Develop Reference

Unable to Show Toast in Services after Every 5 Second

When ever i try to toast in service it Doesn't work But When I use LOg it Work Fine How Can I Fix this?
This is My Code Check it please:
Main Activity
public class MainActivity extends AppCompatActivity {
Button btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn =(Button) findViewById(R.id.btnDownload);
Intent in= new Intent(this,MyService.class);
startService(in);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i=new Intent(getApplicationContext(),Main2Activity.class);
startActivity(i);
}
});
}
My Service Class: If I use Log Instead Of Toast it Works But When I Use Toast It Doesn't Show Anything...
public class MyService extends Service {
public MyService() {
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Runnable r=new Runnable() {
#Override
public void run() {
for (int i=0 ; i<5 ; i++){
long futureTime = System.currentTimeMillis()+5000;
while (System.currentTimeMillis() < futureTime){
synchronized (this){
try {
wait(futureTime-System.currentTimeMillis());
Toast.makeText(getApplicationContext(),"Image Downloading",Toast.LENGTH_SHORT);
}catch (Exception e){}
}
}
}
}
};
Thread razasThread = new Thread(r);
razasThread.start();
return Service.START_STICKY;
}
#Override
public void onDestroy() {
Toast.makeText(getApplicationContext(),"OnDestroy method Called",Toast.LENGTH_SHORT).show();
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
}

Try doing it using Handler. It might be throwing an exception since you are trying to show the Toast on a different thread:
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
#Override
public void run() {
for (int i=0 ; i<5 ; i++){
long futureTime = System.currentTimeMillis()+5000;
while (System.currentTimeMillis() < futureTime){
synchronized (this){
try {
wait(futureTime-System.currentTimeMillis());
Toast.makeText(getApplicationContext(),"Image Downloading",Toast.LENGTH_SHORT).show();
}catch (Exception e){}
}
}
}
}
});

Chronometer keep in background time spent

i would developing a feature in my app that when click on button on my activity launch a service that start,pause and resume a Chronometer.
But I have a problem how start and stop in my background service.
I created my Activity
public class StartWorkActivity extends ActivityGeneralToolbar {
protected final void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState, R.layout.activity_start_work);
Chronometer chronometer = (Chronometer) findViewById(R.id.chronometer);
}
#Override
protected void onStop() {
super.onStop();
}
public void startWork(View v){
Intent msgIntent = new Intent(StartWorkActivity.this, WorkTimerService.class);
msgIntent.setAction("START_TIMER");
getBaseContext().startService(msgIntent);
}
public void pauseWork(View v){
Intent msgIntent = new Intent(StartWorkActivity.this, WorkTimerService.class);
msgIntent.setAction("PAUSE_TIMER");
}
public void resumeWork(View v){
//call service
Intent msgIntent = new Intent(StartWorkActivity.this, WorkTimerService.class);
msgIntent.setAction("RESUME_TIMER");
}
#Override
protected void onPause() {
super.onPause();
}
#Override
protected void onResume() {
super.onResume();
}
}
And my WorkTimerService
public class WorkTimerService extends IntentService {
long timeWhenStopped = 0;
Chronometer chronometer;
public WorkTimerService() {
super("SystemService");
}
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
protected void onHandleIntent(Intent intent) {
if(intent.getAction() == "START_TIMER"){
startWork();
}
if(intent.getAction() == "PAUSE_TIMER"){
pauseWork();
}if(intent.getAction() == "RESUME_TIMER"){
resumeWork();
}
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags,startId);
return START_STICKY;
}
public void pauseWork(){
timeWhenStopped = chronometer.getBase() - SystemClock.elapsedRealtime();
chronometer.stop();
}
public void resumeWork(){
chronometer.setBase(SystemClock.elapsedRealtime() + timeWhenStopped);
timeWhenStopped = 0;
chronometer.start();
}
public void startWork(){
chronometer.start();
}
}
But my problem is that Chronometer obviously is null in my service, because I read that is not possible, in the service, interact with the ui.
And so, how i can send, or work with Chronometer in background?

