Android 根据日期和时间自动发送短信

1.你好，我再次需要帮助我正在构建一个应用程序，该应用程序将日期、时间、电话号码和消息等数据存储在数据库中，并根据时间和日期自动发送短信，从数据库中检索特定保存日期和时间的数据，我已完成以下代码

 public class MainActivity extends Activity implements OnClickListener {
    // Widget GUI
        Button btnCalendar, btnTimePicker,btnset;
        EditText txtDate, txtTime,txtpno,txtmsg;
        //String pno,msg,date,time;
        // Variable for storing current date and time
        private int mYear, mMonth, mDay, mHour, mMinute;
        private PendingIntent pendingIntent;
        SQLiteDatabase mdatabase=null;
        String pno,msg,date,time;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mdatabase=openOrCreateDatabase("timedb", SQLiteDatabase.CREATE_IF_NECESSARY, null);
        String Time_TABLE="create table if not exists SmsTime (pno TEXT PRIMARY KEY,msg TEXT,date TEXT,time TEXT)";

        mdatabase.execSQL(Time_TABLE);
        mdatabase.close();
        btnCalendar = (Button) findViewById(R.id.btnCalendar);
        btnTimePicker = (Button) findViewById(R.id.btnTimePicker);
        btnset=(Button) findViewById(R.id.btnset);

        txtDate = (EditText) findViewById(R.id.txtDate);
        txtTime = (EditText) findViewById(R.id.txtTime);
        txtpno=(EditText) findViewById(R.id.txtpno);
        txtmsg=(EditText) findViewById(R.id.txtmsg);

        btnCalendar.setOnClickListener(this);
        btnTimePicker.setOnClickListener(this);
        btnset.setOnClickListener(this);
        final Handler h=new Handler();

    mdatabase=openOrCreateDatabase("timedb", SQLiteDatabase.OPEN_READONLY, null);
        final Cursor c=mdatabase.query("SmsTime", null,null, null, null, null, null);

        startManagingCursor(c);
        if(c.getCount()==0){
            Toast.makeText(getApplicationContext(), "NO record found", Toast.LENGTH_LONG).show();
        }
        else{




            c.moveToFirst();
            while(c.isAfterLast()==false){
                pno=c.getString(0);
                msg=c.getString(1);
                date=c.getString(2);
                time=c.getString(3);

                Toast.makeText(getApplicationContext(), "Data"+pno+"  "+msg+"  "+date+"  "+time, Toast.LENGTH_LONG).show();


                SimpleDateFormat dateFormat1 = new SimpleDateFormat("HH:mm"); 

                 Date date1 = null;
                try {
                 date1 = dateFormat1.parse(time);
                } catch (ParseException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                 int date1hh=date1.getHours();
                 int date1mm=date1.getMinutes();
              Toast.makeText(getApplicationContext(), "hh:"+date1hh+"mm:"+date1mm,Toast.LENGTH_LONG).show();

                 SimpleDateFormat dateFormat2 = new SimpleDateFormat("dd-MM-yyyy"); 
                 Date date2 = null;
                try {
                    date2 = dateFormat2.parse(date);
                } catch (ParseException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                 Toast.makeText(getApplicationContext(), "date"+date2, Toast.LENGTH_LONG).show();
                 int date2yy=date2.getYear()+1900;
                 int date2mm=date2.getMonth()+1;
                 int date2dd=date2.getDate();


                 Calendar zCalendarL = Calendar.getInstance(); 
                SimpleDateFormat zDateFormatL = new SimpleDateFormat("yyyy/MM/dd HH:mm");

