恢复出厂设置

/Settings/src/com/android/settings/MasterClearConfirm.java
    private void doMasterClear() {
        if (mEraseSdCard) {
            Intent intent = new Intent(ExternalStorageFormatter.FORMAT_AND_FACTORY_RESET);
            intent.putExtra(Intent.EXTRA_REASON, "MasterClearConfirm");
            intent.setComponent(ExternalStorageFormatter.COMPONENT_NAME);
            getActivity().startService(intent);
        } else {
            Intent intent = new Intent(Intent.ACTION_MASTER_CLEAR);
            intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
            intent.putExtra(Intent.EXTRA_REASON, "MasterClearConfirm");
            getActivity().sendBroadcast(intent);
            // Intent handling is asynchronous -- assume it will happen soon.
        }
    }
./frameworks/base/services/core/java/com/android/server/MasterClearReceiver.java