Android :: Android Bluetooth Crashes Application When Remote Device Closes Socket
Feb 16, 2010
I have connected my Android application to a Windows desktop machine via Bluetooth. The application interacts with the machine. At the end of the interaction the application on the desktop closes the socket that was opened between the Android and the desktop application. Right when socket.close() is called on the Windows machine my Android app pops open a dialog saying that the application has stopped unexpectedly and then it quits. I have a breakpoint on the line in the ConnectedThread (like in the BluetoothChat sample) where I read the InputStream on the Android and that is not hit. I also have a breakpoint in the catch statement for the try surrounding the place where I read the InputStream. That one also does not get hit. So I have no idea how I can catch this error. Is this a bug?
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Jul 16, 2010
I'm trying to understand remote services at the moment and everything works fine, i can start the service and know how to communicate with it through the AIDL-interface. My problem is that the service seems to still run in the same process like the activity it was started from, because the activity crashes too, if there is an error thrown in the Service.
I set the service process to remote ( android:process=":remote" ) so what am i doing wrong? Or what do i have to do to unbind the service-process completely from the activity-process?
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Sep 20, 2010
I have registered a Receiver component for ON_BOOT_COMPLETED broadcast, in my application. The receiver does just prints a line in its onReceive() callback. However, when I boot the emulator(by executing Run as->Android application command from Eclipse) and unlock the screen on start up, I get an ANR dialog displayed in my Application. Following are the exceptions logged:
CODE:.............................
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Jul 15, 2010
I am writing an Android app that should exchange data to a server over Bluetooth, with the server side on a PC running Ubuntu, using the bluez library, in C (or C++).
My Android app fails (IOException) when I try to connect to my server socket on the PC.
Here is essentially what I in the java code (in Android, full eclipse project here: http://dl.dropbox.com/u/2968234/ThinBTClient.zip)
CODE:...........
This throws IOException after a timeout of 10seconds or so.
On the server side (in Ubuntu 8.10), I basically set up a Bluetooth server socket, along the lines described in the example bluez/sdp-register.c
Down below is my C++ program. To compile it do
g++ -I/usr/include/glib-2.0/ -I/usr/lib/glib-2.0/include -o bt_server bt_server.cpp -lbluetooth
I can do the reverse succesfully, i.e. create a server socket in Android and connect from Linux, however this is not what I want to do!
I think either the problem has to do with my config of Ubuntu.
CODE:................
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Nov 8, 2010
I want to create an application that can be interactive with another Android device that could be across the room or across the country. For example, imagine playing Tic-Tac-Toe; but I'm the X's on my phone and the O's are my brother on his Android phone. I think it can be done via application specific messaging. Looking to see if it is possible, and, if so, how to send a message from one application to another on another device.
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Apr 15, 2009
I am trying to create a tcp connection between the android emulator and remote PC. when i use the local host i can able to connect but remote host i could not able to connect. firewall disabled
for remote host i used the stcppipe for forwarding
Enter the Android tools path and run: adb forward tcp:40 tcp:40
stcppipe.exe -b 192.168.0.85 127.0.0.1 40 40
but my emulator application could not able to connect. what could be the reason.
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Jul 28, 2010
I need to be able to start and application when l press a bluetooth device that l have. Can this be done? Was thinking of registering a service to listen for the bluetooth device and when l hit a button on the BT device l can then start the application.
Would this work?
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Jul 11, 2012
I am writing a proxy in Android. I want to know, how one may detect if the server or client has closed its socket? I am using pre-NIO sockets. It should be noted that, the YouTube App will connect with my Proxy server (I have installed proxydroid) and then data will pass between YouTube App and Youtube Server through my proxy.
I have used read() method for reading. When I am reading (with read() ) as a client (from the server) if I get -1, does it mean that the server has closed the socket?
In the same way, If I am reading (with read()) from the client and get -1, does it mean that the client has closed the socket?What is the best way to detect if a remote peer has closed the socket or not?If I use methods like isInputShutdown() or isOutputShutdown() ?My main goal is read into a byte array until the remote peer has closed the socket?
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Nov 11, 2010
I'm creating an application that uses an android to send and receive data via bluetooth. but I'm having problems when creating the socket. He gets caught in that line mmSocket btserver.accept = (); And I can not pair with any device.I have another doubt, I can make that communication with an android and a symbian?
