yes it's:
"// Get a set of currently paired devices
Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();
"
So i wonder what's about it.
Just a question about the Log.e and Log.d....
i added this:
if (D) Log.d(Tag, "in onCreate()");
if (D) Log.e(Tag, "onCreate()");
if (D) Log.i(Tag, "onCreate()");
Am i getting it right? because i can't see how the three are different (e:
Error, I: information, ....) if it's me who has to specify the displayed
message...for example: "in onCreate" message.
On Sun, Feb 26, 2012 at 2:07 PM, YuviDroid <[email protected]> wrote:
> Uhm....the "root" of the error is at that line 87 of your BTD...Activity.
> What's at that line?
>
> is it: Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();
> ?
> ant it might be that mBtAdapter is null (by reading the docs it says that
> BluetoothAdapter.getDefaultAdapter() returns null when bluetooth is not
> supported -
> http://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#getDefaultAdapter()
> ).
> Maybe you are using the emulator to run this? (AFAIK the emulator doesn't
> support bluetooth)
>
> so, just add a if (mBtAdapter != null) { ... rest of your code .. }
>
>
> On Sat, Feb 25, 2012 at 10:19 PM, Mohamed Gougam <[email protected]>wrote:
>
>> Hello,
>>
>> You mean this part of the log:
>>
>> "02-23 18:35:35.985: E/AndroidRuntime(228): Caused by:
>> java.lang.NullPointerException
>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>> android.mgo.helloandroid.BTDdetecetwithV7Activity.onCreate(BTDdetecetwithV7Activity.java:87)"
>>
>>
>> The program doesn't stop at that point !!
>>
>> i was looking at this one:
>>
>> "02-23 18:35:35.985: E/AndroidRuntime(228): java.lang.RuntimeException:
>> Unable to start activity ComponentInfo{android.mgo.
>> helloandroid/android.mgo.helloandroid.BTDdetecetwithV7Activity}:
>> java.lang.NullPointerException"
>>
>>
>> On Sat, Feb 25, 2012 at 11:43 PM, YuviDroid <[email protected]> wrote:
>>
>>> As the log suggests the NullPointerException occurs at line 87 of
>>> BTDdetecetwithV7Activity.java.
>>> Take a look at that line and see what might be wrong..
>>>
>>>
>>> On Sat, Feb 25, 2012 at 8:21 PM, Mohamed Gougam <[email protected]>wrote:
>>>
>>>> Hello,
>>>>
>>>> I used The Log.e and Log.d in many places in the code including in the
>>>> onCreate method and i found that the error is there and it's not going any
>>>> further beyond it...
>>>>
>>>>
>>>> Still don't know what's wrong though.
>>>>
>>>>
>>>> On Thu, Feb 23, 2012 at 11:40 PM, Mohamed Gougam
>>>> <[email protected]>wrote:
>>>>
>>>>> Hello Moktarul, sorry for the late reply, i was playing around with
>>>>> the onCreate since you said you think that the source of the bug most
>>>>> probably is onCreate method, well i am putting the Logcat error messages
>>>>> and Activity code bellow,
>>>>>
>>>>> LogCat:
>>>>>
>>>>> 02-23 18:35:35.935: D/AndroidRuntime(228): Shutting down VM
>>>>> 02-23 18:35:35.946: W/dalvikvm(228): threadid=3: thread exiting with
>>>>> uncaught exception (group=0x4001b188)
>>>>> 02-23 18:35:35.946: E/AndroidRuntime(228): Uncaught handler: thread
>>>>> main exiting due to uncaught exception
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): java.lang.RuntimeException:
>>>>> Unable to start activity
>>>>> ComponentInfo{android.mgo.helloandroid/android.mgo.helloandroid.BTDdetecetwithV7Activity}:
>>>>> java.lang.NullPointerException
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.app.ActivityThread.access$2200(ActivityThread.java:119)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.os.Handler.dispatchMessage(Handler.java:99)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.os.Looper.loop(Looper.java:123)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.app.ActivityThread.main(ActivityThread.java:4363)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> java.lang.reflect.Method.invokeNative(Native Method)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> java.lang.reflect.Method.invoke(Method.java:521)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> dalvik.system.NativeStart.main(Native Method)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): Caused by:
