Question

I developed a sample clock (Analog) application to display the time. Now my application shows the current time of my mobile. I wish to improve it for showing world times. Unfortunately I don’t have much knowledge in this, can any one guide me?

Answer 1

Here is the code i used to display all cities times.

Main.xml

<?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" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

timezone.xml

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

    <TextView
        android:id="@+id/timezone_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="25dip" />

    <TextView
        android:id="@+id/timezone_time"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="15dip" />

</LinearLayout>

The class files are…

MainActivity.java

package com.practice.secondhand;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class MainActivity extends ListActivity {
    protected static final int UPDATE_UI = 0;

    TimeZoneAdaptor timezoneAdaptor = null;
    List<TimeZoneData> timezonelist = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        timezonelist = new ArrayList<TimeZoneData>();
        timezoneAdaptor = new TimeZoneAdaptor(this, R.layout.timezoneview,
                timezonelist);

        setListAdapter(timezoneAdaptor);
    }

    @Override
    protected void onStart() {
        super.onStart();

        String[] listItems = TimeZone.getAvailableIDs();

        TimeZone timezone = null;
        SimpleDateFormat format = new SimpleDateFormat(
                "EEE, MMM d, yyyy h:mm a");
        Date now = new Date();

        for (int index = 0; index < listItems.length; ++index) {
            timezone = TimeZone.getTimeZone(listItems[index]);

            format.setTimeZone(timezone);

            timezonelist.add(new TimeZoneData(getDiaplayName(listItems[index]),
                    format.format(now)));

            timezone = null;
        }
    }

    private String getDiaplayName(String timezonename) {
        String displayname = timezonename;
        int sep = timezonename.indexOf('/');

        if (-1 != sep) {
            displayname = timezonename.substring(0, sep) + ", "
                    + timezonename.substring(sep + 1);
            displayname = displayname.replace("_", " ");
        }

        return displayname;
    }

    public class TimeZoneAdaptor extends ArrayAdapter<TimeZoneData> {

        List<TimeZoneData> objects = null;

        public TimeZoneAdaptor(Context context, int textViewResourceId,
                List<TimeZoneData> objects) {
            super(context, textViewResourceId, objects);

            this.objects = objects;
        }

        @Override
        public int getCount() {
            return ((null != objects) ? objects.size() : 0);
        }

        @Override
        public TimeZoneData getItem(int position) {
            return ((null != objects) ? objects.get(position) : null);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = convertView;

            if (null == view) {
                LayoutInflater vi = (LayoutInflater) MainActivity.this
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                view = vi.inflate(R.layout.timezoneview, null);
            }

            TimeZoneData data = objects.get(position);

            if (null != data) {
                TextView textName = (TextView) view
                        .findViewById(R.id.timezone_name);
                TextView textTime = (TextView) view
                        .findViewById(R.id.timezone_time);

                textName.setText(data.name);
                textTime.setText(data.time);
            }

            return view;
        }
    }
}

TimeZoneData.java

package com.practice.secondhand;


public class TimeZoneData {
        public String name;
        public String time;

        public TimeZoneData(String name,String time) {
                this.name = name;
                this.time = time;
        }
}

TimeZoneAdaptor .java

public class TimeZoneAdaptor extends ArrayAdapter<TimeZoneData> {

    List<TimeZoneData> objects = null;

    public TimeZoneAdaptor(Context context, int textViewResourceId,
            List<TimeZoneData> objects) {
        super(context, textViewResourceId, objects);

        this.objects = objects;
    }

    public int getCount() {
        return ((null != objects) ? objects.size() : 0);
    }

    public TimeZoneData getItem(int position) {
        return ((null != objects) ? objects.get(position) : null);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;

        if (null == view) {
            LayoutInflater vi = (LayoutInflater) TimeZonesList.this
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = vi.inflate(R.layout.timezoneview, null);
        }

        TimeZoneData data = objects.get(position);

        if (null != data) {
            TextView textName = (TextView) view
                    .findViewById(R.id.timezone_name);
            TextView textTime = (TextView) view
                    .findViewById(R.id.timezone_time);
            textName.setTextSize(18);
            textName.setTextColor(Color.GREEN);
            textName.setText(data.name);
            textTime.setText(data.time);
            textTime.setTextSize(15);

        }

        return view;

    }

}