java 无法在 android 中强制转换为 com.google.android.gms.location.LocationListener 异常
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cannot be cast to com.google.android.gms.location.LocationListener exception in android
提问by Ram Koti
i am facing an exception in my application, the exception is related to com.google.android.gms.location.LocationListnerin android, please help me in this regards
我在我的应用程序中遇到异常，该异常与com.google.android.gms.location.LocationListner在 android 中有关，请在这方面帮助我
My MainActivity.javafile:
我的MainActivity.java文件：
package com.ideabiz.fusedlocationprovider;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
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;
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, LocationListener {
TextView txtOutputLat, txtOutputLon;
Location mLastLocation;
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
String lat, lon;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtOutputLat = (TextView) findViewById(R.id.textView);
txtOutputLon = (TextView) findViewById(R.id.textView2);
buildGoogleApiClient();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(100); // Update location every second
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (com.google.android.gms.location.LocationListener) this);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
lat = String.valueOf(mLastLocation.getLatitude());
lon = String.valueOf(mLastLocation.getLongitude());
}
updateUI();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
lat = String.valueOf(location.getLatitude());
lon = String.valueOf(location.getLongitude());
updateUI();
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
buildGoogleApiClient();
}
synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onDestroy() {
super.onDestroy();
mGoogleApiClient.disconnect();
}
void updateUI() {
txtOutputLat.setText(lat);
txtOutputLon.setText(lon);
}
}
My logcat file:
我的 logcat 文件：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.ideabiz.fusedlocationprovider, PID: 18114
java.lang.ClassCastException: com.ideabiz.fusedlocationprovider.MainActivity cannot be cast to com.google.android.gms.location.LocationListener
at com.ideabiz.fusedlocationprovider.MainActivity.onConnected(MainActivity.java:52)
My Manifest.xml file:
我的 Manifest.xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ideabiz.fusedlocationprovider">
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<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.gms.version"
android:value="@integer/google_play_services_version" />
</application>
</manifest>
回答by Amad Yus
If you take a look on the logcat, the error stated that you have imported wrong LocationListener. Check on your imported library at the top part of the class, it supposed to be com.google.android.gms.location.LocationListenernot android.location.LocationListener.
如果您查看 logcat，错误表明您导入了错误的 LocationListener。检查类顶部的导入库，它应该com.google.android.gms.location.LocationListener不是android.location.LocationListener.
