Building Weather App using MVVM design pattern (Kotlin)

-
https://github.com/eduxcellence/WeatherApp_Kotlin
MainActivity.kt
Contains View show User Current Weather Report and next day Weather Report.

class MainActivity:AppCompatActivity() {
    val TAG: String? = MainActivity::class.java.simpleName
    var access_key: String = BuildConfig.access_key /*"fc7ca27cdb74949f62f5b936e50db2c3"*/
    var query: String = "Lucknow,Uttar Pradesh,IN"
    var isUp = false
    //  Check Internet Continuosly
    var TYPE_WIFI = 1
    var TYPE_MOBILE = 2
    var TYPE_NOT_CONNECTED = 0
    var snackbar: Snackbar? = null
    val coordinatorLayout: CoordinatorLayout? = null
    var internetConnected = true
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        //create a current date string.
        val date_n = SimpleDateFormat("MMM dd, yyyy", Locale.getDefault()).format(Date())
        //set current date.
        tv_current_date.text = date_n
        //set current location.
        var currentCity = query.split(",")
        tv_current_location.text = currentCity[0]
if(checkConnectivity(applicationContext))
{
    //Fetch Current Weather and Next Day Forecasting repository data
    getWeatherReport()
}else
{
    val builder = AlertDialog.Builder(this@MainActivity)
    //set title for alert dialog
    builder.setTitle("Network Issues / Internet Connection Lost")
    //set message for alert dialog
    builder.setMessage("Turn on Network Data")
    builder.setIcon(R.drawable.ic_no_internet)
    //performing positive action
    builder.setPositiveButton("Retry") { dialogInterface, which ->
        if(checkConnectivity(applicationContext))
        {
            //Fetch Current Weather and Next Day Forecasting repository data
            getWeatherReport()
        }
    }
    //performing negative action
    builder.setNegativeButton("Exit") { dialogInterface, which ->
        finish()
    }
    // Create the AlertDialog and set Properties
    val alertDialog: AlertDialog = builder.create()
    alertDialog.setCancelable(false)
    alertDialog.show()
}
        //declaring swipe refresh listener
        swipeRefresh.setOnRefreshListener {
            if(checkConnectivity(applicationContext))
            {
                //Fetch Current Weather and Next Day Forecasting repository data
                getWeatherReport()
            }else
            {
                val builder = AlertDialog.Builder(this@MainActivity)
                //set title for alert dialog
                builder.setTitle("Network Issues / Internet Connection Lost")
                //set message for alert dialog
                builder.setMessage("Turn on Network Data")
                builder.setIcon(R.drawable.ic_no_internet)
                //performing positive action
                builder.setPositiveButton("Retry") { dialogInterface, which ->
                    if(checkConnectivity(applicationContext))
                    {
                        //Fetch Current Weather and Next Day Forecasting repository data
                        getWeatherReport()
                    }
                }
                //performing negative action
                builder.setNegativeButton("Exit") { dialogInterface, which ->
                    finish()
                }
                // Create the AlertDialog and set Properties
                val alertDialog: AlertDialog = builder.create()
                alertDialog.setCancelable(false)
                alertDialog.show()
            }
        }
    }
    private fun getWeatherReport() {
        val weatherRepository = ViewModelProvider(this).get(WeatherRepository::class.java)
        GetCurrentWeather(weatherRepository)
        NextDayWeather(weatherRepository)
    }
    fun GetCurrentWeather(weatherRepository: WeatherRepository) {
        swipeRefresh.isRefreshing = true
        weatherRepository.getCurrentWeatherReport(access_key, query).observe(this, object : Observer<WeatherReport> {
            override fun onChanged(weatherReport: WeatherReport?) {
                if (weatherReport == null) {
                    swipeRefresh.isRefreshing = false
                    val builder = AlertDialog.Builder(this@MainActivity)
                    //set title for alert dialog
                    builder.setTitle(R.string.dialogTitle)
                    //set message for alert dialog
                    builder.setMessage(R.string.dialogMessage)
                    builder.setIcon(R.drawable.ic_error)
                    //performing positive action
                    builder.setPositiveButton("Retry") { dialogInterface, which ->
                        GetCurrentWeather(weatherRepository)
                    }
                    //performing negative action
                    builder.setNegativeButton("Exit") { dialogInterface, which ->
                        finish()
                    }
                    // Create the AlertDialog and set Properties
                    val alertDialog: AlertDialog = builder.create()
                    alertDialog.setCancelable(false)
                    alertDialog.show()
                } else {
                    val currentTempKelvin = weatherReport?.main?.temp
                    val currentTempCelsius = currentTempKelvin?.minus(273.15)
                    //set current temperature.
                    tv_current_temperature.text = currentTempCelsius?.toInt().toString()
                    //   tvStatus.setText(weatherReport.getWeather().get(0).getDescription())
                    tvHumidity.text = "" + weatherReport?.main?.humidity + " %"
                    tvSensible.text =
                        "" + (weatherReport?.main?.feels_like?.minus(273.15))?.toInt().toString() + Html.fromHtml(" \u2103")
                    tvPressure.text = "" + weatherReport?.main?.pressure + " hPa"
                    tvWind.text = "" + weatherReport?.wind?.speed + " km/h"
                    if (weatherReport != null) {
                        //set current weather description.
                        tv_current_description.text = weatherReport.weather?.get(0)?.description
                        //set current weather description image.
                        Picasso.get()
                            .load("http://openweathermap.org/img/wn/" + weatherReport.weather?.get(0)?.icon + "@2x.png")
                            .into(iv_current_description)
                        tv_today_temp_minmax.text =
                            weatherReport?.main?.tempMax?.minus(273.15)?.toInt().toString() + " / " + weatherReport?.main?.tempMin?.minus(
