安卓中的java空指针异常错误
我在安卓中运行texter应用程序时遇到以下异常
堆栈跟踪：
java.lang.NullPointerException at com.texter.messenger.SmsReceiverService$ServiceHandler.handleMessage(SmsReceiverService.java:116) at 安卓.os.Handler.dispatchMessage(Handler.java:99) at 安卓.os.Looper.loop(Looper.java:123) at 安卓.os.HandlerThread.run(HandlerThread.java:60) , PHONE_MODEL : GT-I9000 , ANDROID_VERSION : 2.2 , APP_VERSION_CODE : 10 30.Nov.2011 00:33:50 AM , CUSTOM_DATA : , STACK_TRACE : java.lang.IllegalArgumentException: Receiver not registered: 安卓.widget.ViewFlipper$1@40597cc0 at 安卓.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:634) at 安卓.app.ContextImpl.unregisterReceiver(ContextImpl.java:881) at 安卓.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:331) at 安卓.widget.ViewFlipper.onDetachedFromWindow(ViewFlipper.java:104) at 安卓.view.View.dispatchDetachedFromWindow(View.java:6235) at 安卓.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1250) at 安卓.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1248) at 安卓.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1248) at 安卓.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1248) at 安卓.view.ViewRoot.dispatchDetachedFromWindow(ViewRoot.java:1838) at 安卓.view.ViewRoot.doDie(ViewRoot.java:2916) at 安卓.view.ViewRoot.die(ViewRoot.java:2886) at 安卓.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:254) at 安卓.view.Window$LocalWindowManager.removeViewImmediate(Window.java:445) at 安卓.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3182) at 安卓.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3287) at 安卓.app.ActivityThread.access$1600(ActivityThread.java:132) at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:1042) at 安卓.os.Handler.dispatchMessage(Handler.java:99) at 安卓.os.Looper.loop(Looper.java:150) at 安卓.app.ActivityThread.main(ActivityThread.java:4293) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:597) at dalvik.system.NativeStart.main(Native Method).
我对这些错误一无所知。如何解决这些错误
package com.texter.messenger;
import java.util.List;
import 安卓.app.Activity;
import 安卓.app.PendingIntent;
import 安卓.app.PendingIntent.CanceledException;
import 安卓.app.Service;
import 安卓.content.Context;
import 安卓.content.Intent;
import 安卓.content.pm.PackageManager;
import 安卓.content.pm.ResolveInfo;
import 安卓.net.Uri;
import 安卓.os.Bundle;
import 安卓.os.Handler;
import 安卓.os.HandlerThread;
import 安卓.os.IBinder;
import 安卓.os.Looper;
import 安卓.os.Message;
import 安卓.os.PowerManager;
import 安卓.os.Process;
import 安卓.telephony.SmsManager;
import 安卓.telephony.SmsMessage;
import 安卓.telephony.SmsMessage.MessageClass;
import 安卓.telephony.TelephonyManager;
import 安卓.util.Log;
import com.texter.common.TexterConstants;
import com.texter.common.TexterNotification;
import com.texter.common.Utils;
import com.texter.data.TexterDB;
import com.texter.data.TexterDB.Schedule;
import com.texter.preferences.TexterPreferenceManager;
import com.texterpro.app.ConversationList;
import com.texterpro.app.R;
import com.texterpro.app.SmsPopupView;
public class SmsReceiverService extends Service {
private static final String LOG_TAG = TexterConstants.COMMON_TAG;
private static final String ACTION_SMS_RECEIVED = "安卓.provider.Telephony.SMS_RECEIVED";
private static final String ACTION_MMS_RECEIVED = "安卓.provider.Telephony.WAP_PUSH_RECEIVED";
private static final String ACTION_MESSAGE_RECEIVED = "net.everything安卓.smspopup.MESSAGE_RECEIVED";
private static final String MMS_DATA_TYPE = "application/vnd.wap.mms-message";
// https://安卓.googlesource.com/platform/packages/apps/Mms/+/master/src/com/安卓/mms/transaction/SmsReceiverService.java
public static final String MESSAGE_SENT_ACTION = "com.安卓.mms.transaction.MESSAGE_SENT";
/*
* This is the number of retries and pause between retries that we will keep
* checking the system message database for the latest incoming message
*/
private static final int MESSAGE_RETRY = 8;
private static final int MESSAGE_RETRY_PAUSE = 1000;
private Context context;
private ServiceHandler mServiceHandler;
private Looper mServiceLooper;
private int mResultCode;
private static final Object mStartingServiceSync = new Object();
private static PowerManager.WakeLock mStartingService;
private static final int TOAST_HANDLER_MESSAGE_SENT = 0;
private static final int TOAST_HANDLER_MESSAGE_SEND_LATER = 1;
private static final int TOAST_HANDLER_MESSAGE_FAILED = 2;
@Override
public void onCreate() {
HandlerThread thread = new HandlerThread("Log.LOGTAG",
Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
context = getApplicationContext();
mServiceLooper = thread.getLooper();
mServiceHandler = new ServiceHandler(mServiceLooper);
Log.v(LOG_TAG, "Oncreate");
}
@Override
public void onStart(Intent intent, int startId) {
Log.v(LOG_TAG, "OnStart");
