Volkswagen Polo GTI

S4 / 1.390 cc / 180 PS - Engine of the year / 184 lb/ft (250 Nm) @ 2.000 - 4.500 / twincharger system (kompressor + turbo) / XDS front differential / 0 - 62 mph (100 km/h): 6,9 s / Vmax: 142 mph (229 km/h)

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Maserati Mexico

V8 / 4.136 cc / 264 PS / 268 ft/lb (363 Nm) @ 3.800 / Vmax: 149 mph (240km/h)

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Get the difference between two Calendar

Modify the exercise "android.app.TimePickerDialog", calculate the difference between time and next set time in TimePickerDialog.

package com.exercise.AndroidTime;

import java.util.Calendar;

import android.app.Activity;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;

public class AndroidTimeActivity extends Activity {
 
 TimePicker myTimePicker;
 Button buttonstartSetDialog;
 TextView textPrompt;
 
 TimePickerDialog timePickerDialog;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        textPrompt = (TextView)findViewById(R.id.prompt);
        
        buttonstartSetDialog = (Button)findViewById(R.id.startSetDialog);
        buttonstartSetDialog.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    openTimePickerDialog(false);
    
   }});

    }

  
 private void openTimePickerDialog(boolean is24r){
  Calendar calendar = Calendar.getInstance();
  
  timePickerDialog = new TimePickerDialog(
    AndroidTimeActivity.this, 
    onTimeSetListener, 
    calendar.get(Calendar.HOUR_OF_DAY), 
    calendar.get(Calendar.MINUTE), 
    is24r);
  timePickerDialog.setTitle("TimePickerDialog Title");  
        timePickerDialog.setMessage("TimePickerDialog Message"); 
        
  timePickerDialog.show();

 }
    
    OnTimeSetListener onTimeSetListener
    = new OnTimeSetListener(){

  @Override
  public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

   Calendar calNow = Calendar.getInstance();
   Calendar calSet = (Calendar) calNow.clone();

   calSet.set(Calendar.HOUR_OF_DAY, hourOfDay);
   calSet.set(Calendar.MINUTE, minute);
   
   String stringPrompt = "Current Time is: " + calNow.getTime() + " / " + calNow.getTimeInMillis() + "\n"
     + "Set Time is: " + calSet.getTime() + " / " + calSet.getTimeInMillis() + "\n"
     + "calSet.compareTo(calNow) = " + calSet.compareTo(calNow) + "\n\n";
   
   if(calSet.compareTo(calNow) > 0){
    //Today Set time not yet passed
    long diff = calSet.getTimeInMillis() - calNow.getTimeInMillis();
    stringPrompt += "Millis to set time = " + diff;
   }else{
    //Today Set time passed, count to tomorrow
    calSet.add(Calendar.DATE, 1);
    long diff = calSet.getTimeInMillis() - calNow.getTimeInMillis();
    stringPrompt += "Millis to tomorrow set time = " + diff;
   }
   
   textPrompt.setText(stringPrompt);
  }};

}

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

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <Button
        android:id="@+id/startSetDialog"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:text="Set Target Time"/>
    <TextView
        android:id="@+id/prompt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

Related:
- java.util.Calendar

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java.util.Calendar

java.util.Calendar is an abstract base class for converting between a Date object and a set of integer fields such as YEAR, MONTH, DAY, HOUR, and so on.

Example of usage of Calendar.

package com.exercise.AndroidCalendar;

import java.util.Calendar;
import java.util.Locale;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidCalendarActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        TextView prompt = new TextView(this);
        setContentView(prompt);
        prompt.setText(getCalendarPrompt());
    }
    
    private String getCalendarPrompt(){
     Calendar rightNow = Calendar.getInstance();
     
     String p = rightNow + "\n\n"
       + rightNow.get(Calendar.YEAR) + "-"
       + rightNow.getDisplayName(Calendar.MONTH, Calendar.SHORT, Locale.US) + "-"
       + rightNow.get(Calendar.DATE) + "\n"
       + "DAY_OF_YEAR: " + rightNow.get(Calendar.DAY_OF_YEAR) + "\n"
       + "DAY_OF_MONTH: " + rightNow.get(Calendar.DAY_OF_MONTH) + "\n"
       + "DAY_OF_WEEK: " + rightNow.get(Calendar.DAY_OF_WEEK) + "\n"
       + "\n"
       + "getTime(): " + rightNow.getTime() + "\n"
       + "getTimeInMillis(): " + rightNow.getTimeInMillis() + "\n"
       + "\n";
     
     return p;
    }
}

Related:
- Get the difference between two Calendar

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