                                273.15
                            )?.toInt().toString()
                        val formatter = SimpleDateFormat("HH:mm:ss a ", Locale.US)
                        formatter.timeZone = TimeZone.getDefault()/* TimeZone.getTimeZone("UTC")*/
                        /* val text = formatter.format(Date((weatherReport.sys?.sunset)!!*1000))
                         println(text)*/
                        tv_sunrise.text = formatter.format(Date((weatherReport.sys?.sunrise)!! * 1000))
                        tv_sunset.text = formatter.format(Date((weatherReport.sys?.sunset)!! * 1000))
                        swipeRefresh.isRefreshing = false
                    }
                }
            }
        })
    }
    fun NextDayWeather(weatherRepository: WeatherRepository) {
        swipeRefresh.isRefreshing = true
        weatherRepository.getForecastWeatherReport(access_key, query)
            .observe(this, object : Observer<WeatherNextDaysReport> {
                override fun onChanged(weatherReport: WeatherNextDaysReport?) {
                    if (weatherReport == null) {
                        swipeRefresh.isRefreshing = false
                        val builder = AlertDialog.Builder(this@MainActivity)
                        //set title for alert dialog
                        builder.setTitle(R.string.dialogTitle)
                        //set message for alert dialog
                        builder.setMessage(R.string.dialogMessage)
                        builder.setIcon(R.drawable.ic_error)
                        //performing positive action
                        builder.setPositiveButton("Retry") { dialogInterface, which ->
                            NextDayWeather(weatherRepository)
                        }
                        //performing negative action
                        builder.setNegativeButton("Exit") { dialogInterface, which ->
                            finish()
                        }
                        // Create the AlertDialog and set Properties
                        val alertDialog: AlertDialog = builder.create()
                        alertDialog.setCancelable(false)
                        alertDialog.show()
                    } else {
                        val stringListDataHashMap = HashMap<String, ListData>()
                        if (weatherReport.list.isEmpty()) {
                            swipeRefresh.isRefreshing = false
                        } else {
                            //
                            for (y in 0 until weatherReport.list.size) {
                                stringListDataHashMap[weatherReport.list.get(y).getDtTxt()!!] =
                                    weatherReport.list.get(y)
                                //  System.out.println("Value = " + weatherReport.getList().get(y).getDtTxt());
                            }
                            val listData = ArrayList<ListData>()
                            for (value in stringListDataHashMap.values) {
                                System.out.println("Ascending before Value = " + value.getDtTxt())
                                listData.add(value)
                            }
                            // Sort date in assending order
                            Collections.sort(listData, object : Comparator<ListData> {
                                @SuppressLint("SimpleDateFormat")
                                var f: DateFormat = SimpleDateFormat("yyyy-MM-dd")
                                override fun compare(lhs: ListData, rhs: ListData): Int {
                                    try {
                                        return f.parse(lhs.getDtTxt()).compareTo(f.parse(rhs.getDtTxt()))
                                    } catch (e: ParseException) {
                                        e.printStackTrace()
                                        throw IllegalArgumentException(e)
                                    }
                                }
                            })
                            for (i in listData.indices) {
                                System.out.println("Ascending after Value = " + listData[i].getDtTxt())
                            }
                            rvNextDays.adapter = WeatherNextAdapter(applicationContext, listData)
                            rvNextDays.layoutManager = LinearLayoutManager(this@MainActivity)
                            swipeRefresh.isRefreshing = false
                        }
                    }
                }
            })
    }
    class WeatherNextAdapter(var context: Context, var listDataList: List<ListData>) :
        RecyclerView.Adapter<WeatherNextAdapter.WeatherView>() {
        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = WeatherView(
            LayoutInflater.from(parent.context).inflate(R.layout.item_next_forecast, parent, false)
        )
        override fun onBindViewHolder(holder: WeatherView, position: Int) {
            val listData = listDataList[position]
            if (position != 0) {
                Picasso.get()
                    .load("http://openweathermap.org/img/wn/" + listData.weather.get(0).icon + "@2x.png")
                    .into(holder.ivWeatherStatus)
                if (position == 1) {
                    holder.tvDate.text = context.getString(R.string.tomorrow)
                } else {
                    holder.tvDate.setText(DateConvert(listData.getDtTxt()!!))
                }
                holder.tvDescription.text = listData.weather[0].description
                holder.tvDayName.setText(DayConvert(listData.getDtTxt()!!))
                holder.tvTemp.text =
                    String.format(
                        "%d%s",
                        (listData.main?.temp?.minus(273.15))?.toInt(),
                        Html.fromHtml(" \u2103")
                    )
            } else {
                holder.itemView.visibility = View.GONE
            }
        }
        override fun getItemCount(): Int {
            return listDataList.size
        }
        class WeatherView(itemView: View) : RecyclerView.ViewHolder(itemView) {
            val tvDate: TextView
            val tvDayName: TextView
            val tvTemp: TextView
            val tvDescription: TextView
            val ivWeatherStatus: ImageView
            init {
                println("hittingh")
                tvDate = itemView.findViewById(R.id.tvDate)
