MidiScope/Application/src/main/java/com/example/android/common/midi/MidiPortSelector.java [132:163]:
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    public void onDeviceStatusChanged(final MidiDeviceStatus status) {
        // If an input port becomes busy then remove it from the menu.
        // If it becomes free then add it back to the menu.
        if (mType == MidiDeviceInfo.PortInfo.TYPE_INPUT) {
            MidiDeviceInfo info = status.getDeviceInfo();
            Log.i(MidiConstants.TAG, "MidiPortSelector.onDeviceStatusChanged status = " + status
                    + ", mType = " + mType
                    + ", activity = " + mActivity.getPackageName()
                    + ", info = " + info);
            // Look for transitions from free to busy.
            int portCount = info.getInputPortCount();
            for (int i = 0; i < portCount; ++i) {
                MidiPortWrapper wrapper = new MidiPortWrapper(info, mType, i);
                if (!wrapper.equals(mCurrentWrapper)) {
                    if (status.isInputPortOpen(i)) { // busy?
                        if (!mBusyPorts.contains(wrapper)) {
                            // was free, now busy
                            mBusyPorts.add(wrapper);
                            mAdapter.remove(wrapper);
                            mAdapter.notifyDataSetChanged();
                        }
                    } else {
                        if (mBusyPorts.remove(wrapper)) {
                            // was busy, now free
                            mAdapter.add(wrapper);
                            mAdapter.notifyDataSetChanged();
                        }
                    }
                }
            }
        }
    }
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MidiSynth/Application/src/main/java/com/example/android/common/midi/MidiPortSelector.java [132:163]:
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    public void onDeviceStatusChanged(final MidiDeviceStatus status) {
        // If an input port becomes busy then remove it from the menu.
        // If it becomes free then add it back to the menu.
        if (mType == MidiDeviceInfo.PortInfo.TYPE_INPUT) {
            MidiDeviceInfo info = status.getDeviceInfo();
            Log.i(MidiConstants.TAG, "MidiPortSelector.onDeviceStatusChanged status = " + status
                    + ", mType = " + mType
                    + ", activity = " + mActivity.getPackageName()
                    + ", info = " + info);
            // Look for transitions from free to busy.
            int portCount = info.getInputPortCount();
            for (int i = 0; i < portCount; ++i) {
                MidiPortWrapper wrapper = new MidiPortWrapper(info, mType, i);
                if (!wrapper.equals(mCurrentWrapper)) {
                    if (status.isInputPortOpen(i)) { // busy?
                        if (!mBusyPorts.contains(wrapper)) {
                            // was free, now busy
                            mBusyPorts.add(wrapper);
                            mAdapter.remove(wrapper);
                            mAdapter.notifyDataSetChanged();
                        }
                    } else {
                        if (mBusyPorts.remove(wrapper)) {
                            // was busy, now free
                            mAdapter.add(wrapper);
                            mAdapter.notifyDataSetChanged();
                        }
                    }
                }
            }
        }
    }
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