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Jun 13, 2010
I'm developing a program in which, from an Android Phone, I have to connect as a client to a Bluetooth medical sensor. I'm using the official Bluetooth API and no problem during connection (SPP profile), but when I end the socket, the sensor is still connected to my phone (although I have close the connection).
Are there any way to make a Bluetooth disconnection? I think there is an intent called ACTION_ACL_CONNECTED, which does that. Can anyone explain me how to use this?code...
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Apr 22, 2010
So i have a app that runs fine on the emulator but crashes (force close message as soon as i open the app) on every device i have tested it on. How can i see whats going on? what could be going on?
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Sep 26, 2010
I made an app thats use the camera. The first problem i get was that i can't use portrait preview without the rotation 90º image. I used the solution (landscape for all), but now, only in the real device, when i start the app and i have the device in portrait mode it crashes (need to force close) and only after reboot the phone its possible to connect to camera, even in the camera app.
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Nov 19, 2010
I'm trying to bring up the standard window for Bluetooth Settings (with Device name, Discoverability etc). However, general approach with startActivity(intent) ends with NullPointerException pointing to BluetoothSettings.java onCreate:135. Checking with the Android code, I've found that at line 135 they get some extras from the intent. So I prepare the same extras (names I've found in android core BluetoothDevicePicker interface) and issue it -- the same effect with NullPointerException. Might be the wrongs names of the extras I prepare? So is there a way I can see those extras (with names especially) from the intent the system itself submits when I open Bluetooth Settings manually acting like a user. Code...
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Jun 29, 2010
We have a simple client server architecture between our mobile device and our server both written in Java. An extremely simple ServerSocket and Socket implementation. However one problem is that when the client terminates abruptly (without closing the socket properly) the server does not know that it is disconnected. Furthermore, the server can continue to write to this socket without getting any exceptions. Why? According to documentation Java sockets should throw exceptions if you try to write to a socket that is not reachable on the other end!
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Nov 12, 2009
Essentially Im trying to get many many java clients connect to a socket on my ColdFusion server (Using the Socket Gateway). However before i even start to code this, Im a little confused about sockets and their performance. First of all, are sockets meant for many(1000+) clients connecting to one socket (say port 2202) on one server? How is the performance if all there waiting for is basically a ping, or something such that when these clients receive this "ping" they can go get some new data.
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Apr 10, 2010
there is software to convert Bluetooth to IR signals or vise-versa? It would be great to have an app to be able to use the Android phones as learning universal remotes. Would it be a hardware issue? I have an Sprint HTC Hero if it matters.
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Mar 23, 2011
I am looking for a way to remote control my android device (Motorola Xoom & Motorola Droid). I assume this will have to occur via Bluetooth but I am open to any option (wifi?)I'd like the following functionality in the remote:
- Launch Music Player
- Launch Maps / Navigation
- Play / Pause / Next Track / Previous track
- Launch Voice Search
- Launch text search
The official motorola Xoom Bluetooth keyboard has physical buttons for many of these operations (maybe not navigation or voice search) but this device is far too large to use as a 'remote'
My ideal situation would be to find a small Bluetooth remote designed for something like this. I've been looking at getting a Wiimote and the app that allows you to map its keys to keystrokes. Are there keyboard shortcuts for these operations?
I also noticed many of the keyboard shortcuts require the 'Search' key (i.e. Search+'b' launches the browser). What if I got a generic bluetooth keyboard without a 'Search' key - what is the alternative keypress?
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Aug 10, 2011
I am looking for a way to remote desktop my android phone (atrix) from my honeycomb tablet. Preferably over LAN, as I only really do it at home but not really close enough for bluetooth, however with bluetooth I could make do. Something like what the atrix can do with the dock.
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Oct 7, 2010
I am facing problem to establish a socket connection from android device to PC's a specific port like 8080. I just want to create a socket which will connect to the specific port and also write some data stream on that port.I have written some code for this purpose.
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Sep 5, 2010
I have coded this service, that computes stuff and i want other applications to be able to bind this service, i.e. i want to enable other programmers to communicate with this service. problem is, this has to work without these other programmers to get access to the source code. just the (installed) apk with the remote service is given (and of course a detailed description of the service' interface)...problem is, eclipse keeps braggin' about that the packages of the service are not available in source code...
