我是Android开发人员的新手，我正在尝试完成一个Android应用程序，我可以使用“自动完成”搜索位置并在Google地图上标记该位置。
这是我的 activity_city_maps.xml 文件
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/constraintLayout_map_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CityMapsActivity">
<AutoCompleteTextView
android:id="@+id/editText_source"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:ems="10"
android:hint="Select Source"
android:inputType="textPersonName"
app:layout_constraintEnd_toStartOf="@+id/button_source_update"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button_source_update"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:text="Set Source"
app:layout_constraintBaseline_toBaselineOf="@+id/editText_source"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/editText_source" />
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button_source_update"
tools:context=".CityMapsActivity" />
</android.support.constraint.ConstraintLayout>
这是我的 CityMapsActivity.java 文件
package com.softvision.gotogether.app;
//Imports hidden
public class CityMapsActivity extends FragmentActivity implements
GoogleMap.OnMyLocationButtonClickListener,
GoogleMap.OnMyLocationClickListener,
OnMapReadyCallback,
OnRequestPermissionsResultCallback,
GoogleApiClient.OnConnectionFailedListener,
GoogleApiClient.ConnectionCallbacks{
/* AUTO-COMPLETE PROPERTIES
* ----------------------------------------------------------------------------------------------*/
private static final String LOG_TAG = "CityMapsActivity";
private GoogleApiClient client;
private static final int GOOGLE_API_CLIENT_ID = 0;
private static final LatLngBounds BOUNDS_MOUNTAIN_VIEW = new LatLngBounds(
new LatLng(37.398160, -122.180831), new LatLng(37.430610, -121.972090));
private PlaceArrayAdapter mPlaceArrayAdapter;
private AutoCompleteTextView editTextSource;
/* MAP PROPERTIES
* ----------------------------------------------------------------------------------------------*/
private GoogleMap mMap;
private ArrayList<LatLng> markerPoints = new ArrayList<>();
//Request code for location permission request.
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1;
//Flag indicating whether a requested permission has been denied after returning in
private boolean mPermissionDenied = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_city_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
// Location Auto complete
client = new GoogleApiClient.Builder(CityMapsActivity.this)
.addApi(Places.GEO_DATA_API)
.enableAutoManage(this, GOOGLE_API_CLIENT_ID, this)
.addConnectionCallbacks(this)
.build();
editTextSource = (AutoCompleteTextView) findViewById(R.id.editText_source);
editTextSource.setThreshold(3);
editTextSource.setOnItemClickListener(autoCompleteClickListener);
mPlaceArrayAdapter = new PlaceArrayAdapter(this, android.R.layout.simple_list_item_1,BOUNDS_MOUNTAIN_VIEW, null);
editTextSource.setAdapter(mPlaceArrayAdapter);
}
/* ----------------------------------------------------------------------------------------------------
BEGIN: LOCATION AUTO COMPLETE SECTION
------------------------------------------------------------------------------------------------------*/
private AdapterView.OnItemClickListener autoCompleteClickListener = new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
final PlaceArrayAdapter.PlaceAutocomplete item = mPlaceArrayAdapter.getItem(position);
final String placeId = String.valueOf(item.placeId);
Log.i(LOG_TAG, "Selected: " + item.description);
PendingResult<PlaceBuffer> placeResult = Places.GeoDataApi.getPlaceById(client, placeId);
placeResult.setResultCallback(mUpdatePlaceDetailsCallback);
Log.i(LOG_TAG, "Fetching details for ID: " + item.placeId);
}
};
private ResultCallback<PlaceBuffer> mUpdatePlaceDetailsCallback
= new ResultCallback<PlaceBuffer>() {
@Override
public void onResult(PlaceBuffer places) {
if (!places.getStatus().isSuccess()) {
Log.e(LOG_TAG, "Place query did not complete. Error: " +
places.getStatus().toString());
return;
}
// Selecting the first object buffer.
final Place place = places.get(0);
/*
CharSequence attributions = places.getAttributions();
mNameTextView.setText(Html.fromHtml(place.getName() + ""));
mAddressTextView.setText(Html.fromHtml(place.getAddress() + ""));
mIdTextView.setText(Html.fromHtml(place.getId() + ""));
mPhoneTextView.setText(Html.fromHtml(place.getPhoneNumber() + ""));
mWebTextView.setText(place.getWebsiteUri() + "");
if (attributions != null) {
mAttTextView.setText(Html.fromHtml(attributions.toString()));
}*/
}
};
/* ----------------------------------------------------------------------------------------------------
END: LOCATION AUTO COMPLETE SECTION
------------------------------------------------------------------------------------------------------*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Enable my location option for map.
