我正在尝试在后台解压缩某些文件，因此我像在Google教程中一样使用IntentService。我在AndroidManifest中声明的服务类如下：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.osmdroid">

<uses-sdk
    android:minSdkVersion="16"
    android:targetSdkVersion="21" />


<application
    android:configChanges="orientation|screenSize|keyboardHidden"
    android:hardwareAccelerated="true"
    android:icon="@drawable/ecn_icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >


    <activity
        android:name=".MapActivity"
        android:icon="@drawable/ecn_icon"
        android:label="test" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <activity
        android:name=".SettingsActivity"
        android:label="@string/title_activity_settings">
    </activity>
    <service
        android:name=".UnZipService"
        android:exported="false"/>
</application>

在活动中，我有

IntentFilter intentFilter = new IntentFilter(DownloadManager
            .ACTION_DOWNLOAD_COMPLETE);

    receiverDownloadComplete = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            long reference = intent.getLongExtra(DownloadManager
                    .EXTRA_DOWNLOAD_ID, -1);
            if (myDownloadReference == reference) {

                     ...
                switch (status) {
                    case DownloadManager.STATUS_SUCCESSFUL:

                        Intent mServiceIntent = new Intent(context, UnZipService.class);
                        mServiceIntent.setData(Uri.parse(savedFilePath));
                        startActivity(mServiceIntent);

                        break;
                    ...
                }
                cursor.close();
            }
        }
    };
    registerReceiver(receiverDownloadComplete, intentFilter);

和服务在这里：

public class UnZipService extends IntentService {
public UnZipService() {
    super("UnZipService");
}

@Override
protected void onHandleIntent(Intent workIntent) {
    String dataString = workIntent.getDataString();
    Log.v("IntentURI", dataString);
    Toast.makeText(this, "Installing....", Toast.LENGTH_SHORT).show();
}

它应该显示吐司只是为了测试，但我总是收到一个错误：

    01-29 19:08:25.740  15521-15521/org.osmdroid E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Error receiving broadcast Intent { act=android.intent.action.DOWNLOAD_COMPLETE flg=0x10 pkg=org.osmdroid (has extras) } in org.osmdroid.SettingsActivity$1@21292650
            at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:768)
            at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:150)
            at android.app.ActivityThread.main(ActivityThread.java:5147)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {org.osmdroid/org.osmdroid.UnZipService}; have you declared this activity in your AndroidManifest.xml?
            at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1618)
            at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
            at android.app.Activity.startActivityForResult(Activity.java:3404)
            at android.app.Activity.startActivityForResult(Activity.java:3365)
            at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:817)
            at android.app.Activity.startActivity(Activity.java:3600)
            at android.app.Activity.startActivity(Activity.java:3568)
            at org.osmdroid.SettingsActivity$1.onReceive(SettingsActivity.java:148)
            at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:758)
at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:150)
            at android.app.ActivityThread.main(ActivityThread.java:5147)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)

两者（类和活动）都位于同一文件夹（org.osmdroid）中。似乎可以使用路径，但是问题出现了，我没有更多的想法了……