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Aug 25, 2010
I managed to configure iJetty on the emulator and I am setting up both a REST-based and SOAP-based services on it.
Regarding sqlite3. I am able to run and control it remotely using the shell. is there a way to generate databases on the device using the remote tool? I didn't find any evidence that that is possible and I think the only way may be through the API. I just wanted to double check in case I missed this.
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Sep 12, 2010
I am new to android development and I have made this using help from a website. The XML files dont have any errors,Here is my Main java code: package com.CFConverter;
import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.widget.EditText; import android.widget.RadioButton; import android.widget.Toast;
public class CFConverter extends Activity {
/** Called when the activity is first created. */ private EditText text;
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text = (EditText) findViewById(R.id.EditText01);
} //This Handler is called when we click the button01.
public void myClickHandler(View view) //passing the current view {
if(view.getId()== R.id.Button01) {
RadioButton celsiusButton = (RadioButton)findViewById(R.id.RadioButton01);
RadioButton farhrenheitButton = (RadioButton)findViewById(R.id.RadioButton02);
if(text.getText().length()==0) { Toast.makeText(this, "Please Enter a Valid Number", Toast.LENGTH_LONG);
return; } float inputValue = Float.parseFloat(text.getText().toString());
if(celsiusButton.isChecked()) { text.setText(String.valueOf(convertCToF(inputValue)));
// calling function to convert } else {
text.setText(String.valueOf(convertFToC(inputValue)));
} return; } } private float convertCToF(float fahrenheit) {
return ((fahrenheit - 32) * 5 / 9);
} private float convertFToC(float celsius) {
return ((celsius * 9) / 5) + 32;
} }
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Sep 11, 2009
We have had a couple users on the myTouch phone have issues in our application. It apparently is force closing on them. I am not sure of why it is, and the 1.6 SDK is not out yet. Has 1.6 been released into the wild? If so, do you know where I can download the image for my G1 dev phone to test w/?
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Nov 11, 2012
how to setup a infrared remote control to use with android instead of keyboard or mouse.I thought in lirc but the several ports that I found for android are working to send infrared signals, not to receive them.I was wondering if there is some project or program to allow infrared remote controller manage the android device.
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Mar 31, 2010
I am trying to display the image on the ImageView object. But the setImageResource fails to display the image. Here is my XML file looks like:
<?xml version=*"1.0"* encoding=*"utf-8"*?>
<LinearLayout xmlns:android=*"http://schemas.android.com/apk/res/android" *
android:orientation=*"vertical" *
android:layout_width=*"fill_parent" *
android:layout_height=*"fill_parent"*>
<FrameLayout
android:orientation=*"vertical" *
android:layout_width=*"fill_parent" *
android:layout_height=*"fill_parent" *
android:layout_weight=*"1"*>
<ImageView
id=*"@+id/batteryLevelview"*
android:layout_width=*"wrap_content"*
android:layout_height=*"wrap_content"*
android:layout_gravity=*"center"*/>
</FrameLayout>
</LinearLayout>
Here is my code:
@Override
*public* *void* onCreate(Bundle savedInstanceState) {
*super*.onCreate(savedInstanceState);
setContentView(R.layout.*main*);
ImageView batteryLevelImage = (ImageView) findViewById(R.id.* batteryLevelview*);
batteryLevelImage.setImageResource(R.drawable.*notconnected*);
}
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Dec 23, 2009
I am a brand new developer to Android. I wrote a pretty simple application that uses the gesture library. The application itself seems to run fine in the simulator. However, when I installed the application on my Google Dev Phone 1 (G1) last night, it doesn't seem to work. I've upgraded my G1 with the 1.6 image from the htc developer site. I see the first screen/activity for about a second and the application exits without and errors. Here is what my manifest looks like:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.blahblah" android:debuggable="true"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_CONTACTS">
</ uses-permission>
<uses-permission android:name="android.permission.CALL_PHONE">
</uses- permission>
<application android:icon="@drawable/icon" android:label="@string/ application_name"> <activity android:name="Gesture1Activity"
android:label="@string/application_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="Gesture2Activity"
android:label="@string/label_gesture_list" />
<activity android:name="Gesture3Activity"
android:label="@string/label_create_gesture" />
</application>
</manifest>
Here's the output for logcat:
