{"id":98,"date":"2021-07-19T15:55:18","date_gmt":"2021-07-19T06:55:18","guid":{"rendered":"https:\/\/www.avancesys.co.jp\/laboratory\/?post_type=article&p=98"},"modified":"2021-07-19T16:25:44","modified_gmt":"2021-07-19T07:25:44","slug":"%e7%ac%ac2%e5%9b%9e-%e9%a1%94%e8%aa%8d%e8%ad%98%e3%83%87%e3%83%90%e3%82%a4%e3%82%b9-android%e7%b7%a8-%e3%80%9c-jetpack%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%a6viewmodel%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99","status":"publish","type":"article","link":"https:\/\/www.avancesys.co.jp\/laboratory\/article\/%e7%ac%ac2%e5%9b%9e-%e9%a1%94%e8%aa%8d%e8%ad%98%e3%83%87%e3%83%90%e3%82%a4%e3%82%b9-android%e7%b7%a8-%e3%80%9c-jetpack%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%a6viewmodel%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99\/","title":{"rendered":"\u7b2c2\u56de \u9854\u8a8d\u8b58\u30c7\u30d0\u30a4\u30b9 Android\u7de8 \u301c JetPack\u3092\u4f7f\u3063\u3066ViewModel\u3092\u5b9f\u88c5\u3059\u308b \u301c"},"content":{"rendered":"\n

\u6700\u8fd1\u306eAndroid\u30a2\u30d7\u30ea\u306fJetPack\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u6d78\u900f\u3057\u3066\u304d\u305f\u3053\u3068\u3082\u3042\u308a\u3001MVVM\u3092\u4f7f\u3046\u3053\u3068\u306f\u5f53\u305f\u308a\u524d\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3088\u306d\u3002<\/p>\n\n\n\n

\u305d\u3053\u3067\u3001\u4eca\u56de\u306f\u3001\u30a2\u30d7\u30ea\u306eBluetooth\u63a5\u7d9a\u753b\u9762\u3092ViewModel + Coroutine + Lifecycle\u3092\u4f7f\u3063\u3066\u3001MVVM\u8a2d\u8a08\u306b\u3057\u3066\u307f\u3088\u3046\u3068\u601d\u3044\u307e\u3059\uff01<\/p>\n\n\n\n

MVVM\u3068\u306f? – Wikipedia\u53c2\u7167<\/a><\/p>\n\n\n\n

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\u65e2\u5b58\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/p><\/blockquote><\/figure>\n\n\n\n

\u4e0b\u8a18\u306fBluetooth\u901a\u4fe1\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u30fc\u3084\u30dc\u30bf\u30f3\u72b6\u614b\u5909\u5316\u3082\u542b\u3081\u305f\u65e2\u5b58\u30b3\u30fc\u30c9\u3067\u3059\u3002\u3053\u3053\u304b\u3089\u51e6\u7406\u3092\u5206\u96e2\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

