first version

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild

.idea/gradle.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+        <option name="resolveModulePerSourceSet" value="false" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
+    <option name="myDefaultNotNull" value="android.support.annotation.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="4">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="4">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+        </list>
+      </value>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/BTDemo.iml" filepath="$PROJECT_DIR$/BTDemo.iml" />
+      <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" />
+    </modules>
+  </component>
+</project>

.idea/runConfigurations.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+apply plugin: 'kotlin-android'
+
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion "26.0.0"
+    defaultConfig {
+        applicationId "xyz.mtfos.btdemo"
+        minSdkVersion 18
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
+    implementation 'com.android.support:appcompat-v7:26.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.0'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.0'
+    implementation 'org.apache.commons:commons-lang3:3.6'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/jay/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/xyz/mtfos/btdemo/ExampleInstrumentedTest.kt

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+package xyz.mtfos.btdemo
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getTargetContext()
+        assertEquals("xyz.mtfos.btdemo", appContext.packageName)
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="xyz.mtfos.btdemo">
+
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:largeHeap="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/xyz/mtfos/btdemo/BLECls.java

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+package xyz.mtfos.btdemo;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.bluetooth.BluetoothGatt;
+import android.bluetooth.BluetoothGattCallback;
+import android.bluetooth.BluetoothGattCharacteristic;
+import android.bluetooth.BluetoothGattDescriptor;
+import android.bluetooth.BluetoothGattService;
+import android.bluetooth.BluetoothManager;
+import android.content.Context;
+import android.os.Handler;
+import android.provider.ContactsContract;
+import android.util.Log;
+
+import org.apache.commons.lang3.ArrayUtils;
+
+import java.nio.charset.StandardCharsets;
+import java.sql.Time;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.UUID;
+
+/**
+ * Created by jay on 2017/8/9.
+ */
+
+public class BLECls {
+    // BLEDemo主要代碼
+    private BluetoothAdapter mBtAdapter = null;
+    private BluetoothGatt mBtGatt = null;
+    public int mState = 0;
+    private Context mContext;
+    private BluetoothGattCharacteristic mWriteCharacteristic = null;
+    private BluetoothGattCharacteristic mReadCharacteristric = null;
+
+    private final String TAG = "BLE_Demo";
+
+    // 設備連接狀態
+    public final int CONNECTED = 0x01;
+    public final int DISCONNECTED = 0x02;
+    public final int CONNECTTING = 0x03;
+
+    private ArrayList<HashMap<String, Object>> queue = new ArrayList<>();
+
+    public int ready = 0;
+    private boolean queueRunning = false;
+    private boolean scanning = false;
+
+    // ble address
+    public static final String BLEAddr = "B8:27:EB:21:C2:1A";
+    // 讀寫相關的Service、Characteristic的UUID
+    public static final UUID ServiceUUID = UUID.fromString("dd535b71-8f05-4e30-beb0-6fa7ea3dfc3e");
+    public static final UUID TimeUUID = UUID.fromString("00000001-8f05-4e30-beb0-6fa7ea3dfc3e");
+    public static final UUID DataUUID = UUID.fromString("00000002-8f05-4e30-beb0-6fa7ea3dfc3e");
+
+
+    // BLE設備連接通信過程中回調
+    private BluetoothGattCallback mBtGattCallback = new BluetoothGattCallback() {
+
+        // 連接狀態發生改變時的回調
+        @Override
+        public void onConnectionStateChange(BluetoothGatt gatt, int status,
+                                            int newState) {
+
+            if (status == BluetoothGatt.GATT_SUCCESS) {
+                mState = CONNECTED;
+                Log.d(TAG, "connected OK");
+                mBtGatt.discoverServices();
+            } else if (newState == BluetoothGatt.GATT_FAILURE) {
+                mState = DISCONNECTED;
+                Log.d(TAG, "connect failed");
+            }
+        }
+
+        // 遠端設備中的服務可用時的回調
+        @Override
+        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
+
+            if (status == BluetoothGatt.GATT_SUCCESS) {
+                BluetoothGattService btService = mBtGatt.getService(ServiceUUID);
+                if (btService != null) {
+                    mWriteCharacteristic = btService.getCharacteristic(DataUUID);
+                    mReadCharacteristric = btService.getCharacteristic(TimeUUID);
+                }
+            }
+        }
+
+        // 某Characteristic的狀態為可讀時的回調
+        @Override
+        public void onCharacteristicRead(BluetoothGatt gatt,
+                                         BluetoothGattCharacteristic characteristic, int status) {
+
+
+        }
+
+        // 寫入Characteristic成功與否的回調
+        @Override
+        public void onCharacteristicWrite(BluetoothGatt gatt,
+                                          BluetoothGattCharacteristic characteristic, int status) {
+            switch (status) {
+                case BluetoothGatt.GATT_SUCCESS:
+                    Log.d(TAG, "write data success");
+                    break;// 寫入成功
+                case BluetoothGatt.GATT_FAILURE:
+                    Log.d(TAG, "write data failed");
+                    break;// 寫入失敗
+                case BluetoothGatt.GATT_WRITE_NOT_PERMITTED:
+                    Log.d(TAG, "write not permitted");