                String DateTime=date2yy+"/"+date2mm+"/"+date2dd+" "+date1hh+":"+date1mm;
                //String DateTime="2014/01/31 13:00";
            Date d1 = null;
                try {
                    d1 = zDateFormatL.parse(DateTime);
                    //d1 = zDateFormatL.parse(date);
            } catch (ParseException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                long diff =Math.abs(System.currentTimeMillis() - d1.getTime()) ;
                long diffInSec = TimeUnit.MILLISECONDS.toSeconds(diff);
                final int sec=(int)diffInSec;
                Toast.makeText(getApplicationContext(), "diff::"+String.valueOf(sec), Toast.LENGTH_LONG).show();
                //Toast.makeText(getApplicationContext(), "diff::"+String.valueOf(diffInSec), Toast.LENGTH_LONG).show();
                //Toast.makeText(getApplicationContext(), "year:"+date2yy+"month:"+date2mm+"day"+date2dd,Toast.LENGTH_LONG).show();
                new Thread(new Runnable() {

                    @Override
                    public void run() {
                        // TODO Auto-generated method stub

                        try {
                            Thread.sleep(sec*1000);

                        } catch (InterruptedException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }

                        h.post(new Runnable() {

                            @Override
                            public void run() {
                                // TODO Auto-generated method stub
                                SmsManager smsManager = SmsManager.getDefault();
                                  smsManager.sendTextMessage(pno, null, msg, null, null);
                                  Toast.makeText(getApplicationContext(), "Message is sent", Toast.LENGTH_LONG).show();
                            }
                        });

                    }
                }).start();

                            c.moveToNext();
            }
        }

    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if (v == btnCalendar) {

            // Process to get Current Date
            final Calendar c = Calendar.getInstance();
            mYear = c.get(Calendar.YEAR);
            mMonth = c.get(Calendar.MONTH);
            mDay = c.get(Calendar.DAY_OF_MONTH);

            // Launch Date Picker Dialog
            DatePickerDialog dpd = new DatePickerDialog(this,
                    new DatePickerDialog.OnDateSetListener() {

                        @Override
                        public void onDateSet(DatePicker view, int year,
                                int monthOfYear, int dayOfMonth) {
                            // Display Selected date in textbox
                            txtDate.setText(dayOfMonth + "-"
                                    + (monthOfYear + 1) + "-" + year);

                        }
                    }, mYear, mMonth, mDay);
            dpd.show();
        }
        if (v == btnTimePicker) {

            // Process to get Current Time
            final Calendar c = Calendar.getInstance();
            mHour = c.get(Calendar.HOUR_OF_DAY);
            mMinute = c.get(Calendar.MINUTE);

            // Launch Time Picker Dialog
            TimePickerDialog tpd = new TimePickerDialog(this,
                    new TimePickerDialog.OnTimeSetListener() {

                        @Override
                        public void onTimeSet(TimePicker view, int hourOfDay,
                                int minute) {
                            // Display Selected time in textbox
                            txtTime.setText(hourOfDay + ":" + minute);
                        }
                    }, mHour, mMinute, false);
            tpd.show();
        }
        if(v==btnset){


            ContentValues values=new ContentValues();
            values.put("pno", txtpno.getText().toString());
            values.put("msg", txtmsg.getText().toString());
            values.put("date", txtDate.getText().toString());
            values.put("time", txtTime.getText().toString());

            mdatabase=openOrCreateDatabase("timedb", SQLiteDatabase.OPEN_READWRITE, null);
        long newid=mdatabase.insert("SmsTime", null, values);
        //mdatabase.delete("SmsTime", null, null);
            Toast.makeText(getApplicationContext(),"Record inserted Succesfully", Toast.LENGTH_LONG).show();
            txtpno.setText("");
            txtmsg.setText("");
            txtDate.setText("");
            txtTime.setText("");

            mdatabase.close();


        }

    }
    @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;
    }


}

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2.现在的问题是，它一次只发送一条短信，从数据库发送另一条短信。程序应该运行，我应该如何使用这个代码中的服务？请帮助我。

使用意图检查消息是否被发送，然后发送或失败发送下一个消息。也请考虑使用服务来做这种工作是最好的实践。请告诉我如何在这个代码中使用服务？有很多教程可用于在android中创建服务。请参考