D/AndroidRuntime(860): D/AndroidRuntime(860): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<< D/AndroidRuntime(860): CheckJNI is OFF D/AndroidRuntime(860): --- registering native functions --- I/jdwp (860): received file descriptor 20 from ADB D/ddm-heap(860): Got feature list request I/ActivityManager(101): Starting activity: Intent { flg=0x10000000 cmp=com.blahblah/.Gesture1Activity } D/AndroidRuntime(860): Shutting down VM D/dalvikvm(860): DestroyJavaVM waiting for non-daemon threads to exit E/AndroidRuntime(860): ERROR: thread attach failed D/dalvikvm(860): DestroyJavaVM shutting VM down D/dalvikvm(860): HeapWorker thread shutting down D/dalvikvm(860): HeapWorker thread has shut down D/jdwp (860): JDWP shutting down net... D/jdwp (860): +++ peer disconnected I/dalvikvm(860): Debugger has detached; object registry had 1 entries D/dalvikvm(860): VM cleaning up D/dalvikvm(860): LinearAlloc 0x0 used 677572 of 4194304 (16%) W/InputManagerService(101): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub $Proxy@439a9eb8
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Sep 29, 2010
I've narrowed down the problem to WebView; my application force closes every time. If I take out the WebView and put in a color change button or something, the case switching works and the application loads. I'm fairly new to the plaform, but I'm (mostly) copying directly from examples here for WebViews.
CODE:........
main.xml
CODE:............
AndroidManifest.xml
CODE:.................
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Feb 16, 2010
My code is based on the BluetoothChat sample from the API. I connect to another device just fine and I can read and write to the connection no problem. But then if I turn the device the orientation of the UI changes automatically. After this, if I try to write to the Bluetooth connection, my application crashes!
It seems weird that the orientation of the screen somehow affects the Bluetooth. I am new to Android, and I am not yet sure about stuff like when I should be saving and reloading the application's state. Is this one of those times? Does changing the orientation of the screen somehow reset the application's state?!
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Nov 16, 2010
intentTest.java:
package intentTest.xyz.com;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button
public class intentTest extends Activity {
Button b;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
b = (Button) findViewById(R.id.b);
b.setOnClickListener( new View.OnClickListener() {
public void onClick(View view) {
Intent intent = new Intent(intentTest.this,seond.class );
startActivity(intent);
}});
}}
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="First screen"
/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="click"
android:name="@+id/b"
/>
</LinearLayout>
seond.java:
package intentTest.xyz.com;
import android.app.Activity;
import android.os.Bundle;
public class seond extends Activity{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
} }
second.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="second screen"
/>
manifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="intentTest.xyz.com"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".intentTest"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".seond"></activity>
</application>
</manifest>
I get the following error code:
11-16 01:26:07.156: ERROR/AndroidRuntime(779): Uncaught handler: thread main exiting due to uncaught exception
11-16 01:26:07.166: ERROR/AndroidRuntime(779): java.lang.RuntimeException: Unable to start activity ComponentInfo{intentTest.xyz.com/intentTest.xyz.com.intentTest}: java.lang.NullPointerException
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.app.ActivityThread.access$2100(ActivityThread.java:116)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.os.Handler.dispatchMessage(Handler.java:99)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.os.Looper.loop(Looper.java:123)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.app.ActivityThread.main(ActivityThread.java:4203)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at java.lang.reflect.Method.invokeNative(Native Method)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at java.lang.reflect.Method.invoke(Method.java:521)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at dalvik.system.NativeStart.main(Native Method)
11-16 01:26:07.166: ERROR/AndroidRuntime(779): Caused by: java.lang.NullPointerException
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at intentTest.xyz.com.intentTest.onCreate(intentTest.java:18)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
11-16 01:26:07.166: ERROR/AndroidRuntime(779):
... 11 more
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Dec 7, 2009
I want to use a map in my application but I can't get it to run.
It always crashes with the following error:
CODE:.....
My XML file:
CODE:...................
My layout:
CODE:...............
In my code I add the map like this:
CODE:.............
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