Android : Dump All Thread Stacks / Can Do This From Within Java Code?
Aug 4, 2010
We have a service that seem to get deadlocked very occasionally in the field. It's not possible to hook up to a debugger. We can detect the deadlock situation programmatically. Is it possible to do this from within Java code?
if (ohIamDeadlocked()) { Thread.something.dumpStacksOfAllThreads(); }
If this is not possible, is there an adb command that could do it? I tried "adb dumpsys" but it doesn't print any stack information.
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Sep 7, 2010
How can I implement a run() method of thread if I create a Thread Global?
I mean If I create a Thread Globally then can I implement its run() method {" public void run()"} anywhere in my Application?
In the run() method I have to write the code to perform some action.
IF I can do it then please can anyone show me briefly how to do it particularly.
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Jun 16, 2010
In my application , i have an option to capture the hprof dump. I used
android.os.Debug.dumpHprofData (String fileName)
Initially i though the hprof data generated by the method above is for the entire device , which is not so . The hprof data generated is only for my process.
Now i am trying to generate hprof data for other process as well. I need to get the Hprof dump for all the running processes from application code.
from adb shell i tried "kill -10 <pid>" , This command will generate the hprof file for the corresponding process in the data/misc folder.
Now the problem is this command is working perfectly from the adb shell prompt , but i am not able to embed the command to mycode.
My code is like
Runtime.getRuntime().exec("chmod 777 /data/misc") Runtime.getRunTime().exec("kill -10 <pid>")
No exceptions are thrown , but somehow it is not working. The same code above is capturing Hprof dump for my process, when i give my process ID.
I tried with "android.os.Process.sendSignal (int pid, android.os.Process.SIGNAL_USR1) ;" also.Getting the same problem.It is capturing Hprof dump for my process. For other processes it is not working.
Do we need to have any special permission to kill other process from our process ? Or is it a built issue ? can you please suggest some possible way to get Hprof dump for other processes from application code?.
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Nov 12, 2010
I need a library in java that can take HTML content and generate text in the same format that is generated by the Linux lynx program.
That's it. Reasons below if you care.
I need to expose data provided by 3rd party servers to end users on Android. Data format is ancient, in badly formatted HTML, so much that I've tried reading it using java and it fails occasionally (unacceptable). It is also growing every month (preinstall ruled out) and I can't convince them to change to "modern" stuff (life would be great in XML etc.).
Shortest route: I wrote a class to use the W3 html2txt service online (google search it). It worked fine on the app until I got complains and noticed that the W3 service fails occasionally. It's not that big of a deal, but the black box logic expects the output to be in this "lynx like" text format.
So I would like a library to do the conversion (HTML->TXT) in "lynx style" inside the app and avoid the outages in the W3 service. And besides, the lynx output the probably the best I've seen, the most organized and neat.
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May 8, 2010
Does anyone know how Java thread relates to Android native thread? Does it map one to one?
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Jun 16, 2010
I'm writing an Android app. I have a main method, which creates and runs a new Thread using an anonymous inner Runnable class. The run() method, when it's done, calls a method on it's parent class (in the main thread) that calls notifyDataSetChanged() so that the main thread can redraw the new data. This is causing all kinds of trouble (ViewRoot$CalledFromWrongThreadException). The thing is, this method being called from the worker thread is on the class that's created in the UI thread. Shouldn't that be running on the UI thread? Or am I missing something.
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May 10, 2010
I have a multithreaded streaming app which has mainly the following 5 threads. 1 Main App(UI) Thread 1 controller thread (in native) 1 audio decoder thread (in native) 1 video decoder thread(in native) 1 thread to query the head position of audio (in Java) Apart from this I have video rendering with OpenGL. My problem is, if I query the thread priority using the Thread.getPriority method (my native threads make callbacks to Java and I am making the query at that point of time), I am getting the priority of each of them as 5. For my audio query thread (the last one in the list) I am explicitly setting the priority using Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_AUDIO); Also for my decoder threads, I am giving higher priority than my controller thread(using pthread APIs in native). But still finally all of them seem to have same priority. Also what should I be doing to increase the priority of my threads(both from Java and native)?
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Feb 7, 2010
I know how to use handlers to update UI elements such as progress bars toasts etc. The problem I am having is when the context goes away such as the user pressing the back button or the Activity finishing for some reason. This causes my application to crash often. I tried using
getApplicationContext()
(Thinking that this would be available throughout my entire application) but this did not work, ever - instead my application crashed! I put try catch blocks around all UI update code, this works but is it necessary? What is the bast way to handle this?
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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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Jul 23, 2010
I have an AIDL service that is intended to be used by both out-of- process remote users and in-process local users. As a result, my common interface methods will either be invoked on the UI thread or in a binder background thread. The logic between the two is not the same. How do I distinguish between these two cases?
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Sep 9, 2010
Is there a reason why the Thread class in the SDK LunarLander and JetBoy examples are not each in a separate java file, rather than being inside the View file?