                tvDayName = itemView.findViewById(R.id.tvDayName)
                ivWeatherStatus = itemView.findViewById(R.id.ivWeatherStatus)
                tvTemp = itemView.findViewById(R.id.tvTemp)
                tvDescription = itemView.findViewById(R.id.tvDescription)
            }
        }
        //convert date format in dd-MM
        @SuppressLint("SimpleDateFormat")
        fun DateConvert(date: String): String {
            var dateString = date
            try {
                val sdf2 = SimpleDateFormat("dd-MM")
                val sdf = SimpleDateFormat("yyyy-MM-dd")
                dateString = sdf2.format(sdf.parse(dateString))
            } catch (e: ParseException) {
                e.printStackTrace()
            }
            return dateString
        }
        //convert date format in day name
        @SuppressLint("SimpleDateFormat")
        fun DayConvert(dateString: String): String? {
            val sdf = SimpleDateFormat("yyyy-MM-dd")
            val sdf_ = SimpleDateFormat("EEEE")
            var dayName: String? = null
            try {
                dayName = sdf_.format(sdf.parse(dateString))
            } catch (e: ParseException) {
                e.printStackTrace()
            }
            return dayName
        }
    }
    // slide the view from below itself to the current position
    fun slideUp(view: View) {
        view.visibility = View.VISIBLE
        val animate = TranslateAnimation(
            0f, // fromXDelta
            0f, // toXDelta
            view.height.toFloat(), // fromYDelta
            0f
        )                // toYDelta
        animate.duration = 500
        animate.fillAfter = true
        view.startAnimation(animate)
    }
    // slide the view from its current position to below itself
    fun slideDown(view: View) {
        val animate = TranslateAnimation(
            0f, // fromXDelta
            0f, // toXDelta
            0f, // fromYDelta
            view.height.toFloat()
        ) // toYDelta
        animate.duration = 500
        animate.fillAfter = true
        view.startAnimation(animate)
        Handler().postDelayed({
            view.visibility = View.GONE
        }, 501)
    }
    fun onSlideViewButtonClick(view: View) {
        if (isUp) {
            slideDown(lay_nextdays)
            iv_bottom_slide_up.setImageResource(R.drawable.ic_slideup)
        } else {
            slideUp(lay_nextdays)
            iv_bottom_slide_up.setImageResource(R.drawable.ic_slidedown)
        }
        isUp = !isUp
    }
    /**
     * Method to register runtime broadcast receiver to show snackbar alert for internet connection..
     */
    private fun registerInternetCheckReceiver() {
        val internetFilter = IntentFilter()
        internetFilter.addAction("android.net.wifi.STATE_CHANGE")
        internetFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE")
        registerReceiver(broadcastReceiver, internetFilter)
    }
    /**
     * Runtime Broadcast receiver inner class to capture internet connectivity events
     */
    var broadcastReceiver: BroadcastReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context, intent: Intent) {
            val status = getConnectivityStatusString(context)
            setSnackbarMessage(status, false)
        }
    }
    fun getConnectivityStatus(context: Context): Int {
        val cm = context
            .getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val activeNetwork = cm.activeNetworkInfo
        if (null != activeNetwork) {
            if (activeNetwork.type == ConnectivityManager.TYPE_WIFI)
                return TYPE_WIFI
            if (activeNetwork.type == ConnectivityManager.TYPE_MOBILE)
                return TYPE_MOBILE
        }
        return TYPE_NOT_CONNECTED
    }
    fun getConnectivityStatusString(context: Context): String? {
        val conn = getConnectivityStatus(context)
        var status: String? = null
        if (conn == TYPE_WIFI) {
            status = "Wifi enabled"
        } else if (conn == TYPE_MOBILE) {
            status = "Mobile data enabled"
        } else if (conn == TYPE_NOT_CONNECTED) {
            status = "Not connected to Internet"
        }
        return status
    }
    private fun setSnackbarMessage(status: String?, showBar: Boolean) {
        var internetStatus = ""
        try {
            if (status!!.equals("Wifi enabled", ignoreCase = true) || status.equals(
                    "Mobile data enabled",
                    ignoreCase = true
                )
            ) {
                internetStatus = "Internet Connected"
                window.clearFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE)
                snackbar =
                    Snackbar.make(findViewById(android.R.id.content), internetStatus, Snackbar.LENGTH_LONG)
            } else {
                window.setFlags(
                    WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
                    WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                )
                internetStatus = "Lost Internet Connection"
                snackbar = Snackbar.make(
                    findViewById(android.R.id.content),
                    internetStatus,
                    Snackbar.LENGTH_INDEFINITE
                )
            }
            val sbView = snackbar!!.getView()
            val textView = sbView.findViewById(R.id.snackbar_text) as TextView
            textView.setTextColor(Color.WHITE)
            if (internetStatus.equals("Lost Internet Connection", ignoreCase = true)) {
                if (internetConnected) {
                    snackbar!!.show()
                    internetConnected = false
                }
            } else {
                if (!internetConnected) {
                    internetConnected = true
                    snackbar!!.show()
                }
            }
        } catch (e: Exception) {
            print(e)
        }
    }
    override fun onPause() {
        super.onPause()
        unregisterReceiver(broadcastReceiver)
    }
    override fun onResume() {
        super.onResume()
        registerInternetCheckReceiver()
    }
//Check internet connectivity
    fun checkConnectivity(context: Context): Boolean {
        val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val activeNetwork: NetworkInfo? = connectivityManager.activeNetworkInfo
        if (activeNetwork?.isConnected != null) {
            return activeNetwork.isConnected
        } else {
            return false
        }
    }
}

