How to execute a command?

tv1=(TextView)findViewById(R. id.tv1);
 String str = ((EditText)findViewById(R. id.et1)).getText().toString();

 tv1.setText(str + "\n" );

public class AlarmManagerBroadcastReceiver extends BroadcastReceiver{

 final public static String ONE_TIME="onetime";

@Override
public void onReceive(Context Context, Intent intent){
PowerManager pm=(PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl= pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,"YOUR TAG");


//Perform the lock
wl.acquire();


// As I understand the code needs to be here, but he emphasizes findViewById



//Unlock the stream.*/
wl.release();
}


public void SetAlarm(Context Context)
{
AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent intent=new Intent(context, AlarmManagerBroadcastReceiver.class);
intent.putExtra(ONE_TIME, Boolean.FALSE);//Set the parameter of the intent
PendingIntent pi= PendingIntent.getBroadcast(context,0, intent,0);

 Calendar cal = Calendar.getInstance();
 cal.set(Calendar.HOUR_OF_DAY, 00);
 cal.set(Calendar.MINUTE, 03);
 cal.set(Calendar.SECOND, 10);

 am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pi);
}