andriod TV 获取已连接蓝牙遥控器电池电量总结

因项目需求的需要，需要实现android TV 机顶盒连接成功的蓝牙遥控器的低电量提醒。根据需求，要先获得已连接的蓝牙设备的电量，再根据电量的值做判断提醒用户。

下面直接看代码，本项目中一共有三个类，初始MainActivity,MyBroadcastReceiver,MyService.其中，MainActivity不做任何修改，MyBroadcastReceiver监听开机完成广播，启动服务MyService，读取电量以及提醒的功能全都在服务中实现。

MyBroadcastReceiver类：

public class MyBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {Log.d("aaa" , "Boot Completeed .");Intent service = new Intent(context,MyService.class);context.startService(service);}
}

MyService类：

public class MyService extends Service {private static final boolean DEBUG = false;private static final String TAG = "aaa";public static Context context;BluetoothDevice mDevice;BluetoothGatt mBluetoothGatt;IntentFilter filter ;private static final UUID GATT_BATTERY_SERVICE_UUID =UUID.fromString("0000180f-0000-1000-8000-00805f9b34fb");private static final UUID GATT_BATTERY_LEVEL_CHARACTERISTIC_UUID =UUID.fromString("00002a19-0000-1000-8000-00805f9b34fb");private static final String KEY_BATTERY = "battery";private Handler handler;@Overridepublic void onCreate() {Log.d("aaa" , "service created.");handler = new Handler();context = getApplicationContext();super.onCreate();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Log.d("aaa" , "service is running.");filter = new IntentFilter();filter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);registerReceiver(broadcastReceiver,filter);return super.onStartCommand(intent,flags,startId);}BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {if(intent.getAction().equals(BluetoothDevice.ACTION_ACL_CONNECTED)){mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);Log.d("aaa" , "Device's name is :"+mDevice.getName());mBluetoothGatt = mDevice.connectGatt(context,true,mGattCallback);}if (intent.getAction().equals(BluetoothDevice.ACTION_ACL_DISCONNECTED)){Log.d("aaa" , "Device is disConected.");mBluetoothGatt.close();}}};private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {@Overridepublic void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {//Toast.makeText(MyService.this,"the pross is going to callback Fucktion",Toast.LENGTH_LONG).show();Log.d("aaa" , "the pross is going to callback Fucktion :");Log.d("aaa" , "status is :"+status);Log.d("aaa" , "newState is :"+newState);if (status == BluetoothGatt.GATT_SUCCESS && newState == BluetoothGatt.STATE_CONNECTED) {gatt.discoverServices();}}@Overridepublic void onServicesDiscovered(BluetoothGatt gatt, int status) {if (status != BluetoothGatt.GATT_SUCCESS) {if (DEBUG) {Log.e(TAG, "Service discovery failure on " + gatt);}return;}final BluetoothGattService battService = gatt.getService(GATT_BATTERY_SERVICE_UUID);if (battService == null) {if (DEBUG) {Log.d(TAG, "No battery service");}return;}final BluetoothGattCharacteristic battLevel =battService.getCharacteristic(GATT_BATTERY_LEVEL_CHARACTERISTIC_UUID);if (battLevel == null) {if (DEBUG) {Log.d(TAG, "No battery level");}return;}gatt.readCharacteristic(battLevel);}@Overridepublic void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {if (status != BluetoothGatt.GATT_SUCCESS) {if (DEBUG) {Log.e(TAG, "Read characteristic failure on " + gatt + " " + characteristic);}return;}if (GATT_BATTERY_LEVEL_CHARACTERISTIC_UUID.equals(characteristic.getUuid())) {final int batteryLevel =characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0);Log.d(TAG, "battery level is:"+batteryLevel);handler.post(new Runnable() {@Overridepublic void run() {if(batteryLevel >90)Toast.makeText(context,"The remote control has enough power",Toast.LENGTH_LONG).show();if(batteryLevel <10)Toast.makeText(context,"The remote control is low in power, please replace the battery as soon as possible.",Toast.LENGTH_LONG).show();}});}}};@Overridepublic void onDestroy() {Toast.makeText(this , "service is destory.",Toast.LENGTH_LONG).show();unregisterReceiver(broadcastReceiver);Log.d("aaa" , "Device is onDestory.");super.onDestroy();}@Nullable@Overridepublic IBinder onBind(Intent intent) {return null;}
}

manifest清单文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.mypeixun815"android:sharedUserId="android.uid.system"><uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/><uses-permission android:name="android.permission.BLUETOOTH"/><uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/><uses-feature android:name="android.hardware.bluetooth_le" android:required="true"></uses-feature><applicationandroid: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"><receiverandroid:name=".MyBroadcastReceiver"android:enabled="true"android:exported="true"><intent-filter><action android:name="android.intent.action.BOOT_COMPLETED"></action></intent-filter></receiver><serviceandroid:name=".MyService"android:enabled="true"android:exported="true" /><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>

在android 10.0系统中运行没有问题，最后不要忘记获得系统签名以及赋予apk 可读可执行的权限。

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andriod TV 获取已连接蓝牙遥控器电池电量总结

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