How do I send a message telling the user the start date is longer than the end date?

Question

I spent all afternoon making this code but I couldn’t get it to work properly. What do I do to send a message to the user saying that the start time cannot be longer than the end time?

xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/content_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.alinesilvagonzaga.myapplication.MainActivity">



<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    android:id="@+id/textView2" />

<EditText
    android:hint="data inicial"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="date"
    android:ems="10"
    android:layout_below="@+id/textView2"
    android:layout_alignParentEnd="true"
    android:layout_marginEnd="246dp"
    android:layout_marginTop="31dp"
    android:id="@+id/editText" />

<EditText
    android:hint="hora inicial"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="time"
    android:ems="10"
    android:layout_alignBottom="@+id/editText"
    android:layout_alignParentEnd="true"
    android:id="@+id/editText2" />

<EditText
    android:hint="data final"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="date"
    android:ems="10"
    android:layout_below="@+id/editText"
    android:layout_alignParentEnd="true"
    android:layout_marginEnd="173dp"
    android:layout_marginTop="60dp"
    android:id="@+id/editText3" />

<EditText
    android:hint="hora final"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="time"
    android:ems="10"
    android:layout_below="@+id/editText3"
    android:layout_alignParentEnd="true"
    android:layout_marginTop="14dp"
    android:id="@+id/editText5" />

    <TextView
        android:text="TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText5"
        android:layout_alignEnd="@+id/textView2"
        android:layout_marginTop="34dp"
        android:id="@+id/textView" />

    <EditText
        android:hint="período"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:ems="10"
        android:layout_below="@+id/textView"
        android:layout_alignParentStart="true"
        android:layout_marginTop="58dp"
        android:id="@+id/editText4" />
</RelativeLayout>

xml Datepicker:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <DatePicker
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/datePicker" />
</LinearLayout>

Timerpicker xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TimePicker
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/timePicker" />
</LinearLayout>

And the logic in Activity:

    private String segundosInicial = "59";
    private String horainicialRegra = "00:00";
    private String horafinalRegra = "23:59";
    private String segundosFinal = "59";
    private String datafinalregra = "18/12/3000"+" "+horafinalRegra+":"+segundosFinal;
    private String oi;
    private String horaatualok;
    private Date atualhoradata;
    private Date atualhoradatafinal;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        editTextDataInicio = (EditText) findViewById(R.id.editText);
        editTextHoraInicio = (EditText) findViewById(R.id.editText2);
        editTextDataTermino = (EditText) findViewById(R.id.editText3);
        editTextHoraTermino = (EditText) findViewById(R.id.editText5);
        TextView textView = (TextView) findViewById(R.id.textView);
        editTextHorario = (EditText) findViewById(R.id.editText4);




        Calendar calendar = Calendar.getInstance();
        Date dataAtual = calendar.getTime();
        datainicialRegra = dataAtual;
        SimpleDateFormat sdffinal = new SimpleDateFormat("dd/MM/yyyy");
        datainicialregra = sdffinal.format(datainicialRegra);
        editTextDataInicio.setText(datainicialregra);

        ano_ = String.valueOf(calendar.get(Calendar.YEAR));
        mes_ = String.valueOf(calendar.get(Calendar.MONTH));
        dia_ = String.valueOf(calendar.get(Calendar.DAY_OF_MONTH));

        dia_ = "0" + dia_;
        mes_ = "0" + (mes_ + 1);

        try{
            dia_ = dia_.substring(1,3);
        }
        catch (Exception e){

        }

        try{
            mes_ = mes_.substring(1,3);
        }
        catch (Exception e){

        }
        datainicialregra = dia_+"/"+mes_+"/"+ano_;

        try {
            datafinalRegra = sdffinal.parse(datafinalregra);
            datainicialRegra = sdffinal.parse(datainicialregra);

        } catch (ParseException e) {

        }




//
        editTextHoraInicio.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final AlertDialog.Builder builderTime = new AlertDialog.Builder(context);
                final View view = ((LayoutInflater) v.getRootView().getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.pegahora, null);
                builderTime.setView(view);
                timePicker = (TimePicker) view.findViewById(R.id.timePicker);

                timePicker.setIs24HourView(true);

                builderTime.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {

                        dialog.dismiss();
                    }
                });
                //coloca aqui
                builderTime.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {

