我想让Android设备的麦克风之间的流声音到另一个的扬声器，所以我使用了Audiorecord !!
发送语音的活动是：
public class MainActivity extends Activity {
AudioRecord recorder;
private int sampleRate = 44100;
int minBufSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);
private boolean status = true;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startButton.setOnClickListener (startListener);
stopButton.setOnClickListener (stopListener);
minBufSize += 4096;
System.out.println("minBufSize: " + minBufSize);
}
private final OnClickListener stopListener = new OnClickListener() {
@Override
public void onClick(View arg0) {
status = false;
recorder.release();
}
};
private final OnClickListener startListener = new OnClickListener() {
@Override
public void onClick(View arg0) {
status = true;
try {
DatagramSocket socket = new DatagramSocket();
Log.d("VS", "Socket Created");
byte[] buffer = new byte[minBufSize];
Log.d("VS","Buffer created of size " + minBufSize);
DatagramPacket packet;
final InetAddress destination = InetAddress.getByName("addresse");
Log.d("VS", "Address retrieved");
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,sampleRate,channelConfig,audioFormat,minBufSize*10);
Log.d("VS", "Recorder initialized");
recorder.startRecording();
while(status == true) {
//reading data from MIC into buffer
minBufSize = recorder.read(buffer, 0, buffer.length);
//putting buffer in the packet
packet = new DatagramPacket (buffer,buffer.length,destination,port);
socket.send(packet);
System.out.println("MinBufferSize: " +minBufSize);
}
} catch(UnknownHostException e) {
Log.e("VS", "UnknownHostException");
} catch (IOException e) {
e.printStackTrace();
Log.e("VS", "IOException");
}
}
};
}
并且android安装中的活动是：
public class MainActivity extends Activity {
public static DatagramSocket socket;
private AudioTrack speaker;
private boolean status = true;
@SuppressLint("CutPasteId")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button1 = (Button) findViewById(R.id.receive_button);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
status = true;
try {
DatagramSocket socket = new DatagramSocket(port);
byte[] buffer = new byte[4096];
//minimum buffer size. need to be careful. might cause problems. try setting manually if any problems faced
int minBufSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);
speaker = new AudioTrack(AudioManager.STREAM_MUSIC,sampleRate,channelConfig,audioFormat,minBufSize,AudioTrack.MODE_STREAM);
speaker.play();
while(status == true) {
DatagramPacket packet = new DatagramPacket(buffer,buffer.length);
socket.receive(packet);
Log.d("VR", "Packet Received");
buffer=packet.getData();
Log.d("VR", "Packet data read into buffer");
speaker.write(buffer, 0, minBufSize);
Log.d("VR", "Writing buffer content to speaker");
}
} catch(UnknownHostException e) {
Log.e("VS", "UnknownHostException");
} catch (IOException e) {
e.printStackTrace();
Log.e("VS", "IOException");
}
}
});
Button button2 = (Button) findViewById(R.id.receive_button);
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
status = false;
speaker.release();
}
});
}
}
发件人工作但是当我点击接收器应用程序中的按钮时，会出错：NULL POINTER EXCEPTION !! 我该如何解决这个问题？
谢谢！