+                    break;// 沒有寫入的權限
+            }
+            queueRunning = false;
+            runQueue();
+        }
+
+        // 訂閱了遠端設備的Characteristic信息後，
+        // 當遠端設備的Characteristic信息發生改變後,回調此方法
+        @Override
+        public void onCharacteristicChanged(BluetoothGatt gatt,
+                                            BluetoothGattCharacteristic characteristic) {
+            readCharacterisricValue(characteristic);
+        }
+
+    };
+
+    /**
+     * 讀取BluetoothGattCharacteristic中的數據
+     *
+     * @param characteristic
+     */
+    private void readCharacterisricValue(
+            BluetoothGattCharacteristic characteristic) {
+        byte[] data = characteristic.getValue();
+        StringBuffer buffer = new StringBuffer("0x");
+        int i;
+        for (byte b : data) {
+            i = b & 0xff;
+            buffer.append(Integer.toHexString(i));
+        }
+        Log.d(TAG, "read data:" + buffer.toString());
+        Log.d(TAG, "read data(as string}:" + new String(data));
+    }
+
+    /**
+     * 與指定的設備建立連接
+     *
+     * @param device
+     */
+    public void connect(BluetoothDevice device) {
+
+        mBtGatt = device.connectGatt(mContext, false, mBtGattCallback);
+        mState = CONNECTTING;
+    }
+
+    public boolean isScanning() {
+        return scanning;
+    }
+
+    public void disconnect() {
+        if (mBtGatt != null) {
+            mBtGatt.disconnect();
+        }
+    }
+
+    /**
+     * 初始化
+     *
+     * @return 如果初始化成功則返回true
+     */
+    public boolean init() {
+        BluetoothManager btMrg = (BluetoothManager) mContext
+                .getSystemService(Context.BLUETOOTH_SERVICE);
+        if (btMrg == null)
+            return false;
+        mBtAdapter = btMrg.getAdapter();
+        if (mBtAdapter == null)
+            return false;
+        return true;
+    }
+
+    // BLE設備搜索過程中的回調，在此可以根據外圍設備廣播的消息來對設備進行過濾
+    private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {
+
+        @Override
+        public void onLeScan(final BluetoothDevice device, int rssi,
+                             byte[] scanRecord) {
+
+            ArrayUtils.reverse(scanRecord);// 數組反轉
+            // 將Byte數組的數據以十六進製表示並拼接成字符串
+            StringBuffer str = new StringBuffer();
+            int i = 0;
+            for (byte b : scanRecord) {
+                i = (b & 0xff);
+                str.append(Integer.toHexString(i));
+            }
+            String discoveryServceID = str.toString();
+            Log.d(TAG, device.getName() + " scanRecord:\n" + discoveryServceID);
+            Log.d(TAG, device.getAddress());
+            // 查詢是否含有指定的Service UUID信息
+//            if (discoveryServceID.indexOf(ServiceUUID.toString().replace("-", "")) != -1) {
+            if (device.getAddress().equals(BLEAddr)) {
+
+                Log.d(TAG, device.getName() + " has available service UUID");
+
+                // 在這是處理匹配的設備……
+                stopScan();
+                connect(device);
+            }
+
+        }
+
+    };
+
+    /**
+     * 開始BLE設備掃瞄
+     */
+    public void startScan() {
+        scanning = true;
+        mBtAdapter.startLeScan(mLeScanCallback);
+    }
+
+    /**
+     * 停止BLE設備掃瞄
+     */
+    public void stopScan() {
+        scanning = false;
+        mBtAdapter.stopLeScan(mLeScanCallback);
+    }
+
+    /**
+     * 發送數據
+     *
+     * @param data 待發送的數據,最大長度為20
+     */
+    private void sendData(byte[] data) {
+
+        if (data != null && data.length > 0 && data.length < 21) {
+            boolean w = mWriteCharacteristic.setValue(data);
+            boolean s = mBtGatt.writeCharacteristic(mWriteCharacteristic);
+            System.out.println("send data status ::: " + w + " / " + s);
+            if (w && s) {
+                Log.d(TAG, "send data OK");
+            }
+        }
+    }
+
+    public void sendLongData(byte[] data) {
+        if (data == null || data.length == 0) return;
+        Log.d(TAG, "start send data");
+        Log.d(TAG, "Data Length :::: " + data.length);
+        byte[] st = new byte[1];
+        Arrays.fill(st, (byte) 0x00);
+        byte[] ed = new byte[1];
+        Arrays.fill(ed, (byte) 0xff);
+        HashMap a = new HashMap();
+        a.put("type", "w");
+        a.put("data", st);
+        pushQueue(a);
+
+        int idx = 0;
+
+        while (true) {
+            int s = idx * 18;
+            int e = idx * 18 + 18;
+            e = e > data.length ? data.length : e;
+            byte[] tmp = Arrays.copyOfRange(data, s, e);
+            byte[] tt = new byte[2 + tmp.length];
+            tt[1] = (byte) (idx & 0xff);
+            tt[0] = (byte) ((idx >> 8) & 0xff);
+            for (int i = 2; i < tt.length; i++) {
+                if (i - 2 >= tmp.length) break;
+                tt[i] = tmp[i - 2];
+            }
+
+            HashMap thash = new HashMap();
+            thash.put("type", "w");
+            thash.put("data", tt);
+
+            pushQueue(thash);
+            idx++;
+
+            if (e >= data.length) break;
+        }
+
+        HashMap b = new HashMap();
+        b.put("type", "w");
+        b.put("data", ed);
+        pushQueue(b);
+    }
+
+    private void pushQueue(HashMap d) {
+        if (queue == null) queue = new ArrayList<>();
+        queue.add(d);
+        runQueue();
+    }
+
+    private void runQueue() {
+        if (queue == null) queue = new ArrayList<>();
+        if (queue.size() < 1 || queueRunning == true) return;
+        queueRunning = true;
+        HashMap tmp = queue.get(0);
+        queue.remove(0);
+        if (((String) tmp.get("type")).equals("w")) {
+            byte[] d = (byte[]) tmp.get("data");
+            sendData(d);
+        }
+    }
+
+    public BLECls(Context ctx) {
+        this.mContext = ctx;
+    }
+
+
+}

