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我正在尝试制作一个指南针，并且要在Textview中打印出当前位置。但是，当我这样做时，它给了我德黑兰（伊朗）的经纬度，这是不正确的。为什么我得到错误的位置？
public class Kompas extends AppCompatActivity implements AnimationListener,
OnSharedPreferenceChangeListener, ConstantUtilInterface {
private boolean faceUp = true;
private boolean gpsLocationFound = true;
private String location_line2 = "";
public Location currentLocation = null;
private double lastTargetAngle = 0;
private double lastNorthAngle = 0;
private double lastTargetAngleFromN = 0;
// This animation is used to rotate north and target images
private RotateAnimation animation;
private ImageView compassImageView;
private ImageView locationImageView;
private final LocationCompassManager locationCompassManager = new LocationCompassManager(this);
private boolean angleSignaled = false;
private Timer timer = null;
private SharedPreferences perfs;
public boolean isRegistered = false;
public boolean isGPSRegistered = false;
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message message) {
if (message.what == ROTATE_IMAGES_MESSAGE) {
Bundle bundle = message.getData();
boolean isTargetChanged = bundle.getBoolean(IS_TARGET_CHANGED);
boolean isCompassChanged = bundle
.getBoolean(IS_COMPASS_CHANGED);
double targetNewAngle = 0;
double compassNewAngle = 0;
if (isTargetChanged)
targetNewAngle = (Double) bundle.get(TARGET_BUNDLE_DELTA_KEY);
if (isCompassChanged) {
compassNewAngle = (Double) bundle
.get(COMPASS_BUNDLE_DELTA_KEY);
}
// This
syncTargetAndNorthArrow(compassNewAngle, targetNewAngle,
isCompassChanged, isTargetChanged);
angleSignaled = false;
}
}
};
public void setLocationText(String textToShow) {
this.location_line2 = textToShow;
}
private TimerTask getTimerTask() {
TimerTask timerTask = new TimerTask() {
@Override
public void run() {
if (angleSignaled && !ConcurrencyUtil.isAnyAnimationOnRun()) {
// numAnimationOnRun += 2;
Map<String, Double> newAnglesMap = locationCompassManager
.fetchDeltaAngles();
Double newNorthAngle = newAnglesMap
.get(LocationCompassManager.NORTH_CHANGED_MAP_KEY);
Double newTargetAngle = newAnglesMap
.get(LocationCompassManager.TARGET_CHANGED_MAP_KEY);
Message message = mHandler.obtainMessage();
message.what = ROTATE_IMAGES_MESSAGE;
Bundle b = new Bundle();
if (newNorthAngle == null) {
b.putBoolean(IS_COMPASS_CHANGED, false);
} else {
ConcurrencyUtil.incrementAnimation();
b.putBoolean(IS_COMPASS_CHANGED, true);
b.putDouble(COMPASS_BUNDLE_DELTA_KEY, newNorthAngle);
}
if (newTargetAngle == null) {
b.putBoolean(IS_TARGET_CHANGED, false);
} else {
ConcurrencyUtil.incrementAnimation();
b.putBoolean(IS_TARGET_CHANGED, true);
b.putDouble(TARGET_BUNDLE_DELTA_KEY, newTargetAngle);
}
message.setData(b);
mHandler.sendMessage(message);
} else if (ConcurrencyUtil.getNumAimationsOnRun() < 0) {
}
}
};
return timerTask;
}
private void schedule() {
if (timer == null) {
timer = new Timer();
this.timer.schedule(getTimerTask(), 0, 200);
} else {
timer.cancel();
timer = new Timer();
timer.schedule(getTimerTask(), 0, 200);
}
}
private void cancelSchedule() {
if (timer == null)
return;
// timer.cancel();
}
private void onInvalidateLocation(String message) {
}
private void requestForValidationOfLocation() {
// TextView textView = (TextView)
// findViewById(R.id.location_text_line1);
TextView textView2 = (TextView) findViewById(R.id.location_text_line2);
ImageView arrow = ((ImageView) findViewById(R.id.arrowImage));
ImageView compass = ((ImageView) findViewById(R.id.compassImage));
ImageView frame = ((ImageView) findViewById(R.id.frameImage));
FrameLayout targetFrame = ((FrameLayout) findViewById(R.id.targetLayout));
LinearLayout noLocationLayout = ((LinearLayout) findViewById(R.id.noLocationLayout));
if (faceUp && (gpsLocationFound || currentLocation != null)) {
textView2.setVisibility(View.VISIBLE);
textView2.setText(location_line2);
((LinearLayout) findViewById(R.id.textLayout))
.setVisibility(View.VISIBLE);
noLocationLayout.setVisibility(View.INVISIBLE);
targetFrame.setVisibility(View.VISIBLE);
arrow.setVisibility(View.VISIBLE);
compass.setVisibility(View.VISIBLE);
frame.setVisibility(View.VISIBLE);
} else {
if (!faceUp) {
onScreenDown();
} else if (!(gpsLocationFound || currentLocation != null)) {
onGPSOn();
}
}
}
private void onGPSOn() {
gpsLocationFound = false;
onInvalidateLocation(getString(R.string.no_location_yet));
}
public void onScreenDown() {
faceUp = false;
onInvalidateLocation(getString(R.string.screen_down_text));
}
public void onScreenUp() {
faceUp = true;
