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我的應用程序應該讓用戶輸入緯度和經度值，並且MapActivity打開以這些座標爲圓心並在該區域繪製一個圓。出於某種原因，無論將哪個座標對發送到MapActivity，他的地圖總是以非洲附近海洋中間的一個點爲中心。谷歌地圖顯示不正確的座標（Android）
這個應用程序的功能直到最近才用得很好，但應用程序的其他功能工作得很好。用戶也可以選擇一個位置來圍繞地圖的中心，代碼基本上是相同的，除了放入MapActivity軟件包的緯度和經度值被硬編碼，而不是由用戶輸入。
更令人困惑的是，MapActivity接收用戶輸入的值很好，但它不會移動到該位置。我使用logcat來確保MapActivity獲得正確的值。我目前使用Android Studio version 1.2.1.1
這裏
是地圖活動代碼（編輯包含所有的代碼）
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
private LocationRequest mLocationRequest;
private GoogleApiClient mGoogleApiClient;
private Location mCurrentLocation;
private double targetLat;
private double targetLon;
private double latRandom;
private double lonRandom;
private int radius;
private int circleState;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
Bundle b = getIntent().getExtras();
targetLat = b.getDouble("lat");
targetLon = b.getDouble("lon");
Log.i("MapActivity","targetLat = "+targetLat);
Log.i("MapActivity","targetLon = "+targetLon);
radius = getIntent().getExtras().getInt("rad");
setUpMapIfNeeded();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
/**
* Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
* installed) and the map has not already been instantiated.. This will ensure that we only ever
* call {@link #setUpMap()} once when {@link #mMap} is not null.
* <p/>
* If it isn't installed {@link SupportMapFragment} (and
* {@link com.google.android.gms.maps.MapView MapView}) will show a prompt for the user to
* install/update the Google Play services APK on their device.
* <p/>
* A user can return to this FragmentActivity after following the prompt and correctly
* installing/updating/enabling the Google Play services. Since the FragmentActivity may not
* have been completely destroyed during this process (it is likely that it would only be
* stopped or paused), {@link #onCreate(Bundle)} may not be called again so we should call this
* method in {@link #onResume()} to guarantee that it will be called.
*/
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
/**
* This is where we can add markers or lines, add listeners or move the camera. In this case, we
* just add a marker near Africa.
* <p/>
* This should only be called once and when we are sure that {@link #mMap} is not null.
*/
private void setUpMap() {
mMap.setMapType(MAP_TYPE_HYBRID); //set map type
double shiftFactor = .0001;
int color = getIntent().getExtras().getInt("color");
while(findDistance(targetLat,targetLon,targetLat+shiftFactor,targetLon+shiftFactor)<radius){
shiftFactor+=.0001;
}
latRandom = (Math.random()*shiftFactor);
lonRandom = (Math.random()*shiftFactor);
int rand2 = (int)(Math.random()*2)+1;
if(rand2==1){
latRandom = 0 - latRandom;
}
rand2 = (int)(Math.random()*2)+1;
if(rand2==1){
lonRandom = 0 - lonRandom;
}
LatLng loc = new LatLng(targetLat+latRandom,targetLon + lonRandom); //lat and long values for target(shift)
CircleOptions circOpt = new CircleOptions(); //circle appearance
circOpt.center(loc).radius(radius);
circOpt.strokeWidth(0);
circOpt.fillColor(color);
mMap.addCircle(circOpt);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(loc, 19)); //move screen to target(shift)
mMap.setMyLocationEnabled(true);
circleState=3;
}
@Override
protected void onStart(){
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onStop(){
super.onStart();
mGoogleApiClient.disconnect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(1000);
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
Toast.makeText(this,"Connection Suspended", Toast.LENGTH_SHORT).show();
}
@Override
public void onLocationChanged(Location location) {
double lat = location.getLatitude();
double lon = location.getLongitude();
double difference = findDistance(lat,lon,targetLat,targetLon);
if(difference<radius && difference > 4&& circleState==3){
mMap.clear();
LatLng loc = new LatLng(targetLat+latRandom,targetLon + lonRandom); //lat and long values for target(shift)
CircleOptions circOpt = new CircleOptions(); //circle appearance
circOpt.center(loc).radius(radius);
circOpt.strokeWidth(0);
circOpt.fillColor(Color.argb(120, 0, 0, 255));
mMap.addCircle(circOpt);
circleState = 2;
}
else if(difference<4&&difference > 2 && circleState==2){
mMap.clear();
LatLng loc = new LatLng(targetLat,targetLon); //lat and long values for target(not shifted)
CircleOptions circOpt = new CircleOptions(); //circle appearance
circOpt.center(loc).radius(4); //Make smaller search circle
circOpt.strokeWidth(0);
circOpt.fillColor(Color.argb(120, 0, 255, 0));
mMap.addCircle(circOpt);
