How to send file from Android device to other device through Bluetooth by code

问题

I want to develop application that sends image/txt or any file from one android device to another none android device using Bluetooth.

Please anyone can give help or source code for that?

回答1:

Here is the code from which you can send file via bluetooth from android device to any device.

btnOk.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v) 
            {
                txtContent = (EditText)findViewById(R.id.txtContent);
                imageView = (ImageView)findViewById(R.id.imageView);
                linearLayout = (LinearLayout)findViewById(R.id.linearLayout);

                viewToBeConverted = (TextView) findViewById(R.id.hello);
                linearLayout.setDrawingCacheEnabled(true);

                //Toast.makeText(MainActivity.this, file.toString(), Toast.LENGTH_LONG).show();
                try
                {
                    if(file.exists())
                    {
                        file.delete();
                    }
                    out = new FileOutputStream(file);
                }
                catch (Exception e) 
                {
                    Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
                }


                viewToBeConverted.setText(txtContent.getText().toString());
                viewToBeConverted.setDrawingCacheEnabled(true);

               // Toast.makeText(MainActivity.this, " " + viewToBeConverted.getDrawingCache(), Toast.LENGTH_LONG).show();
                txtContent.setText("");

                Bitmap viewBitmap = linearLayout.getDrawingCache();


                linearLayout.setVisibility(1);
                imageView.setImageBitmap(viewBitmap);

                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                viewBitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); //bm is the bitmap object

                byte[] b = baos.toByteArray();  

                try 
                {

                    out.write(b);
                    out.flush();
                    out.close();

                    Intent intent = new Intent();  
                    intent.setAction(Intent.ACTION_SEND);  
                    intent.setType("image/png");
                    intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file) );  
                    startActivity(intent);
                }
                catch (Exception e) 
                {
                    Toast.makeText(MainActivity.this, " " + e.getMessage(), Toast.LENGTH_LONG).show();

                }
            }
        });

Enjoy. :)

回答2:

This application allows two Android devices to carry out two-way text chat over Bluetooth. It demonstrates all the fundamental Bluetooth API capabilites, such as:

• Scanning for other Bluetooth devices
• Querying the local Bluetooth adapter for paired Bluetooth devices
• Establishing RFCOMM channels/sockets
• Connecting to a remote device
• Transfering data over Bluetooth

http://developer.android.com/resources/samples/BluetoothChat/index.html

来源：https://stackoverflow.com/questions/6227498/how-to-send-file-from-android-device-to-other-device-through-bluetooth-by-code