How we check Battery Percentage in Android

Make a new project in android.

In BatteryLevelActivity.java

package com.android.checkbatterylevel;

import android.app.Activity;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class BatteryLevelActivity extends Activity {

    /** Called when the activity is first created. */

public static TextView txt;

Button btn;

BatteryChangeReceiver batteryReceiver = null;

IntentFilter batFilter = null;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        txt = (TextView)findViewById(R.id.text1);

        btn = (Button)findViewById(R.id.button1);

        btn.setOnClickListener(new View.OnClickListener() {

    public void onClick(View v) {

                // TODO Auto-generated method stub

                batteryReceiver =  new BatteryChangeReceiver();

                batFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); 

                registerReceiver(batteryReceiver, batFilter);

            }

});

    }

}

In BatteryChangeReceiver.java

package com.android.checkbatterylevel;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.util.Log;

public class BatteryChangeReceiver extends BroadcastReceiver{

public final String ACTION1 = Intent.ACTION_BATTERY_CHANGED;

@Override

public void onReceive(Context arg0, Intent intent) {

if(intent.getAction().equals(ACTION1)){

int level = intent.getIntExtra("level", 0);

BatteryLevelActivity.txt.setText("Battery Level is-> " + level);

Log.e("Battery Level : "," : "+level);

}

}

}

In main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"    
    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

<TextView  

   android:layout_width="fill_parent" 

   android:layout_height="wrap_content" 

   android:id="@+id/text1"/>

<Button android:text="Check Battery Level" 

android:id="@+id/button1" 

android:layout_width="wrap_content" 

android:layout_height="wrap_content"/>

</LinearLayout>

In AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

      package="com.android.checkbatterylevel"

      android:versionCode="1"

      android:versionName="1.0">

   <application android:icon="@drawable/icon" android:label="@string/app_name">

        <activity android:name=".BatteryLevelActivity"

                  android:label="@string/app_name">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

<receiver android:name="BatteryChangeReceiver"></receiver>

    </application>

</manifest>

Run the program you will get like this :