update

app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt

@@ -13,20 +13,45 @@ import xyz.mtfos.btdemo.objectTool.bind
 class MainActivity : Activity() {
     val intxt: EditText by bind(R.id.intxt)
     val btn: Button by bind(R.id.bt)
+    val connectBtn: Button by bind(R.id.connect)
+    val disconnectBtn: Button by bind(R.id.disconnect)
     var ble: BLECls? = null
     val uiHandler: Handler = Handler()
     var th: Thread? = null
     var thrun: Boolean = false
+    var isInit: Boolean = false
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
         btn.isEnabled = false
+        connectBtn.isEnabled = true
+        disconnectBtn.isEnabled = false
 
         ble = BLECls(this@MainActivity)
 
+        btn.setOnClickListener {
+            val txt: String = intxt.text.toString()
+            ble?.sendLongData(txt.toByteArray())
+        }
+
+        connectBtn.setOnClickListener {
+            scanConnect()
+        }
+        disconnectBtn.setOnClickListener {
+            disconnect()
+        }
+    }
+
+    override fun onStop() {
+        super.onStop()
+        disconnect()
+    }
+
+    fun scanConnect(){
         if (ble?.init()!!) {
+            isInit = true
             ble?.startScan()
         }
 
@@ -37,6 +62,8 @@ class MainActivity : Activity() {
                 if (ble?.mState == ble?.CONNECTED) {
                     uiHandler.post {
                         btn.isEnabled = true
+                        disconnectBtn.isEnabled = true
+                        connectBtn.isEnabled = false
                     }
                     thrun = false
                     break
@@ -45,15 +72,9 @@ class MainActivity : Activity() {
             }
         })
         th?.start()
-
-        btn.setOnClickListener {
-            val txt: String = intxt.text.toString()
-            ble?.sendLongData(txt.toByteArray())
-        }
     }
 
-    override fun onStop() {
-        super.onStop()
+    fun disconnect() {
         thrun = false
         if (ble?.isScanning!!) {
             ble?.stopScan()
@@ -61,5 +82,7 @@ class MainActivity : Activity() {
         if (ble?.mState == ble?.CONNECTED) {
             ble?.disconnect()
         }
+        disconnectBtn.isEnabled = false
+        connectBtn.isEnabled = true
     }
 }

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

@@ -4,6 +4,24 @@
     android:layout_height="match_parent"
     android:orientation="vertical">
 
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+        <Button
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:id="@+id/connect"
+            android:text="Connect"
+            android:textAllCaps="false"/>
+        <Button
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:id="@+id/disconnect"
+            android:text="Disconnect"
+            android:textAllCaps="false"/>
+    </LinearLayout>
+
     <EditText
         android:layout_width="match_parent"
         android:layout_height="wrap_content"