屏幕关闭后无法接收LocationClient的位置更新 [英] Can't receive LocationClient's location updates after screen gone off
本文介绍了屏幕关闭后无法接收LocationClient的位置更新的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试编写一个简单的Android服务，该服务在后台运行并从LocationClient(Google Map API Android V2)接收位置更新.问题是，当屏幕关闭时，我的服务不再收到位置更新信息.我试图检查服务是否处于活动状态，即使关闭屏幕也是如此(我有一个TimerTask安排了日志).屏幕打开时，我可以接收位置更新，但是当屏幕关闭时，我只能看到TimerTask的日志，而我没有收到任何位置更新.唤醒屏幕会再次打开位置更新.该如何解决?
这是我的简单服务:
public class LocationService extends Service implements GooglePlayServicesClient.ConnectionCallbacks, GooglePlayServicesClient.OnConnectionFailedListener, LocationListener{
private static final String TAG = LocationService.class.getSimpleName();
private LocationClient mLocationClient;
private Timer timer;
private static final LocationRequest REQUEST = LocationRequest.create()
.setInterval(5*1000) // 5 seconds
.setFastestInterval(3*1000) // 3 seconds
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
@Override
public void onCreate() {
Log.d(TAG, "Creating..");
mLocationClient = new LocationClient(this, this, this);
timer = new Timer();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d(TAG, "Starting..");
if(!mLocationClient.isConnected() || !mLocationClient.isConnecting()) {
Log.d(TAG, "Connecting location client..");
mLocationClient.connect();
}
timer.scheduleAtFixedRate(new TimerTask(){
@Override
public void run() {
Log.d(TAG, "TimerTask executing");
}}, 0, 3*1000);
return START_STICKY;
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.d(TAG, "Connection failed..");
stopSelf();
}
@Override
public void onConnected(Bundle bundle) {
System.out.println("Connected ...");
mLocationClient.requestLocationUpdates(REQUEST, this);
}
@Override
public void onDisconnected() {
Log.d(TAG, "Disconnected..");
stopSelf();
}
@Override
public IBinder onBind(Intent arg0) {
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, "Received location update");
}
@Override
public void onDestroy() {
Log.d(TAG, "Destroying..");
timer.cancel();
mLocationClient.removeLocationUpdates(this);
}
}
解决方案
更新:-
首先，您需要在OnCreate()中定义LocationClient，这将调用onConnected()...
像这样定义您的locationClient.
locationClient = new LocationClient(this, this, this);
locationClient.connect();
现在在您的onConnected()中.只要求这样更新位置.
@Override
public void onConnectionFailed(ConnectionResult arg0) {
// TODO Auto-generated method stub
}
@Override
public void onConnected(Bundle arg0) {
src = locationClient.getLastLocation();
System.out.println("======================location 1==" + src);
LocationRequest lrequest = new LocationRequest();
lrequest.setInterval(0);
lrequest.setSmallestDisplacement(0);
lrequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationClient.requestLocationUpdates(lrequest, new LocationListener() {
@Override
public void onLocationChanged(Location arg0) {
System.out.println("======================location 1233==" +
arg0);
/*Toast.makeText(getApplicationContext(),
"Location is 12" + arg0.getLatitude(),
Toast.LENGTH_SHORT).show();*/
}
});
}
@Override
public void onDisconnected() {
// TODO Auto-generated method stub
}
*************** 在 ************ 之前
如果您主要关注的是不断找到您的位置更新，则U可以使用以下提及的内容.
