android - 即使在后台，如何使用蓝牙运行服务？
问题描述
我需要一项服务，该服务始终在运行，并且不时启动蓝牙发现。我看到了限制和谷歌文档并尝试了一些东西。就像乔布斯一样，但是，我不知道我是否做得正确，但我总是不得不重新安排工作，这让我的控制变量回到了初始状态。所以我尝试了下面的另一种方法：用户打开应用程序的那一刻，mainactivity 启动服务。
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
Log.d("TestService", "Inside_Method");
//JobServiceUtil.scheduleJob(getApplicationContext());
ContextCompat.startForegroundService(this, new Intent(getContext(), IntentServiceEm.class));
}
然后我的 IntentService 运行：
public class IntentServiceEm extends Service implements LocationListener {
...
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
//wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
// "IntentServiceEm:Wakelock");
//wakeLock.acquire();
Log.d(TAG, "Wakelock acquired");
mBluetoothAdapter = BluetoothMethods.returnBluetoothAdapter(this);
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
/* receiver = new MyBroadcastReceiverEm();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(receiver, filter);*/
startForengroundEm();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
receiver = new MyBroadcastReceiverEm();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(receiver, filter);
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
mBluetoothAdapter.startDiscovery();
return START_STICKY;
}
private void startForengroundEm() {
Log.d(TAG, "myOwnForeground BLE");
String NOTIFICATION_CHANNEL_ID = "channelID";
String channelName = "My Background Service BLE";
NotificationChannel chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_DEFAULT);
chan.setLightColor(Color.TRANSPARENT);
chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
assert manager != null;
manager.createNotificationChannel(chan);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
Notification notification = notificationBuilder.setOngoing(true)
.setSmallIcon(R.drawable.icon)
.setContentTitle("Foreground Notification")
.setPriority(NotificationManager.IMPORTANCE_DEFAULT)
.setCategory(Notification.CATEGORY_SERVICE)
.build();
startForeground(990, notification);
}
@Override
protected void onHandleIntent(@Nullable Intent intent) {
Log.d(TAG, "onHandleIntent");
// mBluetoothAdapter.startDiscovery();
//mBluetoothAdapter.startLeScan(leScanCallback);
Log.d(TAG, "startLeScan");
// mBluetoothAdapter.stopLeScan(leScanCallback);
}
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, "OnLocationChanged");
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
private void fn_getlocation() {
Log.d(TAG, "getLocation");
unregisterReceiver(receiver);
locationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
isGPSEnable = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnable = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(firstTime){
...
}
}
public class MyBroadcastReceiverEm extends BroadcastReceiver {
// private static final String TAG = "MyBroadcastReceiver";
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Discovery has found a device. Get the BluetoothDevice
// object and its info from the Intent.
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
if (deviceHardwareAddress.equals(SaveSharedPreferences.getMacDevice(IntentServiceEm.this))) {
mBluetoothAdapter.cancelDiscovery();
Log.d(TAG, "Inside IF Device: " + device.getAddress() + " Preferences: " + SaveSharedPreferences.getMacDevice(IntentServiceEm.this));
Log.d(TAG, "deviceIsEqualsPreferences");
fn_getlocation();
Log.d(TAG, "cancelDiscovery");
}
}
}
}
}
但是，我遇到了一些问题，服务只运行一次就无法继续，我怎样才能让它“永远”运行？
使用服务编辑代码，几乎相同：
public class IntentServiceEm extends Service implements LocationListener {
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
//wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
// "IntentServiceEm:Wakelock");
//wakeLock.acquire();
Log.d(TAG, "Wakelock acquired");
mBluetoothAdapter = BluetoothMethods.returnBluetoothAdapter(this);
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
/* receiver = new MyBroadcastReceiverEm();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(receiver, filter);*/
startForengroundEm();
Log.d(TAG,"startCommand");
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
receiver = new MyBroadcastReceiverEm();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(receiver, filter);
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
mBluetoothAdapter.startDiscovery();
return START_STICKY;
}
private void startForengroundEm() {
Log.d(TAG, "myOwnForeground BLE");
String NOTIFICATION_CHANNEL_ID = "app.app_app";
String channelName = "My Background Service BLE";
NotificationChannel chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_DEFAULT);
chan.setLightColor(Color.TRANSPARENT);
chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
assert manager != null;
manager.createNotificationChannel(chan);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
Notification notification = notificationBuilder.setOngoing(true)
.setSmallIcon(R.drawable.applogin)
.setContentTitle("app está te protegendo em segundo plano")
.setPriority(NotificationManager.IMPORTANCE_DEFAULT)
.setCategory(Notification.CATEGORY_SERVICE)
.build();
startForeground(990, notification);
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
mBluetoothAdapter.startDiscovery();
Log.d(TAG, "myOwnForeground BLE Discovery");
}
private void fn_getlocation() {
.....
}
public class MyBroadcastReceiverEm extends BroadcastReceiver {
// private static final String TAG = "MyBroadcastReceiver";
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Discovery has found a device. Get the BluetoothDevice
// object and its info from the Intent.
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
if (deviceHardwareAddress.equals(SaveSharedPreferences.getMacDevice(IntentServiceEm.this))) {
mBluetoothAdapter.cancelDiscovery();
Log.d(TAG, "Inside IF Device: " + device.getAddress() + " Preferences: " + SaveSharedPreferences.getMacDevice(IntentServiceEm.this));
Log.d(TAG, "deviceIsEqualsPreferences");
fn_getlocation();
Log.d(TAG, "cancelDiscovery");
}
}
}
}
}
解决方案
推荐阅读
- python - 在python中获取日志级别
- powerbi - 在 Power BI 中计算比率时加 1 时筛选器不起作用
- .net-core-3.0 - ListView clear() 防止显示新内容
- javascript - 有没有办法跳过在sails.js 应用程序中加载某些配置文件？
- reactjs - React 路由器 - #/ 被添加到查询参数中
- .net - 使用 .Net 解析 ISO 8601 时区 DateTime
- javascript - 如何正确传递道具以更改 JSON 文件中的键？
- javascript - 删除 PayPal Checkout 中的账单地址字段
- php - 在 laravel 项目之间移动用户表
- java - 我想用“\n”分割输入字符串