Otimização da gestão da ligação do bluetooth do dispositivo

app/src/main/AndroidManifest.xml

@@ -7,6 +7,8 @@
 
     <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
 
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"

app/src/main/java/pt/epvc/lazzycofee/MainActivity.java

@@ -1,5 +1,6 @@
 package pt.epvc.lazzycofee;
 
+import android.Manifest;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.BluetoothSocket;
@@ -8,6 +9,7 @@ import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.SystemClock;
+import android.util.Log;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.AdapterView;
@@ -35,21 +37,12 @@ import java.util.UUID;
 
 public class MainActivity extends AppCompatActivity {
 
-    private ImageButton cafeCurto;
-    private ImageButton cafeMédio;
-    private ImageButton cafeLongo;
-    private Switch conetar;
     private BluetoothAdapter mBTAdapter;
-    private Set<BluetoothDevice> mPairedDevices;
-    private ArrayAdapter<String> mBTArrayAdapter;
-    private ListView mDevicesListView;
-    private Handler mHandler; // Our main handler that will receive callback notifications
     private ConnectedThread mConnectedThread; // bluetooth background worker thread to send and receive data
     private BluetoothSocket mBTSocket = null; // bi-directional client-to-client data path
     private static final UUID BTMODULEUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
     private final static int REQUEST_ENABLE_BT = 1; // used to identify adding bluetooth names
-    private final static int MESSAGE_READ = 2; // used in bluetooth handler to identify message update
+    private boolean bluetoothDenied = false;
-    private final static int CONNECTING_STATUS = 3; // used in bluetooth handler to identify message status
 
 
     @Override
@@ -62,60 +55,19 @@ public class MainActivity extends AppCompatActivity {
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
             return insets;
         });
-        cafeCurto = (ImageButton) findViewById(R.id.cafeCurto);
+        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
-        cafeMédio = (ImageButton) findViewById(R.id.cafeMedio);
+            ActivityCompat.requestPermissions(this,
-        cafeLongo = (ImageButton) findViewById(R.id.cafeLongo);
+                    new String[]{Manifest.permission.BLUETOOTH_CONNECT, Manifest.permission.BLUETOOTH_SCAN},
-
+                    2);
-
+        }
-        mBTArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
         mBTAdapter = BluetoothAdapter.getDefaultAdapter(); // get a handle on the bluetooth radio
-
-
-        mHandler = new Handler() {
-            public void handleMessage(android.os.Message msg) {
-                if (msg.what == MESSAGE_READ) {
-                    String readMessage = null;
-                    try {
-                        readMessage = new String((byte[]) msg.obj, "UTF-8");
-                    } catch (UnsupportedEncodingException e) {
-                        e.printStackTrace();
-                    }
-                    //mReadBuffer.setText(readMessage);
-                }
-
-                if (msg.what == CONNECTING_STATUS) {
-                    if (msg.arg1 == 1)
-                        Toast.makeText(MainActivity.this, "Connected to Device: " + (String) (msg.obj), Toast.LENGTH_SHORT).show();
-                        //mBluetoothStatus.setText("Connected to Device: " + (String)(msg.obj));
-                    else
-                        Toast.makeText(MainActivity.this, "Connection Failed", Toast.LENGTH_SHORT).show();
-                    //mBluetoothStatus.setText("Connection Failed");
-                }
-            }
-        };
-
-        if (mBTArrayAdapter == null) {
-            // Device does not support Bluetooth
-            //mBluetoothStatus.setText("Status: Bluetooth not found");
-            Toast.makeText(MainActivity.this, "Bluetooth device not found!", Toast.LENGTH_SHORT).show();
-        } else {
-            conetar = (Switch) findViewById(R.id.conetar);
-            conetar.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
-                @Override
-                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
-                    if (conetar.isChecked()) {
-                        Toast.makeText(MainActivity.this, "Conetado", Toast.LENGTH_SHORT).show();
-                        ligarBluetooth();
-                    } else {
-                        Toast.makeText(MainActivity.this, "Desconetado", Toast.LENGTH_SHORT).show();
-                        desligarBluetooth();
-                    }
-                }
-            });
-
-        }
         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
-        ligarBluetooth();
+        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT)
+                != PackageManager.PERMISSION_GRANTED) {
+            ActivityCompat.requestPermissions(this,
+                    new String[]{Manifest.permission.BLUETOOTH_CONNECT, Manifest.permission.BLUETOOTH_SCAN},
+                    2);
+        }
     }
 
     public void cafeCurto(View view) {
@@ -144,17 +96,19 @@ public class MainActivity extends AppCompatActivity {
     }
 
     public void ligarBluetooth() {
+        if (mBTAdapter == null) {
+            runOnUiThread(() ->
+                    Toast.makeText(MainActivity.this, "Dispositivo não suporta Bluetooth", Toast.LENGTH_LONG).show()
+            );
+            return;
+        }
         mBTAdapter = BluetoothAdapter.getDefaultAdapter();
         if (!mBTAdapter.isEnabled()) {
             Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
             startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
-            //mBluetoothStatus.setText("Bluetooth enabled");
-            Toast.makeText(MainActivity.this, "Bluetooth turned on", Toast.LENGTH_SHORT).show();
 