mResultCode = intent != null ? intent.getIntExtra("result", 0) : 0;
Message msg = mServiceHandler.obtainMessage();
msg.arg1 = startId;
msg.obj = intent;
mServiceHandler.sendMessage(msg);
}
@Override
public void onDestroy() {
mServiceLooper.quit();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
private final class ServiceHandler extends Handler {
public ServiceHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
Log.v(LOG_TAG, "handlemessage:");
Log.v(LOG_TAG, msg.toString());
int serviceId = msg.arg1;
Intent intent = (Intent) msg.obj;
String action = intent.getAction();
String dataType = intent.getType();
if (ACTION_SMS_RECEIVED.equals(action)) {
handleSmsReceived(intent);
} else if (ACTION_MMS_RECEIVED.equals(action)
&& MMS_DATA_TYPE.equals(dataType)) {
handleMmsReceived(intent);
} else if (MESSAGE_SENT_ACTION.equals(action)) {
handleSmsSent(intent);
} else if (ACTION_MESSAGE_RECEIVED.equals(action)) {
handleMessageReceived(intent);
}
// NOTE: We MUST not call stopSelf() directly, since we need to
// make sure the wake lock acquired by AlertReceiver is released.
finishStartingService(SmsReceiverService.this, serviceId);
}
}
/**
* Handle receiving a SMS message
*/
private void handleSmsReceived(Intent intent) {
Bundle bundle = intent.getExtras();
if (bundle != null) {
SmsMessage[] messages = Utils.getMessagesFromIntent(intent);
if (messages != null) {
notifyMessageReceived(new SmsMmsMessage(context, messages,
System.currentTimeMillis()));
}
}
}
private void notifyMessageReceived(SmsMmsMessage message) {
// Class 0 SMS, let the system handle this
if (message.getMessageType() == SmsMmsMessage.MESSAGE_TYPE_SMS
&& message.getMessageClass() == MessageClass.CLASS_0) {
return;
}
TelephonyManager mTM = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
boolean callStateIdle = mTM.getCallState() == TelephonyManager.CALL_STATE_IDLE;
/*
* If popup is enabled for this user -AND- the user is not in a call
* -AND- -AND- phone is not docked -AND- (screen is locked -OR- (setting
* is OFF to only show on keyguard -AND- user is not in messaging app:
* then show the popup activity, otherwise check if notifications are on
* and just use the standard notification))
*/
boolean isApp = TexterPreferenceManager.getInstance(this)
.isAppEnabled();
boolean showPop = TexterPreferenceManager.getInstance(this)
.isPopupEnabled();
boolean showNotify = TexterPreferenceManager.getInstance(this)
.isNotifyEnabled();
// Log.v(LOG_TAG," App = "+ isApp );
// Log.v(LOG_TAG," pop = "+showPop );
// Log.v(LOG_TAG," notify = "+showNotify );
// if conversationList is visible then do not show pop
if (!ConversationList.isVisible()) {
if (isApp && callStateIdle && showPop) {
// Log.v(LOG_TAG," showing popup = " );
if (!SmsPopupView.isPopupVisible())
context.startActivity(message.getPopupIntent());
}
}
if (isApp && showNotify) {
TexterNotification.ShowMessageNotification(this, message);
}
}
/**
* Handle receiving a MMS message
*/
private void handleMmsReceived(Intent intent) {
}
/**
* Handle receiving an arbitrary message (potentially coming from a 3rd
* party app)
*/
private void handleMessageReceived(Intent intent) {
Bundle bundle = intent.getExtras();
if (bundle != null) {
}
}
/*
* Handler to deal with showing Toast messages for message sent status
*/
public Handler mToastHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg != null) {
switch (msg.what) {
case TOAST_HANDLER_MESSAGE_SENT:
// TexterNotification.showToast(SmsReceiverService.this,R.string.quickreply_sent_toast);
break;
case TOAST_HANDLER_MESSAGE_SEND_LATER:
TexterNotification.showToast(SmsReceiverService.this,
R.string.quickreply_failed_send_later);
break;
case TOAST_HANDLER_MESSAGE_FAILED:
TexterNotification.showToast(SmsReceiverService.this,
R.string.quickreply_failed);
break;
}
}
}
};
/*
* Handle the result of a sms being sent
*/
private void handleSmsSent(Intent intent) {
Log.v(LOG_TAG, "HandleSMSSent called");
PackageManager pm = getPackageManager();
Intent sysIntent = null;
Intent tempIntent;
List<ResolveInfo> receiverList;
boolean forwardToSystemApp = true;
// Search for system messaging app that will receive our
// "message sent complete" type intent
tempIntent = intent.setClassName(
SmsMessageSender.MESSAGING_PACKAGE_NAME,
SmsMessageSender.MESSAGING_RECEIVER_CLASS_NAME);
tempIntent.setAction(SmsReceiverService.MESSAGE_SENT_ACTION);
receiverList = pm.queryBroadcastReceivers(tempIntent, 0);
if (receiverList.size() > 0) {
sysIntent = tempIntent;
}
Bundle b = intent.getExtras();
long rowid = 0;
rowid = b == null ? 0 : b.getLong("ROWID");
/*
* No system messaging app was found to forward this intent to,
* therefore we will need to do the final piece of this ourselves which
* is basically moving the message to the correct folder depending on
* the result.