enableMyLocation();
mMap.setOnMyLocationButtonClickListener(this);
mMap.setOnMyLocationClickListener(this);
// Creating Markers by clicking on map
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
MarkerOptions options = new MarkerOptions();
if(markerPoints.size()>1){
markerPoints.clear();
mMap.clear();
}
// Add new Point
markerPoints.add(latLng);
options.position(latLng);
if(markerPoints.size()==1){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
options.title("Source");
editTextSource.setText(getCompleteAddressString(latLng.latitude, latLng.longitude));
}else if(markerPoints.size()==2){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
options.title("Destination");
}
mMap.addMarker(options);
if(markerPoints.size() >= 2){
LatLng origin = markerPoints.get(0);
LatLng dest = markerPoints.get(1);
String url = getDirectionsUrl(origin, dest);
DownloadTask downloadTask = new DownloadTask();
downloadTask.execute(url);
}
}
});
mMap.setOnMarkerClickListener((new GoogleMap.OnMarkerClickListener(){
@Override
public boolean onMarkerClick(Marker marker) {
if(marker.isInfoWindowShown()) {
marker.hideInfoWindow();
} else {
marker.showInfoWindow();
}
//.setText(myMarker.getTitle()); //Change TextView text here like this
return true;
}
}));
// Add a marker in Sydney and move the camera
/*
LatLng destination = new LatLng(12.354509, 76.603085);
mMap.addMarker(new MarkerOptions().position(destination).title("Softvision, LLC (DBA Software Paradigms Infotech Pvt Ltd)"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(destination));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(destination.latitude, destination.longitude), 12.0f));
*/
}
@Override
public void onMyLocationClick(@NonNull Location location) {
Toast.makeText(this, "Current location:\n" + location, Toast.LENGTH_LONG).show();
}
private void enableMyLocation() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// Permission to access the location is missing.
PermissionUtils.requestPermission(this, LOCATION_PERMISSION_REQUEST_CODE, Manifest.permission.ACCESS_FINE_LOCATION, true);
} else if (mMap != null) {
// Access to the location has been granted to the app.
mMap.setMyLocationEnabled(true);
}
}
@Override
public boolean onMyLocationButtonClick() {
Toast.makeText(this, "Searching for location...", Toast.LENGTH_SHORT).show();
// Return false so that we don't consume the event and the default behavior still occurs
// (the camera animates to the user's current position).
return false;
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,@NonNull int[] grantResults) {
if (requestCode != LOCATION_PERMISSION_REQUEST_CODE) {
return;
}
if (PermissionUtils.isPermissionGranted(permissions, grantResults, Manifest.permission.ACCESS_FINE_LOCATION)) {
// Enable the my location layer if the permission has been granted.
enableMyLocation();
} else {
// Display the missing permission error dialog when the fragments resume.
mPermissionDenied = true;
}
}
@Override
protected void onResumeFragments() {
super.onResumeFragments();
if (mPermissionDenied) {
// Permission was not granted, display error dialog.