-        } else {
-            Toast.makeText(MainActivity.this, "Bluetooth is already on", Toast.LENGTH_SHORT).show();
         }
-        //listarAparelhos();
+        else{
             final String address = "98:D3:21:FC:7F:DF";
             new Thread() {
                 public void run() {
@@ -166,43 +120,34 @@ public class MainActivity extends AppCompatActivity {
                         mBTSocket = createBluetoothSocket(device);
                     } catch (IOException e) {
                         fail = true;
-                    Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_SHORT).show();
+                        Log.d("bluetooth","Socket creation failed");
                     }
-                // Establish the Bluetooth socket connection.
                     try {
                         if (ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
-                        // TODO: Consider calling
+
-                        //    ActivityCompat#requestPermissions
-                        // here to request the missing permissions, and then overriding
-                        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
-                        //                                          int[] grantResults)
-                        // to handle the case where the user grants the permission. See the documentation
-                        // for ActivityCompat#requestPermissions for more details.
                             return;
                         }
+                        mBTAdapter.cancelDiscovery();
                         mBTSocket.connect();
                     } catch (IOException e) {
                         try {
                             fail = true;
                             mBTSocket.close();
-                        mHandler.obtainMessage(CONNECTING_STATUS, -1, -1)
-                                .sendToTarget();
                         } catch (IOException e2) {
-                        //insert code to deal with this
+                            Log.d("bluetooth","Socket creation failed");
-                        Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_SHORT).show();
                         }
                     }
                     if (fail == false) {
                         mConnectedThread = new ConnectedThread(mBTSocket);
                         mConnectedThread.start();
-
-                    mHandler.obtainMessage(CONNECTING_STATUS, 1, -1, "ASD")
-                            .sendToTarget();
                     }
                 }
             }.start();
         }
 
+
+    }
+
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent Data) {
         // Check which request we're responding to
@@ -210,170 +155,72 @@ public class MainActivity extends AppCompatActivity {
         if (requestCode == REQUEST_ENABLE_BT) {
             // Make sure the request was successful
             if (resultCode == RESULT_OK) {
-                // The user picked a contact.
+                ligarBluetooth();
-                // The Intent's data Uri identifies which contact was selected.
+                Toast.makeText(this, "Bluetooth Ligado", Toast.LENGTH_SHORT).show();
-                //mBluetoothStatus.setText("Enabled");
+            } else {
-                Toast.makeText(this, "Enabled", Toast.LENGTH_SHORT).show();
+                bluetoothDenied = true;
-            } else
+                Toast.makeText(this, "A App Precisa de Bluetooth para Funcionar", Toast.LENGTH_SHORT).show();
-                Toast.makeText(this, "Disabled", Toast.LENGTH_SHORT).show();
+                finish();
-            //mBluetoothStatus.setText("Disabled");
+            }
         }
     }
 
-    public void listarAparelhos() {
-        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
-            // TODO: Consider calling
-            //    ActivityCompat#requestPermissions
-            // here to request the missing permissions, and then overriding
-            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
-            //                                          int[] grantResults)
-            // to handle the case where the user grants the permission. See the documentation
-            // for ActivityCompat#requestPermissions for more details.
-            return;
-        }
-        mPairedDevices = mBTAdapter.getBondedDevices();
-        if (mBTAdapter.isEnabled()) {
-            // put it's one to the adapter
-            for (BluetoothDevice device : mPairedDevices)
-                mBTArrayAdapter.add(device.getName() + "\n" + device.getAddress());
 
