请在我的主要活动中找到代码。
package com.example.android.hereiam;
import android.support.annotation.RequiresApi;
import android.support.v4.app.ActivityCompat;
import android.os.Build;
import android.os.Bundle;
import com.google.android.gms.common.api.GoogleApiClient;
import android.support.v4.content.ContextCompat;
import android.support.v4.app.FragmentActivity;
import com.google.android.gms.gcm.GcmListenerService;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.SupportMapFragment;
import android.content.pm.PackageManager;
import android.location.Location;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
// Since it’s the easiest way of adding a map to your project, I’m going to stick with using
// a MapFragment//
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks {
private GoogleMap mMap;
GoogleApiClient mGoogleApiClient;
Marker mLocationMarker;
Location mLastLocation;
LocationRequest mLocationRequest;
@RequiresApi(api = Build.VERSION_CODES.M)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkLocationPermission();
}
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 1;
@RequiresApi(api = Build.VERSION_CODES.M)
public boolean checkLocationPermission() {
// In Android 6.0 and higher you need to request permissions at runtime, and the user has
// the ability to grant or deny each permission. Users can also revoke a previously-granted
// permission at any time, so your app must always check that it has access to each
// permission, before trying to perform actions that require that permission. Here, we’re using
// ContextCompat.checkSelfPermission to check whether this app currently has the
// ACCESS_COARSE_LOCATION permission
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_COARSE_LOCATION)
// If your app does have access to COARSE_LOCATION, then this method will return
// PackageManager.PERMISSION_GRANTED//
!= PackageManager.PERMISSION_GRANTED) {
// If your app doesn’t have this permission, then you’ll need to request it by calling
// the ActivityCompat.requestPermissions method//
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
android.Manifest.permission.ACCESS_COARSE_LOCATION))
requestPermissions(new String[]{
android.Manifest.permission.ACCESS_COARSE_LOCATION
},
MY_PERMISSIONS_REQUEST_LOCATION);
else {
// Request the permission by launching Android’s standard permissions dialog.
// If you want to provide any additional information, such as why your app requires this
// particular permission, then you’ll need to add this information before calling
// requestPermission //
requestPermissions(new String[]{
android.Manifest.permission.ACCESS_COARSE_LOCATION
},
MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Specify what kind of map you want to display. In this example I’m sticking with the
// classic, “Normal” map
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) ;
{
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_COARSE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
// Although the user’s location will update automatically on a regular basis, you can also
// give your users a way of triggering a location update manually. Here, we’re adding a
// ‘My Location’ button to the upper-right corner of our app; when the user taps this button,
// the camera will update and center on the user’s current location//
mMap.setMyLocationEnabled(true);
} else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
}
protected synchronized void buildGoogleApiClient() {
// Use the GoogleApiClient.Builder class to create an instance of the
// Google Play Services API client//
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addApi(LocationServices.API)
.build();
// Connect to Google Play Services, by calling the connect() method//
mGoogleApiClient.connect();
}
@Override
// If the connect request is completed successfully, the onConnected(Bundle) method
// will be invoked and any queued items will be executed//
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(2000);
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_COARSE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
// Retrieve the user’s last known location//
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (LocationListener) this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
// Displaying multiple ‘current location’ markers is only going to confuse your users!
// To make sure there’s only ever one marker onscreen at a time, I’m using
// mLocationMarker.remove to clear all markers whenever the user’s location changes.
