feat: redesign and lots of progress

android/app/src/main/kotlin/com/example/abawo_bt_app/MainActivity.kt

@@ -1,5 +1,55 @@
 package com.example.abawo_bt_app
 
+import android.content.Intent
+import android.os.Bundle
+import android.provider.Settings
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
+import io.reactivex.exceptions.UndeliverableException
+import io.reactivex.plugins.RxJavaPlugins
 
-class MainActivity: FlutterActivity()
+class MainActivity: FlutterActivity() {
+    private val settingsChannel = "abawo/settings"
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        RxJavaPlugins.setErrorHandler { throwable ->
+            val error = if (throwable is UndeliverableException && throwable.cause != null) {
+                throwable.cause!!
+            } else {
+                throwable
+            }
+            val className = error.javaClass.name
+            val message = error.message.orEmpty()
+            if (className.contains("BleGatt") || message.contains("GATT exception")) {
+                return@setErrorHandler
+            }
+            Thread.currentThread().uncaughtExceptionHandler
+                ?.uncaughtException(Thread.currentThread(), error)
+        }
+        super.onCreate(savedInstanceState)
+    }
+
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        super.configureFlutterEngine(flutterEngine)
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, settingsChannel)
+            .setMethodCallHandler { call, result ->
+                when (call.method) {
+                    "openBluetoothSettings" -> {
+                        try {
+                            startActivity(Intent(Settings.ACTION_BLUETOOTH_SETTINGS))
+                            result.success(true)
+                        } catch (_: Exception) {
+                            try {
+                                startActivity(Intent(Settings.ACTION_SETTINGS))
+                                result.success(true)
+                            } catch (_: Exception) {
+                                result.success(false)
+                            }
+                        }
+                    }
+                    else -> result.notImplemented()
+                }
+            }
+    }
+}