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Bluetooth Data Transfer Example

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The following example uses the Android Bluetooth APIs to construct a simple peer-to-peer messaging system that works between two paired Bluetooth devices. Unfortunately the Android emulator can’t currently be used to test Bluetooth functionality. In order to test this application you will need to have two physical devices. 1. Start by creating a new BluetoothTexting project featuring a BluetoothTexting Activity. Modify the manifest to include BLUETOOTH and BLUETOOTH_ADMIN permissions. <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.paad.chapter13_bluetoothtexting" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".BluetoothTexting" android:label="@string/app_name"> <in...
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How to encrypt and decrypt strings in android using AES?

Simple helper class to encrypt and decrypt strings using AES128. The result is Ascii-encoded (actually hex, no base64), so no byte[] has to be stored. A SEED value is used as a shared secret ("Master-Password"). Only with the same SEED the stored values can be decrypted.  import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; /**  * Usage:  * <pre>  * String crypto = SimpleCrypto.encrypt(masterpassword, cleartext)  * ...  * String cleartext = SimpleCrypto.decrypt(masterpassword, crypto)  * </pre>  * @author ferenc.hechler  */ public class SimpleCrypto {  public static String encrypt(String seed, String cleartext) throws Exception {   byte[] rawKey = getRawKey(seed.getBytes());   byte[] result = encrypt(rawKey, cleartext.getBytes());   return toHex(result);  }  pu...
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