                        datainicialregra = dia_+"/"+mes_+"/"+ano_;
                        Calendar cald = Calendar.getInstance();
                        atualhoradata = cald.getTime();

                        Calendar c = Calendar.getInstance();
                        int hora = timePicker.getHour();
                        int minuto = timePicker.getMinute();

                        String tHora = String.valueOf(hora);
                        String mHora = String.valueOf(minuto);
                        int tamHora = tHora.length();
                        int tamMin = mHora.length();
                        //Aqui é para a data inicial ser maior que a data atual.
                        if (tamHora == 1) {
                            horainicialRegra = "0" + hora + ":" + minuto+":"+segundosInicial;
                           // editTextHoraInicio.setText("0" + hora + ":" + minuto);
                        }
                        if (tamMin == 1) {
                            horainicialRegra = hora + ":" + "0" + minuto+":"+segundosInicial;
                            //editTextHoraInicio.setText(hora + ":" + "0" + minuto);
                        }
                        if (tamHora == 1 && tamMin == 1) {
                            horainicialRegra = "0" + hora + ":" + "0" + minuto+":"+segundosInicial;
                            //editTextHoraInicio.setText("0" + hora + ":" + "0" + minuto);
                        }
                        if (tamHora == 2 && tamMin == 2) {
                            horainicialRegra = hora + ":" + minuto+":"+segundosInicial;
                            //editTextHoraInicio.setText(hora + ":" + minuto);
                        }


                        Log.i(":", horainicialRegra);
                        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
                        try {
                            datainicialRegra = sdf.parse(datainicialregra+" "+horainicialRegra);
                            //datafinalRegra = sdf.parse(datafinalregra+" "+horafinalRegra);

                        } catch (Exception e) {

                        }

                        Log.i("dataatual", sdf.format(atualhoradata));
                        Log.i("datainicial", sdf.format(datainicialRegra));

                            Log.i("jfhdj", String.valueOf(atualhoradata.compareTo(datainicialRegra)));
                        if(atualhoradata.compareTo(datainicialRegra) > 0){

                            AlertDialog.Builder alertaRegra1 = new  AlertDialog.Builder(activity);
                            alertaRegra1.setMessage("Hora já passou!");
                            alertaRegra1.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface arg0, int arg1) {
                                    arg0.dismiss();

                                }
                            });
                            alertaRegra1.create().show();
                        }else {

                            //if (hora >= c.get(Calendar.HOUR_OF_DAY) && minuto >= c.get(Calendar.MINUTE) || (hora == 0) || ( minuto == 0)) {

                            if (tamHora == 1) {
                               // horainicialRegra = "0" + hora + ":" + minuto;
                                editTextHoraInicio.setText("0" + hora + ":" + minuto);
                            }
                            if (tamMin == 1) {
                               // horainicialRegra = hora + ":" + "0" + minuto;
                                editTextHoraInicio.setText(hora + ":" + "0" + minuto);
                            }
                            if (tamHora == 1 && tamMin == 1) {
                                //horainicialRegra = "0" + hora + ":" + "0" + minuto;
                                editTextHoraInicio.setText("0" + hora + ":" + "0" + minuto);
                            }
                            if (tamHora == 2 && tamMin == 2) {
                               // horainicialRegra = hora + ":" + minuto;
                                editTextHoraInicio.setText(hora + ":" + minuto);
                            }

                        }
                        // }else{
                        //      Toast.makeText(context, "O horário não pode ser anterior ao de agora.", Toast.LENGTH_SHORT).show();
                        //  }

                    }
                });
                builderTime.create().show();
            }
        });

        editTextHoraTermino.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final AlertDialog.Builder builderTime2 = new AlertDialog.Builder(context);
                final View view = ((LayoutInflater) v.getRootView().getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.pegahora, null);
                builderTime2.setView(view);
                timePicker = (TimePicker) view.findViewById(R.id.timePicker);

                timePicker.setIs24HourView(true);

                builderTime2.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {

                        dialog.dismiss();
                    }
                });
                //coloca aqui
                builderTime2.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        //Protótipo:
                        //
                        if(editTextDataTermino.getText().toString().trim().equals("")) {
                            AlertDialog.Builder alertaRegra2 = new AlertDialog.Builder(activity);
                            alertaRegra2.setMessage("Insira data final do alerta.");
                            alertaRegra2.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface arg0, int arg1) {
                                    arg0.dismiss();

