Java (Android Studio) Tutorial - Battery Checker -

BatteryReceiver.java

package com.codingwithsara.batterychecker;

import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    private BatteryReceiver mBatteryReceiver = new BatteryReceiver();
    private IntentFilter mIntentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);

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

    @Override
    protected void onResume() {
        super.onResume();
        registerReceiver(mBatteryReceiver, mIntentFilter);
    }

    @Override
    protected void onPause() {
        unregisterReceiver(mBatteryReceiver);
        super.onPause();
    }
}