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POException on getSystemService(Context.AUDIO_SERVICE)
 

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    <p>I wanted to create an app that drops an incoming call based on some settings, that seems to be impossible on Android 1.6. So I decided to write an app that changes the Ringer to mute when the call would've been dropped. The thing is that when I call getSystemService(Context.AUDIO_SERVICE) I get an exception.</p> <p>These are my classes:</p> <p>CallReceiver</p> <pre><code>public class CallReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { MyPhoneStateListener phoneListener = new MyPhoneStateListener(); TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE); telephony.listen(phoneListener, PhoneStateListener.LISTEN_CALL_STATE); } } </code></pre> <p>MyPhoneStateListener</p> <pre><code>public class MyPhoneStateListener extends PhoneStateListener { public void onCallStateChanged(int state, String incomingNumber){ if (state == TelephonyManager.CALL_STATE_RINGING) { Log.d("DEBUG", "RINGING"); (new TMLService()).ManageIncomingCall(incomingNumber); } } } </code></pre> <p>And there is a class called TMLService that extends Service which contains this method</p> <pre><code>public void ManageIncomingCall(String incomingNumber) { super.onCreate(); AudioManager audioManage = (AudioManager)getSystemService(Context.AUDIO_SERVICE); audioManage.setRingerMode(AudioManager.RINGER_MODE_SILENT); } </code></pre> <p>Like I said, when I call AudioManager audioManage = (AudioManager)getSystemService(Context.AUDIO_SERVICE); the application stops and this is what I get in the LogCat:</p> <pre><code>D/DEBUG ( 356): RINGING D/AndroidRuntime( 356): Shutting down VM W/dalvikvm( 356): threadid=3: thread exiting with uncaught exception (group=0x4001aa28) E/AndroidRuntime( 356): Uncaught handler: thread main exiting due to uncaught exception D/CallNotifier( 103): RINGING... (new) E/AndroidRuntime( 356): java.lang.NullPointerException E/AndroidRuntime( 356): at android.content.ContextWrapper.getSystemService(ContextWrapper.java:335) E/AndroidRuntime( 356): at tml.v1.Service.TMLService.ManageIncomingCall(TMLService.java:94) E/AndroidRuntime( 356): at tml.v1.Service.MyPhoneStateListener.onCallStateChanged(MyPhoneStateListener.java:14) E/AndroidRuntime( 356): at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:298) E/AndroidRuntime( 356): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime( 356): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime( 356): at android.app.ActivityThread.main(ActivityThread.java:4203) E/AndroidRuntime( 356): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 356): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime( 356): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) E/AndroidRuntime( 356): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) E/AndroidRuntime( 356): at dalvik.system.NativeStart.main(Native Method) D/CallNotifier( 103): onNewRingingConnection(): incoming </code></pre>
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