我得到java.lang.ClassCastException: com.example.BellasHBG.LocationService cannot be cast to com.google.android.gms.location.LocationListener但我不知道如何解决。删除关键字abstract并不能解决问题。这对我来说是新的，我不是很了解java，所以任何帮助都很感激。这个错误似乎发生在LocationService的下面一行:LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mlocationRequest, (com.google.android.gms.location.LocationListener) this);
目的是获取位置更新，并在该位置出售该特定烘焙产品时向应用程序用户发送通知。
下面是我的MainActivity, LocationService和AndroidManifest.xml
MainActivity
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.Location;
import android.location.LocationManager;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.view.KeyEvent;
import android.webkit.WebViewClient;
import android.widget.TextView;
import com.google.android.gms.location.LocationRequest;
//import android.support.v7.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private WebView webView = null;
public static boolean orignotifsetting = false;
//PendingIntent pendingIntent;
private Alarm alarm;
MyToolBox mtools = new MyToolBox();
LocationIntentService mLocationIntentService = new LocationIntentService();
public LocationManager mlocManager;
//LocationListener mlocListener = new MyLocationListener();
//LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//public static GoogleApiClient mGoogleApiClient;
private Location mCurrentLocation;
LocationRequest mLocationRequest;
PendingIntent resultPendingIntent;
public Intent resultIntent = new Intent();
LocationServiceImpl mLocationService = new LocationServiceImpl();
public static boolean prevNotificationsSetting;
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.i("myTag", "in onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//set the default values first time run but don't overwrite them if they have been set
// ----------------------------------------------------------------| - true will leave them alone, false will clear them every time
PreferenceManager.setDefaultValues(this, R.xml.pref_notification, true);
this.webView = (WebView) findViewById(R.id.webview);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
//myWebView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
//myWebView.setWebViewClient(new WebViewClient());
WebViewClientImpl webViewClient = new WebViewClientImpl(this);
webView.setWebViewClient(webViewClient);
webView.loadUrl("https://www.bellashbg.com");
mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && this.webView.canGoBack()) {
this.webView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onResume() {
Log.i("myTag", "in onResume");
super.onResume();
Intent msgIntent = new Intent(MainActivity.this, LocationService.class);
if ((mtools.notificationsSetting(this)) & (prevNotificationsSetting == false)) {
prevNotificationsSetting = true;
startService(msgIntent);
}
else {
if ((!mtools.notificationsSetting(this)) & (prevNotificationsSetting == true)) {
// mLocationService.stopLocationUpdates();
prevNotificationsSetting = false;
boolean result = stopService(msgIntent);
if (result){
Log.d("MainActivity", "stopService true");
}
else {
Log.d("MainActivity", "stopService false");
}
//mLocationService.stopLocationUpdates();
//android.os.Process.killProcess(android.os.Process.myPid());
}
}
}
@Override
public void onPause() {
Log.i("myTag", "in onPause");
super.onPause();
}
@Override
public void onStop() {
Log.i("myTag", "in onStop");
super.onStop();
}
public void onDestroy() {
Log.i("myTag", "in onDestroy");
super.onDestroy();
//if (mSensorManager!=null){mSensorManager.unregisterListener(listener);}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
Log.i("myTag", "in onCreateOptionsMenu");
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.settings_menu, menu);
return super.onCreateOptionsMenu(menu); // cmnted 10/25/2015
//super.onCreateOptionsMenu(menu);
//return true;
// return true; stack overflow 6439085 says to return true to pop up menu
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Log.i("myTag", "in onOptionsItemSelected");
//LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); //added 11/12/2015 to remove updates
switch (item.getItemId()) {
case R.id.settings:
Intent settingsintent = new Intent(MainActivity.this, SettingsActivity.class);
MainActivity.this.startActivity(settingsintent);
break;
case R.id.help:
break;
case R.id.about:
break;
}
return true;
}
// Get the notifications status bar setting
public boolean notificationsSettingNotificationBar() {
SharedPreferences SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
boolean notificationsNewMessageNotificationBar = SP.getBoolean("notifications_new_message_notification_bar", true);
return notificationsNewMessageNotificationBar;
}
// Get the notifications ringtone
public String notificationsSettingRingtone() {
SharedPreferences SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String notificationsNewMessageRingtone = SP.getString("notifications_new_message_ringtone", "NULL");
return notificationsNewMessageRingtone;
}
// Get the notifications vibrate setting
public boolean notificationsNewMessageSetting() {
SharedPreferences SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
boolean notificationNewMessageVibrate = SP.getBoolean("notifications_new_message_vibrate", true);
return notificationNewMessageVibrate;
}
private TextView latituteField;
private Context mContext;
}
LocationService
package com.example.BellasHBG;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
import androidx.core.app.NotificationCompat;
import androidx.core.app.TaskStackBuilder;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
//import com.google.android.gms.location.LocationListener;
//import android.support.v7.app.AppCompatActivity;
//import android.support.v4.app.NotificationCompat;
//import android.support.v4.app.TaskStackBuilder;
//import com.google.android.gms.common.ConnectionResult;
//import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
//import com.google.android.gms.location.LocationListener;
//import com.google.android.gms.location.LocationRequest;
//import com.google.android.gms.location.LocationServices;
/**
* Created by craigmartensen on 4/7/16.
