Android - Formatting Date and Time.

Date and Time formatting Cheat Sheet

Symbol	Meaning	Type	Type
G	Era	Text	GG->AD
Y	Year	Number	yy -> 03, yyyy -> 2003
M	Month	Text or Number	M -> 7, MM -> 07, MMM -> Jul , MMMM -> July
d	Day in month	Number	d -> 3 , dd -> 03
h	Hour (1-12, AM/PM)	Number	h -> 3 , hh -> 03
H	Hour (0-23)	Number	H -> 15 , HH -> 15
k	Hour (1-24)	Number	k -> 3 , kk -> 03
K	Hour (0-11 AM/PM)	Number	K -> 15 , KK -> 15
m	Minute	Number	m -> 7 , m -> 15 , mm -> 15
s	Second	Number	s -> 15 , ss -> 15
S	Millisecond (0-999)	Number	SSS -> 007
E	Day in week	Text	EEE -> Tue , EEEE -> Tuesday
D	Day in yr(1-365,1-364)	Number	D -> 65 , DDD -> 065
F	Day of week in month (1-5)|	Number	F -> 1
w	Week in year (1-53)	Number	w -> 7
a	AM/PM	Text	a -> AM , aa -> AM
z	Time zone	Text	z -> EST , zzz -> EST , zzzz -> Eastern Standard Time

Some sample of date format

 String DATE_FORMAT_1 = "dd-MMM-yyyy kk:mm";
 String DATE_FORMAT_2 = "yyyy-MM-dd HH:mm:ss";
 String DATE_FORMAT_3 = "yyyy-MM-dd";
 String DATE_FORMAT_4 = "dd-MMM-yyyy"; 
 String DATE_FORMAT_5 = "dd_MM_yyyy"; 
 String DATE_FORMAT_6 = "yyyy-MM-dd'T'HH:mm:ss"; 
 String DATE_FORMAT_7 = "yyyy-MM-dd'T'HH:mm:ss.SSSSSS'Z'"; 

1. Get today date.

Example - 1
 public String getCurrentTimeStr() { 
    return new SimpleDateFormat(DATE_FORMAT_1, Locale.US).format(new Date())
 }

2. Compare dates.

Example - 2
public boolean isFutureDate(String originalDate) {
        boolean isFuture = false; 
         SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_1, Locale.US);           Date dateObj; 
         try { 
               dateObj = sdf.parse(originalDate);
                if (new Date().before(dateObj)) { 
                     isFuture = true;
                } 
          } catch (ParseException e) { 

         }
     return isFuture
 }

3. Convert UTC to Local date UTC is the common time standard across the world.

Example - 3
 public String convertUtcToLocal(String dateTime) { 
       String do = "";
       if(dateTime !=null){ 
           DateFormat originalFormat = new SimpleDateFormat(DATE_FORMAT_2, Locale.US);
            originalFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
            DateFormat targetFormat = new SimpleDateFormat(DATE_FORMAT_2, Locale.US); 
        targetFormat.setTimeZone(TimeZone.getDefault())
         try { 
            Date date = originalFormat.parse(dateTime); 
            dob = targetFormat.format(date);
          } catch (ParseException e) { 
       }
     }
    return do;
 }

4. Merge Date and time

private static final String DATE_TIME = "d MMM yyyy HH:mm";

Example - 4
 public  Date getTrainStartTime(String originalDate, String time) {
        String mAlertDateTime = originalDate + " " + time;
        SimpleDateFormat dft = new SimpleDateFormat(DATE_TIME, Locale.getDefault());
        try {
            Date d = dft.parse(mAlertDateTime);
            return d;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return new Date();
 }

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Android - Load more custom ListView with footer

Overview:- If you are loading data from a web server and the list is huge, then the practical solution would be to load a certain amount and if the user scrolls to the end of the list, load some more and keep going until you load the full list. 

I have handled the following events:


Add a view that will visible on the footer of a list when app loading data from the server.

Notify to your view when load more event occurs.

Notify to your view when scroll end.

