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こんにちは、Androidには初めてです。誰かが私を助けてくれるのだろうかと思っています。私はそれにナビゲートするときにクラッシュするMapsActivityを持っています。私はエラーを見ているところから正確にどこに絞り込んだのだろうと思っていますが、何を変えるべきかを理解することはできません。 下記のMapsActivityクラス全体を追加しました。問題は、この行のonConnectedメソッドで発生していますmLocationManager.requestLocationUpdates(provider, 5000, 0, this); 。 Android StudioではLocationListenerに 'this'をキャストすることをお勧めしますが、これはうまくいかず、私が取得したエラーはMapsActivityコードの下に表示されます。 私はまた、 'this'の代わりにmLocationListenerを入力しようとしましたが、うまくいきません。MapsActivityが負荷でクラッシュする
どのようなヘルプも優遇されます。ありがとう！
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener {
private static final int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;
private static final int MY_PERMISSIONS_REQUEST_ACCESS_COARSE_LOCATION = 2;
private GoogleMap mMap;
private GoogleApiClient mGoogleApiClient;
private LocationManager mLocationManager;
private Location mLastLocation;
private LocationListener mLocationListener;
private String mLatitude;
private String mLongitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_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);
// Create an instance of GoogleAPIClient.
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
//create instance of location manager and get location service
mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
}
/**
* 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;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
@Override
protected void onStart() {
mGoogleApiClient.connect();
super.onStart();
}
@Override
protected void onStop() {
mGoogleApiClient.disconnect();
//mLocationManager.removeUpdates((LocationManager) this);
super.onStop();
}
@Override
public void onConnected(@Nullable Bundle bundle) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(true);
criteria.setBearingRequired(true);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = mLocationManager.getBestProvider(criteria, true);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mLocationManager.requestLocationUpdates(provider, 5000, 0, this);
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if(mLastLocation != null){
mLatitude = String.valueOf(mLastLocation.getLatitude());
mLongitude = String.valueOf(mLastLocation.getLongitude());
Toast.makeText(this, mLatitude + " , " + mLongitude, Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(this, "Permission denied, please accept permission..", Toast.LENGTH_SHORT).show();
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults){
switch (requestCode){
case MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION:{
//if request cancelled the results array is empty
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
//do task you wish to do
//Intent intent = (new Intent(this, MapsActivity.class));
//startActivity(intent);
}else{
//permission denied, disable functionality(GPS)
}
return;
}
//other cases go here
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
}
}
鋳造エラー -
mLocationListenerのエラーで 'これを交換'E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.a8460p.locationotes, PID: 23305
java.lang.ClassCastException: com.example.a8460p.locationotes.MapsActivity cannot be cast to android.location.LocationListener
at com.example.a8460p.locationotes.MapsActivity.onConnected(MapsActivity.java:106)
at com.google.android.gms.common.internal.zzm.zzq(Unknown Source)
at com.google.android.gms.internal.zzaal.zzo(Unknown Source)
at com.google.android.gms.internal.zzaaj.zzvE(Unknown Source)
at com.google.android.gms.internal.zzaaj.onConnected(Unknown Source)
at com.google.android.gms.internal.zzaan.onConnected(Unknown Source)
at com.google.android.gms.internal.zzzy.onConnected(Unknown Source)
at com.google.android.gms.common.internal.zzl$1.onConnected(Unknown Source)
at com.google.android.gms.common.internal.zzf$zzj.zzwZ(Unknown Source)
at com.google.android.gms.common.internal.zzf$zza.zzc(Unknown Source)
at com.google.android.gms.common.internal.zzf$zza.zzu(Unknown Source)
at com.google.android.gms.common.internal.zzf$zze.zzxa(Unknown Source)
at com.google.android.gms.common.internal.zzf$zzd.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:234)
at android.app.ActivityThread.main(ActivityThread.java:5526)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
-
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.a8460p.locationotes, PID: 24073
java.lang.IllegalArgumentException: invalid listener: null
at android.location.LocationManager.checkListener(LocationManager.java:1733)
at android.location.LocationManager.requestLocationUpdates(LocationManager.java:461)
at com.example.a8460p.locationotes.MapsActivity.onConnected(MapsActivity.java:106)
at com.google.android.gms.common.internal.zzm.zzq(Unknown Source)
at com.google.android.gms.internal.zzaal.zzo(Unknown Source)
at com.google.android.gms.internal.zzaaj.zzvE(Unknown Source)
at com.google.android.gms.internal.zzaaj.onConnected(Unknown Source)
at com.google.android.gms.internal.zzaan.onConnected(Unknown Source)
at com.google.android.gms.internal.zzzy.onConnected(Unknown Source)
at com.google.android.gms.common.internal.zzl$1.onConnected(Unknown Source)
at com.google.android.gms.common.internal.zzf$zzj.zzwZ(Unknown Source)
at com.google.android.gms.common.internal.zzf$zza.zzc(Unknown Source)
at com.google.android.gms.common.internal.zzf$zza.zzu(Unknown Source)
at com.google.android.gms.common.internal.zzf$zze.zzxa(Unknown Source)
at com.google.android.gms.common.internal.zzf$zzd.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:234)
at android.app.ActivityThread.main(ActivityThread.java:5526)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
ご協力ありがとうございます。 – Gus
ハッピーコーディング（Y） –