>>>>> java.lang.NullPointerException
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.mgo.helloandroid.BTDdetecetwithV7Activity.onCreate(BTDdetecetwithV7Activity.java:87)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): at
>>>>> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
>>>>> 02-23 18:35:35.985: E/AndroidRuntime(228): ... 11 more
>>>>> 02-23 18:35:36.015: I/dalvikvm(228): threadid=7: reacting to signal 3
>>>>> 02-23 18:35:36.065: I/dalvikvm(228): Wrote stack trace to
>>>>> '/data/anr/traces.txt'
>>>>>
>>>>>
>>>>> *The Activity:*
>>>>>
>>>>> package android.mgo.helloandroid;
>>>>>
>>>>> import java.util.Set;
>>>>>
>>>>> import android.app.Activity;
>>>>> import android.bluetooth.BluetoothAdapter;
>>>>> import android.bluetooth.BluetoothDevice;
>>>>> import android.content.BroadcastReceiver;
>>>>> import android.content.Context;
>>>>> import android.content.Intent;
>>>>> import android.content.IntentFilter;
>>>>> import android.os.Bundle;
>>>>> import android.util.Log;
>>>>> import android.view.View;
>>>>> import android.view.View.OnClickListener;
>>>>> import android.view.Window;
>>>>> import android.widget.ArrayAdapter;
>>>>> import android.widget.Button;
>>>>> import android.widget.ListView;
>>>>>
>>>>> public class BTDdetecetwithV7Activity extends Activity {
>>>>> /** Called when the activity is first created. */
>>>>> // Debugging
>>>>> private static final String TAG = "DeviceListActivity";
>>>>> private static final boolean D = true;
>>>>>
>>>>> // Return Intent extra
>>>>> public static String EXTRA_DEVICE_ADDRESS = "device_address";
>>>>>
>>>>> // Member fields
>>>>> private BluetoothAdapter mBtAdapter;
>>>>> private ArrayAdapter<String> mPairedDevicesArrayAdapter;
>>>>> private ArrayAdapter<String> mNewDevicesArrayAdapter;
>>>>>
>>>>> @Override
>>>>> public void onCreate(Bundle savedInstanceState) {
>>>>> super.onCreate(savedInstanceState);
>>>>>
>>>>> // Setup the window
>>>>> requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
>>>>> setContentView(R.layout.main);
>>>>>
>>>>>
>>>>> // Set result CANCELED in case the user backs out
>>>>> setResult(Activity.RESULT_CANCELED);
>>>>>
>>>>> // Initialize the button to perform device discovery
>>>>> Button scanButton = (Button) findViewById(R.id.button_scan);
>>>>> scanButton.setOnClickListener(new OnClickListener() {
>>>>> public void onClick(View v) {
>>>>> doDiscovery();
>>>>> v.setVisibility(View.GONE);
>>>>> }
>>>>> });
>>>>>
>>>>> // Initialize array adapters. One for already paired devices
>>>>> and
>>>>> // one for newly discovered devices
>>>>> mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this,
>>>>> R.layout.main);
>>>>> mNewDevicesArrayAdapter = new ArrayAdapter<String>(this,
>>>>> R.layout.main);
>>>>>
>>>>> // Find and set up the ListView for paired devices
>>>>> ListView pairedListView = (ListView)
>>>>> findViewById(R.id.paired_devices);
>>>>> pairedListView.setAdapter(mPairedDevicesArrayAdapter);
>>>>>
>>>>> // Find and set up the ListView for newly discovered devices
>>>>> ListView newDevicesListView = (ListView)
>>>>> findViewById(R.id.new_devices);
>>>>> newDevicesListView.setAdapter(mNewDevicesArrayAdapter);
>>>>>
>>>>>
>>>>> // Register for broadcasts when a device is discovered
>>>>> IntentFilter filter = new
>>>>> IntentFilter(BluetoothDevice.ACTION_FOUND);
>>>>> this.registerReceiver(mReceiver, filter);
>>>>>
>>>>>
>>>>> // Register for broadcasts when discovery has finished
>>>>> filter = new
>>>>> IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
>>>>> this.registerReceiver(mReceiver, filter);
>>>>>
>>>>> // Get the local Bluetooth adapter
>>>>> mBtAdapter = BluetoothAdapter.getDefaultAdapter();
>>>>>
>>>>>
>>>>> // Get a set of currently paired devices
>>>>> Set<BluetoothDevice> pairedDevices =
>>>>> mBtAdapter.getBondedDevices();
>>>>>
>>>>>
>>>>> // If there are paired devices, add each one to the
>>>>> ArrayAdapter
>>>>> if (pairedDevices.size() > 0) {
>>>>>
