Just a quick question please, why in my code, i use button but it didn't
ask me to add "implements OnClickListener" and when i try to add, it shows
error...??
On Sun, Feb 26, 2012 at 1:19 AM, Mohamed Gougam <mblack...@gmail.com> 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 <yuvidr...@gmail.com> 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 <mblack...@gmail.com>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 <mblack...@gmail.com>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 <mokta...@gmail.com>wrote:
>>>>
>>>>> can u please send me ur activity code and little more log message
>>>>>
>>>>> Moktarul anam
>>>>>
>>>>> On Feb 23, 10:18 am, moktarul anam <mokta...@gmail.com> 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 <mblack...@gmail.com> 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 <
>>>>> mblack...@gmail.com> wrote:
>>>>> > > > Hello moktarul,
>>>>> >
>>>>> > > > Thanks alot, i will do that, and let you know :)
>>>>> >
>>>>> > > > On Tue, Feb 21, 2012 at 12:10 PM, moktarul anam <
>>>>> mokta...@gmail.com>wrote:
>>>>> >
>>>>> > > >> sorry, its Activity Intent filter not internt filter
>>>>> > > >> Moktarul
>>>>> >
>>>>> > > >> On Feb 21, 12:42 pm, moktarul anam <mokta...@gmail.com> 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 <mblack...@gmail.com>
>>>>> 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 <
>>>>> mokta...@gmail.com>
>>>>> > > >> wrote:
>>>>> > > >> > > > Hi
>>>>> > > >> > > > BTDdetecetwithV7Activity in ur android Manifest file
>>>>> > > >> > > > <activity name="BTDdetecetwithV7Activity"/>\
>>>>> >
>>>>> > > >> > > > Enjoy
>>>>> > > >> > > > moktarul
>>>>> >
>>>>> > > >> > > > On Feb 20, 12:26 am, Soyer <mblack...@gmail.com> 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
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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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