Chronometer is a UI widget (actually a TextView) in Android. So, you can't use it for non-UI purposes. Try to use Timer or CountDownTimer instead.
See this for an example usage of Timer inside Service: https://stackoverflow.com/a/3819721/5250273

android GPS still getting postion when i'm not moving

I'm developing a tracking app. and i have problem with GPS module. The app must record a route. App work fine, but sometimes when the device is not moving, GPS still receive
continuous coordinate that don't indicate my position, error is within a radius of 20 meter, and when I'm moving again work fine.
Please give me some tips that can help me to fix this problem. Thanks a lot.
I have 3 calsses
1 - GPSReceiver here is method for get location
public void getMyLoction(){
_locationManager = (LocationManager) _context.getSystemService(LOCATION_SERVICE);
_isGPSEnabled =_locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (_isGPSEnabled) {
if (_location == null) {
_locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, this);
if (_locationManager != null) {
_location = _locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
setLocation(_location);
}
}
}
}
2 RecordingActivity (take coordonates form services and processes then) work fine, a comment in method what they do.
public class RecordingActivity extends FragmentActivity {
public final static String BROADCAST_ACTION = "map.trackv";
public BroadcastReceiver receiver;
private GoogleMap map;
private TextView _messageToUser;
private Coordinate _pointFromService;
private long _timeWhenStartButtonWasPressed;
private List<Coordinate> _unprocessedCoords;
private List<Coordinate> _processedCoords;
private Button _stopButton;
private Button _startButton;
private String _startRecordingDate;
private String _stopRecordingDate;
private GPSReceiver _gps;
private DataBaseOperations _dataSource;
private boolean _recording;
private boolean _gpsStatus;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recording_route);
initActvity();
checkIfGPSisOn();
try {
Runtime.getRuntime().exec("logcat -f" + " /sdcard/Logcat.txt");
} catch (IOException e) {
// TODO Auto-generated catch block
Log.d("nu pot", "DDDDD");
e.printStackTrace();
}
receveirWork();
IntentFilter intentFilt = new IntentFilter(BROADCAST_ACTION);
registerReceiver(receiver, intentFilt);
}
public void checkIfGPSisOn() {
//check on start
}
public void receveirWork() {
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// request points and process then,
}
};
}
#Override
protected void onDestroy() {
super.onDestroy();
if (_stopButton.isEnabled())
{
stopService(new Intent(this, RecordingService.class));
_unprocessedCoords = null;
_processedCoords = null;
}
unregisterReceiver(receiver);
}
#Override
protected void onResume() {
if (!_stopButton.isEnabled()) {
_startButton.setEnabled(true);
_messageToUser.setText(Constants.PRESS_START_BUTTON);
map.clear();
}
super.onResume();
}
// actiune buton start;
public void startButtonEvent(View V) {
buttonsStateAndMessageToShow(false, true, Constants.MESSAGE_TO_WAIT);
_timeWhenStartButtonWasPressed = System.currentTimeMillis();
startService(new Intent(this, RecordingService.class));
// start service to get position
}
public void stopButtonEvent(View V) {
stopService(new Intent(this, RecordingService.class));
// stop service
// save route in BD
// resetData;
}
public void initActvity() {
// init date
}
#Override
protected void onSaveInstanceState(Bundle outState) {
// save state
}
}
3 RecordingServices class, ii think here is the problem.
public class RecordingService extends Service {
private Thread _backgroundWork;
private boolean _threadCanRun;
private GPSReceiver _gps;
private Coordinate _pointToSent;
public void onCreate() {
super.onCreate();
_threadCanRun = true;
_backgroundWork = new Thread(new Runnable() {
#Override
public void run() {
Looper.prepare();
getLocationFromGPS();
Looper.loop();
}
});
}
public int onStartCommand(Intent intent, int flags, int startId) {//
_backgroundWork.start();
return super.onStartCommand(intent, flags, startId);
}
public void onDestroy() {
_threadCanRun = false;
super.onDestroy();
}
public IBinder onBind(Intent intent) {
return null;
}
public void getLocationFromGPS() {
while (_threadCanRun) {
Intent _intent = new Intent(RecordingActivity.BROADCAST_ACTION);
_gps = new GPSReceiver(this);
_gps.getMyLoction();
if (_gps.getIsGPSEnabled()) {
try {
TimeUnit.SECONDS.sleep(2);
} catch (InterruptedException e) {}
sentPoint(_intent);
} else {
try {
TimeUnit.MILLISECONDS.sleep(500);
} catch (InterruptedException e) {}
_intent.putExtra("latitude", 0);
_intent.putExtra("longitude", 0);
_intent.putExtra("time", 0);
_intent.putExtra("GPSstatus", false);
sendBroadcast(_intent);
}
}
}
private void sentPoint(Intent _intent) {
_pointToSent = new Coordinate(_gps.getLatitude(), _gps.getLongitude(), _gps.getTime());
_intent.putExtra("latitude", _pointToSent.getLatitude());
_intent.putExtra("longitude", _pointToSent.getlongitude());
_intent.putExtra("time", _pointToSent.getTime());
_intent.putExtra("GPSstatus", _gps.getIsGPSEnabled());
sendBroadcast(_intent);
_pointToSent = null;
}
}

repeating the Location update request depends on how u implemented your tracking system
but in general(which is not recommended , just change your request update rate to save client Battery usage) you can find the distance between your locations by location1.distanceTo(location2) so if the distance is smaller than 30m then put the new location away

