我有一个活动中的IntentService,当我尝试调用服务时,它抛出这个错误,我觉得奇怪,因为我有没有空的构造函数声明。
错误:
06-17 15:48:34.603:E / AndroidRuntime(13363):致命异常:主要
06-17 15:48:34.603:E / AndroidRuntime(13363):java.lang.RuntimeException的:无法实例化服务cl.prosys.rac.activity.HomeActivity $ UploadService:java.lang.InstantiationException:不能实例化类CL .prosys.rac.activity.HomeActivity $ UploadService;没有空的构造
06-17 15:48:34.603:E / AndroidRuntime(13363):在android.app.ActivityThread.handleCreateService(ActivityThread.java:2380)
06-17 15:48:34.603:E / AndroidRuntime(13363):在android.app.ActivityThread.access $ 1700(ActivityThread.java:134)
06-17 15:48:34.603:E / AndroidRuntime(13363):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1306)
06-17 15:48:34.603:E / AndroidRuntime(13363):在android.os.Handler.dispatchMessage(Handler.java:99)
06-17 15:48:34.603:E / AndroidRuntime(13363):在android.os.Looper.loop(Looper.java:137)
06-17 15:48:34.603:E / AndroidRuntime(13363):在android.app.ActivityThread.main(ActivityThread.java:4867)
06-17 15:48:34.603:E / AndroidRuntime(13363):在java.lang.reflect.Method.invokeNative(本机方法)
06-17 15:48:34.603:E / AndroidRuntime(13363):在java.lang.reflect.Method.invoke(Method.java:511)
06-17 15:48:34.603:E / AndroidRuntime(13363):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1007)
06-17 15:48:34.603:E / AndroidRuntime(13363):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
06-17 15:48:34.603:E / AndroidRuntime(13363):在dalvik.system.NativeStart.main(本机方法)
06-17 15:48:34.603:E / AndroidRuntime(13363):java.lang.InstantiationException:产生的原因无法实例类cl.prosys.rac.activity.HomeActivity $ UploadService;没有空的构造
06-17 15:48:34.603:E / AndroidRuntime(13363):在java.lang.Class.newInstanceImpl(本机方法)
06-17 15:48:34.603:E / AndroidRuntime(13363):在java.lang.Class.newInstance(Class.java:1319)
06-17 15:48:34.603:E / AndroidRuntime(13363):在android.app.ActivityThread.handleCreateService(ActivityThread.java:2377)
06-17 15:48:34.603:E / AndroidRuntime(13363):10 ...更多
AndroidManifest.xml中
<应用>
...
<服务机器人:名称=。activity.HomeActivity $ UploadService>< /服务>
< /用途>
活动:
包cl.prosys.rac.activity;
进口的java.io.File;
进口的java.util.ArrayList;
进口的java.util.Map;
进口org.json.JSONArray;
进口org.json.JSONObject;
进口android.app.IntentService;
进口android.content.Intent;
进口android.content.IntentFilter;
进口android.database.Cursor;
进口android.os.Bundle;
进口android.os.Environment;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.AdapterView;
进口android.widget.AdapterView.OnItemClickListener;
进口android.widget.ArrayAdapter;
进口android.widget.ListView;
进口cl.prosys.rac.R;
进口cl.prosys.rac.broadcast.UploadBroadcastReceiver;
进口cl.prosys.rac.config.AppConfig;
进口cl.prosys.rac.config.DataKey;
进口cl.prosys.rac.db.DataBase;
进口cl.prosys.rac.db.DataBaseFactory;
进口cl.prosys.rac.db.DataBasePrm;
进口cl.prosys.rac.holder.HomeItemMenuHolder;
进口cl.prosys.rac.net.Request;
公共类HomeActivity扩展AppActivity {
...
公共无效onListItemClick(INT位置){
意向意图;
开关(位置){
案例3://苏比尔
意图=新的意图(这一点,UploadService.class);
startService(意向);
打破;
}
}
公共类UploadService扩展IntentService {
公共UploadService(){
超级(UploadService);
}
@覆盖
保护无效onHandleIntent(意向意图){
...
}
}
}
解决方案
公共类UploadService扩展IntentService {
您服务
是一个内部类。如果你想保持它里面的活动
,将其更改为静态:
公共静态类UploadService扩展IntentService {
您可能想要了解不同类型的嵌套类。从谷歌第一个链接: http://docs.oracle.com/javase/教程/爪哇/ javaOO / nested.html
I have an IntentService within an Activity, and when I try to call the service, it throws this error, which I find strange because if I have the empty constructor declared.
Error:
06-17 15:48:34.603: E/AndroidRuntime(13363): FATAL EXCEPTION: main
06-17 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 constructor
06-17 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.access$1700(ActivityThread.java:134)
06-17 15:48:34.603: E/AndroidRuntime(13363): at android.app.ActivityThread$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 constructor
06-17 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
<application>
...
<service android:name=".activity.HomeActivity$UploadService"></service>
</application>
Activity:
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) {
...
}
}
}
解决方案
public class UploadService extends IntentService {
Your Service
is an inner class. If you want to keep it inside Activity
, change it to static:
public static class UploadService extends IntentService {
You may want to read about different types of nested classes. First link from google: http://docs.oracle.com/javase/tutorial/java/javaOO/nested.html