circleState = 1;
}
else if(difference<3&&circleState==1){
mMap.addCircle(new CircleOptions().center(new LatLng(targetLat,targetLon)).radius(1).strokeWidth(0).fillColor(Color.RED));
circleState=0;
}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Toast.makeText(this,"Connection Failed",Toast.LENGTH_SHORT).show();
}
//Precondition: two pairs of real coordinates
public double findDistance(double lat1,double lon1, double lat2, double lon2){
final int EARTH_RADIUS = 6371000;
double a = Math.sin(Math.toRadians(lat2 - lat1)/2)*Math.sin(Math.toRadians(lat2 - lat1)/2)+
Math.cos(Math.toRadians(lat1))*Math.cos(Math.toRadians(lat2))*
Math.sin(Math.toRadians(lon2 - lon1)/2)*Math.sin(Math.toRadians(lon2 - lon1)/2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
return EARTH_RADIUS * c ; //Return the distance
}
}
下面是與列表中的活動代碼的位置可以選擇硬編碼值。目前只有一個位置
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quest_select);
listView = (ListView)findViewById(R.id.list);
String [] places = new String[] {"Light"}; //add more presets here, add coordinates to switch statement
ArrayAdapter<String>adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,android.R.id.text1,places);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch(position){
case 0:
startMap(view,43.005993,-75.984314);
break;
default:
Toast.makeText(getApplicationContext(), "Not a valid selection",Toast.LENGTH_SHORT).show();
break;
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_quest_select, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void startMap(View view,double latVal,double lonVal){
Intent intent = new Intent(this, MapActivity.class);
Bundle b = new Bundle();
b.putDouble("lat",latVal);
b.putDouble("lon", lonVal);
b.putInt("rad", 50);
b.putInt("color", Color.argb(120,0,255,0));
intent.putExtras(b);
startActivity(intent);
}
最後，這裏是用戶輸入緯度和經度值的活動中的代碼。 （編輯包含整個代碼）
public class CustomOptions extends ActionBarActivity {
private Spinner colorSelect;
private EditText latSet;
private EditText lonSet;
private double lat, lon;
private SeekBar radSet;
private TextView currentRadius;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_custom_options);
colorSelect = (Spinner) findViewById(R.id.spinner1);
String [] colors = new String[]{"Red","Blue","Green","Orange"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,colors);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
colorSelect.setAdapter(adapter);
latSet = (EditText)findViewById(R.id.editText);
lonSet = (EditText)findViewById(R.id.editText2);
radSet = (SeekBar)findViewById(R.id.seekBar);
radSet.setProgress(50);
radSet.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
currentRadius.setText(String.valueOf(radSet.getProgress())+"m");
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
currentRadius = (TextView)findViewById(R.id.currentRadius);
currentRadius.setText(radSet.getProgress() + "m");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_custom_options, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void startMap(View view){
if(checkValidity()&&Math.abs(lat)<=90&&Math.abs(lon)<=180) {
Intent intent = new Intent(this, MapActivity.class);
Bundle b = new Bundle();
b.putDouble("lat",lat);
b.putDouble("lon", lon);
b.putInt("rad", radSet.getProgress());
switch(colorSelect.getSelectedItemPosition()){
case 0:
b.putInt("color", Color.argb(120, 255, 0, 0));
break;
case 1:
b.putInt("color", Color.argb(120, 0, 255, 0));
break;
case 2:
b.putInt("color", Color.argb(120, 0, 0, 255));
break;
case 3:
b.putInt("color",Color.argb(120,255,140,0));
break;
default:
Toast.makeText(this,"Abort Captain!",Toast.LENGTH_SHORT).show();
break;
}
intent.putExtras(b);
Toast.makeText(this,"starting activity",Toast.LENGTH_SHORT).show();
startActivity(intent);
}
else{
if(Math.abs(lat)>90) Toast.makeText(this, "Invalid Latitude Value",Toast.LENGTH_SHORT).show();
if(Math.abs(lat)>90) Toast.makeText(this, "Invalid Longitude Value",Toast.LENGTH_SHORT).show();
}
}
public boolean checkValidity() {
if(TextUtils.isEmpty(latSet.getText().toString())){
Toast.makeText(this, "Set a latitude value",Toast.LENGTH_SHORT).show();
return false;
}
if(TextUtils.isEmpty(lonSet.getText().toString())){
Toast.makeText(this, "Set a longitude value",Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
}
請讓我知道是否有再我應該提供的信息。
聽起來好像你的值是（0，0），那時你將地圖居中並添加圓圈。在執行此操作時爲這些值添加日誌記錄。另外，將該代碼部分添加到您的問題中。 –
我使用日誌記錄來查看地圖活動打開後日期和緯度值是多少，日誌顯示它正確接收值。我不認爲將地圖居中是問題，因爲列表中的活動使用與自定義活動相同的方式打包lat和lon值，並且該活動完美無缺。我想編輯我的帖子以添加更多我的代碼來準確顯示我在做什麼，但是我無法找到如何編輯帖子的生活。 – Ben
小編輯鏈接，您問題的左下角。 –