How to display an image using service in android

I want to show image. where I have to perform operations in service and display result in UI. I don't want to use async task as per requirment. I don't know how to proceed and display image. Please help me.
My code has follows:
public class Service_Photo extends Service {
public Service_Photo() {
}
#Override
public IBinder onBind(Intent intent) {
throw new UnsupportedOperationException("Not yet implemented");
}
#Override
public void onCreate() {
super.onCreate();
Toast.makeText(this, "The new Service was Created", Toast.LENGTH_LONG).show();
}
#Override
public void onStart(Intent intent, int startId) {
// For time consuming an long tasks you can launch a new thread here...
Toast.makeText(this, " Service Started", Toast.LENGTH_LONG).show();
updateImages();
}
private void updateImages()
{
String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = "am/a.jpg";
File f = new File(baseDir + File.separator + fileName);
if(f.exists()){
Bitmap myBitmap = BitmapFactory.decodeFile(f.getAbsolutePath());
// img = (ImageView)findViewById(R.id.image);
// img.setImageBitmap(myBitmap);
Toast.makeText(getApplicationContext(), "Hello"+myBitmap.toString(), Toast.LENGTH_SHORT)
.show();
}
}
#Override
public void onDestroy() {
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();
}
public class ImageDisplay extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//how to display the operation performed in service and display in image from service?
}
}

The best solution in your case is to use broadcast receivers. So in your activity
BroadcastReceiver mReceiver = new BroadcastReceiver(onReceive(Context context, Intent intent)
{
if(intent.getAction().equals("your_load_photo_action"))
{
ImageDisplay.this.runOnUiThread(new Runnable() {
#Override
public void run() {
view.setImageBitmap("YourImage");
}
});
}
});
#Override
public void onResume()
{
LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver,
new IntentFilter("your_load_photo_action"));
}
#Override
public void onPause()
{
LocalBroadcastManager.getInstance(this).unregisterReceiver(mReceiver);
}
and on your onCreate() initialize your view
And in your service, in updateImages()
Just send broadcast an intent with the action "your_load_photo_action"

How to display the value in the text field of Activity which is updated from service class?

This is my service class in that i increment the i value based on time...
public class BackService extends Service {
int i=0;
#Override
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public void onCreate() {
pollForUpdates();
super.onCreate();
}
#Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
}
private void pollForUpdates() {
Timer timer=new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
Log.v("Service class called", "service class called "+i);
getRunningApps();
i++;
}
},0,1000);
}
private void getRunningApps()
{
}
#Override
public void onDestroy() {
super.onDestroy();
}
}
I want to append the i value to the TextView. i.e the TextView value is dynamically change based on i value...
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startService(new Intent(this, BackService.class));
TextView tx=(TextView)findViewById(R.id.textView1);
}}
how to append the i value to tx...
Thank you in advance..

You will need to register Broadcast receiver for Sending data back from Service to Activity.see these usefull example for communication between Activity to service :
http://androidexperinz.wordpress.com/2012/02/14/communication-between-service-and-activity-part-1/
http://androidexperinz.wordpress.com/2012/02/21/communication-between-service-and-activity-part-2/
http://blog.philippheckel.com/2012/06/10/android-example-communication-between-activity-and-service-using-messaging/

Use this
public class MainActivity extends Activity {
TextView tx;
RefreshBroadcastReciver mBroadCastReciver;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startService(new Intent(this, BackService.class));
tx =(TextView)findViewById(R.id.textView1);
}
#Override
protected void onResume() {
super.onResume();
mBroadCastReciver = new RefreshBroadcastReciver();
registerReceiver(mBroadCastReciver, new IntentFilter("sendData"));
}
private class RefreshBroadcastReciver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
tx.setText(intent.getIntExtra("i", 0)+"");
}
}
#Override
protected void onStop() {
super.onStop();
if(mBroadCastReciver!=null)
unregisterReceiver(mBroadCastReciver);
}
}
and your service is here
public class BackService extends Service {
int i=0;
Intent intent1;
#Override
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public void onCreate() {
pollForUpdates();
super.onCreate();
}
#Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
intent1=new Intent("sendData");
}
private void pollForUpdates() {
Timer timer=new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
Log.v("Service class called", "service class called "+i);
getRunningApps();
i++;
Message msg=new Message();
msg.arg1=i;
handler.sendMessage(msg);
}
},0,1000);
}
private void getRunningApps()
{
}
#Override
public void onDestroy() {
super.onDestroy();
}
protected Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
intent1.putExtra("i", msg.arg1);
sendBroadcast(intent1);
}
};
}