A while ago I tried to work out how to checksum a function at runtime. As I remember, I failed due to some missing functionality of the class loader from vanilla java. Has anyone managed to do this ?
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I am calling a method of another .apk file dynamically at runtime in my application. I can execute it successfully if method does not contain any variable which is defined outside of that method.
But if I am using the variables which are defined outside that method ( in the same activity or same .apk) then my application throws "java.lang.reflect.InvocationTargetException" at runtime.
For e.g. if method defines as ,
COE:...................
As an additional anti-pirating strategy, I'd like to compute a checksum on my application at runtime. Since my app communicates with a back-end server, I can send the checksum with each message and the server can deny service to altered apps. Not a complete solution to piracy by any means, but a fairly easy way to raise the bar. Anyone know how an app can get access to it's load image at runtime?
View 15 Replies View RelatedI do an import of the full package name / java file, and if I do a <classname>.<method>, SOMETIMES I can get it to access - other times I get a lot of can't use a static in a non static bunch of talk. I'll admit I'm new to Java, so what do I need to do? Call a class instance first, then call my methods? I'm rather confused by this, as I want to put all of my 'functions' into a FunctionsList.java file, and all of my main Activity (UI) into a MyActivity.java file.
For example:
<MyActivity.java>
import com.example.FunctionsList;
private class MyActivity extends Activity {
FunctionsList.function();
}
9/10 times I get that static/non-static error. If I put all of my functions into MyActivity.java, I have zero problems!
As far as I'm concerned, Android uses another Java Runtime Environment called Davilk, which is NOT compatible with common Java applications.
View 2 Replies View Relatedi get following error, if i test my app on a real android phone. On the emulator, my app works fine.
W/dalvikvm( 321): threadid=3: thread exiting with uncaught exception (group=0x4000fe70) E/AndroidRuntime( 321): Uncaught handler: thread main exiting due to uncaught exception E/AndroidRuntime( 321): java.lang.VerifyError: de.stefandahmen.android.TourList E/AndroidRuntime( 321): at java.lang.Class.newInstanceImpl (Native Method) E/AndroidRuntime( 321): at java.lang.Class.newInstance (Class.java:1472) E/AndroidRuntime( 321): at android.app.Instrumentation.newActivity(Instrumentation.java:1097) E/AndroidRuntime( 321):.....
Basically i want to start Notepad application in android from my application , can i do this in android using runtime.exec() method of RuntimeClasss and assign it to a process and kill the process later.
View 8 Replies View RelatedI am working through a facebook-sdk example and trying to utilize the collection of classes as provided as a .JAR. I am relatively new to java and eclipse so I expect I am making some obvious blunder.
The issue is that everything seems to compile fine, but when I run the project (using the android emulator) dalvik vm is unable to find the first class I reference from this facebook sdk. ( com/facebook/android/Facebook.class )
As an aside, if I copy the source directly into my project as an additional package everything works fine.
Step 1: I exported the com_facebook_android project as a .JAR file. ( right click project, export, java / jar file ) I choose c:datajagjar as my location to save facebooksdk.jar.
Step 2: I hit properties on the project HelloGoogleMaps, Selected Java Build Path, Libraries, Add External JARS... I the directly selected the c:datajagjarfacebooksdk.jar file.
At this point my project seems to be building just fine ( no errors ).
Step 3: Debug the project and receive the error:
CODE:.................
I'm using the Android Development Toolkit (ADT) in Eclipse Galileo. I've created a project in which to develop some util classes, which I intend to use in several upcoming Android projects. However, when I come to use these util classes (deployed as a jar and included in the Android project as a user library), I get a java.lang.VerifyError during the startup of the emulator. Can I force the verification of these library files, or do I need to include them as part of the Android project, and not as an external jar?
View 3 Replies View RelatedWhere can i get the Java and flash plugins for the present android 1.6.
View 1 Replies View RelatedIn an Android app, I am looking for the functionality of the .NET string function [Trim('aaa')] which will trim off the text "aaa" off a string. I don't think this is natively available in Java and I haven't seen that functionality in Android Java textutil library. Is there an easy way to have a Java app trim a set of characters from the string?
View 2 Replies View RelatedI 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.
View 1 Replies View Relatedin c, c++ , there are many memory-contorl-function like - memset,memcpy,sprintf i want to use those function in java what and how should i use?
