java–intentservice没有空构造函数,但是有一个构造函数

概述我在Activity中有一个IntentService,当我尝试调用该服务时,它会抛出此错误,我发现这很奇怪,因为如果我声明了空构造函数.错误：06-1715:48:34.603:E/AndroidRuntime(13363):FATALEXCEPTION:main06-1715:48:34.603:E/AndroidRuntime(13363):java.lang.RuntimeException:U

我在Activity中有一个IntentService,当我尝试调用该服务时,它会抛出此错误,我发现这很奇怪,因为如果我声明了空构造函数.

错误：

06-17 15:48:34.603: E/AndroIDRuntime(13363): FATAL EXCEPTION: main06-17 15:48:34.603: E/AndroIDRuntime(13363): java.lang.RuntimeException: Unable to instantiate service cl.prosys.rac.activity.HomeActivity$UploadService: java.lang.InstantiationException: can't instantiate class cl.prosys.rac.activity.HomeActivity$UploadService; no empty constructor06-17 15:48:34.603: E/AndroIDRuntime(13363):    at androID.app.ActivityThread.handleCreateService(ActivityThread.java:2380)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at androID.app.ActivityThread.access00(ActivityThread.java:134)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1306)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at androID.os.Handler.dispatchMessage(Handler.java:99)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at androID.os.Looper.loop(Looper.java:137)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at androID.app.ActivityThread.main(ActivityThread.java:4867)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at java.lang.reflect.Method.invokeNative(Native Method)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at java.lang.reflect.Method.invoke(Method.java:511)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:774)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at dalvik.system.NativeStart.main(Native Method)06-17 15:48:34.603: E/AndroIDRuntime(13363): Caused by: java.lang.InstantiationException: can't instantiate class cl.prosys.rac.activity.HomeActivity$UploadService; no empty constructor06-17 15:48:34.603: E/AndroIDRuntime(13363):    at java.lang.class.newInstanceImpl(Native Method)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at java.lang.class.newInstance(Class.java:1319)06-17 15:48:34.603: E/AndroIDRuntime(13363):    at androID.app.ActivityThread.handleCreateService(ActivityThread.java:2377)06-17 15:48:34.603: E/AndroIDRuntime(13363):    ... 10 more

AndroIDManifest.xml中

<application>    ...    <service androID:name=".activity.HomeActivity$UploadService"></service></application>

活动：

package cl.prosys.rac.activity;import java.io.file;import java.util.ArrayList;import java.util.Map;import org.Json.JsONArray;import org.Json.JsONObject;import androID.app.IntentService;import androID.content.Intent;import androID.content.IntentFilter;import androID.database.Cursor;import androID.os.Bundle;import androID.os.Environment;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.AdapterVIEw;import androID.Widget.AdapterVIEw.OnItemClickListener;import androID.Widget.ArrayAdapter;import androID.Widget.ListVIEw;import cl.prosys.rac.R;import cl.prosys.rac.broadcast.UploadbroadcastReceiver;import cl.prosys.rac.config.AppConfig;import cl.prosys.rac.config.DataKey;import cl.prosys.rac.db.DataBase;import cl.prosys.rac.db.DataBaseFactory;import cl.prosys.rac.db.DataBasePrm;import cl.prosys.rac.holder.HomeItemmenuHolder;import cl.prosys.rac.net.Request;public class HomeActivity extends AppActivity {    ...    public voID onListItemClick(int position) {        Intent intent;        switch (position) {        case 3: // Subir             intent = new Intent(this, UploadService.class);            startService(intent);            break;        }    }    public class UploadService extends IntentService {        public UploadService() {            super("UploadService");        }        @OverrIDe        protected voID onHandleIntent(Intent intent) {            ...        }    }}

解决方法:

public class UploadService extends IntentService {

您的服务是一个内部阶级.如果要将其保留在Activity中,请将其更改为static：

public static class UploadService extends IntentService {

您可能想要阅读有关不同类型的嵌套类.来自谷歌的第一个链接：http://docs.oracle.com/javase/tutorial/java/javaOO/nested.html

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