Add first code snippets for bluetoothle

.gitignore

@@ -9,3 +9,5 @@
 /build
 /captures
 .externalNativeBuild
+.idea/*
+/.idea/*

bluetoothle/.gitignore

@@ -0,0 +1 @@
+/build

bluetoothle/build.gradle

@@ -0,0 +1,36 @@
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.3"
+
+    defaultConfig {
+        minSdkVersion 23
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'consumer-rules.pro'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

bluetoothle/proguard-rules.pro

@@ -0,0 +1,21 @@
+# 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

bluetoothle/src/main/AndroidManifest.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.sample.android.bluetoothle">
+
+    <application>
+        <activity android:name=".kotlin.MainActivity"></activity>
+        <activity android:name=".java.DeviceScanActivity" />
+        <activity android:name=".java.MainActivity" />
+    </application>
+    <!--
+ If your app targets Android 9 or lower, you can declare
+         ACCESS_COARSE_LOCATION instead.
+    -->
+    <uses-feature
+        android:name="android.hardware.bluetooth_le"
+        android:required="true" />
+    <!--
+ This declares that this app is only available for devices that support Bluetooth Low
+    Energy.
+    -->
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+
+</manifest>

bluetoothle/src/main/java/com/sample/android/bluetoothle/java/DeviceScanActivity.java

@@ -0,0 +1,57 @@
+package com.sample.android.bluetoothle.java;
+
+import android.app.ListActivity;
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.le.BluetoothLeScanner;
+import android.bluetooth.le.ScanCallback;
+import android.bluetooth.le.ScanResult;
+import android.os.Handler;
+
+/**
+ * Activity for scanning and displaying available BLE devices.
+ */
+public class DeviceScanActivity extends ListActivity {
+    // [START process_scan_result]
+    private LeDeviceListAdapter leDeviceListAdapter;
+
+    // Device scan callback.
+    private ScanCallback leScanCallback =
+            new ScanCallback() {
+                @Override
+                public void onScanResult(int callbackType, ScanResult result) {
+                    super.onScanResult(callbackType, result);
+                    leDeviceListAdapter.addDevice(result.getDevice());
+                    leDeviceListAdapter.notifyDataSetChanged();
+                }
+            };
+    // [END process_scan_result]
+
+    // [START start_and_stop_scan]
+    private BluetoothLeScanner bluetoothLeScanner =
+            BluetoothAdapter.getDefaultAdapter().getBluetoothLeScanner();
+    private boolean mScanning;
+    private Handler handler = new Handler();
+
+    // Stops scanning after 10 seconds.
+    private static final long SCAN_PERIOD = 10000;
+
+    private void scanLeDevice() {
+        if (!mScanning) {
+            // Stops scanning after a pre-defined scan period.
+            handler.postDelayed(new Runnable() {
+                @Override
+                public void run() {
+                    mScanning = false;
+                    bluetoothLeScanner.stopScan(leScanCallback);
+                }
+            }, SCAN_PERIOD);
+
+            mScanning = true;
+            bluetoothLeScanner.startScan(leScanCallback);
+        } else {
+            mScanning = false;
+            bluetoothLeScanner.stopScan(leScanCallback);
+        }
+    }
+    // [END start_and_stop_scan]
+}

bluetoothle/src/main/java/com/sample/android/bluetoothle/java/LeDeviceListAdapter.java

@@ -0,0 +1,18 @@
+package com.sample.android.bluetoothle.java;
+
+import android.bluetooth.BluetoothClass;
+import android.bluetooth.BluetoothDevice;
+import android.content.Context;
+import android.widget.ArrayAdapter;
+
+public class LeDeviceListAdapter extends ArrayAdapter<BluetoothClass.Device> {
+
+    public LeDeviceListAdapter(Context context, int layout) {
+        super(context, layout);
+    }
+
+    public void addDevice(BluetoothDevice device) {
+        // This is where you can add devices to the adapter to show a list of discovered
+        // devices in the UI.
+    }
+}