init commit

app/.gitignore

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

app/build.gradle

@@ -0,0 +1,30 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.2"
+    defaultConfig {
+        applicationId "tw.mingtsay.app.bluetoothconnector"
+        minSdkVersion 15
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test:runner:1.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}

app/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

app/src/androidTest/java/tw/mingtsay/app/bluetoothconnector/ExampleInstrumentedTest.java

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+package tw.mingtsay.app.bluetoothconnector;
+
+import android.content.Context;
+
+import androidx.test.InstrumentationRegistry;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("tw.mingtsay.app.bluetoothconnector", appContext.getPackageName());
+    }
+}

app/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="tw.mingtsay.app.bluetoothconnector">
+
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".ConnectActivity"></activity>
+        <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/tw/mingtsay/app/bluetoothconnector/ConnectActivity.java

@@ -0,0 +1,165 @@
+package tw.mingtsay.app.bluetoothconnector;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.bluetooth.BluetoothSocket;
+import android.os.Bundle;
+import android.view.KeyEvent;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.UUID;
+
+public class ConnectActivity extends AppCompatActivity {
+    //private final UUID uuid = UUID.fromString("8c4102d5-f0f9-4958-806e-7ba5fd54ce7c");
+    private final UUID serialPortUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
+
+    private String name, address;
+
+    private Button buttonConnect, buttonDisconnect, buttonSend;
+    private EditText textInput;
+    private TextView textContent;
+
+    private BluetoothAdapter bluetoothAdapter;
+    private BluetoothSocket socket;
+    private InputStream inputStream;
+    private OutputStream outputStream;
+
+    private Thread reader = new Thread(new Runnable() {
+        @Override
+        public void run() {
+            readerStop = false;
+            while (!readerStop) {
+                read();
+
+                try {
+                    Thread.sleep(200);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    });
+    private boolean readerStop;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_connect);
+
+        final String deviceName = getIntent().getStringExtra("DeviceName");
+        final String deviceAddress = getIntent().getStringExtra("DeviceAddress");
+
+        name = deviceName != null ? deviceName : "裝置名稱未顯示";
+        address = deviceAddress;
+
+        setTitle(String.format("%s (%s)", address, name));
+
+        buttonConnect = findViewById(R.id.buttonConnect);
+        buttonDisconnect = findViewById(R.id.buttonDisconnect);
+        buttonSend = findViewById(R.id.buttonSend);
+        textInput = findViewById(R.id.textInput);
+        textContent = findViewById(R.id.textContent);
+
+        buttonConnect.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                connect();
+            }
+        });
+
+        buttonDisconnect.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                disconnect();
+            }
+        });
+
+        buttonSend.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                send();
+            }
+        });
+
+        textInput.setOnEditorActionListener(new TextView.OnEditorActionListener() {
+            @Override
+            public boolean onEditorAction(TextView view, int actionId, KeyEvent event) {
+                send();
+                return false;
+            }
+        });
+
+        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        readerStop = true;
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        reader.start();
+    }
+
+    private void connect() {
+        final BluetoothDevice device = bluetoothAdapter.getRemoteDevice(address);
+
+        try {
+            socket = device.createRfcommSocketToServiceRecord(serialPortUUID);
+            socket.connect();
+            inputStream = socket.getInputStream();
+            outputStream = socket.getOutputStream();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void disconnect() {
+        if (socket == null) return;
+
+        try {
+            socket.close();
+            socket = null;
+            inputStream = null;
+            outputStream = null;
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void send() {
+        if (outputStream == null) return;
+
+        try {
+            outputStream.write(textInput.getText().toString().getBytes());
+            outputStream.flush();
+
+            textInput.setText("");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void read() {
+        if (inputStream == null) return;
+
+        try {
+            if (inputStream.available() <= 0) return;
+            byte[] buffer = new byte[256];
+            textContent.append(new String(buffer, 0, inputStream.read(buffer)));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

