class (GpsStatus.NmeaListener) which I cannot pass directly to Class.GetMethod (or my application won't work in 1.5). What I am currently trying is a) to create a wrapper class for GpsStatus.NmeaListener:......................
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