使用此:::(这将根据GPS定期更新用户的位置)
For OnCreate()::
----------------------
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.speed);
initui();
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
provider = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
if(!provider){
String text = "ENABLE GPS TO ACCESS SPEEDO METER!";
Toast.makeText(Speedometer.this, text, Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
if (location != null) {
/*lat = (int) (location.getLatitude() * 1E6);
longi = (int)(location.getLongitude() * 1E6);*/
String text = "Got Coordinates";
Toast.makeText(Speedometer.this, text, Toast.LENGTH_SHORT).show();
}
//lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 2, this);
}
Now use onLocationChanged()
---------------------------
@Override
public void onLocationChanged(Location loc) {
// TODO Auto-generated method stub
float distance = 0;
//float prevDis = 0;
try{
if(prevLoc==null)
{
prevLoc = loc;
//Toast.makeText(MainActivity.this, "PrevLOC" + prevLoc, Toast.LENGTH_SHORT).show();
Log.i("Main Activity", "Prev LOC" + prevLoc);
}
else {
try{
Runtime r = Runtime.getRuntime();
r.gc();
}catch(Exception e){
e.printStackTrace();
}
// When prevLoc is not null
Log.i("Main Activity", "Prev LOC in new LOC BLAH BLAH BLAH" + prevLoc);
newLoc = loc;
//Toast.makeText(MainActivity.this, "NewLoc" + newLoc, Toast.LENGTH_SHORT).show();
Log.i("Main Activity", "New LOC" + newLoc);
distance = prevLoc.distanceTo(newLoc);
Log.i("Main Activity", "New DISTANCE DISTANCE DISTANCE DISTANCE DISTANCE DISTANCE " + distance);
distance = (float) (3.6*distance);
speed = distance;
prevLoc = newLoc;
Log.i("Main Activity", "New Coordinates set to PrevLoc" + prevLoc);
}
}catch(Exception e){
e.printStackTrace();
}
if(speed <= 160){
try
{
mView.calculateAngleOfDeviation(speed);
}
catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}else
{
Toast.makeText(Speedometer.this, "CONTROL SPEED", Toast.LENGTH_SHORT).show();
}
}
You can also utilize same in your activity ::
-----------------------------------------------
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
stopListening();
super.onPause();
}
private void stopListening() {
// TODO Auto-generated method stub
try{
if(lm != null){
lm.removeUpdates(this);
}else{
lm.removeUpdates(this);
}
}catch(Exception e){
e.printStackTrace();
}
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
startListening();
}
private void startListening() {
// TODO Auto-generated method stub
try{
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, this);
}catch(Exception e){
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
lm.removeUpdates(Speedometer.this);
//System.exit(0);
finish();
}
Finally there's always a lot of way to do single thing.
Hope it helps...
Cheers!
I'm trying to write a simple Android Service that runs in background and receives location updates from LocationClient (Google Map API Android V2). The problem is that when the screen go off, my Service doesn't receives anymore location updates. I tried to check if the service was active, even with screen off, and it does (I have a TimerTask scheduling a log). When screen is on I can receive location updates, but when screen goes off I see only TimerTask's logs and I don't receive any location update. Waking up screen turns on location updates again. How can this be solved?
Here is my simple service:
public class LocationService extends Service implements GooglePlayServicesClient.ConnectionCallbacks, GooglePlayServicesClient.OnConnectionFailedListener, LocationListener{
private static final String TAG = LocationService.class.getSimpleName();
private LocationClient mLocationClient;
private Timer timer;
private static final LocationRequest REQUEST = LocationRequest.create()
.setInterval(5*1000) // 5 seconds
.setFastestInterval(3*1000) // 3 seconds
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
@Override
public void onCreate() {
Log.d(TAG, "Creating..");
mLocationClient = new LocationClient(this, this, this);
timer = new Timer();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d(TAG, "Starting..");
if(!mLocationClient.isConnected() || !mLocationClient.isConnecting()) {
Log.d(TAG, "Connecting location client..");
mLocationClient.connect();
}
timer.scheduleAtFixedRate(new TimerTask(){
@Override
public void run() {
Log.d(TAG, "TimerTask executing");
}}, 0, 3*1000);
return START_STICKY;
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.d(TAG, "Connection failed..");
stopSelf();
}
@Override
public void onConnected(Bundle bundle) {
System.out.println("Connected ...");
mLocationClient.requestLocationUpdates(REQUEST, this);
}
@Override
public void onDisconnected() {
Log.d(TAG, "Disconnected..");
stopSelf();
}
@Override
public IBinder onBind(Intent arg0) {
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, "Received location update");
}
@Override
public void onDestroy() {
Log.d(TAG, "Destroying..");
timer.cancel();
mLocationClient.removeLocationUpdates(this);
}
}
解决方案
Update:--
Firstly you need to define LocationClient in your OnCreate() which will call your onConnected() ...
