reference: http://developer.android.com/training/monitoring-device-state/battery-monitoring.html#MonitorChargeState
In the Android guide, it advise to get status of battery, such as BATTERY_STATUS_CHARGING, BATTERY_STATUS_FULL
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
But in my test on Nexus 7 WiFi (2012) running Android 5.1, status always return -1.
In my example, I change it as:
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = context.registerReceiver(null, ifilter);
status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
MyBatteryReceiver.java, our BroadcastReceiver to monitor change of Charging State and Battery Level.
package com.example.androidbattery;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.widget.Toast;
public class MyBatteryReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
String strAction;
if(action == Intent.ACTION_BATTERY_LOW){
strAction = "ACTION_BATTERY_LOW";
}else if(action == Intent.ACTION_BATTERY_OKAY){
strAction = "ACTION_BATTERY_OKAY";
}else if(action == Intent.ACTION_POWER_CONNECTED){
strAction = "ACTION_POWER_CONNECTED";
}else if(action == Intent.ACTION_POWER_DISCONNECTED){
strAction = "ACTION_POWER_DISCONNECTED";
}else{
strAction = "unknown!";
}
/* === for status detection in BroadcastReceiver === */
int status;
/*
* advised in Android doc: http://goo.gl/xYemvi
* but in my test on Nexus 7 WiFi (2012) Android 5.1
* status always return -1
*/
//status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
/* I change it like this */
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = context.registerReceiver(null, ifilter);
status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
/* ===== */
String msg;
switch(status){
case BatteryManager.BATTERY_STATUS_CHARGING:
msg = "status = BATTERY_STATUS_CHARGING\n";
break;
case BatteryManager.BATTERY_STATUS_DISCHARGING:
msg = "status = BATTERY_STATUS_DISCHARGING\n";
break;
case BatteryManager.BATTERY_STATUS_FULL:
msg = "status = BATTERY_STATUS_FULL\n";
break;
case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
msg = "status = BATTERY_STATUS_NOT_CHARGING\n";
break;
case BatteryManager.BATTERY_STATUS_UNKNOWN:
msg = "status = BATTERY_STATUS_UNKNOWN\n";
break;
default:
msg = "status = ...unknown!\n";
}
int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
if(chargePlug == BatteryManager.BATTERY_PLUGGED_USB){
msg += "Plaugged USB\n";
}
if(chargePlug == BatteryManager.BATTERY_PLUGGED_AC){
msg += "Plaugged AC\n";
}
Toast.makeText(
context,
"MyBatteryReceiver: " + action + "\n"
+ intent.toString()
+ strAction + "\n"
+ "\n"
+ status + " : " + msg,
Toast.LENGTH_LONG).show();
}
}
Modify AndroidManifest.xml, to add <receiver>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidbattery"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="22" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".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>
<receiver android:name=".MyBatteryReceiver" >
<intent-filter>
<action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
<action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
<action android:name="android.intent.action.ACTION_BATTERY_LOW" />
<action android:name="android.intent.action.ACTION_BATTERY_OKAY"/>
</intent-filter>
</receiver>
</application>
</manifest>
package com.example.androidbattery;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Bundle;
/*
* reference:
* http://developer.android.com/training/monitoring-device-state/battery-monitoring.html
*/
public class MainActivity extends ActionBarActivity {
Button btnReadBattery;
ImageView imageIcon;
TextView textBatteryStatus;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnReadBattery = (Button)findViewById(R.id.readbattery);
imageIcon = (ImageView)findViewById(R.id.icon);
textBatteryStatus = (TextView)findViewById(R.id.batterystatus);
btnReadBattery.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
textBatteryStatus.setText(readBattery());
}});
}
private String readBattery(){
StringBuilder sb = new StringBuilder();
IntentFilter batteryIntentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryIntent = registerReceiver(null, batteryIntentFilter);
boolean present= batteryIntent.getExtras().getBoolean(BatteryManager.EXTRA_PRESENT);
sb.append("PRESENT: " + present + "\n");
int status = batteryIntent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
if(status == BatteryManager.BATTERY_STATUS_CHARGING){
sb.append("BATTERY_STATUS_CHARGING\n");
}
if(status == BatteryManager.BATTERY_STATUS_FULL){
sb.append("BATTERY_STATUS_FULL\n");
}
int plugged = batteryIntent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
if(plugged == BatteryManager.BATTERY_PLUGGED_USB){
sb.append("BATTERY_PLUGGED_USB\n");
}
if(plugged == BatteryManager.BATTERY_PLUGGED_AC){
sb.append("BATTERY_PLUGGED_AC\n");
}
int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
sb.append("LEVEL: " + level + "\n");
int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
sb.append("SCALE: " + scale + "\n");
int health = batteryIntent.getIntExtra(BatteryManager.EXTRA_HEALTH,0);
sb.append("health: " + convHealth(health) + "\n");
String technology = batteryIntent.getExtras().getString(BatteryManager.EXTRA_TECHNOLOGY);
sb.append("TECHNOLOGY: " + technology + "\n");
int temperature = batteryIntent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE,0);
sb.append("TEMPERATURE: " + temperature + "\n");
int voltage = batteryIntent.getIntExtra(BatteryManager.EXTRA_VOLTAGE,0);
sb.append("VOLTAGE: " + voltage + "\n");
//I have no idea how to load the small icon from system resources!
int icon_small_resourceId = batteryIntent.getIntExtra(BatteryManager.EXTRA_ICON_SMALL,0);
sb.append("ICON_SMALL: " + icon_small_resourceId + "\n");
return sb.toString();
}
private String convHealth(int health){
String result;
switch(health){
case BatteryManager.BATTERY_HEALTH_COLD:
result = "BATTERY_HEALTH_COLD";
break;
case BatteryManager.BATTERY_HEALTH_DEAD:
result = "BATTERY_HEALTH_DEAD";
break;
case BatteryManager.BATTERY_HEALTH_GOOD:
result = "BATTERY_HEALTH_GOOD";
break;
case BatteryManager.BATTERY_HEALTH_OVERHEAT:
result = "BATTERY_HEALTH_OVERHEAT";
break;
case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
result = "BATTERY_HEALTH_OVER_VOLTAGE";
break;
case BatteryManager.BATTERY_HEALTH_UNKNOWN:
result = "BATTERY_HEALTH_UNKNOWN";
break;
case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
result = "BATTERY_HEALTH_UNSPECIFIED_FAILURE";
break;
default:
result = "unkknown";
}
return result;
}
}
activity_main.xml
<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"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.androidbattery.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<Button
android:id="@+id/readbattery"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Read Battery" />
<TextView
android:id="@+id/batterystatus"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
Download the files.
