A work in progress
This is just so I have a kind of backup and reference.
activity_main.xml
The layout file.
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Battery Monitor"
android:textSize="50sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.491"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.066" />
<Button
android:id="@+id/btn_Feedback"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Feedback"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.946"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.909" />
<Button
android:id="@+id/btn_Update"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Update"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.097"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.909" />
<Button
android:id="@+id/btn_Exit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Exit"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.95"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0" />
<TextView
android:id="@+id/tv_LastReading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Last reading: "
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.090"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.226" />
<TextView
android:id="@+id/tv_LastReadingData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="NA"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.169"
app:layout_constraintStart_toEndOf="@+id/tv_LastReading"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.226" />
<TextView
android:id="@+id/tv_Temperature"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:text="Temperature: "
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.090"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tv_LastReading" />
<TextView
android:id="@+id/tv_TemperatureData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:text="NA"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.160"
app:layout_constraintStart_toEndOf="@+id/tv_Temperature"
app:layout_constraintTop_toBottomOf="@+id/tv_LastReadingData" />
<TextView
android:id="@+id/tv_BatteryOneData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="32dp"
android:text="NA"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.025"
app:layout_constraintStart_toEndOf="@+id/tv_BatteryOne"
app:layout_constraintTop_toBottomOf="@+id/tv_TemperatureData" />
<TextView
android:id="@+id/tv_BatteryTwoData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="32dp"
android:text="NA"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.025"
app:layout_constraintStart_toEndOf="@+id/tv_BatteryTwo"
app:layout_constraintTop_toBottomOf="@+id/tv_BatteryOneData" />
<TextView
android:id="@+id/tv_BatteryOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:text="Batterybank 1: "
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.090"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tv_Temperature" />
<TextView
android:id="@+id/tv_BatteryTwo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:text="Batterybank 2: "
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.090"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tv_BatteryOne" />
</androidx.constraintlayout.widget.ConstraintLayout>
build.gradle
Add this line:
implementation "org.jetbrains.anko:anko:0.10.4"
MainActivity.kt
The main program file:
package com.example.batterymonitorv01
import android.content.Intent
import android.content.Intent.ACTION_VIEW
import android.net.Uri
import android.os.Bundle
import android.widget.Button
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import com.example.batterymonitor02.R
import org.jetbrains.anko.doAsync
import org.jetbrains.anko.toast
import org.jetbrains.anko.uiThread
import java.net.URL
import java.util.concurrent.Executors
import kotlin.system.exitProcess
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
/* Declare the buttons */
val btnExit: Button = findViewById(R.id.btn_Exit)
val btnUpdate: Button = findViewById(R.id.btn_Update)
val btnFeedBack: Button = findViewById(R.id.btn_Feedback)
/* Declare button listeners */
btnExit.setOnClickListener {
finish()
exitProcess(0)
}
btnUpdate.setOnClickListener {
readData()
}
btnFeedBack.setOnClickListener {
val openURL = Intent(ACTION_VIEW)
openURL.data = Uri.parse("https:www.google.com/")
startActivity(openURL)
}
/* Read the data when app starts */
readData()
}
private fun readData() {
val tvLastReadingData : TextView = findViewById(R.id.tv_LastReadingData)
val tvTemperatureData : TextView = findViewById(R.id.tv_TemperatureData)
val executor = Executors.newScheduledThreadPool(5)
doAsync(executorService = executor) {
val resultTemperature = URL("http://nerdegutta.org/kajsa/lastreadings/last_temperature.php").readText()
val resultTime = URL("http://nerdegutta.org/kajsa/lastreadings/last_time.php").readText()
uiThread {
tvTemperatureData.text=resultTemperature
tvTemperatureData.append("?C")
tvLastReadingData.text=resultTime
}
}
toast("Updated!")
}
}
AndroidManifest.xml
The manifest file:
Add permission to use INTERNET Add permission to use ClearText
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.batterymonitor02">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.BatteryMonitor02"
android:usesCleartextTraffic="true">
<activity
android:name="com.example.batterymonitorv01.MainActivity"
android:exported="true"
tools:ignore="MissingClass">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>