                                }
                            });
                            alertaRegra2.create().show();
                        }else {

                            Calendar calendarfinal = Calendar.getInstance();
                            atualhoradatafinal = calendarfinal.getTime();

                            Calendar c = Calendar.getInstance();
                            int hora = timePicker.getHour();
                            int minuto = timePicker.getMinute();

                            String tHora = String.valueOf(hora);
                            String mHora = String.valueOf(minuto);
                            int tamHora = tHora.length();
                            int tamMin = mHora.length();

                            if (tamHora == 1) {
                                horafinalRegra = "0" + hora + ":" + minuto + ":" + segundosFinal;
                                // editTextHoraInicio.setText("0" + hora + ":" + minuto);
                            }
                            if (tamMin == 1) {
                                horafinalRegra = hora + ":" + "0" + minuto + ":" + segundosFinal;
                                //editTextHoraInicio.setText(hora + ":" + "0" + minuto);
                            }
                            if (tamHora == 1 && tamMin == 1) {
                                horafinalRegra = "0" + hora + ":" + "0" + minuto + ":" + segundosFinal;
                                //editTextHoraInicio.setText("0" + hora + ":" + "0" + minuto);
                            }
                            if (tamHora == 2 && tamMin == 2) {
                                horafinalRegra = hora + ":" + minuto + ":" + segundosFinal;
                                //editTextHoraInicio.setText(hora + ":" + minuto);
                            }


                            Log.i(":", horainicialRegra);
                            SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
                            try {
                                datafinalRegra = sdf.parse(datafinalregra+" "+horafinalRegra);
                                //datafinalRegra = sdf.parse(datafinalregra+" "+horafinalRegra);

                            } catch (Exception e) {

                            }

                            Log.i("dataatual", sdf.format(atualhoradatafinal));
                            Log.i("datainicial", sdf.format(datafinalRegra));

                            Log.i("jfhdj", String.valueOf(atualhoradatafinal.compareTo(datafinalRegra)));
                            if (atualhoradatafinal.compareTo(datafinalRegra) > 0) {

                                AlertDialog.Builder alertaRegra1 = new AlertDialog.Builder(activity);
                                alertaRegra1.setMessage("Hora já passou!");
                                alertaRegra1.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface arg0, int arg1) {
                                        arg0.dismiss();

                                    }
                                });
                                alertaRegra1.create().show();
                            } else {

                                if (tamHora == 1) {
                                    // horainicialRegra = "0" + hora + ":" + minuto;
                                    editTextHoraTermino.setText("0" + hora + ":" + minuto);
                                }
                                if (tamMin == 1) {
                                    // horainicialRegra = hora + ":" + "0" + minuto;
                                    editTextHoraTermino.setText(hora + ":" + "0" + minuto);
                                }
                                if (tamHora == 1 && tamMin == 1) {
                                    //horainicialRegra = "0" + hora + ":" + "0" + minuto;
                                    editTextHoraTermino.setText("0" + hora + ":" + "0" + minuto);
                                }
                                if (tamHora == 2 && tamMin == 2) {
                                    // horainicialRegra = hora + ":" + minuto;
                                    editTextHoraTermino.setText(hora + ":" + minuto);
                                }

                            }
                        }

Answer 1

In your code in no time are you comparing the hours that the user has placed, but rather comparing each one with the current time. From what you described in the question, this is not what you want to do (and your code is very confusing, it took me a long time to see exactly what was happening, there are several variables that are instantiated but not used (Calendar c for example)

You need to save the values of the hours selected by the user in a variable Member (accessible to the entire class) and do this validation, or at the time the user presses a confirmation button, or using some flag to control whether the two hours have been filled, and then perform the comparison.

Another thing, you are comparing the already formatted Strings in your compareTo, why not compare the Date objects? It makes more sense.

I recommend you take a look at Jodatime, a MUCH library used to manipulate dates/times in Java.

Try to take a look at this reply from the gringo OS, it compares the Date objects.