*/
public abstract class LocationService extends Service implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
public static final long UPDATE_INTERVAL_IN_MILLISECONDS = 60000 * 1; // 1000 milliseconds in 1 second
public static final long FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS = UPDATE_INTERVAL_IN_MILLISECONDS / 5;
public static final long LOCATION_DISTANCE_IN_METERS = 3;
MyToolBox mtools = new MyToolBox();
public static GoogleApiClient mGoogleApiClient;
//public static GoogleSignInClient mSignInClient;
public static GoogleSignInAccount mSignInClient;
LocationRequest mlocationRequest;
private boolean isRemoving = false;
@Override
public IBinder onBind(Intent intent)
{
return null;
}
@SuppressWarnings("static-access")
@Override
public void onCreate() {
isRemoving = false;
mGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext())
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mGoogleApiClient.connect();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
//alarm.SetAlarm(this);
//return START_STICKY;
super.onStartCommand(intent, flags, startId);
//Toast.makeText(this, "onHandleIntent", Toast.LENGTH_SHORT).show();
//mGoogleApiClient.connect();
Log.d("onStartCommand", "Service Started");
return Service.START_STICKY;
}
@Override
public void onConnected(Bundle connectionHint) {
if (isRemoving) {
stopLocationUpdates();
}
else {
isRemoving = false;
mlocationRequest = new LocationRequest();
mlocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
mlocationRequest.setFastestInterval(FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);
mlocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mlocationRequest.setSmallestDisplacement(LOCATION_DISTANCE_IN_METERS);
Intent locationIntent = new Intent(getApplicationContext(), LocationIntentService.class);
locationIntent.putExtra("ID", "FusedLcation");
PendingIntent locationPendingIntent = PendingIntent.getService(getApplicationContext(), 0, locationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
//LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mlocationRequest, locationPendingIntent);
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mlocationRequest, (com.google.android.gms.location.LocationListener) this);
}
}
public void onLocationChanged(Location loc)
{
Log.d("onLocationChanged", "Entering method");
//Toast.makeText(this, "onLocationChanged", Toast.LENGTH_SHORT).show();
mGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext())
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
//Toast.makeText(getApplicationContext(), "entering onLocationChanged", Toast.LENGTH_SHORT).show();
String myText;
double mlat = loc.getLatitude();
double mlong = loc.getLongitude();
DBHelper myDBHelper = new DBHelper(this);
// use the following line if you just want to know if the location is found ie, sells Bellas
//boolean soldHere = myDBHelper.doesLocationSellBellas("my_table",41.685471,-73.975393);
// the following line retrieves the name of the location that sells bellas, null if it's not found
//String locName = myDBHelper.getLocationName("my_table", 41.685471, -73.975393);
String locName = myDBHelper.getLocationName(DBHelper.LOCATION_TABLE_NAME, mlat, mlong);
// set up for notification in the notification status bar
if (locName != null) {
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Bella's sold here");
// .setStyle(new NotificationCompat.BigTextStyle().bigText("Bella's sold here"));
// .setSubText(todaysjolt);
// .setDefaults(Notification.DEFAULT_SOUND)
//.setContentText("Bella's sold here");
// Gets an instance of the NotificationManager service
NotificationManager mNotifyMgr =
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// Builds the notification and issues it.
mBuilder.setContentText(locName);
mBuilder.setStyle(new NotificationCompat.BigTextStyle().bigText(locName));
// new 10/14/2015 - set up to allow user to go to website from notification
// Creates an explicit intent for an Activity in your app
Intent resultIntent = new Intent(this, MainActivity.class);
// The stack builder object will contain an artificial back stack for the
// started Activity.
// This ensures that navigating backward from the Activity leads out of
// your application to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(MainActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
// end new 10/14/2015
mNotifyMgr.notify(000, mBuilder.build());
Toast.makeText(getApplicationContext(), "You are at " + locName, Toast.LENGTH_SHORT).show();
//LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
}
}
protected void startLocationUpdates() {
if (mtools.notificationsSetting(this)) {
MainActivity.orignotifsetting = true;
//LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
public void stopLocationUpdates() {
if(!mGoogleApiClient.isConnected()){
isRemoving = true; //added
mGoogleApiClient.connect();
}
else {
//if (mGoogleApiClient != null) {
// if (!mGoogleApiClient.isConnected()) {
PendingIntent locationPendingIntent = PendingIntent.getService(this, 0, new Intent(this, LocationIntentService.class), PendingIntent.FLAG_UPDATE_CURRENT);
//LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, locationPendingIntent); //moved below 1/28/2016
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, (com.google.android.gms.location.LocationListener) com.example.BellasHBG.LocationService.this);
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
stopSelf(); // stop the service
}
//}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Toast.makeText(this, "Connection Failed", Toast.LENGTH_SHORT).show();
}
@Override
public void onConnectionSuspended(int i) {
Log.d("LocationUpdateService", "Connection Suspended");
}
@Override
public void onDestroy(){
stopLocationUpdates();
//reportarGPS.interrupt();
//reportarGPS = null;
//LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, (com.google.android.gms.location.LocationListener) this);
//mGoogleApiClient.disconnect();
//mGoogleApiClient = null;
//mHandler.removeCallbacksAndMessages(null);
//Thread.currentThread().interrupt();
super.onDestroy();
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.BellasHBG">
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<uses-sdk android:minSdkVersion="15" android:targetSdkVersion="21"/>
<application
android:allowBackup="true"
android:icon="@drawable/bellas_logo_48x36"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.BellasHBG"
android:usesCleartextTraffic="true">
<activity
android:name="com.example.BellasHBG.SettingsActivity"
android:label="@string/action_settings"/>
<activity
android:name="com.example.BellasHBG.CreateNotificationOnBar"
android:label="create_notification_on_bar"/>
<activity
android:name="com.example.BellasHBG.CustomPreference"
android:label="custom_preference"/>
<activity
android:name=".MainActivity"
android:label="Bella's Home Baked Goods" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="com.example.BellasHBG.Alarm" />
<service android:enabled='true' android:name="com.example.BellasHBG.LocationService" />
</application>
</manifest>
请取消在LocationService上对com.google.android.gms.location.LocationListener的导入注释，然后再试一次