<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".BatteryIndicatorExample"
    android:padding="16dp"
    android:gravity="center"
    android:background="@color/colorWhite"
    android:orientation="vertical">

    <TextView
        android:id="@+id/batterylevel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textColor="@color/colorBlack"
        android:textSize="30sp"
        android:gravity="center"/>

    <ProgressBar
        android:id="@+id/progressbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        style="@style/Widget.AppCompat.ProgressBar.Horizontal"
        android:max="100"
        android:minHeight="40dp"
        android:minWidth="200dp"/>
</LinearLayout>

                                    
                                  

                                    
                                        package com.example.widgets;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ProgressBar;
import android.widget.TextView;

public class BatteryIndicatorExample extends AppCompatActivity {

    TextView textView;
    ProgressBar progressBar;
    BroadcastReceiver broadcastReceiver;

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

        textView = findViewById(R.id.batterylevel);
        progressBar = findViewById(R.id.progressbar);

        batteryLevel();
        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(broadcastReceiver, intentFilter);
    }

    private void batteryLevel() {
        broadcastReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
                textView.setText("Battery Level Remaining: " + Integer.toString(level) + "%");
                progressBar.setProgress(level);
            }
        };
    }
}
                                    
                                  

                                    
                                        package com.example.widgets

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.os.BatteryManager
import android.os.Bundle
import android.widget.ProgressBar
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity

class BatteryIndicatorExample : AppCompatActivity() {

    private lateinit var textView: TextView
    private lateinit var progressBar: ProgressBar
    private lateinit var broadcastReceiver: BroadcastReceiver

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_battery_indicator_example)

        textView = findViewById(R.id.batterylevel)
        progressBar = findViewById(R.id.progressbar)

        batteryLevel()
        val intentFilter = IntentFilter(Intent.ACTION_BATTERY_CHANGED)
        registerReceiver(broadcastReceiver, intentFilter)
    }

    private fun batteryLevel() {
        broadcastReceiver = object : BroadcastReceiver() {
            override fun onReceive(context: Context, intent: Intent) {
                val level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0)
                textView.text = "Battery Level Remaining: $level%"
                progressBar.progress = level
            }
        }
    }
}