Question

我有一项任务，应用程序使用LocationManager和GPS_PROVIDER来监听位置Latitude和Longitude并将其存储在临时内存中一段时间。当临时存储器达到六LatLngs时，它会通过SMS将其内容发送到手机号码，内容必须变为null。我使用了以下代码

 private void sendLog() {
    Toast.makeText(MainPage.this,"Sending Log",Toast.LENGTH_LONG).show();
    final SharedPreferences account=getSharedPreferences("admins",MODE_PRIVATE);
    String interval=account.getString("lti", "");
    int timeInterval=Integer.parseInt(interval);

    LocationManager logManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
    logManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30000, 100, new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {

            double latitude=location.getLatitude();
            double longitude=location.getLongitude();
            DecimalFormat dFormat = new DecimalFormat("#.####");
            Date date=new Date();
            SimpleDateFormat sdf=new SimpleDateFormat("kk:mm");
            String time=sdf.format(date);

                List<String> loglist = new ArrayList<String>();
            for (int i=1;i<=6;i++){
                loglist.add("!+" + dFormat.format(latitude) + ",+" + dFormat.format(longitude) + "," + time);
            }
            Toast.makeText(MainPage.this,loglist.toString(),Toast.LENGTH_LONG).show();
            if (loglist.size()==6){
                StringBuilder log = new StringBuilder();
                for (int j=0;j<loglist.size();j++){
                    log.append(loglist.get(j).toString());
                }

               SmsManager smsManager=SmsManager.getDefault();
                smsManager.sendTextMessage(logPreferences.getString("admin1",""),null,log.toString(),null,null);
            }
        }

此代码获取LatLng并发送带有六个值的sms而不会失败。但问题是它在阵列列表的所有位置只添加一个纬度和经度值。我不想在各个方面获得相同的价值。我想在ArrayList中有六个不同的纬度和经度值。如果有人知道怎么做，请帮助我。谢谢。

Answer 1

        List<String> loglist = new ArrayList<String>();
        for (int i=1;i<=6;i++){
        if(!loglist.contains(dFormat.format(latitude)+","+dFormat.format(longitude)+","+time))  //if not already added then add it
        loglist.add(dFormat.format(latitude)+","+dFormat.format(longitude)+","+time);
        }

检查是否尚未添加该值，如果没有，则添加

Answer 2

因为您循环了相同的位置6次，请尝试以下代码：

            List<String> loglist = new ArrayList<String>(); // declare your list outside the listener, or make it as class variable.   
            LocationManager logManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
                logManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30000, 100, new LocationListener() {
                    @Override
                    public void onLocationChanged(Location location) {

                        double latitude=location.getLatitude();
                        double longitude=location.getLongitude();
                        DecimalFormat dFormat = new DecimalFormat("#.####");
                        Date date=new Date();
                        SimpleDateFormat sdf=new SimpleDateFormat("kk:mm");
                        String time=sdf.format(date);

                        Toast.makeText(MainPage.this,loglist.toString(),Toast.LENGTH_LONG).show();
                        if (loglist.size()==6){// you reach 6 values => send the SMS
                            StringBuilder log = new StringBuilder();
                            for (int j=0;j<loglist.size();j++){
                                log.append(loglist.get(j).toString());
                            }

                           SmsManager smsManager=SmsManager.getDefault();
                            smsManager.sendTextMessage(logPreferences.getString("admin1",""),null,log.toString(),null,null);
                        } else {// you can add more location
                           loglist.add("!+" + dFormat.format(latitude) + ",+" + dFormat.format(longitude) + "," + time);
                        }
                    }

如何在Android中向ArrayList添加纬度和经度？

2 个答案: