如何发送/接收视频文件（通过Bluetooth聊天示例代码使用）？
使用Bluetooth SDK提供的Android聊天示例，我可以在配对设备之间发送消息，但是当我尝试使用相同的输入和输出流发送视频文件时，这表明无效标头错误。
我正在使用以下代码：
ChatService.java
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
tmpIn = SocketHolder.getBluetoothSocket().getInputStream();
tmpOut = SocketHolder.getBluetoothSocket().getOutputStream();
//SocketHolder.setInputStream();
// SocketHolder.setOutputStream();
} catch (Exception e) {
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(ChatActivity.MESSAGE_READ, bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
connectionLost();
break;
}
}
}
/**
* Write to the connected OutStream.
*
* @param buffer The bytes to write
*/
public void write(byte[] buffer) {
System.out.println("writing video to receiver");
try {
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(ChatActivity.MESSAGE_WRITE, -1, -1, buffer)
.sendToTarget();
} catch (IOException e) {
System.out.println("exception in writing:" + e.getMessage());
}
System.out.println("exiting write Byte[]");
}
FileReceiver.java
package com.example.bluetoothrecorder.java_codegeeks_approach.utils;
import android.content.Context;
import android.content.ContextWrapper;
import android.os.AsyncTask;
import android.os.Environment;
import android.util.Log;
import com.example.bluetoothrecorder.recording.RecorderActivity;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
public class FileReceiverTask extends AsyncTask {
private static final String TAG = "===FileReceiverTask";
InputStream inputStream;
TaskUpdate taskUpdate;
MetaData metaData;
//String filePath;
public FileReceiverTask(TaskUpdate taskUpdate) {
Log.d(FileReceiverTask.TAG,"Object created");
this.taskUpdate = taskUpdate;
try {
Log.d(FileReceiverTask.TAG,"trying to get inputStream");
inputStream = SocketHolder.getBluetoothSocket().getInputStream();
Log.d(FileReceiverTask.TAG,"obtained inputStream");
} catch (Exception e) {
Log.d(FileReceiverTask.TAG,"Failed to obtain input stream");
Log.d(FileReceiverTask.TAG,e.toString());
}
}
@Override
protected Object doInBackground(Object[] objects) {
taskUpdate.TaskStarted();
if(!SocketHolder.getBluetoothSocket().isConnected()) {
Log.d(FileReceiverTask.TAG,"Socket is closed... Can't perform file receiving Task...");
return null;
}
try {
ObjectInputStream objectInputStream = new ObjectInputStream(inputStream);
metaData = (MetaData)objectInputStream.readObject();
Log.d(FileReceiverTask.TAG," Variable value received : " + metaData.toString() );
//objectInputStream.close();
File file= getFileName(metaData.getFname());
if(!file.exists()) {
Log.d(FileReceiverTask.TAG, "File does not exist : " + file.getPath());
} else {
Log.d(FileReceiverTask.TAG,"File already exists : " + file.getPath());
}
OutputStream outputStreamWriteToFile = new FileOutputStream(file);
Log.d(FileReceiverTask.TAG,"outputStreamWriteToFile created");
byte[] buffer = new byte[1024];
int read;
long totalRead = 0;
long toRead = metaData.getDataSize();
int loop = 0;
if(! SocketHolder.getBluetoothSocket().isConnected()) {
Log.d(FileReceiverTask.TAG,"Socket is closed... Can't perform file receiving from stream...");
return null;
}
while ((read = inputStream.read(buffer)) != -1) {
totalRead = totalRead + read;
outputStreamWriteToFile.write(buffer,0,read);
loop++;
//Log.d(FileReceiverTask.TAG,"loop iterations : " + loop + " bytes read: " + totalRead);
if(totalRead % 1024 == 0) {
taskUpdate.TaskProgressPublish(metaData.getFname() + String.valueOf((float)totalRead/toRead*100) + "%");
}
//This the most important part...
