Android :: Reflection Fails On Large Class / What To Do?
Jun 15, 2009
Does dalvik have any limitation it puts on classfiles, mainly size related? In groovy we have a huge class thats need to be able to be reflected upon, but it silently fails. IE theres no error during build(dex) or load time but calls to the reflective methods throws a no such method exception. This file is above 13000 lines of code and contains a vast number of methods so size limitations seems probable, or are there any other ways reflection can fail for a normal java class? Oh, and cutting the file down in size made it work but is not optimal since it contains all of groovy's utility methods.
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Nov 5, 2010
I'm writing an android app that requires binding a JSON object into a domain entity with the keys from the JSON as instance variables. Since there are several domain entities, each with different instance variables that the JSON needs to bind to in the app, i'd like to write a method such as ths following: Loop through all the instance variables from the domain if a key exists in the JSON with the name of the instance variable, take the value for this key from the JSON and set the Domain's instance variable with this key name equal to this value. The reason i'm interested in the doing the binding from the class to the JSON is because if the JSON changes for some reason, I don't want it to break the app when the instance variable doesn't exist in the app's domain for a specific JSON key. Code...
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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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May 7, 2014
I've been going over the android sdk for the past year to find out if there is a way to change the network type(2g/3g/4g), in phones with root access.However I couldn't find any way to do this.Asking around,someone told me that I could do this using reflection,by calling a method on a phone instance.Looking through the source code,I did find a setPrefferedNetworkType(); method in the Phone Interface,inside the internal telephony package.Is there anyway I can use this to solve my problem.I can't seem to find a way to get an instance of a class that implements the interface.Or is there any other way to do it entirely?
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Jul 9, 2010
i have a severe problem with eclipse, where i need to compile a somewhat larger class. by "larger" i mean, the class has about 5000 lines of code... problem is that on saving this project, eclipse takes several seconds (30-40) to "build the workspace". to be exact, it says "50%" and keeps saying that for 30-40 seconds. then, it breaks with the following error:
[console]:
[2010-07-09 15:28:39 - Dex Loader] Unable to execute dex: null
[2010-07-09 15:28:39 - myProject] Conversion to Dalvik format failed: Unable to execute dex: null
[problems window]:
Conversion to Dalvik format failed: Unable to execute dex: null this error is reproducible and keeps popping up until i comment out several thousands LOC, so that the file still has this 5k LOC, but ~2000 of them are comments. THEN it works...
i know that 5000 LOC are no really good programming style, but i need to do it this way for now ... (i have to write this much records to a sqlite database and since sqlite doesnt feature multiple sql-queries in one rawQuery-command i have to execute a single rawQuery() for each and every data record i need to push into the db.... - until i write a file reader to read this data from a file (that needs verification etc)), i'm stuck with this solution...)
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Oct 23, 2009
I want make it support multiple screens(small,normal and large).I am 100% sure the all of layouts are working perfectly now, but large screen,the problem is that all XML files of layouts in layout-large can't load,The platform always load default XML file(these are under layout folder) at large screen environment.
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Jul 30, 2010
I currently have an app on the market that supports Android 1.5 (SDK level 3) and up. It also takes advantage of several features that are only present in Android 2.0 (SDK level 5) and up. I do this using Reflection.
I read a post on the Android Developer Blog that talks about how to support these new features while using no Reflection, which would be amazing. http://android-developers.blogspot.com/2010/07/how-to-have-your-cupcake-and-eat-it-too.html <uses-sdk android:minSdkVersion="3" android:targetSdkVersion="5" />
I have tested this out and while it works there is one huge downfall. Currently if I try to add a SDK level 5 class, but I don't know that it's a SDK level 5 class, there is no worries. Eclipse isnt going to find the class and I'm not going to be able to add it.
Using Google's recommended method does allow me to add the classes and gives me no notification that this code is targeted just to SDK level 5 users. This opens up too big of a possibility of adding in code that would break some users without knowing.
Does anyone know of any plugins, options, etc that would warn me at the places I have targeted SDK level 5 to keep this from happening?
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Jun 1, 2010
I have been trying to use reflection for a specifiec Field in the android.os.build class, the MANUFACTURER field...
I have tried by using this code :.............
I am gettign the following errors :
code:..........
And when debugging I noticed that InvocationtargetException is continuesly thrown, so I am guessing I haven't been implementing the whole Reflection principle correctly...
Any idea where things are going wrong or otherwise on how to implement Refelction for a single Field correctly ?
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Feb 17, 2013
I work at a small company that fields autonomous android devices which programmatically connect to bluetooth telemetry devices. These devices require pins, so we need to automatically create a pairing in order to connect to the bluetooth devices. We DO have root access.
