how to observe battery charging level in android

Today we are going to discuss about how to monitoring battery charging level in android.we get battery charging level by using BatteryManager and Sticky Intent . it is very easy

BatteryManager: It gives total information regarding battery

Intent.ACTION_BATTERY_CHANGED :is one of Sticky Intent

Create a Project

add the below permission in your AndroidManifest.xml file

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

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ypp.battery"
    android:versionCode="4"
    android:versionName="1.3" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="21" />
 
     <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <application
     
     
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
       >
        <activity
            android:name="com.ypp.battery.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
     
    </application>


</manifest>

then create java file and add the below code in your java file


        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus = registerReceiver(null, ifilter);
        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

        float batteryPct = ((float)level / (float)scale) * 100.0f;
        int a=(int) batteryPct;
        batterypercentage.setText(String.valueOf(a)+"%");

Note: batterypercentage is TextView

Finally,Run your application

OUTPUT: