I am building an application that is used to control a robot via bluetooth. I have a problem of connecting my app with the bluetooth module. Whenever, I open the app, it crashes.
Explanation of the app:
* The app contains 3 main fragments:
1) 2 Fragment that has buttons and used to send data to the bluetooth module
2) 1 Fragment that receive data from the bluetooth module and display data on the android app
* I created a bluetooth communication class that is quite similar to: http://developer.android.com/guide/topics/connectivity/bluetooth.html
* I called onResume and onPause on each fragmet but that didn't work.
Can someone please help me fix the code? I will post the code, no worries
Code:
Fragment 1:
Fragment 2:
Fragment 3:
Tab Page Adapter:
Bluetooth Communication Class:
Main Activity:
Android Manefist:
Explanation of the app:
* The app contains 3 main fragments:
1) 2 Fragment that has buttons and used to send data to the bluetooth module
2) 1 Fragment that receive data from the bluetooth module and display data on the android app
* I created a bluetooth communication class that is quite similar to: http://developer.android.com/guide/topics/connectivity/bluetooth.html
* I called onResume and onPause on each fragmet but that didn't work.
Can someone please help me fix the code? I will post the code, no worries
Code:
Fragment 1:
Java:
package com.example.ibm.exoskeleton_2;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothSocket;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import java.io.IOException;
public class ExtraExercise extends Fragment {
Button start4,start5,start6,start7;
Button play4,play5,play6,play7;
Button stop4,stop5,stop6,stop7;
BluetoothCommunication BC = new BluetoothCommunication();
BluetoothCommunication.ConnectedThread mConnectedThread;
BluetoothAdapter btAdapter = BC.getBtAdapter();
BluetoothSocket btSocket = BC.getBtSocket();
@override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
BC.btAdapter.enable();
try {
BC.btSocket.connect();
} catch (IOException e) {
e.printStackTrace();
}
View rootView = inflater.inflate(R.layout.extraxercise, container, false);
start4 = (Button) rootView.findViewById(R.id.Start4Button);
start5 = (Button) rootView.findViewById(R.id.Start5Button);
start6 = (Button) rootView.findViewById(R.id.Start6Button);
start7 = (Button) rootView.findViewById(R.id.Start7Button);
play4 = (Button) rootView.findViewById(R.id.Video4Button);
play5 = (Button) rootView.findViewById(R.id.Video5Button);
play6 = (Button) rootView.findViewById(R.id.Video6Button);
play7 = (Button) rootView.findViewById(R.id.Video7Button);
stop4 = (Button) rootView.findViewById(R.id.Stop4Button);
stop5 = (Button) rootView.findViewById(R.id.Stop5Button);
stop6 = (Button) rootView.findViewById(R.id.Stop6Button);
stop7 = (Button) rootView.findViewById(R.id.Stop7Button);
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
BC.checkBTState();
start4.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
start4.setEnabled(true);
mConnectedThread.write("4"); // Send "4" via Bluetooth
}
});
start5.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
start5.setEnabled(true);
mConnectedThread.write("5"); // Send "4" via Bluetooth
}
});
start6.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
start6.setEnabled(true);
mConnectedThread.write("6"); // Send "4" via Bluetooth
}
});
start7.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
start7.setEnabled(true);
mConnectedThread.write("7"); // Send "4" via Bluetooth
}
});
stop4.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
stop4.setEnabled(true);
mConnectedThread.write("0"); // Send "4" via Bluetooth
}
});
stop5.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
stop5.setEnabled(true);
mConnectedThread.write("0"); // Send "4" via Bluetooth
}
});
stop6.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
stop6.setEnabled(true);
mConnectedThread.write("0"); // Send "4" via Bluetooth
}
});
stop7.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
stop7.setEnabled(true);
mConnectedThread.write("0"); // Send "4" via Bluetooth
}
});
return rootView;
}
}
Java:
package com.example.ibm.exoskeleton_2;
import android.bluetooth.BluetoothAdapter;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import java.io.IOException;
/**
* Created by IBM on 07-Apr-15.
*/
public class MainPage extends Fragment {
Button start1,start2,start3;
Button play1,play2,play3;
Button stop1,stop2,stop3;
Button tour;
BluetoothCommunication BC = new BluetoothCommunication();
BluetoothCommunication.ConnectedThread mConnectedThread;
BluetoothAdapter btAdapter = BC.getBtAdapter();
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
BC.btAdapter.enable();
try {
BC.btSocket.connect();
} catch (IOException e) {
e.printStackTrace();
}
View rootView = inflater.inflate(R.layout.main_page, container, false);
start1 = (Button) rootView.findViewById(R.id.Start1Button);
start2 = (Button) rootView.findViewById(R.id.Start2Button);
start3 = (Button) rootView.findViewById(R.id.Start3Button);
play1 = (Button) rootView.findViewById(R.id.Video1Button);
play2 = (Button) rootView.findViewById(R.id.Video2Button);
play3 = (Button) rootView.findViewById(R.id.Video3Button);
stop1 = (Button) rootView.findViewById(R.id.Stop1Button);
stop2 = (Button) rootView.findViewById(R.id.Stop2Button);
stop3 = (Button) rootView.findViewById(R.id.Stop3Button);
tour = (Button) rootView.findViewById(R.id.TourButton);
return rootView;
}
public class ControllerFragment extends Fragment implements View.OnClickListener {
@override
public void onClick(View v) {
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
BC.checkBTState();
start1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
start1.setEnabled(true);
mConnectedThread.write("1"); // Send "4" via Bluetooth
}
});
start2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
start2.setEnabled(true);
mConnectedThread.write("2"); // Send "4" via Bluetooth
}
});
start3.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
start3.setEnabled(true);
mConnectedThread.write("3"); // Send "4" via Bluetooth
}
});
stop1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
stop1.setEnabled(true);
mConnectedThread.write("0"); // Send "4" via Bluetooth
}
});
stop2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
stop2.setEnabled(true);
mConnectedThread.write("0"); // Send "4" via Bluetooth
}
});
stop3.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
stop3.setEnabled(true);
mConnectedThread.write("0"); // Send "4" via Bluetooth
}
});
}
}
}
Java:
package com.example.ibm.exoskeleton_2;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothSocket;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import java.io.IOException;
import java.io.InputStream;
/**
* Created by IBM on 07-Apr-15.
*/
public class OnYourOwn extends android.support.v4.app.Fragment {
EditText thumb,index,middle,ring,pinky;
Handler h;
final int RECIEVE_MESSAGE = 1; // Status for Handler
private StringBuilder sb = new StringBuilder();
static int check = 1;
BluetoothCommunication BC = new BluetoothCommunication();
BluetoothCommunication.ConnectedThread mConnectedThread;
BluetoothAdapter btAdapter = BC.getBtAdapter();
BluetoothSocket btSocket = BC.getBtSocket();
// Get the input and output streams, using temp objects because
// member streams are final
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
BC.btAdapter.enable();
try {
BC.btSocket.connect();
} catch (IOException e) {
e.printStackTrace();
}
View rootView = inflater.inflate(R.layout.try_your_own, container, false);
thumb = (EditText) rootView.findViewById(R.id.ThumbText);
index = (EditText) rootView.findViewById(R.id.IndexText);
middle = (EditText) rootView.findViewById(R.id.MiddleText);
ring = (EditText) rootView.findViewById(R.id.RingText);
pinky = (EditText) rootView.findViewById(R.id.PinkyText);
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
if (check == 1)
thumb.setText(sbprint); // update thumb
else if (check == 2)
index.setText(sbprint);
else if (check == 3)
middle.setText(sbprint);
else if (check == 4)
ring.setText(sbprint);
else
pinky.setText(sbprint);
}
// Log.d(TAG, "...String:"+ sb.toString() + "Byte:" + msg.arg1 + "...");
break;
}
};
};
return rootView;
}
public class ControllerFragment extends android.support.v4.app.Fragment {
public void onClick(View v) {
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
BC.checkBTState();
}
}
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
public ConnectedThread(BluetoothSocket socket) {
InputStream tmpIn = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
} catch (IOException e) {
}
mmInStream = tmpIn;
}
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;
}
}
}
}
}
Java:
package com.example.ibm.exoskeleton_2;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothSocket;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import java.io.IOException;
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
@override
public Fragment getItem(int index) {
switch (index) {
case 1:
return new MainPage();
case 0:
return new ExtraExercise();
case 2:
return new OnYourOwn();
}
return null;
}
@override
public int getCount() {
// get item count - equal to number of tabs
return 3;
}
}
Java:
package com.example.ibm.exoskeleton_2;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io_OutputStream;
import java.lang.reflect.Method;
import java.util.UUID;
/**
* Created by IBM on 07-Apr-15.
*/
public class BluetoothCommunication extends Fragment {
public static final String TAG = "bluetooth2";
public ConnectedThread mConnectedThread;
public BluetoothAdapter btAdapter = null;
public BluetoothSocket btSocket = null;
// SPP UUID service
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// MAC-address of Bluetooth module (you must edit this line)
public static String address = "00:06:66:68:30:D6";
public 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() + ".");
}
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} 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() + ".");
}
}
public 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);
}
}
}
public void errorExit(String title, String message){
Toast.makeText(getActivity(), title + " - " + message, Toast.LENGTH_LONG).show();
getActivity().finish();
}
public class ConnectedThread extends Thread {
public final InputStream mmInStream;
public 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 write(String message) {
Log.d(TAG, "...Data to send: " + message + "...");
byte[] msgBuffer = message.getBytes();
try {
mmOutStream.write(msgBuffer);
} catch (IOException e) {
Log.d(TAG, "...Error data send: " + e.getMessage() + "...");
}
}
}
public BluetoothAdapter getBtAdapter()
{
return btAdapter;
}
public BluetoothSocket getBtSocket ()
{
return btSocket;
}
}
Java:
package com.example.ibm.exoskeleton_2;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothSocket;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import java.io.IOException;
public class MainActivity extends ActionBarActivity implements
ActionBar.TabListener, android.support.v7.app.ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private android.support.v7.app.ActionBar actionBar;
private String[] tabs = { "Extra", "Main", "Readings" };
// Tab titles
BluetoothCommunication BC = new BluetoothCommunication();
BluetoothCommunication.ConnectedThread mConnectedThread;
BluetoothAdapter btAdapter = BC.getBtAdapter();
BluetoothSocket btSocket = BC.getBtSocket();
@override
protected void onCreate(Bundle savedInstanceState) {
BC.btAdapter.enable();
try {
BC.btSocket.connect();
} catch (IOException e) {
e.printStackTrace();
}
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initilization
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getSupportActionBar();
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
}
@override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@override
public void onPageScrollStateChanged(int arg0) {
}
});
}
@override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
@override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// on tab selected
// show respected fragment view
viewPager.setCurrentItem(tab.getPosition());
}
@override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
@override
public void onTabSelected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction fragmentTransaction) {
viewPager.setCurrentItem(tab.getPosition());
}
@override
public void onTabUnselected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction fragmentTransaction) {
}
@override
public void onTabReselected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction fragmentTransaction) {
}
}
Java:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="[URL]http://schemas.android.com/apk/res/android[/URL]"
package="com.example.ibm.exoskeleton_2" >
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<application
android:allowBackup="true"
android:icon="@Mipmap/ic_launcher"
android:label="@String/app_name"
android:theme="@Style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@String/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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