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class ConnectActivity : BaseActivity(), ISppClient {\n\n    private lateinit var deviceAdapter: ArrayAdapter<String>\n    private var btDeviceSet: Set<BluetoothDevice>? = null\n    private var btDevice: BluetoothDevice? = null\n\n    override fun onCreate(savedInstanceState: Bundle?) {\n        super.onCreate(savedInstanceState)\n        setContentView(R.layout.activity_connect)\n\n        supportActionBar?.setDisplayHomeAsUpEnabled(true)\n\n        MyApplication.instance.sppClient.addListener(this)\n\n        deviceAdapter = ArrayAdapter(this,\n            R.layout.spinner_item\n        )\n        deviceAdapter.setDropDownViewResource(R.layout.spinner_dropdown_item)\n        spinnerDevices.adapter = deviceAdapter\n\n        buttonConnect.setOnClickListener {\n            MyApplication.instance.sppClient.connect(btDevice)\n        }\n\n        buttonDisconnect.setOnClickListener {\n            MyApplication.instance.sppClient.disconnect()\n        }\n    }\n\n    override fun onResume() {\n        super.onResume()\n\n        \/\/ \u63a5\u7d9a\u4e2d\u306e\u5834\u5408\u306f\u305d\u306e\u30c7\u30d0\u30a4\u30b9\u3092\u521d\u671f\u9078\u629e\u9805\u76ee\u306b\u3059\u308b\n        if (MyApplication.instance.sppClient.isConnected()) {\n            btDevice = MyApplication.instance.sppClient.mBTDevice\n        }\n\n        deviceAdapter.clear()\n\n        val btAdapter = BluetoothAdapter.getDefaultAdapter()\n        btDeviceSet = btAdapter.bondedDevices\n        if (btDeviceSet != null) {\n\n            var selectIndex = 0\n            var index = 0\n\n            for (device in btDeviceSet!!) {\n                deviceAdapter.add(device.name)\n\n                if (device.name.equals(btDevice?.name)) {\n                    selectIndex = index\n                }\n                index++\n            }\n\n            if (btDevice == null && btDeviceSet!!.size > 0) {\n                btDevice = btDeviceSet!!.first()\n                selectIndex = 0\n            }\n\n            if (btDevice != null && spinnerDevices.adapter.count > selectIndex) {\n                spinnerDevices.setSelection(selectIndex, false)\n            }\n        }\n\n        spinnerDevices.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {\n            override fun onItemSelected(p0: AdapterView<*>?, p1: View?, p2: Int, p3: Long) {\n                \/\/ \u30c7\u30d0\u30a4\u30b9\u5909\u66f4\u6642\u306b\u5207\u65ad\u3059\u308b\n                MyApplication.instance.sppClient.disconnect()\n\n                if (btDeviceSet != null) {\n                    val selectedName = deviceAdapter.getItem(p2)\n                    for (device in btDeviceSet!!) {\n                        if (device.name.equals(selectedName)) {\n                            btDevice = device\n                            break\n                        }\n                    }\n                }\n            }\n\n            override fun onNothingSelected(p0: AdapterView<*>?) {\n            }\n        }\n\n        updateButtonState()\n    }\n\n    fun updateButtonState() {\n        if (MyApplication.instance.sppClient.isConnected()) {\n            buttonConnect.isEnabled = false\n            buttonDisconnect.isEnabled = true\n        } else {\n            buttonDisconnect.isEnabled = false\n            buttonConnect.isEnabled = (btDevice != null)\n        }\n    }\n\n    override fun onConnected(result: Boolean) {\n        runOnUiThread {\n            if (isRunning) {\n                if (result) {\n                    Toast.makeText(this, "\u63a5\u7d9a\u6210\u529f", Toast.LENGTH_SHORT).show()\n                } else {\n                    Toast.makeText(this, "\u63a5\u7d9a\u5931\u6557", Toast.LENGTH_SHORT).show()\n                }\n\n                updateButtonState()\n            }\n        }\n    }\n\n    override fun onDisconnected() {\n        runOnUiThread {\n            if (isRunning) {\n                Toast.makeText(this, "\u63a5\u7d9a\u5207\u65ad", Toast.LENGTH_SHORT).show()\n                updateButtonState()\n            }\n        }\n    }\n}<\/code><\/pre><\/div>\n\n\n\n
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1. \u6e96\u5099<\/p><\/blockquote><\/figure>\n\n\n\n
Coroutine, Lifecycle \u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
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buid.gradle(app)<\/strong><\/p>\n\n\n\n