Since the new Bluetooth Stack in Android 4.2, I have been unable to use this common AIDL bluetooth reflection method in our private utility app:
Code:
public IBluetooth getIBluetooth() {
IBluetooth ibt = null;
try {
Class c2 = Class.forName("android.os.ServiceManager");
Method m2 = c2.getDeclaredMethod("getService",String.class);
IBinder b = (IBinder) m2.invoke(null, "bluetooth");
[code]...
The issue about this strategy no longer working is documented here. I previously used the setPin method as well as the createBond method from this Interface, and now I cannot.
Is there anyway to manually create a bluetooth pair profile under Android 4.2? Is there a database file where the profiles are stored that we can use root and sqlite3 to access?
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Jul 7, 2010
I'm creating a new class, using eclipse "New Java Class" dialog box. I can write the superclass I want (I can't find using "browse" button), but I can't write or select an interface to implement. I click "add" but ther is nothing to select. What I'm doing wrong?
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Jul 14, 2010
I'm just getting into Android development, and I have a question about communicating between a receiver class and an activity class. I'm very new to JAVA and Android so I hope I don't sound too stupid. I'm developing an application where I intercept an SMS message and then based on various elements of that SMS I might delete it once it's been saved to the inbox. I have a receiver class that intercepts the txt message, and I am also able to delete messages from my inbox with code in the activity class using a button at the moment. The problem I have is communicating between the receiver class and the activity class where the code to delete a message resides. I tried putting that code directly into the receiver class but as I'm sure most of you already know the BroadcastReceiver class doesn't seem to support what I need to delete messages. I've been searching for an answer to this for a while, but haven't been able to find anything. Honestly I'm not sure I know enough about JAVA and Android to even recognize a solution if I saw it.
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Jun 27, 2010
What I want to do, is be able to access the object neoApi inside the Neoseeker class, from its inner class RunningTimer. Now, in my code, you can see what I would think to work, but when I run my application, nothing pops up. Nothing inside my TextView, no Toast, nothing at all. How can I remedy this?
package com.neoseeker.android.app;
import java.util.Timer;
import java.util.TimerTask;
import org.json.JSONObject;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;.......................
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Sep 8, 2010
I'm new to Java and android development. In my application I need data which is accessible for a few activities. I've read that a good solution is to use Application class for this. So I use it like this:
public class MyApplication extends Application {
private String str;
public String getStr(){
return str;
}
public void setStr(String s){
str = s;
}
}
and I can access this variable from activity like this:........................................
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Oct 8, 2010
I have just started android. I just want to know that how can i call activity class from other java class. i just want to pass class object to activity class.
public class GsonParser extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MagazineThread thread=new MagazineThread();
thread.start();
}
public GsonParser(JsonMagazineParser Obj)
{
}
}
and i am just doing like from other class. GsonParser obj=new GsonParser(this);passing obj to activity class.how can i achieve that.
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Apr 23, 2010
In my app in one package there are some classes. from those classes i want to run one class that is the Gps functionality class. i want to run that class in background. how i do it, i don't know. i am not able to make it solve from any document. if anybody knows the way to solve it please me by run a "hello world" app in the background. i am not able to solve this problem by going through document.
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Jul 20, 2010
I'm building a small Android application, but this is more of a Java question than an android question. Looking through the tutorials there are lines that look like: startService(new Intent(this, MyService.class));
What exactly does the "MyService.class" field represent? Is that just a reference to the class for a template?
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May 19, 2009
I made a Dialog Class with it's view classI want to pop up the dialog when I got some packets from network. so I made a Thread which parses packets and then I made if clause in Run() method There is no problem with parsing packet but when I enter "if clause" and call showDialog() I got Error message
Is there anyone who knows how to pop up a dialog from different thread?
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Nov 1, 2010
I created a method called insertTable in a class called Table but i can't use it in my onClick method in the main class :
CODE:.......
I want to do a income.insertTable in the onClick method but eclipse say that i need to create a local variable.
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Oct 15, 2010
if there are five text in a text view and we want to pass one of them on click event to the next class text view which method i m used on android
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Nov 3, 2010
i hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..
In 1st activity class
package org.me.intent_testing;
import android.app.Activity; import android.os.Bundle; import android.widget.; import android.view.; import android.content.Intent;
/** * * @author pavankumar */
public class FirstActivity extends Activity {................
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May 13, 2009
I have upgraded my phone's images to Android 1.5 images (from http://www.htc.com/www/support/android/adp.html) Now when I try commands like adb remount, chmod, adb push etc I get "Operation not permitted" and "Permission denied" errors
I was able to give this command when I had 1.0 images flashed on my phone.
Has something related to permissions changed with Android 1.5?
