How can I save data in mobile phone using j2me?
I want code examples which describes how to store data in mobile phones using j2me.
Further how to give access permission to read/write in mobile phones?
I am using netbeans 6.5 and motorola L6 phone.
Can any one tell me a code example giving how to store, give read/write permission?
You can save data in the record management store. There are some limitations though. The biggest one is that only your application will be able to read the data.
An alternative is to use the FileConnection API, which offers access to the device's file system. All modern phones should support it. However, unless the Midlet is signed, the user will be nagged to give permission to access a file.
Use the PDAPDemo example code from the Sun Wireless Toolkit.
Last time I checked it had a few error handling bugs but it is easily modifiable.
It will tell you what parts of the handset file system your application can read from and write to, both on the phone and on any eventual memory card.
Related
I'm trying to make my windows computer a valid output for bluetooth audio from my phone. Enabling the actual audio was easy enough using the winrt AudioPlaybackConnection, but I'm trying to get metadata working and running into dead ends in the Windows UWP documentation. I'm familiar with the MediaPlayer class, but I can't see how to set the source to the AudioPlaybackConnection. My next thought was to create a MediaPlayer and handle the controls/metadata myself, but I can't see how to access the metadata for the AudioPlaybackConnection either. I tried getting the BluetoothDevice matching the same phone since I see the properties for the actual device list AVRCP Transport and A2DP SNK as two separate hardware "devices" making up the phone device, but I have no more luck accessing metadata with the BluetoothDevice. I know Windows 10 supports Bluetooth's AVRCP and can handle metadata/controls (source), but I'm beginning to think it's under a different device in winrt and I don't have the winrt know-how to track it down.
I've consulted the Bluetooth team about this. But currently, control like this is not supported in Windows at this time. You could submit a feature request about this in the Feedback Hub. Please select Developer Platform->API Feedback as the category when you submit your request. The related team will check the request.
I'm not very experienced with the codes on a cell phone. But I wanted to know how would someone be able to open up the com.sec.android application on a Samsung Galaxy S3 Cell Phone to see hidden contacts, text messages and other information ?
Thanks.
Generally Samsung phones comes with pre-installed applications by default. These applications are system applications which cannot be removed unless the device is rooted. Some applications use content providers to use sensitive information. Some malicious apps can use the content providers to get these sensitive information and can misuse them.
Check out this link so that you can get to know about it and the vulnerabilities.
j2me jar application asks user for permission to make a photo and etc. is there a free way to bypass this? or is there a free webcam aplication for mobile phones?
thanks
The only way to bypass these kinds of warnings is to sign your application with an appropriate security certificate, which is normally not free and varies by device manufacturer and/or wireless carrier. Read Java ME Signing For Dummies for more information.
I wanted to create J2ME application, in which the application should work only with the SIM card that was used during installation. On SIM card (GSM) change the application should now work.
For achieving this, i thought of taking an signature of the simcard and save it in a persistent storage. On every start of the application the signature can be verified. Any idea of how to implement this.
Thanks in advance
The 'SATSA' (Security and Trust Services API aka JSR177) could be used from your J2ME application to communicate with the SIM. You could send '3GPP TS 11.11' commands to obtain the IMSI (select file DG_GSM, select file EF_IMSI, read binary).
Drawbacks are: (1) You're talking to the SIM on a relatively low level of abstraction (the ISO7816-4 layer); (2) Not all handsets support JSR177 at the moment.
I believe this is not possible. If it was possible with a specific phone it would not be possible in a generic way.
For ATT in US, for J2ME apps, the handset embeds "CarrierDeviceId" in the Jad file. This is unique per SIM card. So, if something similar is available to you, just read this Jad parameter the first time the app starts, save it to RMS or send it to server. Now each time the app starts, you can verify this number matches, and thus verify the SIM card is same.
You can also try obtaining the phone number that is tied to the SIM card and thus verify the old SIM is being used.
I am writing a windows application (written entirely in C++) which reads files from a storage card on a mobile phone running Windows Mobile. The tough part is, I don't know how to make my application detect the event that a user has connected the mobile phone to the USB of laptop. I did some reading on MSDN and have written a small code using RegisterDeviceNotification, which detects whenever a USB disk is attached/removed from the laptop. However, I am unable to tweak this to make it work for phone type devices. Please help me out through any links/tutroials which explains this(preferrably C++, as I don't know .NET or C#).
Thanks
Alok
According to this article you can use RegisterDeviceNotification to get notifications when activesync detects a device has been plugged/unplugged. (See option 3 at the end of the article)
It may just be a matter of setting up the correct notification filter.
Windows Mobile devices use RNDIS, a network interface protocol behind the scenes. Hence, the RegisterDeviceNotification method still works, but you're looking for a DEV_BROADCAST_DEVICEINTERFACE, not DEV_BROADCAST_VOLUME. (i.e. dbch_devicetype==DBT_DEVTYP_DEVICEINTERFACE)
You can use RAPI or RAPI2 to detect when a Windows Mobile device connects to a PC via Active Sync or Windows Mobile Device Center. RAPI can also be used to read the files on the storage card and much more.
RAPI is simpler to program because it is a C based API. RAPI2 has more functionality than RAPI, but is an object oriented COM API. If your needs are simple and you only care about one device/connection at a time then RAPI is good enough. There are two RAPI functions used to detect connections: CeRapiInit (blocking), and CeRapiInitEx (signals an event upon connection).