initial

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.3"
+
+    defaultConfig {
+        applicationId "com.kitsprout.main"
+        minSdkVersion 24
+        targetSdkVersion 29
+        versionCode 2
+        versionName "1.1"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+
+        externalNativeBuild {
+            cmake {
+                cppFlags ""
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    android.applicationVariants.all { variant ->
+        variant.outputs.all {
+            def project = 'kSerialBLE'
+            def SEP = '-'
+            def version = variant.versionName
+            outputFileName = project + SEP + version + ".apk"
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            path "src/main/jni/CMakeLists.txt"
+            version "3.10.2"
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    implementation 'com.google.android.material:material:1.1.0'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# 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/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="com.kitsprout.main">
+
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="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/com/kitsprout/ks/KBluetooth.java

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+package com.kitsprout.ks;
+
+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.util.Log;
+import android.view.Menu;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Set;
+import java.util.UUID;
+
+public class KBluetooth {
+
+    private static final String TAG = "KSBLE";
+    private static final UUID btUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
+
+    private static boolean connectStatus;
+    private static BluetoothAdapter adapter;
+    private static BluetoothDevice[] deviceList;
+    private static BluetoothSocket socket;
+    private static InputStream inputStream;
+    private static OutputStream outputStream;
+
+    public static BluetoothDevice device;
+
+    public static boolean startup(Context context) {
+        connectStatus = false;
+
+        Log.d(TAG, "kBluetooth startup ...");
+
+        // get the bluetooth adapter
+        adapter = getAdapter();
+        if (adapter == null) {
+            Log.e(TAG, "    getAdapter() ... error");
+            return false;
+        }
+        Log.d(TAG, "    getAdapter() ... ok");
+
+        // get bluetooth paired devices
+        deviceList = getPairedDevice(adapter);
+        Log.d(TAG, "    getPairedDevice() ... ok");
+        // select print device list
+        for (int i = 0; i < deviceList.length; i++) {
+            Log.d(TAG, "        [" + (i+1) + "] "
+                    + deviceList[i].getName() +
+                    " (" + deviceList[i].getAddress() + ")");
+        }
+
+        // listening bluetooth broadcasts
+        BroadcastReceiver btReceiver = new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                String action = intent.getAction();
+                if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
+                    connectStatus = true;
+                    Log.d(TAG, "onReceive() ... connected");
+                } else if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)) {
+                    if (connectStatus) {
+                        connectStatus = false;
+                        disconnect();
+                    }
+                    Log.d(TAG, "onReceive() ... disconnected");
+                }
+            }
+        };
+        IntentFilter btConnectFilter = new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED);
+        IntentFilter btDisconnectFilter = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED);
+        context.registerReceiver(btReceiver, btConnectFilter);
+        context.registerReceiver(btReceiver, btDisconnectFilter);
+
+        return true;
+    }
+
+    private static BluetoothAdapter getAdapter() {
+//        Log.d(TAG, "getAdapter()");
+        BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
+        if (btAdapter == null) {
+            Log.e(TAG, "device doesn't support bluetooth");
+            return null;
+        }
+        return btAdapter;
+    }
+
+    private static BluetoothDevice[] getPairedDevice(BluetoothAdapter btAdapter) {
+//        Log.d(TAG, "getPairedDevice()");
+        BluetoothDevice[] btDeviceList = null;
+        Set<BluetoothDevice> btDevicesList = btAdapter.getBondedDevices();
+        if (btDevicesList.size() > 0) {
+            int cnt = 0;
+            btDeviceList = new BluetoothDevice[btDevicesList.size()];
+            for (BluetoothDevice device : btDevicesList) {
+                btDeviceList[cnt++] = device;
+            }
+        }
+        return btDeviceList;
+    }
+
+    private static BluetoothSocket getSocket(BluetoothDevice device) {
+//        Log.d(TAG, "getSocket()");
+        BluetoothSocket btSocket = null;
