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Google지도 v2 예에서 googlemap.setMyLocationEnabled(true)을 사용하여 nullPointerException을 잘못 입력했는지 확실하지 않습니다.Google지도 v2 setMyLocationEnabled 사용시 오류
MainActivity.java 파일 :
package com.example.locationgooglemapsv2;
import java.io.IOException;
import java.util.List;
import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MainActivity extends FragmentActivity implements LocationListener {
GoogleMap googleMap;
MarkerOptions markerOptions;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting reference to the SupportMapFragment of activity_main.xml
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
// Getting GoogleMap object from the fragment
googleMap = fm.getMap();
// Enabling MyLocation Layer of Google Map
googleMap.setMyLocationEnabled(true);
/*======== MAP TYPE ==========*/
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
RadioGroup rgViews = (RadioGroup) findViewById(R.id.rg_views);
rgViews.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
switch(checkedId){
case R.id.normal: googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
break;
case R.id.satellite:googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
break;
case R.id.terrain: googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
break;
}
}
});
/*======== MARKER AND ONCLICK ==========*/
googleMap.setOnMapClickListener(new OnMapClickListener() {
@Override
public void onMapClick(LatLng latlng) {
// Creating a marker
MarkerOptions markerOption = new MarkerOptions();
// Setting the position for the marker
markerOption.position(latlng);
// Setting the title for the marker.
// This will be displayed on taping the marker
//markerOption.title(latlng.latitude + " : " + latlng.longitude);
// Clears the previously touched position
googleMap.clear();
// Animating to the touched position
googleMap.animateCamera(CameraUpdateFactory.newLatLng(latlng));
// Placing a marker on the touched position
googleMap.addMarker(markerOption);
// Adding Marker on the touched location with address
new ReverseGeocodingTask(getBaseContext()).execute(latlng);
}
});
/*======== LOCATION ==========*/
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
double lat = location.getLatitude();
double lng = location.getLongitude();
//--maps
LatLng latlng = new LatLng(lat, lng);
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latlng));
googleMap.animateCamera(CameraUpdateFactory.zoomTo(10));
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
/*======== REVERSE GEO CODING ==========*/
class ReverseGeocodingTask extends AsyncTask<LatLng, Void, String>{
Context mContext;
public ReverseGeocodingTask(Context con) {
super();
this.mContext = con;
}
@Override
protected String doInBackground(LatLng... params) {
// TODO Auto-generated method stub
Geocoder geocoder = new Geocoder(mContext);
double lat = params[0].latitude;
double lng = params[0].longitude;
List<Address> addresses = null;
String actualAdress = "";
try {
addresses = geocoder.getFromLocation(lat, lng, 1);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(addresses != null && addresses.size() > 0){
Address address = addresses.get(0);
actualAdress = String.format("%s, %s, %s", address.getMaxAddressLineIndex() > 0 ? address.getAddressLine(0) : "",
address.getLocality(), address.getCountryName());
}
return actualAdress;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
// Setting the title for the marker.
// This will be displayed on taping the marker
markerOptions.title(result);
// Placing a marker on the touched position
googleMap.addMarker(markerOptions);
}
}
}
매니페스트 파일 :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.locationgooglemapsv2"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<permission
android:name="com.example.locationgooglemapsv2.permission.MAPS_RECIEVE"
android:protectionLevel="signature" >
</permission>
<uses-permission android:name="com.example.locationgooglemapsv2.permission.MAPS_RECIEVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.locationgooglemapsv2.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="API_KEY" />
</application>
</manifest>
오류 로그 : BTW
01-11 21:11:56.282: E/AndroidRuntime(327): FATAL EXCEPTION: main
01-11 21:11:56.282: E/AndroidRuntime(327): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.locationgooglemapsv2/com.example.locationgooglemapsv2.MainActivity}: java.lang.NullPointerException
01-11 21:11:56.282: E/AndroidRuntime(327): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
01-11 21:11:56.282: E/AndroidRuntime(327): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
01-11 21:11:56.282: E/AndroidRuntime(327): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
01-11 21:11:56.282: E/AndroidRuntime(327): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
01-11 21:11:56.282: E/AndroidRuntime(327): at android.os.Handler.dispatchMessage(Handler.java:99)
01-11 21:11:56.282: E/AndroidRuntime(327): at android.os.Looper.loop(Looper.java:123)
01-11 21:11:56.282: E/AndroidRuntime(327): at android.app.ActivityThread.main(ActivityThread.java:4627)
01-11 21:11:56.282: E/AndroidRuntime(327): at java.lang.reflect.Method.invokeNative(Native Method)
01-11 21:11:56.282: E/AndroidRuntime(327): at java.lang.reflect.Method.invoke(Method.java:521)
01-11 21:11:56.282: E/AndroidRuntime(327): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-11 21:11:56.282: E/AndroidRuntime(327): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-11 21:11:56.282: E/AndroidRuntime(327): at dalvik.system.NativeStart.main(Native Method)
01-11 21:11:56.282: E/AndroidRuntime(327): Caused by: java.lang.NullPointerException
01-11 21:11:56.282: E/AndroidRuntime(327): at com.example.locationgooglemapsv2.MainActivity.onCreate(MainActivity.java:46)
01-11 21:11:56.282: E/AndroidRuntime(327): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-11 21:11:56.282: E/AndroidRuntime(327): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
01-11 21:11:56.282: E/AndroidRuntime(327): ... 11 more
t 그는 출처가 google map v2으로 게임을 즐기려는 사람들에게 좋은 예이며 잘 언급되어 있습니다.
오류에 대한 도움을 주시면 감사하겠습니다.
미리 감사드립니다.
귀하의 "API_KEY"를 사용하여 다운로드하는 사용자에게 메시지를 표시 할 수 있습니다. "API_KEY"를 (를) 삽입하십시오. – BBonDoo
@BBonDoo 실제 프로그램에 API 키를 삽입했습니다. – YKM
@ YKM..OK에 API_KEY이 있습니다. 이제 매니페스트의 빌드 대상이 "입니다."android : minSdkVersion = "7"로 설정을 변경하고 프로젝트를 다시 실행하십시오. (API 8), 안드로이드 2.2에 리버스 지오 코딩 버그가있는 것으로 알려져 있기 때문에 실패한 결과를 얻을 가능성이 있습니다. 동일한 실패 결과가 발생하면 다시 실행하고 다시 실행하십시오. 결과를 알려주십시오. –
BBonDoo