CustomListView


import android.content.Context;
import android.support.v4.content.ContextCompat;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ListView;
import android.widget.ProgressBar;
import static android.content.Context.LAYOUT_INFLATER_SERVICE;


public class CustomListView extends ListView implements AbsListView.OnScrollListener {

    private Context mContext;
    //The Load more footer.
    private View loadMoreFooter;
    private boolean isLoadingMore;
    private int currentScrollState;
    private int currentFirstVisibleItem;
    private int currentVisibleItemCount;
    private int currentTotalItemCount;
    private int currentLastItem;

  
    public interface ListViewListener {
        // Load data.        
        void loadData();
        void onScrollEnd();
    }

  private ListViewListener mLoadDataListener;

    /*** Instantiates a new Custom list view.     *    
     * @param context  the context     
     * @param attrs    the attrs     
     * @param defStyle the def style     */  
  public CustomListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        this.setOnScrollListener(this);
        mContext = context;
        initializeLoadMore();
    }

    /*** Instantiates a new Custom list view.     
     * @param context the context     
     * @param attrs   the attrs     */    
   public CustomListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.setOnScrollListener(this);
        mContext = context;
        initializeLoadMore();
    }

    /*** Set load more listener.          
     * @param loadData the load data     */   
    public void setLoadMoreListener(ListViewListener loadData){
        mLoadDataListener =loadData;
    }

    /*** Instantiates a new Custom list view.       
     * @param context the context     */   
    public CustomListView(Context context) {
        super(context);
        this.setOnScrollListener(this);
        initializeLoadMore();
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        this.currentScrollState = scrollState;
        this.isScrollCompleted();
        if (scrollState == OnScrollListener.SCROLL_STATE_IDLE&&mLoadDataListener!=null) {
            mLoadDataListener.onScrollEnd();
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        this.currentFirstVisibleItem = firstVisibleItem;
        this.currentVisibleItemCount = visibleItemCount;
        this.currentTotalItemCount = totalItemCount;
    }
    private void isScrollCompleted() {
        if (this.currentVisibleItemCount > 0 && this.currentScrollState == SCROLL_STATE_IDLE) {
            this.currentLastItem = this.currentFirstVisibleItem + this.currentVisibleItemCount;

            if (currentLastItem == currentTotalItemCount && !(isLoadingMore)&&mLoadDataListener!=null) {
                isLoadingMore = true;
                addFooterView(loadMoreFooter);
                loadMoreFooter.setVisibility(View.VISIBLE);
                mLoadDataListener.loadData();
            }
        }
    }

    /*** Reset load more view.     */   
   public void resetLoadMoreView() {
        isLoadingMore = false;
        loadMoreFooter.setVisibility(View.GONE);
        removeFooterView(loadMoreFooter);
    }
   private void initializeLoadMore() {
      loadMoreFooter = ((LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE)).inflate(R.layout.loading_more_, null, false);

      loadMoreFooter.setBackgroundColor(ContextCompat.getColor(mContext, R.color.white));

      ProgressBar progressBar = (ProgressBar) loadMoreFooter.findViewById(R.id.progressBar);
      progressBar.getIndeterminateDrawable().setColorFilter(ContextCompat.getColor(mContext, R.color.login_bg),
                android.graphics.PorterDuff.Mode.SRC_IN);
    }
}

Adding a FooterView to the ListView  (loading_more_.xml)

A footer View is nothing more than a piece of XML that defines how the footer of your listview will look like. Mine is as follows:

loading_more.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:background="@color/white"
   android:gravity="center_horizontal|center_vertical"
   android:orientation="horizontal"
   android:padding="@dimen/padding_ten">
       <ProgressBar android:id="@+id/progressBar"        
             android:layout_width="@dimen/height_width_20"        
             android:layout_height="@dimen/height_width_20"
        />
</LinearLayout>

At the end ,just implement  ListViewListener in Activity or Fragment and set listener 
listView.setLoadMoreListener(this); , you get lord more and scroll end event of list.

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