+        try {
+            btSocket = device.createRfcommSocketToServiceRecord(btUUID);
+        } catch (IOException e) {
+            Log.e(TAG, "getSocket() method failed", e);
+        }
+        return btSocket;
+    }
+
+    private static BluetoothDevice getDevice(BluetoothAdapter btAdapter, String address) {
+//        Log.d(TAG, "getDevice()");
+        return btAdapter.getRemoteDevice(address);
+    }
+
+    public static String[] getDeviceName() {
+//        Log.d(TAG, "getDeviceName()");
+        String[] deviceName = new String[deviceList.length];
+        for (int i = 0; i < deviceList.length; i++) {
+            String name = deviceList[i].getName();
+            if (deviceList[i].getName().length() > 13) {
+                name = name.substring(0, 10) + "...";
+            }
+            deviceName[i] = String.format("%s (%s)", name, deviceList[i].getAddress());
+        }
+        return deviceName;
+    }
+
+    public static void updatePairedDeviceList() {
+//        Log.d(TAG, "updatePairedDevice()");
+        deviceList = getPairedDevice(adapter);
+    }
+
+    public static boolean connect(String address) {
+        Log.d(TAG, String.format("connect() ... mac: %s", address));
+        socket = getSocket(getDevice(adapter, address));
+        if (socket == null) {
+            return false;
+        }
+        adapter.cancelDiscovery();
+        try {
+            // Connect to the remote device through the socket
+            socket.connect();
+            inputStream = socket.getInputStream();
+            outputStream = socket.getOutputStream();
+        } catch (IOException connectException) {
+            // Unable to connect; close the socket and return
+            try {
+                socket.close();
+                Log.d(TAG, "connect() ... failed");
+            } catch (IOException e) {
+                Log.e(TAG, "connect() ... failed ... could not open the client socket", e);
+            }
+            return false;
+        }
+        return true;
+    }
+
+    public static boolean isConnected() {
+        return connectStatus;
+    }
+
+    public static boolean disconnect() {
+        Log.d(TAG, String.format("disconnect() ... mac: %s", device.getAddress()));
+        try {
+            socket.close();
+        } catch (IOException e) {
+            Log.e(TAG, "disconnect() ... failed ... could not close the client socket", e);
+            return false;
+        }
+        return true;
+    }
+
+    public static final int DISCONNECT_FAILED   = -2;   // disconnect
+    public static final int DISCONNECTED        = -1;   // disconnect
+    public static final int UNCHANE             =  0;   // do nothing
+    public static final int CONNECTED           =  1;   // connect
+    public static final int CONNECT_FAILED      =  2;   // disconnect
+    public static int select(int index) {
+        int state = UNCHANE;
+        if ((index > 0) && (index <= deviceList.length)) {
+            // connect
+            device = deviceList[index - 1];
+            if (!connectStatus) {
+                connectStatus = connect(device.getAddress());
+                if (connectStatus) {
+                    state = CONNECTED;
+                } else {
+                    state = CONNECT_FAILED;
+                }
+            } else {
+                state = UNCHANE;
+            }
+        } else {
+            // disconnect
+            if (connectStatus) {
+                connectStatus = false;
+                if (disconnect()) {
+                    state = DISCONNECTED;
+                } else {
+                    state = DISCONNECT_FAILED;
+                }
+            }
+        }
+        return state;
+    }
+
+    public static int send(byte[] data) {
+        Log.d(TAG, "send()");
+        try {
+            outputStream.write(data);
+        } catch (IOException e) {
+            Log.e(TAG, "OutputStream write() method failed", e);
+        }
+        return data.length;
+    }
+
+    public static byte[] receive() {
+        try {
+            int bytesAvailable = inputStream.available();
+            if (bytesAvailable > 0) {
+                byte[] receiveBytes = new byte[bytesAvailable];
+                if (inputStream.read(receiveBytes) != -1) {
+                    return receiveBytes;
+                }
+            }
+        } catch (IOException e) {
+            Log.e(TAG, "InputStream read() method failed", e);
+            return null;
+        }
+        return new byte[0];
+    }
+
+    public static Menu updateDeviceMenu(Menu menu) {
+        updatePairedDeviceList();
+        menu.clear();
+        menu.add(0, 0, 0, "Disconnect");
+        String[] deviceName = getDeviceName();
+        for (int i = 1; i <= deviceName.length; i++) {
+            menu.add(0, i, i, deviceName[i - 1]);
+        }
+        return menu;
+    }
+
+}