WeatherRepository.kt
Contains ViewModel  send data to view class of  Current Weather Report and Next day Weather Report and  fetch repository data  from model Class using Interface of retrofit network Class.

class WeatherRepository : ViewModel() {
     val TAG: String?=WeatherRepository::class.java.simpleName
     private val apiRequest: APIInterface  = RetrofitRequest.getRetrofitInstance().create(APIInterface::class.java)
    fun getCurrentWeatherReport(access_key: String,query: String): LiveData<WeatherReport> {
        Log.d(TAG, "onResponse response:: $access_key  $query")
        val data = MutableLiveData<WeatherReport>()
        apiRequest.getCurrentWeatherReport(access_key, query)
            .enqueue(object : Callback<WeatherReport> {
                override fun onResponse(call: Call<WeatherReport>, response: Response<WeatherReport>) {
                   //   Log.d(TAG, "onResponse response:: ${response.isSuccessful}")
               /*     Log.d(TAG, "onResponse response:: ${Gson().toJson(response)}")
*/
                    if (response.body() != null) {
                        data.value=response.body()
                        //     Log.d(TAG, "onResponse response:: ${data.value?.main?.temp}")
                    }
                }
                override fun onFailure(call: Call<WeatherReport>, t: Throwable) {
//                    data.value=null
                }
            })
        return data
    }
    fun getForecastWeatherReport(access_key: String,query: String): LiveData<WeatherNextDaysReport> {
        Log.d(TAG, "onResponse response:: $access_key  $query")
        val data = MutableLiveData<WeatherNextDaysReport>()
        apiRequest.getForecastWeatherReport(access_key, query)
            .enqueue(object : Callback<WeatherNextDaysReport> {
                override fun onResponse(call: Call<WeatherNextDaysReport>, response: Response<WeatherNextDaysReport>) {
           Log.d(TAG, "onResponse response:: ${Gson().toJson(response)}")
                    if (response.body() != null) {
                        data.value=response.body()
                    }
                }
                override fun onFailure(call: Call<WeatherNextDaysReport>, t: Throwable) {
                   // data.value=null
                }
            })
        return data
    }
}


