Get battery level and state in Android

Question

How can I get battery level and state  plugged in  discharging  charging  etc   I researched the developer docs and I found a BatteryManager class  But it doesn t contain any methods  just constants  How do I even use it

User · Answer

You can use this to get remaining charged in percentage   private void batteryLevel             BroadcastReceiver batteryLevelReceiver   new BroadcastReceiver                 public void onReceive Context context  Intent intent                    context unregisterReceiver this                   int rawlevel   intent getIntExtra BatteryManager EXTRA LEVEL  -1                   int scale   intent getIntExtra BatteryManager EXTRA SCALE  -1                   int level   -1                  if  rawlevel  gt   0  amp  amp  scale  gt  0                        level    rawlevel   100    scale                                    batterLevel setText  Battery Level Remaining      level                                          IntentFilter batteryLevelFilter   new IntentFilter Intent ACTION BATTERY CHANGED           registerReceiver batteryLevelReceiver  batteryLevelFilter

User · Answer

Here is a code sample that explains how to get battery information  To sum it up  a broadcast receiver for the ACTION BATTERY CHANGED intent is set up dynamically  because it can not be received through components declared in manifests  only by explicitly registering for it with Context registerReceiver    public class Main extends Activity     private TextView batteryTxt    private BroadcastReceiver mBatInfoReceiver   new BroadcastReceiver         Override     public void onReceive Context ctxt  Intent intent          int level   intent getIntExtra BatteryManager EXTRA LEVEL  -1         int scale   intent getIntExtra BatteryManager EXTRA SCALE  -1         float batteryPct   level   100    float scale        batteryTxt setText String valueOf batteryPct     quot   quot                   Override   public void onCreate Bundle b        super onCreate b       setContentView R layout main       batteryTxt    TextView  this findViewById R id batteryTxt       this registerReceiver this mBatInfoReceiver  new IntentFilter Intent ACTION BATTERY CHANGED

User · Answer

To check battery percentage we use BatteryManager  the following method will return battery percentage   Source Link  public static float getBatteryLevel Context context  Intent intent        Intent batteryStatus   context registerReceiver null              new IntentFilter Intent ACTION BATTERY CHANGED        int batteryLevel   -1      int batteryScale   1      if  batteryStatus    null            batteryLevel   batteryStatus getIntExtra BatteryManager EXTRA LEVEL  batteryLevel           batteryScale   batteryStatus getIntExtra BatteryManager EXTRA SCALE  batteryScale             return batteryLevel    float  batteryScale   100

User · Answer

one mistake in official docs  you must use double instead float  Because 0 53F   100F   52F  int level   batteryStatus    null    batteryStatus getIntExtra BatteryManager EXTRA LEVEL  -1    -1  int scale    batteryStatus    null   batteryStatus getIntExtra BatteryManager EXTRA SCALE  -1    -1   double batteryPct    double  level    double  scale  int percent    int   batteryPct   100D

User · Answer

Based on official android docs  you can use this method in a Helper or Util class to get current battery percentage  Java version  public static int getBatteryPercentage Context context         if  Build VERSION SDK INT  gt   21              BatteryManager bm    BatteryManager  context getSystemService BATTERY SERVICE            return bm getIntProperty BatteryManager BATTERY PROPERTY CAPACITY          else             IntentFilter iFilter   new IntentFilter Intent ACTION BATTERY CHANGED            Intent batteryStatus   context registerReceiver null  iFilter             int level   batteryStatus    null   batteryStatus getIntExtra BatteryManager EXTRA LEVEL  -1    -1           int scale   batteryStatus    null   batteryStatus getIntExtra BatteryManager EXTRA SCALE  -1    -1            double batteryPct   level    double  scale            return  int   batteryPct   100           Kotlin version  fun getBatteryPercentage context  Context   Int       return if  Build VERSION SDK INT  gt   21            val bm   context getSystemService BATTERY SERVICE  as BatteryManager         bm getIntProperty BatteryManager BATTERY PROPERTY CAPACITY             else           val iFilter   IntentFilter Intent ACTION BATTERY CHANGED          val batteryStatus  Intent   context registerReceiver null  iFilter          val level   batteryStatus  getIntExtra BatteryManager EXTRA LEVEL  -1          val scale   batteryStatus  getIntExtra BatteryManager EXTRA SCALE  -1          val batteryPct   level   scale toDouble            batteryPct   100  toInt

User · Answer

private void batteryLevel             BroadcastReceiver batteryLevelReceiver   new BroadcastReceiver                 public void onReceive Context context  Intent intent                    context unregisterReceiver this                   int rawlevel   intent getIntExtra  level   -1                   int scale   intent getIntExtra  scale   -1                   int level   -1                  if  rawlevel  gt   0  amp  amp  scale  gt  0                        level    rawlevel   100    scale                                    mBtn setText  Battery Level Remaining      level                                          IntentFilter batteryLevelFilter   new IntentFilter Intent ACTION BATTERY CHANGED           registerReceiver batteryLevelReceiver  batteryLevelFilter

User · Answer

You don t have to register an actual BroadcastReceiver as Android s BatteryManager is using a sticky Intent   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   level    float scale   return  int  batteryPct 100     This is from the official docs over at https   developer android com training monitoring-device-state battery-monitoring html

User · Answer

Other answers didn t mention how to access battery status  chraging or not    IntentFilter ifilter   new IntentFilter Intent ACTION BATTERY CHANGED   Intent batteryStatus   context 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

User · Answer

Since SDK 21 LOLLIPOP it is possible to use the following to get current battery level as a percentage  BatteryManager bm    BatteryManager  context getSystemService BATTERY SERVICE   int batLevel   bm getIntProperty BatteryManager BATTERY PROPERTY CAPACITY    Read BatteryManager       Android Developers - BATTERY PROPERTY CAPACITY

User · Answer

try this function no need permisson or any reciver  void getBattery percentage           IntentFilter ifilter   new IntentFilter Intent ACTION BATTERY CHANGED         Intent batteryStatus   getApplicationContext   registerReceiver null  ifilter         int level   batteryStatus getIntExtra BatteryManager EXTRA LEVEL  -1         int scale   batteryStatus getIntExtra BatteryManager EXTRA SCALE  -1         float batteryPct   level    float scale        float p   batteryPct   100         Log d  Battery percentage  String valueOf Math round p

[java] Get battery level and state in Android

Examples related to java

Examples related to android

Examples related to battery