Android 后台服务不工作
在这里，我为获取当前GPS位置和显示创建了后台服务。但当我尝试上面的代码时，我得到了以下错误。但问题是，当我在Android选项卡上尝试时，它工作正常，但当我在Huwavi选项卡上尝试时，它给出了愚蠢的错误Android 后台服务不工作,android,Android,在这里，我为获取当前GPS位置和显示创建了后台服务。但当我尝试上面的代码时，我得到了以下错误。但问题是，当我在Android选项卡上尝试时，它工作正常，但当我在Huwavi选项卡上尝试时，它给出了愚蠢的错误 public class MyService extends BackgroundService implements LocationListener { private final static String TAG = MyService.class.getS
public class MyService extends BackgroundService implements LocationListener {
private final static String TAG = MyService.class.getSimpleName();
private String mHelloTo = "World";
private LocationManager locationManager;
private String provider;
Context context;
String username;
CommentsDataSource datasource;
@Override
public void onCreate() {
context = getApplicationContext();
datasource = new CommentsDataSource(context);
datasource.open();
mHelloTo = datasource.getComment_1();
}
@Override
public void onDestroy() {
//datasource.close();
}
protected JSONObject doWork() {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
int level=0;
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
Double latitude = location.getLatitude();
Double longitude = location.getLongitude();
if (location != null) {
Log.i("Provider", provider + " has been selected.");
onLocationChanged(location);
}
JSONObject result = new JSONObject();
try {
String msg = "Kasun " + mHelloTo + " - its currently "
+ "3.456789";
result.put("Message", msg);
Log.d(TAG, msg);
} catch (JSONException e) {
}
return result;
}
public void onLocationChanged(Location location) {
Double latitude = location.getLatitude();
Double longitude = location.getLongitude();
}
}
请使用此服务： 格拉德尔 启动服务 服务等级
公共类ServiceLocation扩展服务实现
GoogleAppClient.ConnectionCallbacks，
GoogleAppClient.OnConnectionFailedListener，
位置侦听器{
私有静态最终字符串通知\u通道\u ID=“我的通知\u位置”；
私有静态最终长时间\u间隔\u获取\u位置=1000*5；//1分钟
私有静态最终长距离最小距离更改用于更新=7；//米
私有处理程序handlerSendLocation；
私有上下文；
私人GoogleapClient MGoogleapClient；
私人位置请求mLocationRequest；
专用最终静态int连接\u故障\u解决\u请求=5000；
位置数据；
@凌驾
public void onCreate（）{
super.onCreate（）；
mgoogleapclient=新的Googleapclient.Builder（此）
.addConnectionCallbacks（此）
.addOnConnectionFailedListener（此）
.addApi（LocationServices.API）
.build（）；
//创建LocationRequest对象
mLocationRequest=LocationRequest.create（）
.setPriority（定位请求。优先级高精度）
.setInterval（时间间隔获取位置）//3秒，以毫秒为单位
.SetFastTestInterval（时间间隔获取位置）；//1秒，以毫秒为单位
mContext=这个；
NotificationCompat.Builder=新建NotificationCompat.Builder（此为通知通道ID）
.正在进行（错误）
.setSmallIcon（R.drawable.ic_通知）
.setColor（getResources（）.getColor（R.color.fontColorDarkGray））
.setPriority（通知.PRIORITY_MIN）；
if（Build.VERSION.SDK\u INT>=Build.VERSION\u code.O）{
NotificationManager NotificationManager=（NotificationManager）getSystemService（Context.NOTIFICATION\u服务）；
NotificationChannel NotificationChannel=新的NotificationChannel（通知通道ID，
通知（通道ID、通知管理器。重要性较低）；
notificationChannel.setDescription（通知通道ID）；
notificationChannel.setSound（null，null）；
notificationManager.createNotificationChannel（notificationChannel）；
startForeground（1，builder.build（））；
}
}
@凌驾
公共IBinder onBind（意图arg0）{
返回null；
}
@凌驾
公共int onStartCommand（Intent Intent、int标志、int startId）{
Log.w（“服务更新位置”，“BGS>已启动”）；
if（handlerSendLocation==null）{
handlerSendLocation=新处理程序（）；
handlerSendLocation.post（runnableSendLocation）；
Log.w（“服务发送位置”，“BGS>handlerSendLocation已初始化”）；
}否则{
Log.w（“服务发送位置”，“BGS>handlerSendLocation已初始化”）；
}
返回开始时间；
}
private Runnable runnableSendLocation=new Runnable（）{
@凌驾
公开募捐{
//你可以找到位置
//位置数据
Log.w（“==>UpdateLocation>Location Updated”）；
if（handlerSendLocation！=null&&runnableSendLocation！=null）
handlerSendLocation.postDelayed（runnableSendLocation，时间间隔获取位置）；
}
};
@凌驾
未连接的公共无效（@Nullable Bundle）{
if（ActivityCompat.checkSelfPermission（mContext、Manifest.permission.ACCESS\u FINE\u LOCATION）！=PackageManager.permission\u已授予&&
ActivityCompat.checkSelfPermission（mContext、Manifest.permission.ACCESS\u位置）！=PackageManager.permission\u已授予）{
回来
}
Location Location=LocationServices.FusedLocationApi.getLastLocation（mgoogleapClient）；
LocationServices.FusedLocationApi.RequestLocationUpdate（mgoogleapClient、mlLocationRequest、this）；
}
@凌驾
公共空间连接暂停（int i）{
}
@凌驾
public void onconnection失败（@NonNull ConnectionResult ConnectionResult）{
if（connectionResult.hasResolution（）&&mContext活动实例）{
