安卓学习notification

写一个基类activity让其他的继承可以显示的知道哪个活动
public class BaseActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        Log.d("BaseActivity", getClass().getSimpleName());
    }
}

public class MainActivity extends BaseActivity implements OnClickListener{
    private Button sendbtn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sendbtn=(Button)findViewById(R.id.send_notice);
        sendbtn.setOnClickListener(this);
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.send_notice:
            NotificationManager manger=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
            Notification notification=new Notification(R.drawable.ic_launcher,"this is ticker text",System.currentTimeMillis());
            Intent intent=new Intent(this,SecondActivity.class);
            PendingIntent pi=PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
            notification.setLatestEventInfo(this, "this is content title", "this is content text", pi);
            manger.notify(1, notification);
            break;

        default:
            break;
        }
        
    }
}

public class SecondActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        NotificationManager manager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        manager.cancel(1);
    }
}