我编写了一个记录用户位置,当前速度,平均速度和最高速度的应用程序.我想知道如何使应用程序执行以下 *** 作：@H_403_3@
>防止屏幕在屏幕上打开时关闭
>如果用户打开另一个应用程序或返回主屏幕,接到电话等,应用程序应继续收集数据
(或者每次更新位置时将所有数据写入数据库会更好吗？并且可能有一个按钮来表示何时开始和停止收集数据？)@H_403_3@
这是我写的代码. (如果你愿意,可以随意使用它,如果你对我如何改进它有任何建议,我会对建设性的批评持开放态度：D)@H_403_3@
package Hartford.gps;import java.math.BigDecimal;import androID.app.Activity;import androID.content.Context;import androID.location.Criteria;import androID.location.Location;import androID.location.LocationListener;import androID.location.LocationManager;import androID.os.Bundle;import androID.Widget.TextVIEw;public class GPSMain extends Activity implements LocationListener {LocationManager locationManager;LocationListener locationListener;//text vIEws to display latitude and longitudeTextVIEw latituteFIEld;TextVIEw longitudeFIEld;TextVIEw currentSpeedFIEld;TextVIEw kmphSpeedFIEld;TextVIEw avgSpeedFIEld;TextVIEw avgKmphFIEld;//objects to store positional informationprotected double lat;protected double lon;//objects to store values for current and average speedprotected double currentSpeed;protected double kmphSpeed;protected double avgSpeed;protected double avgKmph;protected double totalSpeed;protected double totalKmph;//counter that is incremented every time a new position is received,used to calculate average speedint counter = 0;/** Called when the activity is first created. */@OverrIDepublic voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.main); run();}@OverrIDepublic voID onResume() { locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1,this); super.onResume();}@OverrIDepublic voID onPause() { locationManager.removeUpdates(this); super.onPause();}private voID run(){ final Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setSpeedrequired(true); criteria.setAltituderequired(false); criteria.setbearingrequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_LOW); //Acquire a reference to the system Location Manager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); // define a Listener that responds to location updates locationListener = new LocationListener() { public voID onLocationChanged(Location newLocation) { counter++; //current speed fo the gps device currentSpeed = round(newLocation.getSpeed(),3,BigDecimal.ROUND_HALF_UP); kmphSpeed = round((currentSpeed*3.6),BigDecimal.ROUND_HALF_UP); //all speeds added together totalSpeed = totalSpeed + currentSpeed; totalKmph = totalKmph + kmphSpeed; //calculates average speed avgSpeed = round(totalSpeed/counter,BigDecimal.ROUND_HALF_UP); avgKmph = round(totalKmph/counter,BigDecimal.ROUND_HALF_UP); //gets position lat = round(((double) (newLocation.getLatitude())),BigDecimal.ROUND_HALF_UP); lon = round(((double) (newLocation.getLongitude())),BigDecimal.ROUND_HALF_UP); latituteFIEld = (TextVIEw) findVIEwByID(R.ID.lat); longitudeFIEld = (TextVIEw) findVIEwByID(R.ID.lon); currentSpeedFIEld = (TextVIEw) findVIEwByID(R.ID.speed); kmphSpeedFIEld = (TextVIEw) findVIEwByID(R.ID.kmph); avgSpeedFIEld = (TextVIEw) findVIEwByID(R.ID.avgspeed); avgKmphFIEld = (TextVIEw) findVIEwByID(R.ID.avgkmph); latituteFIEld.setText("Current Latitude: "+String.valueOf(lat)); longitudeFIEld.setText("Current Longitude: "+String.valueOf(lon)); currentSpeedFIEld.setText("Current Speed (m/s): "+String.valueOf(currentSpeed)); kmphSpeedFIEld.setText("Cuttent Speed (kmph): "+String.valueOf(kmphSpeed)); avgSpeedFIEld.setText("Average Speed (m/s): "+String.valueOf(avgSpeed)); avgKmphFIEld.setText("Average Speed (kmph): "+String.valueOf(avgKmph)); } //not entirely sure what these do yet public voID onStatusChanged(String provIDer,int status,Bundle extras) {} public voID onProvIDerEnabled(String provIDer) {} public voID onProvIDerDisabled(String provIDer) {} }; // Register