Development of mobile phone and MCU via Bluetooth module

1.xml Layout file

<?xml version= "1.0" encoding= "Utf-8"?>
<android.support.constraint.constraintlayout xmlns:app= "Http://schemas.android.com/apk/res-auto"
Xmlns:tools= "Http://schemas.android.com/tools"
Android:id= "@+id/widget0"
Android:layout_width= "Fill_parent"
android:layout_height= "Fill_parent"
Xmlns:android= "Http://schemas.android.com/apk/res/android"
tools:layout_editor_absolutey= "81DP"
tools:layout_editor_absolutex= "0DP" >

<button
Android:id= "@+id/btnf"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:text= "Forward"
Tools:layout_constrainttop_creator= "1"
Tools:layout_constraintright_creator= "1"
app:layout_constraintright_torightof= "Parent"
android:layout_margintop= "119DP"
Tools:layout_constraintleft_creator= "1"
app:layout_constraintleft_toleftof= "Parent"
app:layout_constrainttop_totopof= "Parent" ></Button>

<button
Android:id= "@+id/btnl"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:layout_marginstart= "16DP"
Android:text= "left"
app:layout_constraintbaseline_tobaselineof= "@+id/btns"
Tools:layout_constraintbaseline_creator= "1"
Tools:layout_constraintleft_creator= "1"
app:layout_constraintleft_toleftof= "Parent"
android:layout_marginleft= "16DP" ></Button>

<button
Android:id= "@+id/btnr"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:text= "Turn Right"
Tools:layout_constraintright_creator= "1"
Android:layout_marginend= "6DP"
app:layout_constraintright_torightof= "Parent"
app:layout_constraintbaseline_tobaselineof= "@+id/btns"
Tools:layout_constraintbaseline_creator= "1"
android:layout_marginright= "6DP" ></Button>

<button
Android:id= "@+id/btnb"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:text= "Back"
Tools:layout_constrainttop_creator= "1"
Tools:layout_constraintright_creator= "1"
app:layout_constraintright_torightof= "@+id/btns"
android:layout_margintop= "58DP"
app:layout_constrainttop_tobottomof= "@+id/btns"
Tools:layout_constraintleft_creator= "1"
app:layout_constraintleft_toleftof= "@+id/btns" ></Button>

<button
Android:id= "@+id/btns"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:text= "Stop"
Tools:layout_constrainttop_creator= "1"
Tools:layout_constraintright_creator= "1"
app:layout_constraintright_torightof= "@+id/btnf"
android:layout_margintop= "64DP"
app:layout_constrainttop_tobottomof= "@+id/btnf"
Tools:layout_constraintleft_creator= "1"
app:layout_constraintleft_toleftof= "@+id/btnf" ></Button>
</android.support.constraint.ConstraintLayout>

2.MainActivity

Package com.example.administrator.bluetooth_cmd;

Import Android.bluetooth.BluetoothAdapter;
Import Android.bluetooth.BluetoothDevice;
Import Android.bluetooth.BluetoothSocket;
Import Android.os.Bundle;
Import android.support.v7.app.AppCompatActivity;
Import Android.util.Log;
Import android.view.MotionEvent;
Import Android.view.View;
Import Android.widget.Button;
Import Android.widget.Toast;

Import java.io.IOException;
Import Java.io.OutputStream;
Import Java.util.UUID;
public class Mainactivity extends Appcompatactivity {
private static final String TAG = "Thinbtclient";

Private static Final Boolean D = true;

Private Bluetoothadapter mbluetoothadapter = null;

Private Bluetoothsocket btsocket = null; The socket between the Bluetooth and Bluetooth modules on your phone

Private OutputStream outstream = null; Output stream of the send instruction
Button mbuttonf;


Button mbuttonb;
Button mbuttonl;
Button Mbuttonr;
Button mbuttons;

private static final UUID My_uuid = uuid.fromstring ("00001101-0000-1000-8000-00805F9B34FB");


private static String address = "00:0c:bf:09:4a:4a"; <== the MAC address of the Bluetooth device you want to connect to


/** called when the activity is first created. */

@Override

public void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);
Setcontentview (R.layout.activity_main);
Mbluetoothadapter = Bluetoothadapter.getdefaultadapter ();

Btn_function ();
Init_bluetooth ();
}
private void Btn_function () {
Forward
mbuttonf = (Button) Findviewbyid (R.ID.BTNF);
Mbuttonf.setontouchlistener (New Button.ontouchlistener () {

@Override
public boolean OnTouch (View V, motionevent event) {
TODO auto-generated Method Stub
String message;
Byte[] Msgbuffer;
int action = Event.getaction ();
Switch (action) {
Case Motionevent.action_down://Press the Forward button
try {
OutStream = Btsocket.getoutputstream (); Get the output stream through the socket

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


message = "1"; The upper computer and the lower machine agreed to the instruction 1 means forward

Msgbuffer = Message.getbytes (); Because OutputStream can only transmit bytes, the string instruction programming byte stream

try {
Outstream.write (Msgbuffer); Writes the instruction to the output stream. Which is written in the socket.

