asyncTask の前、およびデバイスが nfc タグを検出した後に呼び出される、wifi 接続が利用可能かどうかを確認するための次のコードがあります。
public static boolean connectionAvailable(Context context) {
ConnectivityManager connManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
Log.i("UTILS", connManager.toString());
NetworkInfo mWifi = connManager
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
Log.i("UTILS", mWifi.toString());
return mWifi.isConnected();
}
今、私はこのエラーを受け取ります:
05-26 12:20:14.157: E/InputEventReceiver(19847): Exception dispatching input event.
05-26 12:20:14.157: E/MessageQueue-JNI(19847): Exception in MessageQueue callback: handleReceiveCallback
05-26 12:20:14.167: E/MessageQueue-JNI(19847): java.lang.NullPointerException
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at com.example.Utils.connectionAvailable(Utils.java:14)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at com.example.fragments.CustomerSummary.completeRequest(CustomerSummary.java:124)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at com.example.SignInActivity.onTouch(SignInActivity.java:232)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.View.dispatchTouchEvent(View.java:7701)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.app.Activity.dispatchTouchEvent(Activity.java:2458)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.View.dispatchPointerEvent(View.java:7886)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3954)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3833)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3525)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3582)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5602)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5582)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5553)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5682)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.os.MessageQueue.nativePollOnce(Native Method)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.os.MessageQueue.next(MessageQueue.java:138)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.os.Looper.loop(Looper.java:123)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at android.app.ActivityThread.main(ActivityThread.java:5017)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at java.lang.reflect.Method.invokeNative(Native Method)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at java.lang.reflect.Method.invoke(Method.java:515)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-26 12:20:14.167: E/MessageQueue-JNI(19847): at dalvik.system.NativeStart.main(Native Method)
14 行目は次の行です。
.getSystemService(Context.CONNECTIVITY_SERVICE);w
どうしたの？