BatteryManager API exists in android to provide battery related function. It allow developer to develop application without draining battery of android user. Smart Developer never waste battery of android phone.
This tutorial teach you how to get current battery level of android phone and notify every time when battery level changes
Getting Current Battery Level
IntentFilter mIntentFilter = new IntentFilter();
mIntentFilter.addAction(Intent.ACTION_BATTERY_LOW);
mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
mIntentFilter.addAction(Intent.ACTION_BATTERY_OKAY);
Intent batteryIntent = registerReceiver(null, mIntentFilter);
float batteryLevel = getBatteryLevel(batteryIntent);
Log.e("Battery Level", String.valueOf(batteryLevel));
Creating Receiver for Observing/Monitoring Battery level changes
1) Create one Receiver and Register it with
private class BatteryReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context arg0, Intent arg1) {
if (arg1.getAction().equalsIgnoreCase(Intent.ACTION_BATTERY_LOW)
|| arg1.getAction().equalsIgnoreCase(
Intent.ACTION_BATTERY_CHANGED)
|| arg1.getAction().equalsIgnoreCase(
Intent.ACTION_BATTERY_OKAY)) {
int level = arg1.getIntExtra("level", 0);
Toast.makeText(BatteryManagerC.this,
"Current Battery " + level + " %", Toast.LENGTH_LONG)
.show();
mTextView
.setText(String
.valueOf("Battery Level Change Detect through Receiver = "
+ level));
}
}
}
2) Register it for Significant changes of battery level
BatteryReceiver mArrow;
private class ThreadM implements Runnable {
@Override
public void run() {
mArrow = new BatteryReceiver();
IntentFilter mIntentFilter = new IntentFilter();
mIntentFilter.addAction(Intent.ACTION_BATTERY_LOW);
mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
mIntentFilter.addAction(Intent.ACTION_BATTERY_OKAY);
Intent batteryIntent = registerReceiver(mArrow, mIntentFilter);
batteryLevel = getBatteryLevel(batteryIntent);
Log.e("Battery Level", String.valueOf(batteryLevel));
}
}
Complete code for listening and getting Battery level will be like this
package com.test;
import android.app.Activity;
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.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
import android.widget.Toast;
public class BatteryManagerC extends Activity {
TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView = (TextView) findViewById(R.id.batterTest);
findViewById(R.id.getBattery).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mTextView.setText(String.valueOf(batteryLevel));
}
});
new Thread(new ThreadM()).start();
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mArrow);
}
BatteryReceiver mArrow;
private class ThreadM implements Runnable {
@Override
public void run() {
mArrow = new BatteryReceiver();
IntentFilter mIntentFilter = new IntentFilter();
mIntentFilter.addAction(Intent.ACTION_BATTERY_LOW);
mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
mIntentFilter.addAction(Intent.ACTION_BATTERY_OKAY);
Intent batteryIntent = registerReceiver(mArrow, mIntentFilter);
batteryLevel = getBatteryLevel(batteryIntent);
Log.e("Battery Level", String.valueOf(batteryLevel));
}
}
float batteryLevel;
private class BatteryReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context arg0, Intent arg1) {
if (arg1.getAction().equalsIgnoreCase(Intent.ACTION_BATTERY_LOW)
|| arg1.getAction().equalsIgnoreCase(
Intent.ACTION_BATTERY_CHANGED)
|| arg1.getAction().equalsIgnoreCase(
Intent.ACTION_BATTERY_OKAY)) {
int level = arg1.getIntExtra("level", 0);
Toast.makeText(BatteryManagerC.this,
"Current Battery " + level + " %", Toast.LENGTH_LONG)
.show();
mTextView
.setText(String
.valueOf("Battery Level Change Detect through Receiver = "
+ level));
}
}
}
public float getBatteryLevel(Intent batteryIntent) {
int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
if (level == -1 || scale == -1) {
return 50.0f;
}
return ((float) level / (float) scale) * 100.0f;
}
}
Finding the Charging State of Battery
public void determineChargingState() {
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = registerReceiver(null, ifilter);
// Are we charging / charged?
int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING
|| status == BatteryManager.BATTERY_STATUS_FULL;
// How are we charging?
int chargePlug = batteryStatus.getIntExtra(
BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
}
