170     private ToneGenerator mToneGenerator;  field in EmergencyDialer
346             if (mToneGenerator == null) {  in onCreate()
348                     mToneGenerator = new ToneGenerator(DIAL_TONE_STREAM_TYPE, TONE_RELATIVE_VOLUME);  in onCreate()
351                     mToneGenerator = null;  in onCreate()
373             if (mToneGenerator != null) {  in onDestroy()
374                 mToneGenerator.release();  in onDestroy()
375                 mToneGenerator = null;  in onDestroy()
645             if (mToneGenerator == null) {  in onResume()
647                     mToneGenerator = new ToneGenerator(AudioManager.STREAM_DTMF,  in onResume()
651                     mToneGenerator = null;  in onResume()
808             if (mToneGenerator == null) {  in playTone()
814             mToneGenerator.startTone(tone, TONE_LENGTH_MS);  in playTone()