Fix crash when don't keep activity flag enabled

src/org/linphone/IncomingCallActivity.java

@@ -46,12 +46,22 @@ import android.widget.Toast;
  */
 public class IncomingCallActivity extends Activity implements LinphoneOnCallStateChangedListener, LinphoneSliderTriggered {
 
+	private static IncomingCallActivity instance;
+	
 	private TextView mNameView;
 	private TextView mNumberView;
 	private AvatarWithShadow mPictureView;
 	private LinphoneCall mCall;
 	private LinphoneSliders mIncomingCallWidget;
 	
+	public static IncomingCallActivity instance() {
+		return instance;
+	}
+	
+	public static boolean isInstanciated() {
+		return instance != null;
+	}
+	
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
@@ -70,11 +80,13 @@ public class IncomingCallActivity extends Activity implements LinphoneOnCallStat
         mIncomingCallWidget.setOnTriggerListener(this);
 
         super.onCreate(savedInstanceState);
+		instance = this;
 	}
 
 	@Override
 	protected void onResume() {
 		super.onResume();
+		instance = this;
 		LinphoneManager.addListener(this);
 		// Only one call ringing at a time is allowed
 		List<LinphoneCall> calls = LinphoneUtils.getLinphoneCalls(LinphoneManager.getLc());
@@ -109,6 +121,12 @@ public class IncomingCallActivity extends Activity implements LinphoneOnCallStat
 		LinphoneManager.removeListener(this);
 	}
 	
+	@Override
+	protected void onDestroy() {
+		super.onDestroy();
+		instance = null;
+	}
+	
 	@Override
 	public boolean onKeyDown(int keyCode, KeyEvent event) {
 		if (LinphoneManager.isInstanciated() && (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_HOME)) {

src/org/linphone/LinphoneManager.java

@@ -1031,6 +1031,16 @@ public final class LinphoneManager implements LinphoneCoreListener {
 		}
 	}
 	
+	public Context getActivity() {
+		if (LinphoneActivity.isInstanciated())
+			return LinphoneActivity.instance();
+		else if (InCallActivity.isInstanciated())
+			return InCallActivity.instance();
+		else if (IncomingCallActivity.isInstanciated())
+			return IncomingCallActivity.instance();
+		return null;
+	}
+
 	@SuppressLint("Wakelock")
 	public void callState(final LinphoneCore lc,final LinphoneCall call, final State state, final String message) {
 		Log.i("new state [",state,"]");
@@ -1055,7 +1065,7 @@ public final class LinphoneManager implements LinphoneCoreListener {
 		}
 
 		if (state == CallEnd || state == Error) {
-			TelephonyManager tm = (TelephonyManager) LinphoneActivity.instance().getSystemService(Context.TELEPHONY_SERVICE);
+			TelephonyManager tm = (TelephonyManager) getActivity().getSystemService(Context.TELEPHONY_SERVICE);
 			if (tm.getCallState() == TelephonyManager.CALL_STATE_IDLE) {
 				mAudioManager.setMode(MODE_NORMAL);
 			}
@@ -1432,7 +1442,7 @@ public final class LinphoneManager implements LinphoneCoreListener {
 				boolean sendCamera = mLc.getConferenceSize() == 0;
 				enableCamera(call, sendCamera);
 			}
-			TelephonyManager tm = (TelephonyManager) LinphoneActivity.instance().getSystemService(Context.TELEPHONY_SERVICE);
+			TelephonyManager tm = (TelephonyManager) getActivity().getSystemService(Context.TELEPHONY_SERVICE);
 			if (state == State.CallEnd && mLc.getCallsNb() == 0 && tm.getCallState() == TelephonyManager.CALL_STATE_IDLE) {
 				routeAudioToReceiver();
 			}