我正在使用地理围栏。 我编写了服务类GeofenceTransitionsIntentService,它显示红色标记,并说没有Default构造函数。请帮助我。
它是我的清单文件:
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CAMERA"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<!--optional (needed if default theme has no action bar) -->
<activity android:name=".loginpage"></activity>
<activity android:name=".Userlogin" />
<activity android:name=".Register" />
<activity android:name=".MainActivity">
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="AIzaSyB9DNBzfrYiTcmUThheWGNdAKY3lRU3pi8" />
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".GeofenceTransitionsIntentService"/> // here's the error. it turned up red.
</application>
这是我的java类。它有一个构造函数,但没有默认构造函数,如果我手动放置一个构造函数,则会显示错误。
package com.example.foodtag;
import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.text.TextUtils;
import android.util.Log;
import android.widget.Toast;
import com.google.android.gms.location.Geofence;
import com.google.android.gms.location.GeofencingEvent;
import java.util.ArrayList;
import java.util.List;
public class GeofenceTransitionsIntentService extends IntentService {
GeofencingEvent geofencingEvent;
/**
* Creates an IntentService. Invoked by your subclass's constructor.
*
* @param name Used to name the worker thread, important only for debugging.
*/
public GeofenceTransitionsIntentService(String name) { //here is the constructor but it is not default constructor.
super(name);
}
GeofenceTransitionsIntentService(){ // and if i create constructor without parameters, it is showing an error "There is no default constructor available in 'android.app.IntentService'"
}
@Override
protected void onHandleIntent( Intent intent) {
geofencingEvent = GeofencingEvent.fromIntent(intent);
if(geofencingEvent.hasError()){
Toast.makeText(this, "Event has error", Toast.LENGTH_SHORT).show();
return;
}
int geoFenceTransition = geofencingEvent.getGeofenceTransition();
if (geoFenceTransition == Geofence.GEOFENCE_TRANSITION_ENTER){
List<Geofence> triggeringGeofences = geofencingEvent.getTriggeringGeofences();
// String geofenceTransitionDetails = getGeofenceTransitionDetails(this, geoFenceTransition,triggeringGeofences);
// sendNotofication();
}else {
Toast.makeText(this, "geofence transition invalid", Toast.LENGTH_SHORT).show(); }
}
private String getGeofenceTransitionDetails(
Context context,
int geofenceTransition,
List<Geofence> triggeringGeofences){
// String geofenceTransitionString = getTransitionString(geofenceTransition);//getTransitionString(geoFenceTransition)
ArrayList triggeringgeofencesIdsList = new ArrayList();
for (Geofence geofence : triggeringGeofences){
triggeringgeofencesIdsList.add(geofence.getRequestId());
}
String triggeringgeofencesIdsString = TextUtils.join(",",triggeringgeofencesIdsList);
return triggeringgeofencesIdsString;
}
}
答案 0 :(得分:0)
创建一个默认的构造函数(不带参数),并在super上加上类名。
#pragma omp atomic
{
if(a = getmystring(fp)) fprintf(fpw, "A: %s\n", a);
if(b = getmystring(fp)) fprintf(fpw, "B: %s\n", b);
}