Define you locationClient like this ..
locationClient = new LocationClient(this, this, this);
locationClient.connect();
Now in your onConnected() .. Just request for Location update like this..
@Override
public void onConnectionFailed(ConnectionResult arg0) {
// TODO Auto-generated method stub
}
@Override
public void onConnected(Bundle arg0) {
src = locationClient.getLastLocation();
System.out.println("======================location 1==" + src);
LocationRequest lrequest = new LocationRequest();
lrequest.setInterval(0);
lrequest.setSmallestDisplacement(0);
lrequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationClient.requestLocationUpdates(lrequest, new LocationListener() {
@Override
public void onLocationChanged(Location arg0) {
System.out.println("======================location 1233==" +
arg0);
/*Toast.makeText(getApplicationContext(),
"Location is 12" + arg0.getLatitude(),
Toast.LENGTH_SHORT).show();*/
}
});
}
@Override
public void onDisconnected() {
// TODO Auto-generated method stub
}
*************** BEFORE ************
If your main concern is finding your location update continually.. then U can use undermentioned.
Use this :: ( This will periodically update user's location based on GPS )
For OnCreate()::
----------------------
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.speed);
initui();
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
provider = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
if(!provider){
String text = "ENABLE GPS TO ACCESS SPEEDO METER!";
Toast.makeText(Speedometer.this, text, Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
if (location != null) {
/*lat = (int) (location.getLatitude() * 1E6);
longi = (int)(location.getLongitude() * 1E6);*/
String text = "Got Coordinates";
Toast.makeText(Speedometer.this, text, Toast.LENGTH_SHORT).show();
}
//lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 2, this);
}
Now use onLocationChanged()
---------------------------
@Override
public void onLocationChanged(Location loc) {
// TODO Auto-generated method stub
float distance = 0;
//float prevDis = 0;
try{
if(prevLoc==null)
{
prevLoc = loc;
//Toast.makeText(MainActivity.this, "PrevLOC" + prevLoc, Toast.LENGTH_SHORT).show();
Log.i("Main Activity", "Prev LOC" + prevLoc);
}
else {
try{
Runtime r = Runtime.getRuntime();
r.gc();
}catch(Exception e){
e.printStackTrace();
}
// When prevLoc is not null
Log.i("Main Activity", "Prev LOC in new LOC BLAH BLAH BLAH" + prevLoc);
newLoc = loc;
//Toast.makeText(MainActivity.this, "NewLoc" + newLoc, Toast.LENGTH_SHORT).show();
Log.i("Main Activity", "New LOC" + newLoc);
distance = prevLoc.distanceTo(newLoc);
Log.i("Main Activity", "New DISTANCE DISTANCE DISTANCE DISTANCE DISTANCE DISTANCE " + distance);
distance = (float) (3.6*distance);
speed = distance;
prevLoc = newLoc;
Log.i("Main Activity", "New Coordinates set to PrevLoc" + prevLoc);
}
}catch(Exception e){
e.printStackTrace();
}
if(speed <= 160){
try
{
mView.calculateAngleOfDeviation(speed);
}
catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}else
{
Toast.makeText(Speedometer.this, "CONTROL SPEED", Toast.LENGTH_SHORT).show();
}
}
You can also utilize same in your activity ::
-----------------------------------------------
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
stopListening();
super.onPause();
}
private void stopListening() {
// TODO Auto-generated method stub
try{
if(lm != null){
lm.removeUpdates(this);
}else{
lm.removeUpdates(this);
}
}catch(Exception e){
e.printStackTrace();
}
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
startListening();
}
private void startListening() {
// TODO Auto-generated method stub
try{
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, this);
}catch(Exception e){
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
lm.removeUpdates(Speedometer.this);
//System.exit(0);
finish();
}
Finally there's always a lot of way to do single thing.
Hope it helps...
Cheers!
这篇关于屏幕关闭后无法接收LocationClient的位置更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