showMissingPermissionError();
mPermissionDenied = false;
}
}
private void showMissingPermissionError() {
PermissionUtils.PermissionDeniedDialog.newInstance(true).show(getSupportFragmentManager(), "dialog");
}
/* -------------------------------------------------------------------------------------------------------------
BEGIN [GoogleApiClient] :Overrides for :
GoogleApiClient.OnConnectionFailedListener,
GoogleApiClient.ConnectionCallback
---------------------------------------------------------------------------------------------------------------*/
@Override
public void onConnected(@Nullable Bundle bundle) {
mPlaceArrayAdapter.setGoogleApiClient(client);
Log.i(LOG_TAG, "Google Places API connected.");
}
@Override
public void onConnectionSuspended(int i) {
mPlaceArrayAdapter.setGoogleApiClient(null);
Log.e(LOG_TAG, "Google Places API connection suspended.");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Log.e(LOG_TAG, "Google Places API connection failed with error code: "
+ connectionResult.getErrorCode());
Toast.makeText(this,
"Google Places API connection failed with error code:" + connectionResult.getErrorCode(), Toast.LENGTH_LONG)
.show();
}
/* -------------------------------------------------------------------------------------------------------------
END [GoogleApiClient]
---------------------------------------------------------------------------------------------------------------*/
/*-------------------------------------------------------------------------------------------------------------*/
/* Map Utility Section */
/*-------------------------------------------------------------------------------------------------------------*/
private String getCompleteAddressString(double LATITUDE, double LONGITUDE) {
String strAdd = "";
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
try {
List<Address> addresses = geocoder.getFromLocation(LATITUDE,LONGITUDE, 1);
if (addresses != null) {
Address returnedAddress = addresses.get(0);
StringBuilder strReturnedAddress = new StringBuilder("");
for (int i = 0; i < returnedAddress.getMaxAddressLineIndex(); i++) {
strReturnedAddress.append(returnedAddress.getAddressLine(i)).append(",");
}
strAdd = strReturnedAddress.toString();
} else {
strAdd = "No Address returned!";
}
} catch (Exception e) {
e.printStackTrace();
strAdd = e.getMessage();
}
return strAdd;
}
private String getDirectionsUrl(LatLng origin,LatLng dest){
// Origin of route
String str_origin = String.format("origin=%s,%s", origin.latitude, origin.longitude);
// Destination of route
String str_dest = "destination="+dest.latitude+","+dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin+"&"+str_dest+"&"+sensor;
// Output format
String output = "json";
String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;
return url;
}
@SuppressLint("LongLogTag")
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
// Fetches data from url passed
private class DownloadTask extends AsyncTask<String, Void, String> {
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try{
// Fetching the data from web service
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>>> {
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try{
jObject = new JSONObject(jsonData[0]);
GmapUtility parser = new GmapUtility();
// Starts parsing data
routes = parser.parseJson(jObject);
}catch(Exception e){
e.printStackTrace();
}
return routes;
}
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> result) {
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = null;
MarkerOptions markerOptions = new MarkerOptions();
// Traversing through all the routes
for(int i=0;i<result.size();i++){
points = new ArrayList<LatLng>();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for(int j=0;j<path.size();j++){
HashMap<String,String> point = path.get(j);
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
}
// Adding all the points in the route to LineOptions
lineOptions.addAll(points)
.width(12)
.color(Color.parseColor("#05b1fb"))//Google maps blue color
.geodesic(true);
}
// Drawing polyline in the Google Map for the i-th route
mMap.addPolyline(lineOptions);
}
}
}
这是我的 PlaceArrayAdapter.java 文件
package com.softvision.gotogether.app;
/*imports hidden*/
public class PlaceArrayAdapter
extends ArrayAdapter<PlaceArrayAdapter.PlaceAutocomplete> implements Filterable {
private static final String TAG = "PlaceArrayAdapter";
private GoogleApiClient mGoogleApiClient;
private AutocompleteFilter mPlaceFilter;
private LatLngBounds mBounds;
private ArrayList<PlaceAutocomplete> mResultList;
/**
* Constructor
*
* @param context Context
* @param resource Layout resource
* @param bounds Used to specify the search bounds
* @param filter Used to specify place types
*/
public PlaceArrayAdapter(Context context, int resource, LatLngBounds bounds,AutocompleteFilter filter) {
super(context, resource);
mBounds = bounds;
mPlaceFilter = filter;
}
public void setGoogleApiClient(GoogleApiClient googleApiClient) {
if (googleApiClient == null || !googleApiClient.isConnected()) {
mGoogleApiClient = null;
} else {
mGoogleApiClient = googleApiClient;
}
}
@Override
public int getCount() {
return mResultList.size();
}
@Override
public PlaceAutocomplete getItem(int position) {
return mResultList.get(position);
}
private ArrayList<PlaceAutocomplete> getPredictions(CharSequence constraint) {
if (mGoogleApiClient != null) {
Log.i(TAG, "Executing autocomplete query for: " + constraint);
PendingResult<AutocompletePredictionBuffer> results =
Places.GeoDataApi.getAutocompletePredictions(mGoogleApiClient, constraint.toString(),mBounds, mPlaceFilter);
// Wait for predictions, set the timeout.