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
Break

Case MOTIONEVENT.ACTION_UP://Release the Forward button, similar to the previous, just different instructions.
try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


Message = "0";

Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
Break
}
return false;
}


});
Back off
MBUTTONB = (Button) Findviewbyid (R.ID.BTNB);
Mbuttonb.setontouchlistener (New Button.ontouchlistener () {


@Override
public boolean OnTouch (View V, motionevent event) {
TODO auto-generated Method Stub
String message;
Byte[] Msgbuffer;
int action = Event.getaction ();
Switch (action) {
Case Motionevent.action_down:
try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


Message = "3";

Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
Break

Case MOTIONEVENT.ACTION_UP:
try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


Message = "0";

Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
Break
}

return false;
}


});
Left
Mbuttonl = (Button) Findviewbyid (R.ID.BTNL);
Mbuttonl.setontouchlistener (New Button.ontouchlistener () {

@Override
public boolean OnTouch (View V, motionevent event) {
TODO auto-generated Method Stub
String message;
Byte[] Msgbuffer;
int action = Event.getaction ();
Switch (action) {
Case Motionevent.action_down:
try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


Message = "2";

Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
Break

Case MOTIONEVENT.ACTION_UP:
try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


Message = "0";

Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
Break
}

return false;

}
});
Turn right
Mbuttonr = (Button) Findviewbyid (R.ID.BTNR);
Mbuttonr.setontouchlistener (New Button.ontouchlistener () {

@Override
public boolean OnTouch (View V, motionevent event) {
TODO auto-generated Method Stub
String message;
Byte[] Msgbuffer;
int action = Event.getaction ();
Switch (action) {
Case Motionevent.action_down:
try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


Message = "4";

Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
Break

Case MOTIONEVENT.ACTION_UP:
try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


Message = "0";

Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
Break
}

return false;

}


});

Stop it
Mbuttons = (Button) Findviewbyid (R.ID.BTNS);
Mbuttons.setontouchlistener (New Button.ontouchlistener () {

@Override
public boolean OnTouch (View V, motionevent event) {
TODO auto-generated Method Stub
if (event.getaction () = = Motionevent.action_down)
try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


String message = "0";

byte[] Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
return false;
}

});
}
private void Init_bluetooth ()
{
if (D) log.e (TAG, "+ + + on CREATE + + +");

Mbluetoothadapter = Bluetoothadapter.getdefaultadapter ();

if (Mbluetoothadapter = = null) {
Toast.maketext (This, "Bluetooth was not available.", Toast.length_long). Show ();
Finish ();
Return
}


if (!mbluetoothadapter.isenabled ()) {
Toast.maketext (This, "* * Enable your Bluetooth and re-run this program.", Toast.length_long). Show ();
Finish ();
Return

}


if (D)
LOG.E (TAG, "+ + + do in on CREATE, GOT LOCAL BT ADAPTER + + + + +");

}


@Override

public void OnStart () {

Super.onstart ();

if (D) log.e (TAG, "+ + on START + +");
}


@Override

public void Onresume () {

Super.onresume ();
if (D) {
LOG.E (TAG, "+ on RESUME +");
LOG.E (TAG, "+ About to attempt CLIENT CONNECT +");

}

Bluetoothdevice device = Mbluetoothadapter.getremotedevice (address);

try {

Btsocket = Device.createrfcommsockettoservicerecord (My_uuid);

} catch (IOException e) {

LOG.E (TAG, "on Resume:socket creation failed.", e);

}
Mbluetoothadapter.canceldiscovery ();
try {

Btsocket.connect ();

LOG.E (TAG, "on RESUME:BT connection established, data transfer link open.");

} catch (IOException e) {

try {
Btsocket.close ();

} catch (IOException E2) {

Log. E (TAG, "on resume:unable to close socket during connection failure", E2);
}

}


Create A data stream so we can talk to server.

if (D)
LOG.E (TAG, "+ about-SAY SOMETHING to SERVER +");
/* Try {
OutStream = Btsocket.getoutputstream ();

} catch (IOException e) {
LOG.E (TAG, "on Resume:output stream creation failed.", e);
}


String message = "1";

byte[] Msgbuffer = Message.getbytes ();

try {
Outstream.write (Msgbuffer);

} catch (IOException e) {
LOG.E (TAG, "on resume:exception during write.", e);
}
*/

}


@Override

public void OnPause () {

Super.onpause ();


if (D)
LOG.E (TAG, "-on PAUSE-");
if (OutStream! = null) {
try {
Outstream.flush ();
} catch (IOException e) {
LOG.E (TAG, "on pause:couldn ' t flush output stream.", e);
}

}


try {
Btsocket.close ();
} catch (IOException E2) {
LOG.E (TAG, "on pause:unable to close socket.", E2);
}

}


@Override

public void OnStop () {

Super.onstop ();

if (D) log.e (TAG, "--on STOP--");

}


@Override

public void OnDestroy () {

Super.ondestroy ();

if (D) log.e (TAG, "---on DESTROY---");

}
}
3. Modify Phone Permissionsmanifest. XML

<uses-permission android:name= "Android.permission.BLUETOOTH"/>

<uses-permission android:name= "Android.permission.BLUETOOTH_ADMIN"/>

4. Effects

Development of mobile phone and MCU via Bluetooth module