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我的第一個活動是這樣的：如何刪除NumberFormat異常？
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, LocationListener {
GoogleMap mMap;
LocationManager locationManager;
TextView tvStartRide, tvEndRide;
FloatingActionButton fabRate, fabLocation;
double start_latitude, start_longitude;
double end_latitude, end_longitude;
long start_time, end_time;
float baseRate, rate;
float distance;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
//Getting BaseRate and Rate from SetFareActivity
/** Bundle bundle = this.getIntent().getExtras();
if(bundle!=null) {
BaseRate = bundle.getString("baseRate");
Rate =bundle.getString("rate");
baseRate=Float.parseFloat(BaseRate);
rate=Float.parseFloat(Rate);
}
else
Toast.makeText(getApplicationContext(),"Nothing Recieved",Toast.LENGTH_SHORT).show(); **/
//start ride Methods
tvStartRide = (TextView) findViewById(R.id.tvStartRide);
tvStartRide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LocationManager locationManager = (LocationManager)
getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// Activity#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for Activity#requestPermissions for more details.
return;
}
}
Location location = locationManager.getLastKnownLocation(bestProvider);
start_latitude = location.getLatitude();
start_longitude = location.getLongitude();
start_time = System.currentTimeMillis();
LatLng latLng = new LatLng(start_latitude, start_longitude);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_VIOLET));
markerOptions.position(latLng);
mMap.addMarker(new MarkerOptions().position(latLng).title("Start Point").draggable(true));
tvStartRide.setVisibility(View.GONE);
tvEndRide.setVisibility(View.VISIBLE);
}
});
//End Ride Methods
tvEndRide = (TextView) findViewById(R.id.tvEndRide);
tvEndRide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LocationManager locationManager = (LocationManager)
getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// Activity#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for Activity#requestPermissions for more details.
return;
}
}
Location location = locationManager.getLastKnownLocation(bestProvider);
end_latitude = location.getLatitude();
end_longitude = location.getLongitude();
LatLng latLng = new LatLng(end_latitude, end_longitude);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
markerOptions.position(latLng);
mMap.addMarker(markerOptions);
end_time = System.currentTimeMillis();
float travel_time = (end_time - start_time)/60000;
Location startLocation = new Location("Start Location");
startLocation.setLatitude(start_latitude);
startLocation.setLongitude(start_longitude);
Location endLocation = new Location("End Location");
endLocation.setLatitude(end_latitude);
endLocation.setLongitude(end_longitude);
distance = startLocation.distanceTo(endLocation);
float fare = (baseRate+((distance/1000)*rate)+(travel_time*2));
tvEndRide.setVisibility(View.GONE);
AlertDialog.Builder alertdialogue = new AlertDialog.Builder(MapsActivity.this);
alertdialogue.setTitle("Fare");
alertdialogue.setIcon(R.mipmap.ic_launcher);
alertdialogue.setMessage("Distance travelled is: "+distance + " metres \n Time travelled is: "+travel_time+" minutes \n fare is: "+fare+" INR");
alertdialogue.setNeutralButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
});alertdialogue.show();
tvStartRide.setVisibility(View.VISIBLE);
}
});
//Rate Methods
fabRate = (FloatingActionButton) findViewById(R.id.fabRate);
fabRate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), SetFareRate.class);
startActivityForResult(i,2);
}
});
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(map);
mapFragment.getMapAsync(this);
//Get current Location Methods
fabLocation = (FloatingActionButton) findViewById(R.id.fabLocation);
fabLocation.setImageResource(R.drawable.ic_gps_fixed_black_24dp);
fabLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mMap.setMyLocationEnabled(true);
mMap.animateCamera(CameraUpdateFactory.zoomTo(16));
}
});
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mMap.setMyLocationEnabled(true);
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 20000, 0, (LocationListener) this);
}
@Override
public void onLocationChanged(Location location) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
mMap.setBuildingsEnabled(true);
mMap.setIndoorEnabled(true);
mMap.setBuildingsEnabled(true);
mMap.setTrafficEnabled(true);
mMap.getUiSettings().isMyLocationButtonEnabled();
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(16));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==2){
String BaseRate = data.getStringExtra("baseRate");
String Rate = data.getStringExtra("rate");
baseRate = Float.valueOf(BaseRate);
rate = Float.valueOf(Rate);
}
}
}
我的第二個活動是這樣的：
：public class SetFareRate extends AppCompatActivity {
EditText etBaseRate,etRate;
TextView tvSubmit;
@Override
protected void onCreate(@Nullable final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_setfare);
etBaseRate= (EditText) findViewById(R.id.etBaseRate);
etRate= (EditText) findViewById(R.id.etRate);
tvSubmit= (TextView) findViewById(R.id.tvSubmit);
tvSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String baseRate = etBaseRate.getText().toString();
String rate = etRate.getText().toString();
Intent i = new Intent();
i.putExtra("baseRate",baseRate);
i.putExtra("rate",rate);
setResult(2,i);
Toast.makeText(getApplicationContext(),"Rate Submitted sucessfully",Toast.LENGTH_SHORT).show();
}
});
}
}
我在獲得數字格式異常
baseRate = Float.valueOf(BaseRate);
rate = Float.valueOf(Rate);
in onActvityResult in first Activity。
logcat的是：
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=2, result=2, data=Intent { (has extras) }} to activity {me.nikantchaudhary.taxifare/me.nikantchaudhary.taxifare.MapsActivity}: java.lang.NumberFormatException: Invalid float: ""
at android.app.ActivityThread.deliverResults(ActivityThread.java:3544)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3587)
at android.app.ActivityThread.access$1300(ActivityThread.java:147)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1334)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5237)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
Caused by: java.lang.NumberFormatException: Invalid float: ""
at java.lang.StringToReal.invalidReal(StringToReal.java:63)
at java.lang.StringToReal.parseFloat(StringToReal.java:308)
at java.lang.Float.parseFloat(Float.java:306)
at java.lang.Float.valueOf(Float.java:343)
at me.nikantchaudhary.taxifare.MapsActivity.onActivityResult(MapsActivity.java:291)
at android.app.Activity.dispatchActivityResult(Activity.java:6184)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3540)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3587)
at android.app.ActivityThread.access$1300(ActivityThread.java:147)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1334)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5237)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
請Help.I我沒有得到任何線索，如何刪除此。
很明顯，該字符串值爲空。但是if語句或try catch。或者，輸入一個值 –
無效浮點數：看起來可能是類型不匹配？ – hellyale
http://stackoverflow.com/a/39850130/4723795 – xenteros