Checking the Battery Percentage

To check the battery percentage in Android using Kotlin, you can use the BatteryManager system service. Here’s a simple example:

1. Add the necessary permission to your AndroidManifest.xml:

<uses-permission android:name="android.permission.BATTERY_STATS" />

MainActivity.kt

package com.androindian.broad

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.os.BatteryManager
import android.os.BatteryManager.BATTERY_PROPERTY_CAPACITY
import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import com.androindian.broad.databinding.ActivityMainBinding


class MainActivity : AppCompatActivity() {

    var binding: ActivityMainBinding?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding= DataBindingUtil.setContentView(this,R.layout.activity_main)

        
        this.registerReceiver(this.mBatInfoReceiver,  IntentFilter(Intent.ACTION_BATTERY_CHANGED));


    }


    val mBatInfoReceiver: BroadcastReceiver = object : BroadcastReceiver() {
        override fun onReceive(ctxt: Context, intent: Intent) {
            val level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1)
            val scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1)
            val batteryPct = level * 100 / scale.toFloat()
            binding?.show?.text = "$batteryPct%"
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>
<LinearLayout 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"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:id="@+id/show"
         />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/percentage"
        android:text="check battary"/>

</LinearLayout>
</layout>