View 5 Replies View RelatedI'm very new to java and am working on my first Android app. I am using the webview demo as a template. I am trying to generate a random integer between 1 and 12 and then call a certain javascript function based on the result. Here's what I have:
int number = 1 + (int)(Math.random() * ((12 - 1) + 1));
number = (int) Math.floor(number);
String nextQuote = "javascript:wave" + number + "()";
mWebView.loadUrl(nextQuote);
So mWebView.loadUrl(nextQuote) will be the same as something like mWebView.loadUrl("javascript:wave1()") I just want to know if what I have here is correct and will work the way I think it will. The application isn't responding as expected and I suspect this bit of code is the culprit.
can u tell me how to call a java script method from android activity...
View 3 Replies View RelatedI want to set the color of the TextView by the function getcolorss. I tried a lot of different ways but i cant get in it.
import java.awt.*;
import android.graphics.Color;
public class test extends Activity {
TextView text1 = (TextView) findViewById(R.id.text1);
text1.setTextColor(getcolorss(1));
public Color getcolorss(int x)
{
switch(x)
{
case 1: return Color.BLUE;
case 2: return Color.RED;
}
}}
I am currently trying to integrate a live search functionality in android. I use a customized Autocomplete widget. The widget itself provides me with a threshold to only start a query after a certain amount of characters have been typed in. But what I also want is that a query only starts, say if a user has stopped typing for 2 seconds.
As I load my contents with a AsyncTask I tried blocking the doInBackground function by calling Thread.sleep() right at the beginning. If the user would then continue typing the program would look after an existing task, cancel it and start a new one. This was my idea. But it doesn't quite work the way I expected. Sometimes it sends out queries even if the user is still typing, sometimes queries are canceled after the users stopped typing. Do you have any ideas on this or maybe a better way to solve this? Here are the code snippets:.....................
We are converting apps to Android from .NET
Is there a Java equivalent of the .NET Path.Combine() function?
Currently we check the / on each folder etc before building paths.
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.
View 4 Replies View RelatedI made a webview.addjavascriptinterface(geo, "geo"); to access the geo class from javascript, and, in the html-javascript I write: --------- function successCallback(p){ document.write("helo"); }
View 3 Replies View RelatedHow can I retrieve the java script function value from a web page loaded withing a webview component?
View 1 Replies View RelatedIs there any built-in function available in java for removing contents (ex: white space) between XML tags: <student> <name>miya</name> <number>12</number> </student> I want to convert the above document as: <student><name>miya</name><number>12</number></student> by removing the white space?
View 2 Replies View RelatedI try to learn java for android devices. i have to create the update function. But still have one question: How?
in class root
public void update(){maindebug("update"); // This is my debug function}
public void run(){ while(isRunning){ // isRunning is a boolean variable
SystemClock.sleep(100);
update();}}
and inside onCreate run(); but it doesnt work.
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:......................
1) I am developing my app in Eclipse 3.4.1 with Android (ver 1.1_r1) plugin. My app compiles and executes without errors when using the Eclipse IDE.
However, when I export my app (unsigned) using Eclipse (via {select project} >right-click>Android tools>export unsigned application package), sign it, and try to run it on the Emulator, it throws a runtime error when I try to update my sqlite database, at which time the specific error created is: SQLite error#14, unable to open database. It is able to read from the database without problems. (I have also verified that the database is: open, is not readonly, is not locked by another thread, is not in the middle of a transaction.)
I have limited experience, but this seems more like a "system" problem given that the app works OK in Eclipse IDE but then fails as an exported/signed apk. Some googling of SQLite resources revealed a similar error on a non-Android platform which was fixed by: "Set your permissions correctly on /var/tmp, or whatever directory you are using to hold temporary files".
Does Android have temporary files, and if so how does it handle permissions on temporary files? Is there a way to check or set these permissions to see if this fixes my problem here?
2) Not sure if it is related, but after I have run the exported/signed app which causes the runtime error, if I reboot the Emulator, and try to run the program using the Eclipse IDE , the program fails with the same exact error. PLUS I also noticed the following error message while the program is installing/running: 03-01 22:22:29.282: ERROR/PackageManager(53): Package com.northwestradiology has mismatched uid: 0 on disk, 10019 in settings; read messages:
I can restore the Eclipse version of my program to be able to execute without runtime errors by utilizing the -wipe-data option for the emulator. But note that if I run my signed APK using an emulator created with the -wipe-data option, it still throws the runtime error listed above...