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Apr 16, 2010
I'm trying to do is open a very simple application that is supposed to do nothing but display an imageView above a textView. The application worked fine until I added the imageView so I'm assuming my problem has something to do with that.
Here is the code:
CODE:............
Here is my layout -> main.xml
CODE:....................
When I try and run the app in Eclipse through the Emulator the emulator gives me the following error:
The application Application Name (process.com.isi.sa) has stopped unexpectedly. Please try again.
The Console log in Eclipse shows the following messages:
CODE:.......................
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Jan 6, 2010
When I try to install the android SDK it fails to install.
My OS is Windows XP. I just downloaded and installed Java JDK 1.6 Java -version from the command line returns: http://stackoverflow.com/questions/ask java version "1.6.0_17" Java(TM) SE Runtime Environment (build 1.6.0_17-b04) Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)
My environment vars have: JAVA_HOME=c:progra~1javajdk1.6.0_11. I downloaded android-sdk-r04-windows.zip. I unziped it in V:AndroidInstall
When I go to the V:androindinstallandroid-sdk-windows> and type "SDK Install.exe" nothing happens...If I go this from graph
When I do this from a graphical file viewer I get a quick flash that looks like a command line window and nothing....
When I try to run android list targets from the tool directory I get:
Error: Error parsing the sdk.
Error: V:androindinstallandroid-sdk-windowsplatforms is missing.
Error: Unable to parse SDK content.
So the basic install setup is not happening.
Additional clues:
I have a G1 and Android 1.0 was running on this machine. (Almost a year ago) I've updated my G1 to 1.6 so I thought I'd update my SDK before starting new development.
When I tried to upgrade it tried and then died as the "directory was in use"
So I cleaned out all the android directories, rebooted and redownloaded everythign from scratch.
Now it won't run at all.
I've clearly got something in an unhappy state, but I've cleaned up all the directories and no remanants seem to be running I've rebooted....
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Feb 28, 2009
I'm using the SAX parser to read some RSS feeds and have found a problem. Some feeds, for example CNN Money Top Stories, have embedded some characters in their content, i.e. the copyright symbol. Well, that's not valid XML and the SAX Parser fails with an exception "invalid token". The only help I have seen given is to fix the XML at the source and that's not an option obviously. So, I can think of 2 options and they both stink:
(a) read the content first, scrub it, and then pass it to the parser.
(b) Use DOM instead of SAX.
What I *want* to do is make the parser a little more forgiving and just accept or discard/ignore the bad text. I'm not have any luck with setErrorHandler. My error handler does not get called.
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Sep 10, 2009
I'm trying to build a simple video recorder for an Android device and I've had limited success and mixed results. It worked once, but now, without changing anything, I'm getting a "Camera is not available" error followed by "prepare failed -2147483648" error.
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Sep 24, 2010
I recently upgraded my SDK from 7 to 8. One of my applications uses Google GeoCoding, specifically the Geocoder object. After the upgrade, when I call the getFromLocation method, it doesn't return any addresses and I see a message in the logcat to the effect that GLS failed with status 20. My Google Maps API key is working fine because I'm seeing the map tiles, but GeoCoding is broken. It works fine if I run a previous (SDK 7) build of my app.
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Oct 3, 2010
I want to upload an upgrade in the market. But when I upload the apk and new images and click save or publish everything is lost when I return to the listing (the old apk and images are restored). The only thing that changes is the saved versioncode of the app. Is there something broken?
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Sep 11, 2010
The following code works when I either have no min sdk version specified in the app manifest or if it's 5 or greater. But if I set the min sdk level to 4 (Android 1.6) , it fails to create a subdirectory in the sdcard.
There is no error. mkdir() or mkdirs() just returns false.
CODE:....
Am I doing something wrong here? Or is this a bug? I'd prefer not to set the target to 2.1 and min version to 1.6. But right now, I have to set it to 2.0 for it to work.
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Apr 28, 2010
I use the following code to create a folder "mymir" and a file ".nomedia" (in the mymir-folder) on the sdcard of an android unit. However, somehow it fails with the exception that the folder the ".nomedia"-file is to be placed in dosn't exist.
Here's the code:
CODE:....................
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Jul 30, 2010
I am brand new to developing for android and have hit something of a stumbling block that I cant seem to get around.
Using the NotePad example, I have created my own ContentProvider to serve up data from a database that I will eventually host on a webserver. But that is lightyears away from where I am right now.
Just testing my ContentProvider has caused a bit of a headache that I cant solve. For some reason, when the provider calls SQLiteDatabase db = mOpenHelper.getWritableDatabase(); I get a null pointer exception.
Code Follows:
CODE:............
Stack Trace
CODE:......................
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