private String getDefaultFunctions() {
String func =
SystemProperties.get(USB_PERSISTENT_CONFIG_PROPERTY, UsbManager.USB_FUNCTION_NONE);
if (UsbManager.USB_FUNCTION_NONE.equals(func)) {
func = UsbManager.USB_FUNCTION_MTP;
}
return func;
}
public UsbHandler(Looper looper) {
super(looper);
try {
// Restore default functions.
mCurrentFunctions = SystemProperties.get(USB_CONFIG_PROPERTY, UsbManager.USB_FUNCTION_NONE);
if (UsbManager.USB_FUNCTION_NONE.equals(mCurrentFunctions)) {
mCurrentFunctions = UsbManager.USB_FUNCTION_MTP;
}
mCurrentFunctionsApplied =
mCurrentFunctions.equals(SystemProperties.get(USB_STATE_PROPERTY));
mAdbEnabled =
UsbManager.containsFunction(getDefaultFunctions(), UsbManager.USB_FUNCTION_ADB);
setEnabledFunctions(null, false);
String state = FileUtils.readTextFile(new File(STATE_PATH), 0, null).trim();
updateState(state);
// register observer to listen for settings changes
mContentResolver.registerContentObserver(
Settings.Global.getUriFor(Settings.Global.ADB_ENABLED),
false,
new AdbSettingsObserver());
mContentResolver.registerContentObserver(
Settings.Secure.getUriFor(Settings.Secure.ADB_NOTIFY),
false,
new ContentObserver(null) {
public void onChange(boolean selfChange) {
updateAdbNotification();
}
});
// Watch for USB configuration changes
mUEventObserver.startObserving(USB_STATE_MATCH);
mUEventObserver.startObserving(ACCESSORY_START_MATCH);
} catch (Exception e) {
Slog.e(TAG, "Error initializing UsbHandler", e);
}
}