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我幾天前開始學習android，我想設計一個應用程序，我可以計算我使用gps運行的距離，時間和速度。Android使跑步距離計算應用程序
所以我嘗試了幾個例子，並通過了一些教程。我寫了下面的代碼。
但是，只是給我的GPS位置，但它沒有計算的距離和速度，任何人都可以告訴我，我的問題在哪裏，以及如何解決它。你不使用distanceBetween或distanceTo方法和選擇來計算距離自己的方式
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class test extends Activity implements Runnable {
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 3;
protected LocationManager locationManager;
Location location;
static double n=0;
Long s1,r1;
double plat,plon,clat,clon,dis;
MyCount counter;
Thread t1;
EditText e1;
boolean bool=true;
Button b1,b2,b3,b4,b5;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gps);
b1=(Button)findViewById(R.id.button1);//<--- current position
b2=(Button)findViewById(R.id.button2);//<---- start moving.. calculates distance on clicking this
b3=(Button)findViewById(R.id.button3);//<--- pause
b4=(Button)findViewById(R.id.button4);//<-- resume
b5=(Button)findViewById(R.id.button5);// <-- get distance
e1=(EditText)findViewById(R.id.editText1);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
new MyLocationListener()
);
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showCurrentLocation();
}
});
}
protected void showCurrentLocation() {
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
String message = String.format(
"Current Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
clat=location.getLatitude();
clon=location.getLongitude();
Toast.makeText(test.this, message,
Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(test.this, "null location",
Toast.LENGTH_LONG).show();
}
}
public void start (View v){
switch(v.getId()){
case R.id.button2:
t1=new Thread();
t1.start();
counter= new MyCount(30000,1000);
counter.start();
break;
case R.id.button3:
counter.cancel();
bool=false;
break;
case R.id.button4:
counter= new MyCount(s1,1000);
counter.start();
bool=true;
break;
case R.id.button5:
double time=n*30+r1;
Toast.makeText(test.this,"distance in metres:"+String.valueOf(dis)+"Velocity in m/sec :"+String.valueOf(dis/time)+"Time :"+String.valueOf(time),Toast.LENGTH_LONG).show();
}
}
private class MyLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
String message = String.format(
"New Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
Toast.makeText(test.this, message, Toast.LENGTH_LONG).show();
}
public void onStatusChanged(String s, int i, Bundle b) {
Toast.makeText(test.this, "Provider status changed",
Toast.LENGTH_LONG).show();
}
public void onProviderDisabled(String s) {
Toast.makeText(test.this,
"Provider disabled by the user. GPS turned off",
Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String s) {
Toast.makeText(test.this,
"Provider enabled by the user. GPS turned on",
Toast.LENGTH_LONG).show();
}
}
public class MyCount extends CountDownTimer{
public MyCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
@Override
public void onFinish() {
counter= new MyCount(30000,1000);
counter.start();
n=n+1;
}
@Override
public void onTick(long millisUntilFinished) {
s1=millisUntilFinished;
r1=(30000-s1)/1000;
e1.setText(String.valueOf(r1));
}
}
public double getDistance(double lat1, double lon1, double lat2, double lon2) {
double latA = Math.toRadians(lat1);
double lonA = Math.toRadians(lon1);
double latB = Math.toRadians(lat2);
double lonB = Math.toRadians(lon2);
double cosAng = (Math.cos(latA) * Math.cos(latB) * Math.cos(lonB-lonA)) +
(Math.sin(latA) * Math.sin(latB));
double ang = Math.acos(cosAng);
double dist = ang *6371;
return dist;
}
@Override
public void run() {
while (bool){
clat=location.getLatitude();
clon=location.getLongitude();
if(clat!=plat || clon!=plon){
dis+=getDistance(plat,plon,clat,clon);
plat=clat;
plon=clon;
}
}
}
}