[fix] Fix Android 11 permission issues

Author: JCxYIS

README.md

@@ -14,6 +14,8 @@ Connect with bluetooth in Unity (Android).
 
 ## Notes
 
+<!--
+
 ### AndroidManifest Permission
 These permissions are required!! You **MUST** add them to your manifest (`Plugins/Android/AndroidManifest.xml`).
 
@@ -22,10 +24,12 @@ These permissions are required!! You **MUST** add them to your manifest (`Plugin
     <uses-permission android:name="android.permission.BLUETOOTH"/>
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
     <!-- For scanning nearby devices -->
-    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
-    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />  <!-- Android > 10 -->
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />  <!-- Android 9 -->
 ```
 
+-->
+
 After you install the app, you may need to manually enable the permissions under android application settings.
 
 <img src="https://i.imgur.com/33vq1ev.png" height="400" />

UnityBluetooth-AndroidStudio/.idea/compiler.xml

@@ -8,7 +8,7 @@ android {
 
     defaultConfig {
 //        applicationId "com.jcxyis.unitybluetooth"
-        minSdk 21
+        minSdk 19
         targetSdk 32
 //        versionCode 1
 //        versionName "1.0"
@@ -30,25 +30,26 @@ android {
 
 dependencies {
 
-    implementation 'androidx.appcompat:appcompat:1.4.1'
-    implementation 'com.google.android.material:material:1.5.0'
-    implementation files('libs\\classes.jar')
+    compileOnly 'androidx.appcompat:appcompat:1.4.1'
+    compileOnly 'com.google.android.material:material:1.5.0'
+    compileOnly files('libs\\classes.jar')
+
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
 }
 
-// 移除舊的 jar 檔
-task deleteOldJar(type: Delete) {
-    delete 'release/UnityBtAndroidPlugin.jar'
-}
-
-// 匯出 jar 檔
-task exportJar(type: Copy) {
-    from('build/intermediates/aar_main_jar/release/')
-    into('release/')
-    include('classes.jar')
-    rename('classes.jar', 'UnityBtAndroidPlugin.jar')
-}
-
-exportJar.dependsOn(deleteOldJar, build)
+// use assembleRelease instead
+//// 移除舊的 jar 檔
+//task deleteOldJar(type: Delete) {
+//    delete 'release/UnityBtAndroidPlugin.jar'
+//}
+//
+//// 匯出 jar 檔
+//task exportJar(type: Copy) {
+//    from('build/intermediates/aar_main_jar/release/')
+//    into('release/')
+//    include('classes.jar')
+//    rename('classes.jar', 'UnityBtAndroidPlugin.jar')
+//}
+//exportJar.dependsOn(deleteOldJar, build)

UnityBluetooth-AndroidStudio/.idea/gradle.xml

@@ -2,18 +2,13 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
-    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
     <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
-    <application
-        android:allowBackup="true"
-        android:dataExtractionRules="@xml/data_extraction_rules"
-        android:fullBackupContent="@xml/backup_rules"
-        android:icon="@mipmap/ic_launcher"
-        android:label="@string/app_name"
-        android:roundIcon="@mipmap/ic_launcher_round"
-        android:supportsRtl="true"
-        android:theme="@style/Theme.UnityBluetooth"
-        tools:targetApi="31" />
+
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />  <!-- Android > 10 -->
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />  <!-- Android 9 -->
+
+    <application />
 
 </manifest>

UnityBluetooth-AndroidStudio/.idea/misc.xml

@@ -3,26 +3,30 @@
 import com.unity3d.player.UnityPlayer;
 import com.unity3d.player.UnityPlayerActivity;
 
+import android.Manifest;
 import android.annotation.SuppressLint;
+import android.app.Activity;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.BluetoothSocket;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.os.Build;
 import android.util.Log;
 import android.widget.Toast;
 
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.lang.reflect.Array;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.UUID;
 
-@SuppressLint("MissingPermission")
 public class BluetoothManager  {
     // instance (expose for unity to get)
     private static final BluetoothManager _instance = new BluetoothManager();
@@ -49,11 +53,35 @@ public BluetoothManager() {
         // Input pin code
         IntentFilter filter2 = new IntentFilter(BluetoothDevice.ACTION_PAIRING_REQUEST);
         UnityPlayer.currentActivity.registerReceiver(pairRequestHandler, filter2);