AutocompletePredictionBuffer autocompletePredictions = results.await(60, TimeUnit.SECONDS);
final Status status = autocompletePredictions.getStatus();
if (!status.isSuccess()) {
Toast.makeText(getContext(), "Error: " + status.toString(),Toast.LENGTH_SHORT).show();
Log.e(TAG, "Error getting place predictions: " + status.toString());
autocompletePredictions.release();
return null;
}
Log.i(TAG, "Query completed. Received " + autocompletePredictions.getCount()
+ " predictions.");
Iterator<AutocompletePrediction> iterator = autocompletePredictions.iterator();
ArrayList resultList = new ArrayList<>(autocompletePredictions.getCount());
while (iterator.hasNext()) {
AutocompletePrediction prediction = iterator.next();
resultList.add(new PlaceAutocomplete(prediction.getPlaceId(),prediction.getFullText(null)));
}
// Buffer release
autocompletePredictions.release();
return resultList;
}
Log.e(TAG, "Google API client is not connected.");
return null;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint != null) {
// Query the autocomplete API for the entered constraint
mResultList = getPredictions(constraint);
if (mResultList != null) {
// Results
results.values = mResultList;
results.count = mResultList.size();
}
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count > 0) {
// The API returned at least one result, update the data.
notifyDataSetChanged();
} else {
// The API did not return any results, invalidate the data set.
notifyDataSetInvalidated();
}
}
};
return filter;
}
class PlaceAutocomplete {
public CharSequence placeId;
public CharSequence description;
PlaceAutocomplete(CharSequence placeId, CharSequence description) {
this.placeId = placeId;
this.description = description;
}
@Override
public String toString() {
return description.toString();
}
}
}
在这里，当我构建应用程序时，我在Gradle Console上收到以下构建警告，并且Build成功：
:app:compileDebugJavaWithJavac
E:\AndroidApps\GoTogether\app\src\main\java\com\softvision\gotogether\app\PlaceArrayAdapter.java:88: warning: [unchecked] unchecked call to add(E) as a member of the raw type ArrayList
resultList.add(new PlaceAutocomplete(prediction.getPlaceId(),prediction.getFullText(null)));
^
where E is a type-variable:
E extends Object declared in class ArrayList
E:\AndroidApps\GoTogether\app\src\main\java\com\softvision\gotogether\app\PlaceArrayAdapter.java:92: warning: [unchecked] unchecked conversion
return resultList;
^
required: ArrayList<PlaceArrayAdapter.PlaceAutocomplete>
found: ArrayList
E:\AndroidApps\GoTogether\app\src\main\java\com\softvision\gotogether\app\GmapUtility.java:47: warning: [unchecked] unchecked call to add(E) as a member of the raw type List
path.add(hm);
^
where E is a type-variable:
E extends Object declared in interface List
E:\AndroidApps\GoTogether\app\src\main\java\com\softvision\gotogether\app\GmapUtility.java:50: warning: [unchecked] unchecked method invocation: method add in interface List is applied to given types
routes.add(path);
^
required: E
found: List
where E is a type-variable:
E extends Object declared in interface List
E:\AndroidApps\GoTogether\app\src\main\java\com\softvision\gotogether\app\GmapUtility.java:50: warning: [unchecked] unchecked conversion
routes.add(path);
^
required: E
found: List
where E is a type-variable:
E extends Object declared in interface List
5 warnings
当我在我的设备上运行应用程序时，它正在崩溃。运行控制台上的错误如下：
Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib64, /vendor/lib64]]
V/BoostFramework: BoostFramework() : mPerf = null
D/ViewRootImpl@27d899d[CityMapsActivity]: ViewPostImeInputStage processPointer 1
D/InputMethodManager: ISS - flag : 0Pid : 21012 view : com.softvision.gotogether.app
D/ViewRootImpl@27d899d[CityMapsActivity]: MSG_RESIZED: ci=Rect(0, 42 - 0, 0) vi=Rect(0, 42 - 0, 494) or=1
I/PlaceArrayAdapter: Executing autocomplete query for: usa
E/PlaceArrayAdapter: Error getting place predictions: Status{statusCode=ERROR, resolution=null}
请帮我解决这个问题。
答案 0 :(得分：1)
尝试在multiDexEnabled true内的应用Gradle文件中设置android {defaultConfig{}}。
我建议使用默认的ArrayAdapter而不是AutoCompleteTextView的自定义适配器。
修改
使用ArrayAdapter的标准方法是：
// The sample String array, you can use either this or List<String>
String[] countries = getResources().getStringArray(R.array.list_of_countries);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, countries);
editTextSource.setAdapter(adapter);
AutoCompleteTextView的Android文档：https://developer.android.com/reference/android/widget/AutoCompleteTextView.html
有用的教程：https://www.tutorialspoint.com/android/android_auto_complete.htm