requestForValidationOfLocation();
}
public void onNewLocationFromGPS(Location location) {
gpsLocationFound = true;
currentLocation = location;
requestForValidationOfLocation();
}
private void onGPSOff(Location defaultLocation) {
currentLocation = defaultLocation;
gpsLocationFound = false;
requestForValidationOfLocation();
}
private String getLocationForPrint(double latitude, double longitude) {
int latDegree = (new Double(Math.floor(latitude))).intValue();
int longDegree = (new Double(Math.floor(longitude))).intValue();
String latEnd = getString(R.string.latitude_south);
String longEnd = getString(R.string.longitude_west);
if (latDegree > 0) {
latEnd = getString(R.string.latitude_north);
}
if (longDegree > 0) {
longEnd = getString(R.string.longitude_east);
}
double latSecond = (latitude - latDegree) * 100;
double latMinDouble = (latSecond * 3d/5d);
int latMinute = new Double(Math.floor(latMinDouble)).intValue();
double longSecond = (longitude - longDegree) * 100;
double longMinDouble = (longSecond * 3d/5d);
int longMinute = new Double(Math.floor(longMinDouble)).intValue();
return String.format(getString(R.string.geo_location_info), latDegree,
latMinute, latEnd, longDegree, longMinute, longEnd);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.kompas);
registerListeners();
Context context = getApplicationContext();
perfs = PreferenceManager.getDefaultSharedPreferences(context);
perfs.registerOnSharedPreferenceChangeListener(this);
String gpsPerfKey = getString(R.string.gps_pref_key);
TextView text1 = (TextView) findViewById(R.id.location_text_line2);
TextView text2 = (TextView) findViewById(R.id.noLocationText);
getLocationName(currentLocation.getLatitude(), currentLocation.getLongitude());
getSupportActionBar().setTitle("Qiblah");
getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#8b4513")));
boolean isGPS = false;
try {
isGPS = Boolean.parseBoolean(perfs.getString(gpsPerfKey, "false"));
} catch (ClassCastException e) {
isGPS = perfs.getBoolean(gpsPerfKey, false);
}
if (!isGPS) {
unregisterForGPS();
useDefaultLocation(perfs,
getString(R.string.state_location_pref_key));
} else {
registerForGPS();
onGPSOn();
}
this.locationImageView = (ImageView) findViewById(R.id.arrowImage);
this.compassImageView = (ImageView) findViewById(R.id.compassImage);
}
private void unregisterListeners() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
((LocationManager) getSystemService(Context.LOCATION_SERVICE))
.removeUpdates(locationCompassManager);
((LocationManager) getSystemService(Context.LOCATION_SERVICE))
.removeUpdates(locationCompassManager);
SensorManager mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
Sensor gsensor = mSensorManager
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
Sensor msensor = mSensorManager
.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
mSensorManager.unregisterListener(locationCompassManager, gsensor);
mSensorManager.unregisterListener(locationCompassManager, msensor);
cancelSchedule();
}
public void getLocationName(double lattitude, double longitude) {
}
private void registerForGPS() {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
criteria.setPowerRequirement(Criteria.POWER_LOW);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setSpeedRequired(false);
criteria.setCostAllowed(true);
LocationManager locationManager = ((LocationManager) getSystemService(Context.LOCATION_SERVICE));
String provider = locationManager.getBestProvider(criteria, true);
if (provider != null) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
locationManager.requestLocationUpdates(provider, MIN_LOCATION_TIME,
MIN_LOCATION_DISTANCE, locationCompassManager);
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
MIN_LOCATION_TIME, MIN_LOCATION_DISTANCE, locationCompassManager);
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, MIN_LOCATION_TIME,
MIN_LOCATION_DISTANCE, locationCompassManager);
Location location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null) {
location = ((LocationManager) getSystemService(Context.LOCATION_SERVICE))
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
if (location != null) {
locationCompassManager.onLocationChanged(location);
}
}
private void unregisterForGPS() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
((LocationManager) getSystemService(Context.LOCATION_SERVICE))
.removeUpdates(locationCompassManager);
}
private void registerListeners() {
SharedPreferences perfs = PreferenceManager
.getDefaultSharedPreferences(getApplicationContext());
