我在Android应用中启动服务时遇到问题。以下代码应该可以正常工作。但通常情况并非总是如此，startService命令的Intent未正确传递给onStartCommand方法。这意味着服务类接收了intent，但是额外内容丢失了：
D/TestService: onStartCommand() called with: intent = [Intent { cmp=***/.services.hostConnection.TestService launchParam=MultiScreenLaunchParams { mDisplayId=0 mFlags=0 } (has extras) }], flags = [0], startId = [6]
D/TestService: onStartCommand: Bundle[mParcelledData.dataSize=0]
此外，我有时会得到RuntimeException: Unable to create service ***.services.hostConnection.TestService（下面的完整堆栈跟踪）
我现在已经连续几天了，但却找不到这个错误...
重现问题的极简主义服务类：
public class TestService extends Service {
private static final String TAG = "TestService";
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d(TAG, "onStartCommand() called with: intent = [" + intent + "], flags = [" + flags + "], startId = [" + startId + "]");
if(intent != null && intent.getExtras() != null) Log.d(TAG, "onStartCommand: " + intent.getExtras().toString());
return START_NOT_STICKY;
}
}
启动服务的方法：
public void startLongUpdates(long hostId){
Log.d(TAG, "startLongUpdates() called");
Intent intent = new Intent(Application.getInstance(), TestService.class).putExtra(Constants.SERVICE_ACTION_INTENT_EXTRA, HostConnectionService.LONG_UPDATE).putExtra(Constants.CONNECTED_HOST_ID_INTENT_EXTRA, hostId);
Log.d(TAG, "startLongUpdates: " + intent.getExtras().toString());
Application.getInstance().startService(intent);
}
堆栈追踪：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: ***, PID: 24974
java.lang.RuntimeException: Unable to create service ***.services.hostConnection.TestService: java.lang.SecurityException: Binder invocation to an incorrect interface
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3532)
at android.app.ActivityThread.-wrap6(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1740)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6688)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
Caused by: java.lang.SecurityException: Binder invocation to an incorrect interface
at android.os.Parcel.readException(Parcel.java:1693)
at android.os.Parcel.readException(Parcel.java:1646)
at android.hardware.display.IDisplayManager$Stub$Proxy.getDisplayInfo(IDisplayManager.java:718)
at android.hardware.display.DisplayManagerGlobal.getDisplayInfo(DisplayManagerGlobal.java:143)
at android.hardware.display.DisplayManagerGlobal.getCompatibleDisplay(DisplayManagerGlobal.java:200)
at android.hardware.display.DisplayManagerGlobal.getRealDisplay(DisplayManagerGlobal.java:214)
at android.app.ContextImpl.createAppContext(ContextImpl.java:2183)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3499)
at android.app.ActivityThread.-wrap6(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1740)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6688)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
有时也会出现此异常：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: ***, PID: 5355
java.lang.RuntimeException: Unable to start service ***.services.hostConnection.TestService@9386a65 with Intent { cmp=***/.services.hostConnection.TestService (has extras) }: java.lang.RuntimeException: Unknown exception code: 2 msg ServiceActionIntentExtra
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3027)
at android.app.ActivityThread.-wrap17(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1442)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.RuntimeException: Unknown exception code: 2 msg ServiceActionIntentExtra
at android.os.Parcel.readException(Parcel.java:1634)
at android.os.Parcel.readException(Parcel.java:1573)
at android.app.ActivityManagerProxy.serviceDoneExecuting(ActivityManagerNative.java:3814)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3019)
at android.app.ActivityThread.-wrap17(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1442)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
清单：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="***">
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:name="***.Application"
android:allowBackup="false"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:launchMode="singleTop"
android:name="***.gui.menu.MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
</activity>
<activity
android:name=".gui.SplashActivity"
android:theme="@style/SplashTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="***.gui.menu.KnownHostInfoActivity"
android:theme="@style/AppTheme.NoActionBar" />
<service android:name="***.services.hostConnection.TestService" />
</application>
Application.java：
public class Application extends android.app.Application{
private static final String TAG = "Application";
private static Application application;
public static Application getInstance(){
return application;
}
public void onCreate() {
super.onCreate();
application = this;
}
}
答案 0 :(得分：1)
我解决了这个问题！它与应用程序另一端使用的包裹有关...实际上，循环中使用的包裹被提前回收并由应用程序的其他部分重用。因此，这导致应用程序的许多部分出现各种问题。
感谢您的帮助！
答案 1 :(得分：0)
您正在Service onStartComamnd方法中收到意图。但是您错误地从意图中获取数据。请在onStartCommand方法中使用下面的行，
String value = intent.getStringExtra(your key); // if you are sending string
并且，我无法理解，为什么要使用字符串追加 intent 对象。
Log.d(TAG, "onStartCommand() called with: intent = [" + intent + "], flags = [" + flags + "], startId = [" + startId + "]");