app/src/main/java/tw/mingtsay/app/bluetoothconnector/MainActivity.java

@@ -0,0 +1,222 @@
+package tw.mingtsay.app.bluetoothconnector;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+import androidx.recyclerview.widget.DividerItemDecoration;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class MainActivity extends AppCompatActivity {
+    private BluetoothAdapter bluetoothAdapter;
+    private final Set<BluetoothDevice> discoveredDevices = new HashSet<>();
+
+    private RecyclerViewAdapter recyclerViewAdapter;
+
+    private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            final String action = intent.getAction();
+
+            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
+                final BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
+                if (device == null) return;
+
+                Log.d("onReceive", device.getName() + ":" + device.getAddress());
+
+                discoveredDevices.add(device);
+                updateList();
+            } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
+                stopDiscovery();
+            }
+        }
+    };
+
+    private Button buttonDiscovery;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
+        layoutManager.setOrientation(RecyclerView.VERTICAL);
+
+        final DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, layoutManager.getOrientation());
+
+
+        recyclerViewAdapter = new RecyclerViewAdapter();
+
+        RecyclerView recyclerView = findViewById(R.id.recyclerView);
+        recyclerView.setLayoutManager(layoutManager);
+        recyclerView.setAdapter(recyclerViewAdapter);
+        recyclerView.addItemDecoration(dividerItemDecoration);
+
+        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+        if (bluetoothAdapter == null) {
+            new AlertDialog.Builder(this)
+                    .setTitle("本裝置不支援藍芽功能")
+                    .setCancelable(false)
+                    .setMessage("本裝置不支援藍芽功能，程式即將結束。")
+                    .setNeutralButton("結束", new DialogInterface.OnClickListener() {
+                        @Override
+                        public void onClick(DialogInterface dialogInterface, int i) {
+                            finish();
+                        }
+                    })
+                    .show();
+        }
+
+        buttonDiscovery = findViewById(R.id.buttonDiscovery);
+        buttonDiscovery.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                if (PackageManager.PERMISSION_GRANTED != ContextCompat.checkSelfPermission(MainActivity.this, "android.permission.ACCESS_COARSE_LOCATION")) {
+                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{"android.permission.ACCESS_COARSE_LOCATION"}, 0);
+                    return;
+                }
+
+                if (!bluetoothAdapter.isEnabled()) {
+                    Intent intentBluetoothEnable = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
+                    startActivity(intentBluetoothEnable);
+                    return;
+                }
+
+                discoverDevices();
+            }
+        });
+
+        final IntentFilter filter = new IntentFilter();
+        filter.addAction(BluetoothDevice.ACTION_FOUND);
+        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
+
+        registerReceiver(broadcastReceiver, filter);
+
+        updateList();
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+
+        unregisterReceiver(broadcastReceiver);
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        stopDiscovery();
+    }
+
+    private void startDiscovery() {
+        bluetoothAdapter.startDiscovery();
+        buttonDiscovery.setText("正在搜尋藍芽裝置…");
+    }
+
+    private void stopDiscovery() {
+        if (bluetoothAdapter.isDiscovering()) {
+            bluetoothAdapter.cancelDiscovery();
+        }
+        buttonDiscovery.setText("搜尋附近的藍芽裝置");
+    }
+
+    private void discoverDevices() {
+        stopDiscovery();
+
+        discoveredDevices.clear();
+        updateList();
+
+        startDiscovery();
+    }
+
+    private void updateList() {
+        recyclerViewAdapter.notifyDataSetChanged();
+    }
+
+    private class RecyclerViewHolder extends RecyclerView.ViewHolder {
+        private ImageView icon;
+        private TextView textName, textAddress;
+        private BluetoothDevice device;
+        private boolean isPaired;
+
+        RecyclerViewHolder(@NonNull View itemView) {
+            super(itemView);
+
+            icon = itemView.findViewById(R.id.icon);
+            textName = itemView.findViewById(R.id.textName);
+            textAddress = itemView.findViewById(R.id.textAddress);
+
+            itemView.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View view) {
+                    stopDiscovery();
+
+                    Intent intent = new Intent(MainActivity.this, ConnectActivity.class);
+                    intent.putExtra("DeviceName", device.getName());
+                    intent.putExtra("DeviceAddress", device.getAddress());
+
+                    startActivity(intent);
+                }
+            });
+        }
+
+        void loadDevice(@NonNull BluetoothDevice device, boolean isPaired) {
+            this.device = device;
+            this.isPaired = isPaired;
+
+            String name = this.device.getName();
+            if (name == null) name = "裝置名稱未顯示";
+
+            icon.setImageResource(this.isPaired ? R.drawable.ic_bluetooth_black_24dp : R.drawable.ic_bluetooth_searching_black_24dp);
+            textName.setText(name);
+            textAddress.setText(this.device.getAddress());
+        }
+    }
+
+    private class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolder> {
+        @NonNull
+        @Override
+        public RecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.bluetooth_device_item, parent, false);
+            return new RecyclerViewHolder(view);
+        }
+
+        @Override
+        public void onBindViewHolder(@NonNull RecyclerViewHolder holder, int position) {
+            Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
+            if (position < pairedDevices.size()) {
+                holder.loadDevice(pairedDevices.toArray(new BluetoothDevice[0])[position], true);
+            } else {
+                holder.loadDevice(discoveredDevices.toArray(new BluetoothDevice[0])[position - pairedDevices.size()], false);
+            }
+        }
+
+        @Override
+        public int getItemCount() {
+            return bluetoothAdapter.getBondedDevices().size() + discoveredDevices.size();
+        }
+    }
+
+}