+
+        IntentFilter filter3 = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED);
+        UnityPlayer.currentActivity.registerReceiver(disconnectHandler, filter3);
+
     }
 
 
     // --- Bt ---
 
+    public void CheckPermission() {
+        // Request permissions
+        ArrayList<String> perms = new ArrayList<>();
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            perms.add(Manifest.permission.ACCESS_BACKGROUND_LOCATION);
+            perms.add(Manifest.permission.ACCESS_FINE_LOCATION);
+        }
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+            perms.add(Manifest.permission.BLUETOOTH_SCAN);
+            perms.add(Manifest.permission.BLUETOOTH_CONNECT);
+        }
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+//           if (UnityPlayer.currentActivity.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
+//                }
+            Log.i("BTManager", "Requesting "+perms.size()+" permissions");
+            UnityPlayer.currentActivity.requestPermissions(perms.toArray(new String[]{}), 0);
+        }
+    }
+
     // Start Discovering devices
     public void StartDiscovery() {
         // init the list
@@ -97,28 +125,42 @@ public boolean Connect(final String mac, final String pin) {
         }
         catch (Exception e) {
             bt.startDiscovery();
-            Log.e("BtManager", "Failed to connect!!! ");
+            Log.e("BtManager", "Failed to connect!! ");
             e.printStackTrace();
             return false;
         }
     }
 
+    public boolean IsConnected() {
+        if(socket == null)
+            return false;
+        return true;
+//        return socket.isConnected();  // this doesn't check connection state!
+    }
+
+    public String GetConnectedDevice() {
+        if(IsConnected())
+            return connectedDevice.getName()+ '|' + connectedDevice.getAddress();
+        return "|";
+    }
+
     public boolean Send(final String message) {
         try {
             socket.getOutputStream().write(message.getBytes());
-            Log.v("tManager", "Sent "+message);
+            Log.v("BtManager", "Sent "+message);
             return true;
         }
         catch (Exception e) {
             Log.e("BtManager", "Failed to send message");
             e.printStackTrace();
             return false;
         }
-//        return false;
     }
 
     // Available
     public int Available() {
+        if(socket == null)
+            return -2;
         try {
             return socket.getInputStream().available();
         }
@@ -148,9 +190,14 @@ public String ReadLine(){
     }
 
     // Stop
-    public void Stop() throws IOException {
+    public void Stop() {
         if(socket != null) {
-            socket.close();
+            try {
+                socket.close();
+            } catch (IOException e) {
+                Log.e("BtManager", "Error on disconnecting");
+                e.printStackTrace();
+            }
         }
         socket = null;
         connectedDevice = null;
@@ -212,6 +259,17 @@ public void onReceive(Context context, Intent intent) {
         }
     };
 
+    private final BroadcastReceiver disconnectHandler = new BroadcastReceiver() {
+        public void onReceive(Context context, Intent intent) {
+            connectedDevice = null;
+            try {
+                socket.close();
+            } catch (IOException ignored) {}
+            socket = null;
+            connectedDevice = null;
+        }
+    };
+
 
     // --- Utility --
 

UnityBluetooth-AndroidStudio/app/build.gradle

@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="purple_200">#FFBB86FC</color>
-    <color name="purple_500">#FF6200EE</color>
-    <color name="purple_700">#FF3700B3</color>
-    <color name="teal_200">#FF03DAC5</color>
-    <color name="teal_700">#FF018786</color>
-    <color name="black">#FF000000</color>
-    <color name="white">#FFFFFFFF</color>
+<!--    <color name="purple_200">#FFBB86FC</color>-->
+<!--    <color name="purple_500">#FF6200EE</color>-->
+<!--    <color name="purple_700">#FF3700B3</color>-->
+<!--    <color name="teal_200">#FF03DAC5</color>-->
+<!--    <color name="teal_700">#FF018786</color>-->
+<!--    <color name="black">#FF000000</color>-->
+<!--    <color name="white">#FFFFFFFF</color>-->
 </resources>