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] >>> > > >> > > > To unsubscribe from this group, send email to >>> > > >> > > > [email protected] >>> > > >> > > > For more options, visit this group at >>> > > >> > > >http://groups.google.com/group/android-developers?hl=en >>> > >>> > > >> -- >>> > > >> 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] >>> > > >> To unsubscribe from this group, send email to >>> > > >> [email protected] >>> > > >> For more options, visit this group at >>> > > >>http://groups.google.com/group/android-developers?hl=en >>> >>> -- >>> 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] >>> To unsubscribe from this group, send email to >>> [email protected] >>> For more options, visit this group at >>> http://groups.google.com/group/android-developers?hl=en >>> >> >> > -- > 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] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- 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 -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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