public class MainActivity extends AppCompatActivity {

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

public void onClick (View v){
        ToggleButton tb = (ToggleButton)v;
if(tb.isChecked() == false){
            Intent intent = new Intent( this, WeatherService.class);
            stopService(intent);
        }
else{
            Intent intent = new Intent (this, WeatherService.class);
            startService(intent);
        }
    }

public class WeatherService extends Service {
private Thread thread;
private Handler handler;

public void onCreate() {
super.onCreate();
handler = new WeatherForecastHandler(this);
thread = new WeatherThread(handler);
    }

public int onStartCommand(Intent intent, int flags, int startId) {
if (thread.isAlive() == false) {
thread.start();
        }
return super.onStartCommand(intent, flags, startId);
    }
public void onDestroy() {
super.onDestroy();
thread.interrupt();
    }

@Override
    public IBinder onBind(Intent intent) {
return null;
    }
}

public class WeatherThread extends Thread{
private Handler handler;
public WeatherThread(Handler h) { handler =h;}

public void run() {
try {
while (true) {
                URL url = new URL(
"http://www.kma.go.kr/XML/weather/sfc_web_map.xml");

                XmlPullParserFactory parserFactory = XmlPullParserFactory.newInstance();
                XmlPullParser parser = parserFactory.newPullParser();
                parser.setInput(url.openStream(), "utf-8");
int parserEvent = parser.getEventType();
                String desc = "";
                String ta = "";
                String region = "";
                String name = "";
while (parserEvent != XmlPullParser.END_DOCUMENT) {
switch (parserEvent) {
case XmlPullParser.START_DOCUMENT:
break;
case XmlPullParser.START_TAG:
                            name = parser.getName();
if (name != null && name.equals("local")) {
                                desc = parser.getAttributeValue(null, "desc");
                                ta = parser.getAttributeValue(null, "ta");
                            }
break;
case XmlPullParser.TEXT:
if (name != null && name.equals("local")) {
                                region = parser.getText();
                            }
break;
case XmlPullParser.END_TAG:
if (name != null && name.equals("local")) {
                                Message msg = handler.obtainMessage();
                                WeatherForecast wf = new WeatherForecast();
                                wf.desc = desc;
                                wf.region = region;
                                wf.ta = ta;
                                msg.obj = wf;
handler.sendMessage(msg);
                            }
                            name = "";
break;
                    }
                    Thread.sleep(1000);
                    parserEvent = parser.next();
                }
            }
        } catch (InterruptedException e) {
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

public class WeatherForecastHandler extends Handler{
private Context context;
public WeatherForecastHandler (Context ctx){
context = ctx;
    }
public void handleMessage(Message msg){
super.handleMessage(msg);
        WeatherForecast wf = (WeatherForecast)msg.obj;

        Intent intent = new Intent();
        intent.putExtra("region", wf.region);
        intent.putExtra("desc", wf.desc);
        intent.putExtra("ta", wf.ta);
        intent.setAction("android.intent.action.WEATHER_FORECAST_RECEIVED");
context.sendBroadcast(intent);
    }
}

public class WeatherAppWidgetProvider extends AppWidgetProvider{
public void onReceive (Context context, Intent intent){
        String region = intent.getStringExtra("region");
        String desc = intent.getStringExtra("desc");
        String ta = intent.getStringExtra("ta");

if(region == null) region = "unknown";

        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
        RemoteViews remote = new RemoteViews(context.getPackageName(),R.layout.weatherview);
        remote.setTextViewText(R.id.textView1, region);
        remote.setTextViewText(R.id.textView2, desc);
        remote.setTextViewText(R.id.textView3, ta);

        appWidgetManager.updateAppWidget(
new ComponentName("com.example.weatherappwidgettest",
"com.example.weatherappwidgettest.WeatherAppWidgetProvider"),
                remote);
super.onReceive(context, intent);
    }
}

--------------------------------------------------------------------------------------------------

public class WeatherForecast {
public String region;
public String desc;
public String ta;
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.lkb.weatherappwidgettest" >
<uses-permission android:name="android.permission.INTERNET"/>

    <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
        <receiver android:name = "WeatherAppWidgetProvider">
            <intent-filter>
                <action android:name=
                    "android.appwidget.action.APPWIDGET_UPDATE"/>
                <action android:name=
                    "android.intent.action.WEATHER_FORECAST_RECEIVED"/>
            </intent-filter>
            <meta-data android:name="android.appwidget.provider"
                android:resource="@xml/weathermeta"/>
        </receiver>
    </PreferenceScreen>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>