the Listener with the Location Manager to receive location updates locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,locationListener);}//Method to round the doubles to a max of 3 decimal placespublic static double round(double unrounded,int precision,int roundingMode){ BigDecimal bd = new BigDecimal(unrounded); BigDecimal rounded = bd.setScale(precision,roundingMode); return rounded.doubleValue();}@OverrIDepublic voID onLocationChanged(Location location) { // Todo auto-generated method stub}@OverrIDepublic voID onProvIDerDisabled(String provIDer) { // Todo auto-generated method stub}@OverrIDepublic voID onProvIDerEnabled(String provIDer) { // Todo auto-generated method stub}@OverrIDepublic voID onStatusChanged(String provIDer,Bundle extras) { // Todo auto-generated method stub}} 从Marco Grassi和Marcovena解决了两个问题.@H_403_3@
新代码：@H_403_3@
package Hartford.gps;import androID.app.Activity;import androID.content.Context;import androID.content.Intent;import androID.os.Bundle;import androID.os.PowerManager;import androID.Widget.TextVIEw;public class GPSMain extends Activity {//text vIEws to display latitude and longitudestatic TextVIEw latituteFIEld;static TextVIEw longitudeFIEld;static TextVIEw currentSpeedFIEld;static TextVIEw kmphSpeedFIEld;static TextVIEw avgSpeedFIEld;static TextVIEw avgKmphFIEld;static TextVIEw topSpeedFIEld;static TextVIEw topKmphFIEld;//objects to store positional informationprotected static double lat;protected static double lon;//objects to store values for current and average speedprotected static double currentSpeed;protected static double kmphSpeed;protected static double avgSpeed;protected static double avgKmph;protected static double totalSpeed;protected static double totalKmph;protected static double topSpeed=0;protected static double topKmph=0;//counter that is incremented every time a new position is received,used to calculate average speedstatic int counter = 0;/** Called when the activity is first created. */@OverrIDepublic voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.main); PowerManager powerManager = (PowerManager)getSystemService(Context.POWER_SERVICE); PowerManager.WakeLock wL = powerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK,"My Tag"); wL.acquire(); startService(new Intent(this,Calculations.class)); latituteFIEld = (TextVIEw) findVIEwByID(R.ID.lat); longitudeFIEld = (TextVIEw) findVIEwByID(R.ID.lon); currentSpeedFIEld = (TextVIEw) findVIEwByID(R.ID.speed); kmphSpeedFIEld = (TextVIEw) findVIEwByID(R.ID.kmph); avgSpeedFIEld = (TextVIEw) findVIEwByID(R.ID.avgspeed); avgKmphFIEld = (TextVIEw) findVIEwByID(R.ID.avgkmph); topSpeedFIEld = (TextVIEw) findVIEwByID(R.ID.topspeed); topKmphFIEld = (TextVIEw) findVIEwByID(R.ID.topkmph);}static voID run(){ latituteFIEld.setText("Current Latitude: "+String.valueOf(lat)); longitudeFIEld.setText("Current Longitude: "+String.valueOf(lon)); currentSpeedFIEld.setText("Current Speed (m/s): "+String.valueOf(currentSpeed)); kmphSpeedFIEld.setText("Cuttent Speed (kmph): "+String.valueOf(kmphSpeed)); avgSpeedFIEld.setText("Average Speed (m/s): "+String.valueOf(avgSpeed)); avgKmphFIEld.setText("Average Speed (kmph): "+String.valueOf(avgKmph)); topSpeedFIEld.setText("top Speed (m/s): "+String.valueOf(topSpeed)); topKmphFIEld.setText("top Speed (kmph): "+String.valueOf(topKmph));}} 和@H_403_3@