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

app/src/main/res/drawable/ic_bluetooth_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M17.71,7.71L12,2h-1v7.59L6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 11,14.41L11,22h1l5.71,-5.71 -4.3,-4.29 4.3,-4.29zM13,5.83l1.88,1.88L13,9.59L13,5.83zM14.88,16.29L13,18.17v-3.76l1.88,1.88z"/>
+</vector>

app/src/main/res/drawable/ic_bluetooth_searching_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M14.24,12.01l2.32,2.32c0.28,-0.72 0.44,-1.51 0.44,-2.33 0,-0.82 -0.16,-1.59 -0.43,-2.31l-2.33,2.32zM19.53,6.71l-1.26,1.26c0.63,1.21 0.98,2.57 0.98,4.02s-0.36,2.82 -0.98,4.02l1.2,1.2c0.97,-1.54 1.54,-3.36 1.54,-5.31 -0.01,-1.89 -0.55,-3.67 -1.48,-5.19zM15.71,7.71L10,2L9,2v7.59L4.41,5 3,6.41 8.59,12 3,17.59 4.41,19 9,14.41L9,22h1l5.71,-5.71 -4.3,-4.29 4.3,-4.29zM11,5.83l1.88,1.88L11,9.59L11,5.83zM12.88,16.29L11,18.17v-3.76l1.88,1.88z"/>
+</vector>

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

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#008577"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

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

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:padding="16dp"
+    tools:context=".ConnectActivity">
+
+    <Button
+        android:id="@+id/buttonConnect"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="連線至藍芽裝置的序列埠"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toLeftOf="@id/buttonDisconnect"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/buttonDisconnect"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="中斷連線"
+        app:layout_constraintLeft_toRightOf="@id/buttonConnect"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <EditText
+        android:id="@+id/textInput"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:focusedByDefault="true"
+        android:imeOptions="actionSend"
+        app:layout_constraintBottom_toBottomOf="@id/buttonSend"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toLeftOf="@id/buttonSend"
+        app:layout_constraintTop_toTopOf="@id/buttonSend" />
+
+    <Button
+        android:id="@+id/buttonSend"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="送出"
+        app:layout_constraintLeft_toLeftOf="@id/buttonDisconnect"
+        app:layout_constraintRight_toRightOf="@id/buttonDisconnect"
+        app:layout_constraintTop_toBottomOf="@id/buttonDisconnect" />
+
+    <TextView
+        android:id="@+id/textContent"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/buttonSend" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <Button
+        android:id="@+id/buttonDiscovery"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="16dp"
+        android:text="搜尋附近的藍芽裝置"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/recyclerView"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/buttonDiscovery"
+        tools:listitem="@layout/bluetooth_device_item" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?android:attr/selectableItemBackground"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <ImageView
+        android:id="@+id/icon"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        app:layout_constraintBottom_toBottomOf="@id/textAddress"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toLeftOf="@id/textName"
+        app:layout_constraintTop_toTopOf="@id/textName"
+        tools:src="@drawable/ic_bluetooth_black_24dp" />
+
+    <TextView
+        android:id="@+id/textName"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
+        android:textColor="@android:color/primary_text_light"
+        app:layout_constraintLeft_toRightOf="@id/icon"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="裝置名稱" />
+
+    <TextView
+        android:id="@+id/textAddress"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Small"
+        android:textColor="@android:color/secondary_text_light"
+        app:layout_constraintLeft_toLeftOf="@id/textName"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/textName"
+        tools:text="裝置位址" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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="@drawable/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="@drawable/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">#008577</color>
+    <color name="colorPrimaryDark">#00574B</color>
+    <color name="colorAccent">#D81B60</color>
+</resources>

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

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Bluetooth Connector</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/tw/mingtsay/app/bluetoothconnector/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package tw.mingtsay.app.bluetoothconnector;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}