Remoção de código inútil

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;
@@ -52,10 +54,22 @@ public class MainActivity extends AppCompatActivity {
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
             return insets;
         });
+        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);
+        }
         mBTAdapter = BluetoothAdapter.getDefaultAdapter(); // get a handle on the bluetooth radio
         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
+        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);
+        } else {
             ligarBluetooth();
         }
+    }
 
     public void cafeCurto(View view) {
         Toast.makeText(this, "Café Curto", Toast.LENGTH_SHORT).show();
@@ -83,6 +97,12 @@ 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);
@@ -104,20 +124,21 @@ 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");
                 }
                 try {
                     if (ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
 
                         return;
                     }
+                    mBTAdapter.cancelDiscovery();
                     mBTSocket.connect();
                 } catch (IOException e) {
                     try {
                         fail = true;
                         mBTSocket.close();
                     } catch (IOException e2) {
-                        Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_SHORT).show();
+                        Log.d("bluetooth","Socket creation failed");
                     }
                 }
                 if (fail == false) {
@@ -157,6 +178,7 @@ public class MainActivity extends AppCompatActivity {
             try {
                 tmpOut = socket.getOutputStream();
             } catch (IOException e) {
+                Log.e("Bluetooth", "Erro ao obter OutputStream", e);
             }
 
             mmOutStream = tmpOut;
@@ -166,13 +188,23 @@ public class MainActivity extends AppCompatActivity {
             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();
-        } catch (IOException e) {}
+                mBTSocket = null;
+            }
+        } catch (IOException e) {
+            Log.e("Bluetooth", "Erro ao desligar", e);
+        }
     }
 
     @Override
@@ -184,6 +216,8 @@ public class MainActivity extends AppCompatActivity {
     @Override
     protected void onResume() {
         super.onResume();
+        if (mBTSocket == null || !mBTSocket.isConnected()) {
             ligarBluetooth();
         }
     }
+}