Tuesday, May 22, 2012

Get the difference between two Calendar

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

Get the difference between two Calendar


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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