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

@@ -0,0 +1,69 @@
+package xyz.mtfos.btdemo
+
+import android.app.Activity
+import android.os.Bundle
+import android.os.Handler
+import android.widget.Button
+import android.widget.EditText
+import xyz.mtfos.btdemo.objectTool.bind
+
+/**
+ * Created by jay on 2017/8/9.
+ */
+class MainActivity : Activity() {
+    val intxt: EditText by bind(R.id.intxt)
+    val btn: Button by bind(R.id.bt)
+    var ble: BLECls? = null
+    val uiHandler: Handler = Handler()
+    var th: Thread? = null
+    var thrun: Boolean = false
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        btn.isEnabled = false
+
+        ble = BLECls(this@MainActivity)
+
+        if (ble?.init()!!) {
+            ble?.startScan()
+        }
+
+        th = Thread(Runnable { ->
+            {}.run {
+                thrun = true
+                while (thrun) {
+                    System.out.println("state ===== " + ble?.mState)
+                    if (ble?.mState == ble?.CONNECTED) {
+                        uiHandler.post {
+                            run {
+                                btn.isEnabled = true
+                            }
+                        }
+                        thrun = false
+                        break
+                    }
+                    Thread.sleep(200)
+                }
+            }
+        })
+        th?.start()
+
+        btn.setOnClickListener {
+            val txt: String = intxt.text.toString()
+            ble?.sendLongData(txt.toByteArray())
+        }
+    }
+
+    override fun onStop() {
+        super.onStop()
+        thrun = false
+        if (ble?.isScanning!!) {
+            ble?.stopScan()
+        }
+        if (ble?.mState == ble?.CONNECTED) {
+            ble?.disconnect()
+        }
+    }
+}

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

@@ -0,0 +1,23 @@
+package xyz.mtfos.btdemo
+
+/**
+ * Created by jay on 2017/8/12.
+ */
+
+import android.app.Activity
+import android.support.annotation.IdRes
+import android.view.View
+
+object objectTool {
+    fun <T : View> Activity.bind(@IdRes idRes: Int): Lazy<T> {
+        @Suppress("UNCHECKED_CAST")
+        return unsafeLazy { findViewById<T>(idRes) }
+    }
+
+    fun <T : View> View.bind(@IdRes idRes: Int): Lazy<T> {
+        @Suppress("UNCHECKED_CAST")
+        return unsafeLazy { findViewById<T>(idRes) }
+    }
+
+    private fun <T> unsafeLazy(initializer: () -> T) = lazy(LazyThreadSafetyMode.NONE, initializer)
+}

app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,113 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="108.0"
+    android:viewportWidth="108.0">
+    <path
+        android:fillColor="#26A69A"
+        android:pathData="M0,0h108v108h-108z"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+</vector>
+

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

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <EditText
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:id="@+id/intxt"
+        android:hint="輸入傳送字串"/>
+
+    <Button
+        android:id="@+id/bt"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Send"
+        android:textAllCaps="false" />
+
+</LinearLayout>

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@mipmap/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@mipmap/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

app/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">BTDemo</string>
+</resources>

app/src/main/res/values/styles.xml

@@ -0,0 +1,11 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>

app/src/test/java/xyz/mtfos/btdemo/ExampleUnitTest.kt

@@ -0,0 +1,17 @@
+package xyz.mtfos.btdemo
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}

build.gradle

@@ -0,0 +1,27 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    ext.kotlin_version = '1.1.3-2'
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.0.0-beta2'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

gradle.properties

@@ -0,0 +1,17 @@
+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Mon Aug 07 11:04:39 CST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-rc-1-all.zip

gradlew

@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"

gradlew.bat

@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1 @@
+include ':app'