-            Toast.makeText(getApplicationContext(), "Show Paired Devices", Toast.LENGTH_SHORT).show();
-        } else
-            Toast.makeText(getApplicationContext(), "Bluetooth not on", Toast.LENGTH_SHORT).show();
-    }
-
-    public void desligarBluetooth() {
-        //mBTAdapter.disable(); // turn off
-        //mBluetoothStatus.setText("Bluetooth disabled");
-        Toast.makeText(MainActivity.this, "Bluetooth turned Off", Toast.LENGTH_SHORT).show();
-    }
-
-    private AdapterView.OnItemClickListener mDeviceClickListener = new AdapterView.OnItemClickListener() {
-        public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
-
-            if (!mBTAdapter.isEnabled()) {
-                Toast.makeText(getBaseContext(), "Bluetooth not on", Toast.LENGTH_SHORT).show();
-                return;
-            }
-            Toast.makeText(MainActivity.this, "Connecting...", Toast.LENGTH_SHORT).show();
-            //mBluetoothStatus.setText("Connecting...");
-            // Get the device MAC address, which is the last 17 chars in the View
-            String info = ((TextView) v).getText().toString();
-            final String address = info.substring(info.length() - 17);
-            final String name = info.substring(0, info.length() - 17);
-
-            // Spawn a new thread to avoid blocking the GUI one
-            new Thread() {
-                public void run() {
-                    boolean fail = false;
-
-                    BluetoothDevice device = mBTAdapter.getRemoteDevice(address);
-
-                    try {
-                        mBTSocket = createBluetoothSocket(device);
-                    } catch (IOException e) {
-                        fail = true;
-                        Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_SHORT).show();
-                    }
-                    // Establish the Bluetooth socket connection.
-                    try {
-                        if (ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
-                            // TODO: Consider calling
-                            //    ActivityCompat#requestPermissions
-                            // here to request the missing permissions, and then overriding
-                            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
-                            //                                          int[] grantResults)
-                            // to handle the case where the user grants the permission. See the documentation
-                            // for ActivityCompat#requestPermissions for more details.
-                            return;
-                        }
-                        mBTSocket.connect();
-                    } catch (IOException e) {
-                        try {
-                            fail = true;
-                            mBTSocket.close();
-                            mHandler.obtainMessage(CONNECTING_STATUS, -1, -1)
-                                    .sendToTarget();
-                        } catch (IOException e2) {
-                            //insert code to deal with this
-                            Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_SHORT).show();
-                        }
-                    }
-                    if (fail == false) {
-                        mConnectedThread = new ConnectedThread(mBTSocket);
-                        mConnectedThread.start();
-
-                        mHandler.obtainMessage(CONNECTING_STATUS, 1, -1, name)
-                                .sendToTarget();
-                    }
-                }
-            }.start();
-        }
-    };
 
     private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
         if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
-            // TODO: Consider calling
-            //    ActivityCompat#requestPermissions
-            // here to request the missing permissions, and then overriding
-            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
-            //                                          int[] grantResults)
-            // to handle the case where the user grants the permission. See the documentation
-            // for ActivityCompat#requestPermissions for more details.
 
         }
         return device.createRfcommSocketToServiceRecord(BTMODULEUUID);
-        //creates secure outgoing connection with BT device using UUID
     }
     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 input and output streams, using temp objects because
-            // member streams are final
             try {
-                tmpIn = socket.getInputStream();
                 tmpOut = socket.getOutputStream();
             } catch (IOException e) {
+                Log.e("Bluetooth", "Erro ao obter OutputStream", e);
             }
 
-            mmInStream = tmpIn;
             mmOutStream = tmpOut;
         }
 
-        public void run() {
-            byte[] buffer = new byte[1024];  // 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.available();
-                    if (bytes != 0) {
-                        SystemClock.sleep(100); //pause and wait for rest of data. Adjust this depending on your sending speed.
-                        bytes = mmInStream.available(); // how many bytes are ready to be read?
-                        bytes = mmInStream.read(buffer, 0, bytes); // record how many bytes we actually read
-                        mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
-                                .sendToTarget(); // Send the obtained bytes to the UI activity
-                    }
-                } catch (IOException e) {
-                    e.printStackTrace();
-
-                    break;
-                }
-            }
-        }
         public void enviarComando(String input){
             byte[] bytes = input.getBytes();           //converts entered String into bytes
             try {
                 mmOutStream.write(bytes);
-            } catch (IOException e) { }
+            } catch (IOException e) {
+                Log.e("Bluetooth", "Erro ao obter OutputStream", e);
+            }
+        }
+    }
+    private void desligarBluetooth() {
+        try {
+            if (mConnectedThread != null) {
+                mConnectedThread.interrupt();
+            }
+            if (mBTSocket != null) {
+                mBTSocket.close();
+                mBTSocket = null;
+            }
+        } catch (IOException e) {
+            Log.e("Bluetooth", "Erro ao desligar", e);
+        }
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        desligarBluetooth();
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        if ((mBTSocket == null || !mBTSocket.isConnected()) && !bluetoothDenied) {
+            ligarBluetooth();
         }
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -20,16 +20,7 @@
         android:layout_alignParentTop="true"
         android:layout_margin="16sp"/>
 
-    <Switch
+
-        android:id="@+id/conetar"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_alignParentBottom="true"
-        android:layout_centerHorizontal="true"
-        android:layout_margin="30dp"
-        android:text="@string/ligarmaquina"
-        android:textColor="#745426"
-        android:textSize="13pt"/>
     <LinearLayout
         android:id="@+id/botoes"
         android:layout_marginTop="150dp"