package Hartford.gps;import java.math.BigDecimal;import androID.app.Service;import androID.content.Context;import androID.content.Intent;import androID.location.Criteria;import androID.location.Location;import androID.location.LocationListener;import androID.location.LocationManager;import androID.os.Bundle;import androID.os.IBinder;import androID.util.Log;import androID.Widget.Toast;public class Calculations extends Service implements LocationListener {static LocationManager locationManager;LocationListener locationListener;private static final String TAG = "Calculations";@OverrIDepublic IBinder onBind(Intent intent) { // Todo auto-generated method stub return null;}@OverrIDepublic voID onCreate() { Toast.makeText(this,"My Service Created",Toast.LENGTH_LONG).show(); Log.d(TAG,"onCreate"); run();}private voID run(){ final Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setSpeedrequired(true); criteria.setAltituderequired(false); criteria.setbearingrequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_LOW); //Acquire a reference to the system Location Manager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); // define a Listener that responds to location updates locationListener = new LocationListener() { public voID onLocationChanged(Location newLocation) { GPSMain.counter++; //current speed for the GPS device GPSMain.currentSpeed = round(newLocation.getSpeed(),BigDecimal.ROUND_HALF_UP); GPSMain.kmphSpeed = round((GPSMain.currentSpeed*3.6),BigDecimal.ROUND_HALF_UP); if (GPSMain.currentSpeed>GPSMain.topSpeed) { GPSMain.topSpeed=GPSMain.currentSpeed; } if (GPSMain.kmphSpeed>GPSMain.topKmph) { GPSMain.topKmph=GPSMain.kmphSpeed; } //all speeds added together GPSMain.totalSpeed = GPSMain.totalSpeed + GPSMain.currentSpeed; GPSMain.totalKmph = GPSMain.totalKmph + GPSMain.kmphSpeed; //calculates average speed GPSMain.avgSpeed = round(GPSMain.totalSpeed/GPSMain.counter,BigDecimal.ROUND_HALF_UP); GPSMain.avgKmph = round(GPSMain.totalKmph/GPSMain.counter,BigDecimal.ROUND_HALF_UP); //gets position GPSMain.lat = round(((double) (newLocation.getLatitude())),BigDecimal.ROUND_HALF_UP); GPSMain.lon = round(((double) (newLocation.getLongitude())),BigDecimal.ROUND_HALF_UP); GPSMain.run(); } //not entirely sure what these do yet public voID onStatusChanged(String provIDer,locationListener);}//Method to round the doubles to a max of 3 decimal placespublic static double round(double unrounded,roundingMode); return rounded.doubleValue();}public voID onLocationChanged(Location location) { // Todo auto-generated method stub}public voID onProvIDerDisabled(String provIDer) { // Todo auto-generated method stub}public voID onProvIDerEnabled(String provIDer) { // Todo auto-generated method stub}public voID onStatusChanged(String provIDer,Bundle extras) { // Todo auto-generated method stub}} 更新shababhsIDdique@H_403_3@
import java.math.BigDecimal;import java.text.DecimalFormat;import java.text.NumberFormat;import androID.app.Service;import androID.content.Context;import androID.content.Intent;import androID.location.Criteria;import androID.location.Location;import androID.location.LocationListener;import androID.location.LocationManager;import androID.os.Bundle;import androID.os.IBinder;import androID.util.Log;import androID.Widget.Toast;public class Calculations extends Service{static LocationManager locationManager;static LocationListener locationListener;private static long timerTime = 1;private static float timerfloatValue = 1.0f;private Context context;private int counter = 0;@OverrIDepublic IBinder onBind(Intent intent) {return null;}@OverrIDepublic voID onCreate() { context = this; update();}protected voID update(){ final Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setSpeedrequired(true); criteria.setAltituderequired(false); criteria.setbearingrequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_LOW); //Acquire a reference to the system Location Manager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); // define a Listener that responds to location updates locationListener = new