public class MyGcmListenerService extends GcmListenerService {
@Override
public void onMessageReceived(String from, Bundle data) {
String message = data.getString("message");
}
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mLocationMarker != null) {
mLocationMarker.remove();
}
// To help preserve the device’s battery life, you’ll typically want to use
// removeLocationUpdates to suspend location updates when your app is no longer
// visible onscreen//
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, (LocationListener) this);
}
}
// Once the user has granted or denied your permission request, the Activity’s
// onRequestPermissionsResult method will be called, and the system will pass
// the results of the ‘grant permission’ dialog, as an int//
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOC`enter code here`ATION: {
// If the request is cancelled, the result array will be empty (0)//
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// If the user has granted your permission request, then your app can now perform all its
// location-related tasks, including displaying the user’s location on the map//
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_COARSE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
} else {
// If the user has denied your permission request, then at this point you may want to
// disable any functionality that depends on this permission//
}
return;
}
}
}
}
}
主要活动代码处理谷歌api给我正确的位置地方。
但我得到了错误：
处理：com.example.android.hereiam，PID：15899 java.lang.ClassCastException：com.example.android.hereiam.MapsActivity 无法转换为com.google.android.gms.location.LocationListener 在 com.example.android.hereiam.MapsActivity.onConnected（MapsActivity.java:151） 在com.google.android.gms.common.internal.zzk.zzp（未知来源） 在com.google.android.gms.internal.zzrd.zzn（未知来源） 在com.google.android.gms.internal.zzrb.zzass（未知来源） 在com.google.android.gms.internal.zzrb.onConnected（未知来源） 在com.google.android.gms.internal.zzrf.onConnected（未知来源） 在com.google.android.gms.internal.zzqr.onConnected（未知来源） 在com.google.android.gms.common.internal.zzj $ 1.onConnected（未知 资源） 在com.google.android.gms.common.internal.zze $ zzj.zzavj（未知 资源） 在com.google.android.gms.common.internal.zze $ zza.zzc（未知来源） 在com.google.android.gms.common.internal.zze $ zza.zzv（未知来源） 在com.google.android.gms.common.internal.zze $ zze.zzavl（未知 资源） 在 com.google.android.gms.common.internal.zze $ zzd.handleMessage（未知 资源） 在android.os.Handler.dispatchMessage（Handler.java:102） 在android.os.Looper.loop（Looper.java:154） 在android.app.ActivityThread.main（ActivityThread.java:6692） at java.lang.reflect.Method.invoke（Native Method） 在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1468） 在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1358)11-21 14：45：42.935 15899-15944 / com.example.android.hereiam I / System.out： （HTTPLog）-Static：isSBSettingEnabled false 11-21 14：45：42.935 15899-15944 / com.example.android.hereiam I / System.out: （HTTPLog）-Static：isSBSettingEnabled false 11-21 14：45：44.702 15899-15971 / com.example.android.hereiam W / DynamiteModule：本地模块 com.google.android.gms.googlecertificates的描述符类没有 找到。 11-21 14：45：44.706 15899-15971 / com.example.android.hereiam W / DynamiteModule：无法通过V2加载模块： java.lang.ClassNotFoundException：没找到类 ＆＃34; com.google.android.gms.dynamite.DynamiteModule $ DynamiteLoaderClassLoader＆＃34; 在路径上：DexPathList [[zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/base.apk" ;,zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_dependencies_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_0_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_1_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_2_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_3_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_4_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_5_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_6_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_7_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_8_apk.apk" ;, zip文件 ＆＃34; /data/app/com.example.android.hereiam-1/split_lib_slice_9_apk.apk"]，nativeLibraryDirectories = [/数据/应用/ com.example.android.hereiam-1 / LIB / arm64， / system / lib64，/ vendor / lib64]] 11-21 14：45：44.737 15899-15971 / com.example.android.hereiam I / DynamiteModule：考虑 本地模块com.google.android.gms.googlecertificates：0和远程 模块com.google.android.gms.googlecertificates：4 11-21 14：45：44.737 15899-15971 / com.example.android.hereiam I / DynamiteModule：已选中 远程版本的com.google.android.gms.googlecertificates，版本
= 4 11-21 14：45：44.763 15899-15971 / com.example.android.hereiam W / System：ClassLoader引用未知路径： /data/user_de/0/com.google.android.gms/app_chimera/m/00000038/n/arm64-v8a
答案 0 :(得分：3)
您应该实现LocationListener，并且不要尝试将您的活动转换为LocationListener。
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, LocationListener {
实施LocationListener方法
并替换此
(LocationListener) this
到此
this
答案 1 :(得分：0)
您需要在MapsActivity类中实现LocationListener。然后你可以做流量： 替换这一行
<div class="center">
<input type="number" name="height" placeholder="weight">
<span>kg</span>
<input type="number" name="weight" placeholder="height">
<span>cm</span>
</div>用这个：
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (LocationListener) this);
和这一行：
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
用这个：
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, (LocationListener) this);