Service et Activite

Salut a tous. j'essaie de faire démarrer une activité par un service mais a l’exécution de l'application j'ai l'erreur ci-dessous dans le LogCat :

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07-31 11:01:23.318: E/AndroidRuntime(1904): FATAL EXCEPTION: main
07-31 11:01:23.318: E/AndroidRuntime(1904): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.malambi.beamme/com.malambi.beamme.DialogAlert}: java.lang.InstantiationException: com.malambi.beamme.DialogAlert
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.app.ActivityThread.access$2300(ActivityThread.java:125)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.os.Handler.dispatchMessage(Handler.java:99)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.os.Looper.loop(Looper.java:123)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.app.ActivityThread.main(ActivityThread.java:4627)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at java.lang.reflect.Method.invokeNative(Native Method)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at java.lang.reflect.Method.invoke(Method.java:521)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:885)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at dalvik.system.NativeStart.main(Native Method)
07-31 11:01:23.318: E/AndroidRuntime(1904): Caused by: java.lang.InstantiationException: com.malambi.beamme.DialogAlert
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at java.lang.Class.newInstanceImpl(Native Method)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at java.lang.Class.newInstance(Class.java:1429)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
07-31 11:01:23.318: E/AndroidRuntime(1904): 	... 11 more

voici mon Activité

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import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
 
public class DialogAlert extends Activity {
 
 
	Context context ;
 
	public DialogAlert (Context context){
		this.context = context ;
	}
 
 
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.alert);
		showDialog() ;
	}
 
 
	/*@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.dialog_alert, menu);
		return true;
	}*/
 
 
	public void showDialog() {
 
		Button btnAlert = (Button) findViewById(R.id.button1);
 
		btnAlert.setOnClickListener(new View.OnClickListener() {
 
			public void onClick(View arg0) {
				// Creating alert Dialog with one Button
 
				AlertDialog alertDialog = new AlertDialog.Builder(DialogAlert.this).create();
 
				// Setting Dialog Title
				alertDialog.setTitle("Alert Dialog");
 
				// Setting Dialog Message
				alertDialog.setMessage("Welcome to AndroidHive.info");
 
				// Setting Icon to Dialog
				alertDialog.setIcon(R.drawable.tick);
 
				// Setting OK Button
				alertDialog.setButton("OK",
						new DialogInterface.OnClickListener() {
 
							public void onClick(DialogInterface dialog,
									int which) {
								// Write your code here to execute after dialog
								// closed
								Toast.makeText(getApplicationContext(),
										"You clicked on OK", Toast.LENGTH_SHORT)
										.show();
							}
						});
 
				// Showing Alert Message
				alertDialog.show();
 
			}
		});
	}
 
	public void doPositiveClick() {
		// Do stuff here.
		Toast.makeText(context, "Click sur Ok", Toast.LENGTH_SHORT).show();	
		Log.i("FragmentAlertDialog", "Positive click!");
	}
 
	public void doNegativeClick() {
		// Do stuff here.
		Toast.makeText(context, "click sur Annuler", Toast.LENGTH_SHORT).show();
 
		Log.i("FragmentAlertDialog", "Negative click!");
 
 
 
 
	}
}

j'effectue le démarrage de cette manière

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public void StartActivity(){
		Intent dialogIntent = new Intent(getBaseContext(), DialogAlert.class);
		dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
		getApplication().startActivity(dialogIntent);
	}
@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		Toast.makeText(this, "Demarrage du service", Toast.LENGTH_SHORT).show();
 
	      try {
 
	    	  StartActivity() ;
			 //bip.playSound(getApplicationContext()) ;
	    	// tone.startTone(8,8000);
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalStateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
 
		//timer.schedule(receivehelper.stock, 1000 , 1000) ;
 
		return super.onStartCommand(intent, flags, startId);
	}