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
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>>>> > > >> > > > Groups "Android Developers" group.
>>>> > > >> > > > To post to this group, send email to
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>>>> > > >> > > > To unsubscribe from this group, send email to
>>>> > > >> > > > [email protected]
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>>>> > > >> > > >http://groups.google.com/group/android-developers?hl=en
>>>> >
>>>> > > >> --
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>>>>
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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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