Further More Model Classes can be found on my github Account with better Explanation
Github Link: https://github.com/eduxcellence/WeatherApp_Kotlin/




Comments

Post a Comment

Popular posts from this blog

Basic widgets : Text and Center

-
Image
Text The  Text  widget lets you create a run of styled text within your application. Source Code : import 'package:flutter/material.dart' ; void main() {                                  // main function  .....   runApp( Text (                                 // Text Widget  .....     "Hello Flutter 1.7" ,                       // data ....     textAlign: TextAlign. center ,               // alignment ....   ...
Read more

4. Do Coding

-
Image
Write your first Flutter app, part 1 Docs Get started Write your first app This is a guide to creating your first Flutter app. If you are familiar with object-oriented code and basic programming concepts such as variables, loops, and conditionals, you can complete this tutorial. You don’t need previous experience with Dart or mobile programming. This guide is part 1 of a two-part codelab. You can find  part 2  on  Google Developers .  Part 1  can also be found on  Google Developers . What you’ll build in part 1 You’ll implement a simple mobile app that generates proposed names for a startup company. The user can select and unselect names, saving the best ones. The code lazily generates names. As the user scrolls, more names are generated. There is no limit to how far a user can scroll. The animated GIF shows how the app works at the completion of part 1. What you’ll learn in part 1 How to write a Flutter app that looks natural on both...
Read more