LocationListener() { public voID onLocationChanged(Location newLocation) { counter++; if(GPSMain.GPSHasstarted==0){ GPSMain.prevIoUsLocation = newLocation; //gets position GPSMain.lat = round(((double) (GPSMain.prevIoUsLocation.getLatitude())),BigDecimal.ROUND_HALF_UP); GPSMain.lon = round(((double) (GPSMain.prevIoUsLocation.getLongitude())),BigDecimal.ROUND_HALF_UP); GPSMain.startingLocation = GPSMain.prevIoUsLocation; GPSMain.routeLat.add(Double.toString(GPSMain.startingLocation.getLatitude())); GPSMain.routeLon.add(Double.toString(GPSMain.startingLocation.getLongitude())); GPSMain.startTime = System.currentTimeMillis(); GPSMain.GPSHasstarted++; Toast.makeText(context,"GPS Connection Established",Toast.LENGTH_LONG).show(); startService(new Intent(context,AccelerometerReader.class)); Toast.makeText(context,"Accelerometer Calculating",Toast.LENGTH_LONG).show(); Toast.makeText(context,"Have A Safe Trip!",Toast.LENGTH_LONG).show(); } //gets position GPSMain.lat = round(((double) (newLocation.getLatitude())),BigDecimal.ROUND_HALF_UP); if (newLocation.distanceto(GPSMain.prevIoUsLocation)>2.0f){ GPSMain.distanceBetweenPoints = GPSMain.distanceBetweenPoints + newLocation.distanceto(GPSMain.prevIoUsLocation); } //current speed for the GPS device GPSMain.mpsspeed = newLocation.getSpeed(); if (GPSMain.mpsspeed>GPSMain.topMps) {GPSMain.topMps=GPSMain.mpsspeed;} //store location in order to calculate distance during next iteration. GPSMain.prevIoUsLocation = newLocation; if (counter % 20 == 0){ GPSMain.routeLat.add(Double.toString(GPSMain.prevIoUsLocation.getLatitude())); GPSMain.routeLon.add(Double.toString(GPSMain.prevIoUsLocation.getLongitude())); } } //not entirely sure what these do yet public voID onStatusChanged(String provIDer,Bundle extras) {} public voID onProvIDerEnabled(String provIDer) {} public voID onProvIDerDisabled(String provIDer) {} }; // Register the Listener with the Location Manager to receive location updates locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,2000,20,int roundingMode){ BigDecimal bd = new BigDecimal(unrounded); BigDecimal rounded = bd.setScale(precision,roundingMode); return rounded.doubleValue();}//formats the time taken in milliseconds into hours minutes and secondspublic static String getTiMetaken(long end,long start){ @SuppressWarnings("unused") String formattedTime = "",hourHour = "",hourMin = ":",minSec = ":"; long tiMetaken = end-start,hour = 0,min = 0,sec = 0; timerTime = tiMetaken; tiMetaken = (end-start)/1000; if (tiMetaken>9 ){ hourHour = "0"; hourMin = ":0"; if (tiMetaken>=60){ if (tiMetaken>= 3200){ hour = tiMetaken/3200; tiMetaken = tiMetaken%3200; if (hour>9){ hourHour = ""; } } min = tiMetaken/60; tiMetaken = tiMetaken%60; if (min >9){ hourMin = ":"; } } sec = tiMetaken; if(sec%60<10){ minSec = ":0"; } return formattedTime = (hourHour+hour+hourMin+min+minSec+sec); } sec = tiMetaken; minSec = ":0"; hourMin = ":0"; hourHour = "0"; return formattedTime = (hourHour+hour+hourMin+min+minSec+sec);}public static double averageSpeed(){ //calculates average speed if (timerTime==0){timerTime=1;} timerfloatValue = (float) timerTime; timerfloatValue = timerfloatValue/1000; return GPSMain.avgMps = GPSMain.distanceBetweenPoints/timerfloatValue;}//rounds the float values from the accelerometerstatic String roundTwoDecimalfloat(float a){ float b = a/9.8f; String formattednum; NumberFormat nf = new DecimalFormat(); nf.setMaximumFractionDigits(2); nf.setMinimumFractionDigits(2); formattednum = nf.format(b); return formattednum;}}解决方法 问题1：您必须获得 WakeLock.有多种类型的唤醒锁,取决于您是否只需要cpu或屏幕. 问题2：您应该在Service中收集数据,并将图形界面与收集数据分开.如果您正确实施数据,服务将继续收集数据,直到您停止它为止.@H_403_3@ 总结
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