*/
// TexterNotification.showToast(SmsReceiverService.this,
// "before moving folder");
if (sysIntent == null) {
forwardToSystemApp = false;
Uri uri = intent.getData();
Log.v(LOG_TAG, "id = " + rowid);
if (mResultCode == Activity.RESULT_OK) {
SmsMessageSender.moveMessageToFolder(this, uri,
SmsMessageSender.MESSAGE_TYPE_SENT);
} else if ((mResultCode == SmsManager.RESULT_ERROR_RADIO_OFF)
|| (mResultCode == SmsManager.RESULT_ERROR_NO_SERVICE)) {
SmsMessageSender.moveMessageToFolder(this, uri,
SmsMessageSender.MESSAGE_TYPE_QUEUED);
} else {
SmsMessageSender.moveMessageToFolder(this, uri,
SmsMessageSender.MESSAGE_TYPE_FAILED);
}
}
// Check the result and notify the user using a toast
if (mResultCode == Activity.RESULT_OK) {
mToastHandler.sendEmptyMessage(TOAST_HANDLER_MESSAGE_SENT);
TexterDB.getInstance().updateStatus(rowid,
Schedule.STATUS_SCHEDULED_SENT, 0);
} else if ((mResultCode == SmsManager.RESULT_ERROR_RADIO_OFF)
|| (mResultCode == SmsManager.RESULT_ERROR_NO_SERVICE)) {
TexterDB.getInstance().updateStatus(rowid,
Schedule.STATUS_NOT_SENT, -1);
} else {
mToastHandler.sendEmptyMessage(TOAST_HANDLER_MESSAGE_FAILED);
TexterDB.getInstance().updateStatus(rowid,
Schedule.STATUS_NOT_SENT, mResultCode);
}
if (forwardToSystemApp) {
try {
PendingIntent.getBroadcast(this, 0, sysIntent, 0).send(
mResultCode);
} catch (CanceledException e) {
e.printStackTrace();
}
}
}
/**
* Start the service to process the current event notifications, acquiring
* the wake lock before returning to ensure that the service will run.
*/
public static void beginStartingService(Context context, Intent intent) {
synchronized (mStartingServiceSync) {
if (mStartingService == null) {
PowerManager pm = (PowerManager) context
.getSystemService(Context.POWER_SERVICE);
mStartingService = pm.newWakeLock(
PowerManager.PARTIAL_WAKE_LOCK,
"Texter.SmsReceiverService");
mStartingService.setReferenceCounted(false);
}
mStartingService.acquire();
context.startService(intent);
Log.v(LOG_TAG, "service started");
}
}
/**
* Called back by the service when it has finished processing notifications,
* releasing the wake lock if the service is now stopping.
*/
public static void finishStartingService(Service service, int startId) {
synchronized (mStartingServiceSync) {
if (mStartingService != null) {
if (service.stopSelfResult(startId)) {
mStartingService.release();
}
}
}
}
}
# 1 楼答案
我也有同样的错误，仍然在寻找正确的解决方案，但暂时我只是注释掉
onDetachFromWindow()方法。在我的情况下，这是为了测试的目的，所以评论它没有影响我，但不确定你的情况下，但给它一个尝试# 2 楼答案
一般来说，这个问题/答案介绍了如何阅读这些错误：
What is a stack trace, and how can I use it to debug my application errors?
看看代码，
intent不应该是null，毕竟intent.getAction()执行时没有错误似乎更可能是
ViewFlipper有问题，在嵌套堆栈跟踪中获得一些"Receiver not registered" exception：java.lang.IllegalArgumentException: Receiver not registered: android.widget.ViewFlipper$1@40597cc0也许这个问题可以为你指明正确的方向：
ViewFlipper : Receiver not registered
# 3 楼答案
看看痕迹的顶部。。。看看下面的代码：
看看代码。。。在调用
handleSmsReceived之前，检查变量intent是否不是null