I get an InstantiationException when I try to start an IntentService. I have looked at other threads here but the answers don't solve my problem. My service class does have a default constructor. Here's my service class. (It is defined in a file FindMeService.java and that's the only class in that file.)
package com.findme.findme;
import android.app.IntentService;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
public class FindMeService extends IntentService {
/*public static class Constants {
}*/
public static final String BROADCAST_ACTION = "com.findme.findme.BROADCAST";
public static final String ACTION_REGISTER_USER = "com.findme.findme.REGISTER_USER";
public static final String KEY_USERID = "user_id";
public static final String KEY_USERPASS = "user_pass";
public static final String RESPONSE_FOR = "response_for";
public static final String RESPONSE_VAL = "response_val";
public FindMeService() {
super("FindMeService");
}
@Override
protected void onHandleIntent(Intent intent) {
// TODO handle intent
if(intent.getAction() == ACTION_REGISTER_USER) {
CommunicationsManager commManager = new CommunicationsManager();
// get extras from the intent
Bundle details = intent.getExtras();
String userId = (String) details.get(KEY_USERID);
String password = (String) details.get(KEY_USERPASS);
// send the register request
String result = commManager.Register(userId, password);
// put the result into an intent and broadcast it
Intent resultIntent = new Intent(BROADCAST_ACTION);
resultIntent.putExtra(RESPONSE_FOR, ACTION_REGISTER_USER)
.putExtra(RESPONSE_VAL, result);
LocalBroadcastManager.getInstance(this).sendBroadcast(resultIntent);
}
}
}
I am starting the service by making a call to startService() from inside an activity. The logs read as follows:
E/AndroidRuntime( 1048): java.lang.RuntimeException: Unable to instantiate service
com.findme.findme.FindMeService: java.lang.InstantiationException: can't instantiate
class com.findme.findme.FindMeService; no empty constructor
Here's how I am starting the service
...
Intent registerUserIntent = new Intent(this, FindMeService.class);
registerUserIntent
.setAction(FindMeService.ACTION_REGISTER_USER);
registerUserIntent.putExtra(FindMeService.KEY_USERID,
phoneNumber).putExtra(FindMeService.KEY_USERPASS,
password);
// start the service
startService(registerUserIntent);
...
Here's a relevant part of the manifest file
....
<service
android:name=".FindMeService"
android:exported="false"
android:enabled="true"/>
...
The problem was finally solved and it turns out that it was due to some bug in either the emulator or in Eclipse. The problem was solved after I restarted Eclipse and unchecked the "Launch form snapshot" option and checked the "Wipe user data" option before launching the emulator. Thanks every one for looking into this question. I too was totally baffled about the entire matter.
来源:https://stackoverflow.com/questions/21168579/android-instantiationexception-no-empty-constructor