if (perfs.getBoolean(getString(R.string.gps_pref_key), false)) {
registerForGPS();
} else {
useDefaultLocation(perfs,
getString(R.string.state_location_pref_key));
}
SensorManager mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
Sensor gsensor = mSensorManager
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
Sensor msensor = mSensorManager
.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
mSensorManager.registerListener(locationCompassManager, gsensor,
SensorManager.SENSOR_DELAY_GAME);
mSensorManager.registerListener(locationCompassManager, msensor,
SensorManager.SENSOR_DELAY_GAME);
schedule();
isRegistered = true;
}
@Override
protected void onResume() {
super.onResume();
registerListeners();
}
@Override
protected void onPause() {
super.onPause();
ConcurrencyUtil.setToZero();
ConcurrencyUtil.directionChangedLock.readLock();
unregisterListeners();
}
public void syncTargetAndNorthArrow(double northNewAngle,
double targetNewAngle, boolean northChanged, boolean targetChanged) {
if (northChanged) {
lastNorthAngle = rotateImageView(northNewAngle, lastNorthAngle,
compassImageView);
if (targetChanged == false && targetNewAngle != 0) {
lastTargetAngleFromN = targetNewAngle;
lastTargetAngle = rotateImageView(targetNewAngle + northNewAngle,
lastTargetAngle, locationImageView);
} else if (targetChanged == false && targetNewAngle == 0)
lastTargetAngle = rotateImageView(lastTargetAngleFromN
+ northNewAngle, lastTargetAngle, locationImageView);
}
if (targetChanged) {
lastTargetAngleFromN = targetNewAngle;
lastTargetAngle = rotateImageView(targetNewAngle + lastNorthAngle,
lastTargetAngle, locationImageView);
}
}
private double rotateImageView(double newAngle, double fromDegree,
ImageView imageView) {
newAngle = newAngle % 360;
double rotationDegree = fromDegree - newAngle;
rotationDegree = rotationDegree % 360;
long duration = new Double(Math.abs(rotationDegree) * 2000/360)
.longValue();
if (rotationDegree > 180)
rotationDegree -= 360;
FrameLayout frameLayout = (FrameLayout) findViewById(R.id.targetLayout);
float toDegree = new Double(newAngle % 360).floatValue();
final int width = Math.abs(frameLayout.getRight()
- frameLayout.getLeft());
final int height = Math.abs(frameLayout.getBottom()
- frameLayout.getTop());
LinearLayout main = (LinearLayout) findViewById(R.id.mainLayout);
float pivotX = width/2f;
float pivotY = height/2f;
animation = new RotateAnimation(new Double(fromDegree).floatValue(),
toDegree, pivotX, pivotY);
animation.setRepeatCount(0);
animation.setDuration(duration);
animation.setInterpolator(new LinearInterpolator());
animation.setFillEnabled(true);
animation.setFillAfter(true);
animation.setAnimationListener(this);
imageView.startAnimation(animation);
return toDegree;
}
public void signalForAngleChange() {
this.angleSignaled = true;
}
public void onAnimationEnd(Animation animation) {
if (ConcurrencyUtil.getNumAimationsOnRun() <= 0) {
} else {
ConcurrencyUtil.decrementAnimation();
}
schedule();
}
public void onAnimationRepeat(Animation animation) {
}
public void onAnimationStart(Animation animation) {
cancelSchedule();
}
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
String key) {
String gpsPerfKey = getString(R.string.gps_pref_key);
String defaultLocationPerfKey = getString(R.string.state_location_pref_key);
if (gpsPerfKey.equals(key)) {
boolean isGPS = false;
try {
isGPS = Boolean.parseBoolean(sharedPreferences.getString(key,
"false"));
} catch (ClassCastException e) {
isGPS = sharedPreferences.getBoolean(key, false);
}
if (isGPS) {
registerForGPS();
currentLocation = null;
onGPSOn();
} else {
useDefaultLocation(sharedPreferences, defaultLocationPerfKey);
unregisterForGPS();
}
} else if (defaultLocationPerfKey.equals(key)) {
sharedPreferences.edit().putBoolean(gpsPerfKey, false);
sharedPreferences.edit().commit();
unregisterForGPS();
useDefaultLocation(sharedPreferences, key);
}
}
private void useDefaultLocation(SharedPreferences perfs, String key) {
int defLocationID = Integer.parseInt(perfs.getString(key, ""
+ LocationEnum.MENU_TEHRAN.getId()));
LocationEnum locationEnum = LocationEnum.values()[defLocationID - 1];
Location location = locationEnum.getLocation();
locationCompassManager.onLocationChanged(location);
onGPSOff(location);
}
@Override
public void onBackPressed() {
finish();
}
}
我发现的方式是，我打印出城市名称和纬度/经度，他们给了我德黑兰。我已经在清单中写入了正确的权限，并且我的设备上的GPS /位置已打开。
你是什么意思与“它”给我？ GPS设备？或者你的方法getLocationForPrint（）？检查该方法的输入是否正确。 – AlexWien
方法getLocationForPrint（），我已经但我不明白为什么它给了我德黑兰 – Nasc