if(totalRead == metaData.getDataSize()) {
Log.d(FileReceiverTask.TAG,"breaking from loop");
break;
}
}
Log.d(FileReceiverTask.TAG,"loop iterations : " + loop + " bytes read: " + totalRead);
Log.d(FileReceiverTask.TAG,"outputStreamWriteToFile closing");
outputStreamWriteToFile.close();
Log.d(FileReceiverTask.TAG,"outputStreamWriteToFile closed");
} catch (IOException e) {
e.printStackTrace();
Log.d(FileReceiverTask.TAG,e.toString() );
taskUpdate.TaskError(e.toString());
} catch (ClassNotFoundException e) {
e.printStackTrace();
Log.d(FileReceiverTask.TAG,e.toString() );
taskUpdate.TaskError(e.toString());
}
return null;
}
@Override
protected void onPostExecute(Object o) {
super.onPostExecute(o);
taskUpdate.TaskCompleted(metaData.getFname());
if(SocketHolder.getBluetoothSocket().isConnected()) {
Log.d(FileReceiverTask.TAG,"BluetoothSocket is connected");
} else {
Log.d(FileReceiverTask.TAG,"BluetoothSocket is ****NOT*** connected");
}
Log.d(FileReceiverTask.TAG,"Task execution completed");
}
public static File getFileName( String fileName) {
File dir = new File(Environment.getExternalStorageDirectory(),"Koya");
try{
if(dir.mkdir()) {
System.out.println("Directory created");
} else {
System.out.println("Directory is not created");
}
}catch(Exception e){
e.printStackTrace();
}
return new File(dir.getPath(),fileName);
}
}
和FileSenderTask.java
package com.example.bluetoothrecorder.java_codegeeks_approach.utils;
import android.bluetooth.BluetoothSocket;
import android.os.AsyncTask;
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
public class FileSenderTask extends AsyncTask {
private static final String TAG = "===FileSenderTask";
OutputStream outputStream;
String filePath;
BluetoothSocket bluetoothSocket;
TaskUpdate taskUpdate;
MetaData metaData;
public FileSenderTask(String path, TaskUpdate taskUpdate) {
Log.d(FileSenderTask.TAG,"Object created");
this.taskUpdate = taskUpdate;
this.bluetoothSocket = SocketHolder.getBluetoothSocket();
this.filePath = path;
try {
this.outputStream = bluetoothSocket.getOutputStream();
Log.d(FileSenderTask.TAG,"obtained outputStream");
} catch (IOException e) {
e.printStackTrace();
Log.d(FileSenderTask.TAG,"Failed to obtain outputStream");
Log.d(FileSenderTask.TAG,e.toString());
}
}
@Override
protected Object doInBackground(Object[] objects) {
taskUpdate.TaskStarted();
if(!SocketHolder.getBluetoothSocket().isConnected()) {
Log.d(FileSenderTask.TAG,"Socket is closed... Can't perform file sending Task...");
return null;
}
//Receive metaData
try {
Log.d(FileSenderTask.TAG,"obtain file object for : "+ filePath);
File file = new File(filePath);
if(!file.exists()) {
Log.d(FileSenderTask.TAG,"File does not exist");
return null ;
} else {
Log.d(FileSenderTask.TAG,"File exists");
}
ObjectOutputStream objectOutputStream;
objectOutputStream = new ObjectOutputStream(outputStream);
metaData = new MetaData(file.length(),file.getName());
Log.d(FileSenderTask.TAG,"Trying to send : " + metaData.toString());
objectOutputStream.writeObject(metaData);
if(!SocketHolder.getBluetoothSocket().isConnected()) {
Log.d(FileSenderTask.TAG,"Socket is closed... Can't perform file sending on stream...");
return null;
}
Log.d(FileSenderTask.TAG,"fileInputStream open: "+ filePath);
FileInputStream fileInputStream = new FileInputStream(file);
int bytesRead = 0;
byte[] buffer = new byte[1024];
int loop = 0;
long totalRead = 0;
long toRead = metaData.getDataSize();
while ((bytesRead = fileInputStream.read(buffer)) > 0)
{
loop++;
outputStream.write(buffer, 0, bytesRead);
totalRead = totalRead + bytesRead;
if(totalRead % 1024 == 0) {
taskUpdate.TaskProgressPublish(metaData.getFname() + String.valueOf((float)totalRead/toRead*100) + "%");
}
}
Log.d(FileSenderTask.TAG,"Loop iterations run : " + loop);
Log.d(FileSenderTask.TAG,"trying to close the fileInputStream...");
fileInputStream.close();
} catch (IOException e) {
e.printStackTrace();
Log.d(FileSenderTask.TAG,e.toString());
taskUpdate.TaskError(e.toString());
} catch (Exception e) {
taskUpdate.TaskError(e.toString());
}
return null;
}
@Override
protected void onPostExecute(Object o) {
super.onPostExecute(o);
taskUpdate.TaskCompleted(metaData.getFname());
if(SocketHolder.getBluetoothSocket().isConnected()) {
Log.d(FileSenderTask.TAG,"BluetoothSocket is connected");
} else {
Log.d(FileSenderTask.TAG,"BluetoothSocket is ****NOT*** connected");
}
Log.d(FileSenderTask.TAG,"Task execution completed");
}
}
谢谢。