试一试{
活动活动=（活动）mContext；
connectionResult.StartResult解决方案（活动、连接失败、解决请求）；
}捕获（例外e）{
e、 printStackTrace（）；
}
}否则{
Log.i（“，”位置服务连接失败，代码为“+connectionResult.getErrorCode（））；
}
}
@凌驾
已更改位置上的公共无效（位置）{
Log.w（“==>UpdateLocation已停止”）；
stopSelf（）；
super.ondestory（）；
}
}
12-26 14:41:04.651: I/BackgroundService(5356): Exception occurred during doWork()
12-26 14:41:04.651: I/BackgroundService(5356): java.lang.NullPointerException
12-26 14:41:04.651: I/BackgroundService(5356): at org.apache.cordova.example.MyService.doWork(MyService.java:84)
12-26 14:41:04.651: I/BackgroundService(5356): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.doWorkWrapper(BackgroundService.java:390)
implementation 'com.google.android.gms:play-services:12.0.1'
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
ContextCompat.startForegroundService(MainActivity.this, new Intent(MainActivity.this, ServiceLocation.class));
} else {
startService(new Intent(MainActivity.this, ServiceLocation.class));
}
public class ServiceLocation extends Service implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private static final String NOTIFICATION_CHANNEL_ID = "my_notification_location";
private static final long TIME_INTERVAL_GET_LOCATION = 1000 * 5; // 1 Minute
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 7; // meters
private Handler handlerSendLocation;
private Context mContext;
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 5000;
Location locationData;
@Override
public void onCreate() {
super.onCreate();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
// Create the LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(TIME_INTERVAL_GET_LOCATION) // 3 seconds, in milliseconds
.setFastestInterval(TIME_INTERVAL_GET_LOCATION); // 1 second, in milliseconds
mContext = this;
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
.setOngoing(false)
.setSmallIcon(R.drawable.ic_notification)
.setColor(getResources().getColor(R.color.fontColorDarkGray))
.setPriority(Notification.PRIORITY_MIN);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID,
NOTIFICATION_CHANNEL_ID, NotificationManager.IMPORTANCE_LOW);
notificationChannel.setDescription(NOTIFICATION_CHANNEL_ID);
notificationChannel.setSound(null, null);
notificationManager.createNotificationChannel(notificationChannel);
startForeground(1, builder.build());
}
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.w("Service Update Location", "BGS > Started");
if (handlerSendLocation == null) {
handlerSendLocation = new Handler();
handlerSendLocation.post(runnableSendLocation);
Log.w("Service Send Location", "BGS > handlerSendLocation Initialized");
} else {
Log.w("Service Send Location", "BGS > handlerSendLocation Already Initialized");
}
return START_STICKY;
}
private Runnable runnableSendLocation = new Runnable() {
@Override
public void run() {
// You can get Location
//locationData
Log.w("==>UpdateLocation<==", "" + String.format("%.6f", locationData.getLatitude()) + "," +
String.format("%.6f", locationData.getLongitude()));
Log.w("Service Send Location", "BGS >> Location Updated");
if (handlerSendLocation != null && runnableSendLocation != null)
handlerSendLocation.postDelayed(runnableSendLocation, TIME_INTERVAL_GET_LOCATION);
}
};
@Override
public void onConnected(@Nullable Bundle bundle) {
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
if (connectionResult.hasResolution() && mContext instanceof Activity) {
try {
Activity activity = (Activity) mContext;
connectionResult.startResolutionForResult(activity, CONNECTION_FAILURE_RESOLUTION_REQUEST);
} catch (Exception e) {
e.printStackTrace();
}
} else {
Log.i("", "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
@Override
public void onLocationChanged(Location location) {
Log.w("==>UpdateLocation<==", "" + String.format("%.6f", location.getLatitude()) + "," + String.format("%.6f", location.getLongitude()));
locationData = location;
}
@Override
public void onDestroy() {
if (handlerSendLocation != null)
handlerSendLocation.removeCallbacks(runnableSendLocation);
Log.w("Service Update Info", "BGS > Stopped");
stopSelf();
super.onDestroy();
}
}
<service
android:name=".ServiceLocation"
android:enabled="true"
android:exported="true" />