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apply plugin: 'com.android.application'\napply plugin: 'kotlin-android'\napply plugin: 'kotlin-android-extensions'\napply plugin: 'kotlin-kapt' \/\/ \u8ffd\u52a0\n\nandroid {\n    ...\n\n    \/\/ \u8ffd\u52a0\n    compileOptions {\n        sourceCompatibility JavaVersion.VERSION_1_8\n        targetCompatibility JavaVersion.VERSION_1_8\n    }\n\n    \/\/ \u8ffd\u52a0\n    kotlinOptions {\n        jvmTarget = '1.8'\n    }\n\n    dependencies {\n        ...\n        \/\/ lifecycle \u8ffd\u52a0\n        implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"\n        implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"\n        implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"\n\n        \/\/ coroutine \u8ffd\u52a0\n        implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version"\n        implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines_version"\n    }\n}<\/code><\/pre><\/div>\n\n\n\n
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2. ViewModel\u306e\u5b9f\u88c5<\/p><\/blockquote><\/figure>\n\n\n\n
Bluetooth\u63a5\u7d9a\u753b\u9762\u3067\u306f\u30da\u30a2\u30ea\u30f3\u30b0\u3057\u305f\u30c7\u30d0\u30a4\u30b9\u306e\u30b9\u30d4\u30ca\u30fc\u8868\u793a\u3068\u63a5\u7d9a\u3001\u5207\u65ad\u30dc\u30bf\u30f3\u306e\u30a4\u30d9\u30f3\u30c8\u304c\u5b58\u5728\u3059\u308b\u305f\u3081\u3001\u3053\u308c\u3089\u306e\u51e6\u7406\u3092ViewModel\u3078\u8a18\u8ff0\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
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ConnectViewModel.kt<\/strong><\/p>\n\n\n\n
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class ConnectViewModel(val app: Application) : AndroidViewModel(app) {\n\n    private var mBtDeviceSet: Set<BluetoothDevice>? = null      \/\/ \u30da\u30a2\u30ea\u30f3\u30b0\u6e08\u307f\u306e\u30c7\u30d0\u30a4\u30b9\u4e00\u89a7\n    private var mBtDevice: BluetoothDevice? = null              \/\/ \u63a5\u7d9a\u4e2d\u306e\u30c7\u30d0\u30a4\u30b9\n\n    val deviceAdapter: ArrayAdapter<String> = ArrayAdapter(app, R.layout.spinner_item)\n    val btDeviceSet get() = mBtDeviceSet\n    val btDevice get() = mBtDevice\n\n    init {\n        deviceAdapter.setDropDownViewResource(R.layout.spinner_dropdown_item)\n    }\n\n    fun connectBtDevice() = MyApplication.instance.sppClient.connect(mBtDevice)\n\n    fun disconnectBtDevice() = MyApplication.instance.sppClient.disconnect()\n\n    val spinnerOnItemSelectedListener = object : SpinnerOnItemSelectedListener {\n        override var isSelectedFirst: Boolean = false\n\n        override fun onItemSelectedSpinner(\n            parent: AdapterView<*>?,\n            view: View?,\n            position: Int,\n            id: Long\n        ) {\n            \/\/ \u30c7\u30d0\u30a4\u30b9\u5909\u66f4\u6642\u306b\u5207\u65ad\u3059\u308b\n            MyApplication.instance.sppClient.disconnect()\n\n            if (mBtDeviceSet != null) {\n                val selectedName = deviceAdapter.getItem(position)\n                for (device in mBtDeviceSet!!) {\n                    if (device.name == selectedName) {\n                        mBtDevice = device\n                        break\n                    }\n                }\n            }\n        }\n\n        override fun onNothingSelected(parent: AdapterView<*>?) {\n        }\n    }\n\n    fun updateSpinner(callback: (selectIndex: Int) -> Unit) =\n        viewModelScope.launch {\n            var selectIndex = 0\n\n            \/\/ \u63a5\u7d9a\u4e2d\u306e\u5834\u5408\u306f\u305d\u306e\u30c7\u30d0\u30a4\u30b9\u3092\u521d\u671f\u9078\u629e\u9805\u76ee\u306b\u3059\u308b\n            if (MyApplication.instance.sppClient.isConnected()) {\n                mBtDevice = MyApplication.instance.sppClient.mBTDevice\n            }\n\n            deviceAdapter.clear()\n\n            val btAdapter = BluetoothAdapter.getDefaultAdapter()\n            \/\/ \u30da\u30a2\u30ea\u30f3\u30b0\u6e08\u307f\u306e\u30c7\u30d0\u30a4\u30b9\u3092\u53d6\u5f97\n            mBtDeviceSet = btAdapter.bondedDevices\n\n            mBtDeviceSet?.let { btSet ->\n                for ((index, device) in btSet.withIndex()) {\n                    deviceAdapter.add(device.name)\n\n                    if (device.name == mBtDevice?.name) {\n                        selectIndex = index\n                    }\n                }\n\n                if (btSet.isNotEmpty()) {\n                    mBtDevice = btSet.first()\n                    selectIndex = 0\n                }\n            }\n            callback(selectIndex)\n        }\n}<\/code><\/pre><\/div>\n\n\n\n
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\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
ViewModel\u3092\u4f5c\u6210\u3059\u308b\u969b\u306f\u3001ViewModel<\/mark>\u3082\u3057\u304f\u306fAndroidViewModel<\/mark>\u3092\u7d99\u627f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u4eca\u56de\u306fContext<\/mark>\u3092ViewModel\u3067\u4f7f\u7528\u3059\u308b\u305f\u3081\u3001AndroidViewModel\u3092\u7d99\u627f\u3057\u3066\u3044\u307e\u3059\u3002Context\u3092\u4f7f\u7528\u3057\u306a\u3044\u5834\u5408\u306fViewModel\u3067\u826f\u3044\u3067\u3059\u3002<\/p>\n\n\n\n
Activity\u3067\u3053\u308c\u307e\u3067\u7ba1\u7406\u3057\u3066\u3044\u305f\u4ee5\u4e0b\u306e\u8981\u7d20\u306f\u5168\u3066ViewModel\u3078\u79fb\u884c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n