It would make things a bit clearer, IMHO. Am I missing something?
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Jun 18, 2010
Can the Skype for Android application be operated over any of the available VPN stacks?
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Nov 10, 2010
I have an app that contains multiple tasks (stacks of activities). I can jump from one to another with no problem, but when i finish a task it goes to the previous stack. I would like to finish all stacks whenever i finish one of them, because I want my application to finish. Does anyone have an idea on how to achieve this?
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Aug 17, 2010
I have an activity with 50 buttons. Want to avoid writing 50 switch cases for onClick listener events. Is their a way to map the buttons with its respective loading of UI in XML format and avoid writing Java code.
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Aug 12, 2009
I need to create dynamic UI. How can I add margin to the left side of the button.
newPost =new Button(BlogsList.this); newPost.setText("Add Entry To Blog"); newPost.setPadding(10, 10, 10, 10); newPost.setLayoutParams(new LayoutParams (LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT)); newPost.setOnClickListener(new NewPost(b.getName (),b.getBlogId())); l22.addView(newPost);
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Sep 28, 2010
I need to de-serialise a file into an object of a given type. Basically the method will do this:
FileInputStream fis = new FileInputStream(filename);
ObjectInputStream in = new ObjectInputStream(fis);
MyClass newObject = (MyClass)in.readObject();
in.close();
return newObject;
I would like this method to be generic, therefore I can tell it what type I want to in.readObject() to cast its output into, and return it. Hope this makes sense...then again, I probably didn't understand generics properly and this is not actually possible, or advisable.
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Oct 1, 2010
<string name="title_new">Yeni Kamera</string>
I have this string in string.xml,
public void SetTitle(String _title) {
title.setText(_title);
}
And title is a TextView.. I want to take string for _title, how can I do?
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Oct 10, 2010
I Have a Java application and I need to convert it to an Android application is there any resources to show how ? in Android developer site I didnt found anything like that! I need to use the Java methods and classes in android ,How it can be done?
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Jan 10, 2010
I just wanted to know if any one knows how i could power off android via java code ?.
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Aug 25, 2009
Why I have this error? It' s the same java code than the following url:...........
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Apr 2, 2009
How to set position of TextView and EditText using java code. i want to set EditText just after TextView.
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Aug 15, 2009
How can I install .apk file by using java code. that is , we can install .apk from cmd "adb install program_name.apk" I wonder that how can we install .apk file bu using another program. To summarize I will have button and when user click it another program(in sdcard) will be installed to phone.
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Mar 9, 2009
In my layout xml, I have: <TabHost android:id="@+id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent">
<TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content"/>
</TabHost>
My question is how can I get a reference to TabWidget object. I tried this: mTabWidget = (TabWidget) findViewById(com.android.internal.R.id.tabs); but this won't compile since 'com.android.internal.R is not visible. And then I try change the id to android:id="@+id/tabs" but I get a run time error saying: "Your TabHost must have a TabWidget whose id attribute is 'android.R.id.tabs'"
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Jul 30, 2010
I want to add <uses-permission> via programatically .I want to telephone number of the device.For that i need to access the phone state.But i need to add that permission only with Java code at runtime. Is it Possible to do so. (or) Can you suggest any alternative way to read the telephone number .?
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Sep 19, 2009
Resources.getDimensionPixelSize (android.R.attr.listPreferredItemHeight) does not work. So how to? And any other way to specify resolution independent dimension values in Java code?
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Nov 24, 2010
I found that it is possible to set dimensions of my interface elements in XML layouts using DIPs as in following fragment : "android:layout_width="10dip" But all Java interface takes integer as arguments and there is no way to specify dimensions in DIPs. What is the correct way to calculate this? I figured that I have to use property density of DisplayMetrics class but is this a correct way ? May I rely on that formula:
pixels * DisplayMetrics.density = dip
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Nov 19, 2010
I want to hide the linear layout so i used
LinearLayout mainLayout=(LinearLayout)this.findViewById(R.id.mainLayout);
mainLayout.setVisibility(2);
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Sep 25, 2009
android:enabled can be set at AndroidManifest.xml <activity android:name="MyActivity" android:enabled="true">
How can I set the attr true or false in my programm?
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Jun 15, 2010
I am trying to integrate Google Health on android and am trying to use a client login example which is working fine as a standalone java program. But when I implement the same in android it gives me all these errors. I guess I am missing some saxparser libraries. Here is the code that I am using. I am using the same code that was used in the example code provided by google for client login. Can someone let me know where I am going wrong or what I am missing..................
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Nov 23, 2010
I just inherited a project at my workplace and I am having trouble having Eclipse act as an Adroid editor rather than a Java editor. Pretty much everything is under lined and I can't seem to find a way to change how it is interpreted. I have downloaded all of the Android SDK's and the Eclipse Plugin. I can create Android projects and write the code just fine, but everything is still underlining. I must be missing something simple. Any suggestions, something I missed or didn't download?
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