Following the examples given by Johns Trevor in order to secure Android LVL Applications (http://android-developers.blogspot.com/ 2010/09/securing-android-lvl-applications.html), I've been stuck on one only particular issue. Indeed, here is the matter: The most obvious mechanism is to use a lightweight hash function, such as CRC32, and build a hash of your application's code. You can then compare this checksum with a known good value. You can find the path of your application's files by calling context.GetApplicationInfo() - just be sure not to compute a checksum of the file that contains your checksum! (Consider storing this information on a third-party server.)
Howether, I can't find what I must use in my code to detect an "unwanted" modification inside it.
java.util.zip.CRC32 crc32 = new java.util.zip.CRC32();
crc32.update(whatPutInHere);
I've tried many method related to context.GetApplicationInfo() but no one seems to deliver something that change as soon as the code is modified. Has someone already succeed on CRC32 checksum implementation?
How do i check MD5 Checksum before flashing a rom?
View 2 Replies View RelatedOn-Phone ROM Checksum Verifier
Download: MD5-Checksum-v2.2.apk (new version!)
Changes in the 2.2 version include:
1. Larger rows and font for easier/better file-selection
2. Sorted list of files displayed in file-selector
3. Retain directory between each file-selection
4. Verify read-access of selected file to prevent force-close
5. Test file's suffix to warn if non jar-type file is selected for jar-verification
6. Add menu support (help, change log, acknowledgements)
Download: MD5-Checksum-v2.1.apk
This version is detailed in a post over at XDA (xda-developers - View Single Post - [Begging] Devs - please publish your MD5's) but its highlights are as follows:
- Still includes all of the functionality of the previous versions
- Now includes two jar file verification functions (they both basically do the same thing; radio button JV1 selects an explicit jar verification (read jar, calculate SHA1 digest, compare to manifest); radio button JV2 just uses the implicit JarFile Java method of jar verification and is much faster since its not doing a second, separate validation (23 seconds for method JV2 on a 100MB ROM vs. 2.5 minutes for method JV1 (all on my Droid X)).
- Now has a file-selector instead of requiring manual filename text input (you can still do this too)
Download: MD5 Checksum v1.1.apk (free!)
Download: checksumdb.txt (save to either /sdcard/download or /sdcard)
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I have currently been testing the method of rooting leaked 2.1 phones. There was a little discussion running in that thread (and other threads, I've found) that poses the question whether or not the RUU is the same as 2.1 Leak v3. The RUU I'm using is referenced here: [ROM] Official HTC Desire RUU ROMS and OTA Update URLs - xda-developers - which can be found here:
http://shipped-roms.com/shipped/Desire/RUU_Desire_C_Verizon_WWE_2.36.605.1_release_signed _with_driver.exe
Leak 2.1 v3 I'm using is referenced here: HTC DROID Eris OS 2.1v3 download -- which can be found here: PB00IMG.zip. So, the process that I've been using to root these phones involves flashing the RUU OTA onto the phone. With some help from user bftb0, I have taken the time to do the analysis. How did I get system.img and boot.img off of the RUU OTA, you might ask? Well, after I flashed the RUU OTA onto the phone, I went through the Incredible/Slide root method to root the phone I'm working with (without changing any phone settings within Sense).
After getting adb to recognize the device in recovery, I took the steps necessary to flash Amon_RA's recovery. I then took a Nandroid backup of my phone and extracted the system.img and boot.img files off of the SD card where the Nandroid backup was stored. Then, I used unyaffs to unpack system.img into 2 separate directories, and used split_bootimg.pl to unpack boot.img. So, for split_bootimg.pl I did this, starting at the directory where each respective boot.img file is:
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I just spent half an hour going through each file in the OTA upgrade ZIP and comparing its CRC (checksum) to the same exact file in the "leak v3" PB00IMG.ZIP, including all of the files inside system.img. Process: First off, just by opening the two ZIP files with 7-Zip I can see that the boot.img, radio.img, and recovery.img are identical. In both ZIPs, their CRCs are EA7388FA, 54C41EEC, and 3F0153F1 respectively.
Since the OTA breaks down system.img into just the files that need updating (for the purpose of keeping the file size as low as possible), the only way to compare the files with system.img in "leak v3" was to use the root ROM created from "leak v3". (Thank goodness there's an unadulterated ROM of it, so the original CRCs are intact!) One by one, I compared the CRCs of the files in the OTA's system folder with the same files in the "leak v3" system folder. Findings: The files that are in the OTA are completely identical to the ones in the leak v3 system.img, with only one exception: The OTA contains an additional app called UpgradeSetup.apk. Obviously, it's only necessary for executing the upgrade..............