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
> >
> > > >> > > > --
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