Detecting Battery Charging Android

Question

I;m programmatically rejecting an incoming calls. The "call reject" and "sendSMS" work fine, but I want to reject the call only if the phone is in charging mode.

I'm trying to implement the following code :

  case TelephonyManager.CALL_STATE_RINGING:

        if (isCharging())
        {
            reject();
            sendSMS(incomingNumber);
        } 

  break;

isCharging:

public boolean isCharging()
{
    IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    Intent batteryStatus = contextMember.registerReceiver(null, ifilter);
    int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
    boolean bCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                         status == BatteryManager.BATTERY_STATUS_FULL;
    return bCharging;
}

But the app keeps crushing on incoming call.

Please help me to figure this out!

I'm receiving the following errors on the LogCat:

  E/AndroidRuntime(11160): FATAL EXCEPTION: main
  E/AndroidRuntime(11160): android.content.ReceiverCallNotAllowedException:         IntentReceiver components are not allowed to register to receive intents
  E/AndroidRuntime(11160):  at     android.app.ReceiverRestrictedContext.registerReceiver(ContextImpl.java:163)
  E/AndroidRuntime(11160):  at android.app.ReceiverRestrictedContext.registerReceiver(ContextImpl.java:157)
  E/AndroidRuntime(11160):  at   com.SmartDialer_app.SmartDialer.MyPhoneStateListener.isCharging(MyPhoneStateListener.java:106)
  E/AndroidRuntime(11160):  at  com.SmartDialer_app.SmartDialer.MyPhoneStateListener.onCallStateChanged(MyPhoneStateListene r.java:57)
  E/AndroidRuntime(11160):  at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:393)
  E/AndroidRuntime(11160):  at android.os.Handler.dispatchMessage(Handler.java:99)
  E/AndroidRuntime(11160):  at android.os.Looper.loop(Looper.java:137)
  E/AndroidRuntime(11160):  at  android.app.ActivityThread.main(ActivityThread.java:4898)
  E/AndroidRuntime(11160):  at java.lang.reflect.Method.invokeNative(Native Method)
  E/AndroidRuntime(11160):  at java.lang.reflect.Method.invoke(Method.java:511)
  E/AndroidRuntime(11160):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
  E/AndroidRuntime(11160):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
  E/AndroidRuntime(11160):  at dalvik.system.NativeStart.main(Native Method)
  E/AndroidRuntime(11160): FATAL EXCEPTION: main
  E/AndroidRuntime(11160): android.content.ReceiverCallNotAllowedException: IntentReceiver components are not allowed to register to receive intents
  E/AndroidRuntime(11160):  at android.app.ReceiverRestrictedContext.registerReceiver(ContextImpl.java:163)
  E/AndroidRuntime(11160):  at android.app.ReceiverRestrictedContext.registerReceiver(ContextImpl.java:157)
  E/AndroidRuntime(11160):  at com.SmartDialer_app.SmartDialer.MyPhoneStateListener.isCharging(MyPhoneStateListener.java:1 06)
  E/AndroidRuntime(11160):  at com.SmartDialer_app.SmartDialer.MyPhoneStateListener.onCallStateChanged(MyPhoneStateListener.java:57)
  E/AndroidRuntime(11160):  at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:393)
  E/AndroidRuntime(11160):  at android.os.Handler.dispatchMessage(Handler.java:99)
  E/AndroidRuntime(11160):  at android.os.Looper.loop(Looper.java:137)
  E/AndroidRuntime(11160):  at android.app.ActivityThread.main(ActivityThread.java:4898)
  E/AndroidRuntime(11160):  at java.lang.reflect.Method.invokeNative(Native Method)
  E/AndroidRuntime(11160):  at java.lang.reflect.Method.invoke(Method.java:511)
  E/AndroidRuntime(11160):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
  E/AndroidRuntime(11160):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
 E/AndroidRuntime(11160):   at dalvik.system.NativeStart.main(Native Method)

Thank you.

Answer 1

Your isCharging() method is presumably being called from onReceive() of a BroadcastReceiver. In that case, you cannot call registerReceiver() directly, even with a null first parameter.

Instead of:

 Intent batteryStatus = contextMember.registerReceiver(null, ifilter);

try:

 Intent batteryStatus = contextMember.getApplicationContext().registerReceiver(null, ifilter);

See this blog post for more background.