>>>>> findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
>>>>>
>>>>> for (BluetoothDevice device : pairedDevices) {
>>>>> mPairedDevicesArrayAdapter.add(device.getName() + "\n"
>>>>> + device.getAddress());
>>>>> }
>>>>>
>>>>> } else {
>>>>> String noDevices =
>>>>> getResources().getText(R.string.none_paired).toString();
>>>>> mPairedDevicesArrayAdapter.add(noDevices);
>>>>> }
>>>>> }
>>>>>
>>>>> @Override
>>>>> protected void onDestroy() {
>>>>> super.onDestroy();
>>>>>
>>>>>
>>>>> // Make sure we're not doing discovery anymore
>>>>> if (mBtAdapter != null) {
>>>>> mBtAdapter.cancelDiscovery();
>>>>> }
>>>>>
>>>>>
>>>>> // Unregister broadcast listeners
>>>>> this.unregisterReceiver(mReceiver);
>>>>> }
>>>>>
>>>>> /**
>>>>> * Start device discover with the BluetoothAdapter
>>>>> */
>>>>> private void doDiscovery() {
>>>>> if (D) Log.d(TAG, "doDiscovery()");
>>>>>
>>>>>
>>>>> // Indicate scanning in the title
>>>>> setProgressBarIndeterminateVisibility(true);
>>>>> setTitle(R.string.scanning);
>>>>>
>>>>>
>>>>> // Turn on sub-title for new devices
>>>>>
>>>>> findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);
>>>>>
>>>>> // If we're already discovering, stop it
>>>>> if (mBtAdapter.isDiscovering()) {
>>>>> mBtAdapter.cancelDiscovery();
>>>>> }
>>>>>
>>>>>
>>>>>
>>>>> // Request discover from BluetoothAdapter
>>>>> mBtAdapter.startDiscovery();
>>>>>
>>>>> }
>>>>> // The BroadcastReceiver that listens for discovered devices
>>>>> and
>>>>> // changes the title when discovery is finished
>>>>> private final BroadcastReceiver mReceiver = new
>>>>> BroadcastReceiver() {
>>>>> @Override
>>>>> public void onReceive(Context context, Intent intent) {
>>>>> String action = intent.getAction();
>>>>>
>>>>>
>>>>>
>>>>> // When discovery finds a device
>>>>> if (BluetoothDevice.ACTION_FOUND.equals(action)) {
>>>>> // Get the BluetoothDevice object from the Intent
>>>>> BluetoothDevice device =
>>>>> intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
>>>>> // If it's already paired, skip it, because it's been
>>>>> listed already
>>>>> if (device.getBondState() !=
>>>>> BluetoothDevice.BOND_BONDED) {
>>>>> mNewDevicesArrayAdapter.add(device.getName() +
>>>>> "\n" + device.getAddress());
>>>>> }
>>>>>
>>>>> } else if
>>>>> (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
>>>>> setProgressBarIndeterminateVisibility(false);
>>>>> setTitle(R.string.select_device);
>>>>> if (mNewDevicesArrayAdapter.getCount() == 0) {
>>>>> String noDevices =
>>>>> getResources().getText(R.string.none_found).toString();
>>>>> mNewDevicesArrayAdapter.add(noDevices);
>>>>> }
>>>>> }
>>>>> }
>>>>> };
>>>>>
>>>>> }
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Thu, Feb 23, 2012 at 9:27 AM, moktarul anam <[email protected]>wrote:
>>>>>
>>>>>> can u please send me ur activity code and little more log message
>>>>>>
>>>>>> Moktarul anam
>>>>>>
>>>>>> On Feb 23, 10:18 am, moktarul anam <[email protected]> wrote:
>>>>>> > Hi Soyer,
>>>>>> >
>>>>>> > I think problem is in ur oncreate or onstart method. can u please
>>>>>> do
>>>>>> > that ...
>>>>>> > remove all code from oncreate and check
>>>>>> >
>>>>>> > Can u please send little more log
>>>>>> > Moktarul
>>>>>> >
>>>>>> > On Feb 22, 11:42 pm, Mohamed Gougam <[email protected]> wrote:
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> > > Hello moktarul, the thing about manifest.xml, is tht i have only
>>>>>> one
>>>>>> > > activity so nothing to get confused with. the manifest file is
>>>>>> bellow:
>>>>>> >
>>>>>> > > <?xml version="1.0" encoding="utf-8"?>
>>>>>> > > <manifest xmlns:android="
>>>>>> http://schemas.android.com/apk/res/android";
>>>>>> > > package="android.mgo.helloandroid"
>>>>>> > > android:versionCode="1"
>>>>>> > > android:versionName="1.0" >
>>>>>> >
>>>>>> > > <uses-sdk android:minSdkVersion="7" />
>>>>>> >
>>>>>> > > <application
>>>>>> > > android:icon="@drawable/ic_launcher"
>>>>>> > > android:label="@string/app_name" >
>>>>>> > > <activity
>>>>>> > > android:label="@string/app_name"
>>>>>> > > android:name=".BTDdetecetwithV7Activity">
