所以我正在研究一个arduino项目，该项目通过蓝牙将char发送到我的应用程序。该应用程序接收数据。如果字符为“ 1”，它将播放一个名为“ the”的语音剪辑 否则，如果其“ 2”播放称为“ its_me”的语音剪辑。
该应用程序可以正常运行一段时间（例如2到3分钟），然后崩溃。这是日志猫：
en02-05 21:12:56.060 7715-7715/bluetooth.arduino.ndroid.bluetooth3 E/AndroidRuntime: FATAL EXCEPTION: main
Process: bluetooth.arduino.ndroid.bluetooth3, PID: 7715
android.content.res.Resources$NotFoundException: Resource ID #0x0
at android.content.res.Resources.getValue(Resources.java:1551)
at android.content.res.Resources.openRawResourceFd(Resources.java:1503)
at android.media.MediaPlayer.create(MediaPlayer.java:947)
at android.media.MediaPlayer.create(MediaPlayer.java:930)
at bluetooth.arduino.ndroid.bluetooth3.MainActivity.malek(MainActivity.java:223)
at bluetooth.arduino.ndroid.bluetooth3.MainActivity$2.handleMessage(MainActivity.java:74)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5763)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
这是Java代码：
public class MainActivity extends AppCompatActivity {
private MediaPlayer TheSound;
private static final String TAG = "bluetooth2";
TextView txtArduino;
Handler h;
final int RECIEVE_MESSAGE = 1; // Status for Handler
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private StringBuilder sb = new StringBuilder();
private ConnectedThread mConnectedThread;
// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// MAC-address of Bluetooth module (you must edit this line)
private static String address = "98:D3:31:F9:4C:52";
private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer TheSound) {
releaseMediaPlayer();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtArduino = (TextView) findViewById(R.id.txtArduino); // for display the received data from the Arduino
h = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case RECIEVE_MESSAGE: // if receive massage
byte[] readBuf = (byte[]) msg.obj;
String strIncom = new String(readBuf, 0, msg.arg1); // create string from bytes array
sb.append(strIncom); // append string
int endOfLineIndex = sb.indexOf("\r\n"); // determine the end-of-line
if (endOfLineIndex > 0) { // if end-of-line,
String sbprint = sb.substring(0, endOfLineIndex); // extract string
sb.delete(0, sb.length()); // and clear
Toast.makeText(getBaseContext(), "the connection has set up ", Toast.LENGTH_LONG).show();
malek(sbprint);
}
//Log.d(TAG, "...String:"+ sb.toString() + "Byte:" + msg.arg1 + "...");
break;
}
}
;
};
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
checkBTState();
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if (Build.VERSION.SDK_INT >= 10) {
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[]{UUID.class});
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection", e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
@Override
public void onResume() {
super.onResume();
Log.d(TAG, "...onResume - try connect...");
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
// Two things are needed to make a connection:
// A MAC address, which we got above.
// A Service ID or UUID. In this case we are using the
// UUID for SPP.
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
}
// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();
// Establish the connection. This will block until it connects.
Log.d(TAG, "...Connecting...");
try {
btSocket.connect();
Log.d(TAG, "....Connection ok...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
// Create a data stream so we can talk to server.
Log.d(TAG, "...Create Socket...");
mConnectedThread = new ConnectedThread(btSocket);
mConnectedThread.start();
}
@Override
public void onPause() {
super.onPause();
Log.d(TAG, "...In onPause()...");
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
}
}
private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if (btAdapter == null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
private void errorExit(String title, String message) {
Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
finish();
}
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[256]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer); // Get number of bytes and message in "buffer"
h.obtainMessage(RECIEVE_MESSAGE, bytes, -1, buffer).sendToTarget(); // Send to message queue Handler
} catch (IOException e) {
break;
}
}
}
}
// determent the voice clip and update TextView
public void malek (String sbprint){
releaseMediaPlayer();
TheSound = MediaPlayer.create(this,mmalek(sbprint));
TheSound.start();
// I created a global var for when TheSound is finished , releas the resources
TheSound.setOnCompletionListener(mCompletionListener);
}
// determent which voice clip to play
public int mmalek (String theX ){
txtArduino.setText(theX); // update TextView
if(theX.equals("1")){
Toast.makeText(getBaseContext(), " hello", Toast.LENGTH_LONG).show();
return R.raw.the;}
if(theX.equals("2")){
Toast.makeText(getBaseContext(), " it's me", Toast.LENGTH_LONG).show();
return R.raw.its_me;
}
return 0;}
/**
* Clean up the media player by releasing its resources.
*/
private void releaseMediaPlayer() {
// If the media player is not null, then it may be currently playing a sound.
if (TheSound != null) {
// Regardless of the current state of the media player, release its resources
// because we no longer need it.
TheSound.release();
// Set the media player back to null. For our code, we've decided that
// setting the media player to null is an easy way to tell that the media player
// is not configured to play an audio file at the moment.
TheSound = null;
}
}
}