>>>>>> > > <intent-filter>
>>>>>> > > <action
>>>>>> android:name="android.intent.action.MAIN"/>
>>>>>> >
>>>>>> > > <category
>>>>>> android:name="android.intent.category.LAUNCHER"/>
>>>>>> > > </intent-filter>
>>>>>> > > </activity>
>>>>>> > > </application>
>>>>>> > > <uses-permission
>>>>>> android:name="android.permission.BLUETOOTH"/>
>>>>>> > > <uses-permission
>>>>>> > > android:name="android.permission.BLUETOOTH_ADMIN"/>
>>>>>> > > </manifest>
>>>>>> >
>>>>>> > > On Wed, Feb 22, 2012 at 1:04 AM, Mohamed Gougam <
>>>>>> [email protected]> wrote:
>>>>>> > > > Hello moktarul,
>>>>>> >
>>>>>> > > > Thanks alot, i will do that, and let you know :)
>>>>>> >
>>>>>> > > > On Tue, Feb 21, 2012 at 12:10 PM, moktarul anam <
>>>>>> [email protected]>wrote:
>>>>>> >
>>>>>> > > >> sorry, its Activity Intent filter not internt filter
>>>>>> > > >> Moktarul
>>>>>> >
>>>>>> > > >> On Feb 21, 12:42 pm, moktarul anam <[email protected]> wrote:
>>>>>> > > >> > Hi Soyer,
>>>>>> > > >> > All your activity class has to be there in your Manifest.xml
>>>>>> file
>>>>>> >
>>>>>> > > >> > if you call your activity class from other activity then
>>>>>> that class
>>>>>> > > >> > has to be main( internt filter main) Please check these two
>>>>>> point and
>>>>>> > > >> > i think this will solve ur problem.
>>>>>> > > >> > I am sure some problem in ur Manifest.xml file
>>>>>> >
>>>>>> > > >> > Moktarul
>>>>>> >
>>>>>> > > >> > On Feb 20, 11:24 pm, Mohamed Gougam <[email protected]>
>>>>>> wrote:
>>>>>> >
>>>>>> > > >> > > Hi Moktarul, What is in the the manifest file, you mean i
>>>>>> have to
>>>>>> > > >> remove
>>>>>> > > >> > > the "." ? i don't think that's it, the "." has to be there.
>>>>>> >
>>>>>> > > >> > > Thanks guys for the help, Kris is it wrong if somebody try
>>>>>> to learn
>>>>>> > > >> > > something different, out of his field !! Thanks for the
>>>>>> help though i
>>>>>> > > >> > > really appreciate it.
>>>>>> >
>>>>>> > > >> > > On Mon, Feb 20, 2012 at 3:44 PM, moktarul anam <
>>>>>> [email protected]>
>>>>>> > > >> wrote:
>>>>>> > > >> > > > Hi
>>>>>> > > >> > > > BTDdetecetwithV7Activity in ur android Manifest file
>>>>>> > > >> > > > <activity name="BTDdetecetwithV7Activity"/>\
>>>>>> >
>>>>>> > > >> > > > Enjoy
>>>>>> > > >> > > > moktarul
>>>>>> >
>>>>>> > > >> > > > On Feb 20, 12:26 am, Soyer <[email protected]> wrote:
>>>>>> > > >> > > > > Hello everyone, Can anyone explain to me what this
>>>>>> following error
>>>>>> > > >> > > > > means? have anyone faced the same?
>>>>>> >
>>>>>> > > >> > > > > ERROR:
>>>>>> >
>>>>>> > > >> > > > > 02-19 18:10:41.321: E/AndroidRuntime(319):
>>>>>> > > >> java.lang.RuntimeException:
>>>>>> > > >> > > > > Unable to start activity
>>>>>> ComponentInfo{android.mgo.helloandroid/
>>>>>> > > >> > > > > android.mgo.helloandroid.BTDdetecetwithV7Activity}:
>>>>>> > > >> > > > > java.lang.NullPointerException
>>>>>> >
>>>>>> > > >> > > > --
>>>>>> > > >> > > > You received this message because you are subscribed to
>>>>>> the Google
>>>>>> > > >> > > > Groups "Android Developers" group.
>>>>>> > > >> > > > To post to this group, send email to
>>>>>> > > >> [email protected]
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>>>>>> > > >> > > > For more options, visit this group at
>>>>>> > > >> > > >http://groups.google.com/group/android-developers?hl=en
>>>>>> >
>>>>>> > > >> --
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>>>>>
>>>>>
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>>>
>>>
>>>
>>> --
>>> YuviDroid
>>> Check out Launch-X <http://android.yuvalsharon.net/launchx.php> (a
>>> widget to quickly access your favorite apps and contacts!)
>>> http://android.yuvalsharon.net
>>>
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>>
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>
>
>
> --
> YuviDroid
> Check out Launch-X <http://android.yuvalsharon.net/launchx.php> (a widget
> to quickly access your favorite apps and contacts!)
> http://android.yuvalsharon.net
>
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