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我遇到了實現Syncadapter的問題，它有一個虛擬帳戶和一個笨拙的accountauthenticator。「SyncAdapter」執行過程中的異常
我accountauthenticator，CNAuthenticator：
public class CNAuthenticator extends AbstractAccountAuthenticator {
public CNAuthenticator(Context context) {
super(context);
}
@Override
public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) {
return null;
}
@Override
public Bundle addAccount(AccountAuthenticatorResponse response, String accountType, String authTokenType, String[] requiredFeatures, Bundle options) throws NetworkErrorException {
return null;
}
@Override
public Bundle confirmCredentials(AccountAuthenticatorResponse response, Account account, Bundle options) throws NetworkErrorException {
return null;
}
@Override
public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {
return null;
}
@Override
public String getAuthTokenLabel(String authTokenType) {
return null;
}
@Override
public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {
return null;
}
@Override
public Bundle hasFeatures(AccountAuthenticatorResponse response, Account account, String[] features) throws NetworkErrorException {
return null;
}
}
我的認證服務，CNAuthenticatorService：
public class CNAuthenticatorService extends Service {
private CNAuthenticator cnAuthenticator;
public CNAuthenticatorService() {
}
@Override
public void onCreate() {
super.onCreate();
cnAuthenticator= new CNAuthenticator(this);
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
return cnAuthenticator.getIBinder();
}
}
我syncadapter，CNSyncAdapter：
public class CNSyncAdapter extends AbstractThreadedSyncAdapter {
private static final String LOG_TAG = "CNSyncAdapter";
public CNSyncAdapter(Context context, boolean autoInitialize) {
super(context, autoInitialize);
}
@Override
public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
Log.d(LOG_TAG, "onPerformSync Called.");
}
public static Account getSyncAccount(Context context) {
// Get an instance of the Android account manager
AccountManager accountManager =(AccountManager) context.getSystemService(Context.ACCOUNT_SERVICE);
// Create the account type and default account
Account newAccount = new Account(context.getString(R.string.app_name), context.getString(R.string.sync_account_type));
// If the password doesn't exist, the account doesn't exist
if (null == accountManager.getPassword(newAccount)) {
/*
* Add the account and account type, no password or user data
* If successful, return the Account object, otherwise report an error.
*/
if (!accountManager.addAccountExplicitly(newAccount, null, null)) {
return null;
}
/*
* If you don't set android:syncable="true" in
* in your <provider> element in the manifest,
* then call ContentResolver.setIsSyncable(account, AUTHORITY, 1)
* here.
*/
}
return newAccount;
}
public static void syncImmediately(Context context) {
Bundle bundle = new Bundle();
bundle.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, true);
bundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
ContentResolver.requestSync(getSyncAccount(context),
context.getString(R.string.content_authority), bundle);
}
public static void initializeSyncAdapter(Context context) {
getSyncAccount(context);
}
}
我對syncadapter服務，CNSyncService：
public class CNSyncService extends Service {
private static final Object sSyncAdapterLock = new Object();
private static final String LOG_TAG ="CNSyncService" ;
private static CNSyncAdapter cnSyncAdapter = null;
public CNSyncService() {
Log.d(LOG_TAG, "onCreate");
synchronized (sSyncAdapterLock) {
if (cnSyncAdapter==null)
cnSyncAdapter = new CNSyncAdapter(getBaseContext(),true);
}
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
return cnSyncAdapter.getSyncAdapterBinder();
}
}
我收到一個異常，當我在我的一個片段中調用CNSyncAdapter.syncImmediately(getActivity())。
我的logcat，
06-22 19:48:35.080 27790-28417/com.mobileapplicationsclub.cashnote.app W/dalvikvm﹕ threadid=17: thread exiting with uncaught exception (group=0x41e0c2b8)
06-22 19:48:35.120 27790-28417/com.mobileapplicationsclub.cashnote.app E/AndroidRuntime﹕ FATAL EXCEPTION: SyncAdapterThread-1
java.lang.NullPointerException
at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:252)
PLZ help.I不知道是什麼原因造成的。
其奇怪，但當我從getBaseContext()更改爲getApplicationContext()我收到了一個不同的錯誤。
我時做出更改的logcat：
06-22 20:21:00.630 29104-29104/com.mobileapplicationsclub.cashnote.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate service com.mobileapplicationsclub.cashnote.app.CNSyncService: java.lang.NullPointerException
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2406)
at android.app.ActivityThread.access$1700(ActivityThread.java:140)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1319)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:174)
at android.app.ActivityThread.main(ActivityThread.java:4952)
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:1027)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:101)
at com.mobileapplicationsclub.cashnote.app.CNSyncService.<init>(CNSyncService.java:17)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1319)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2403)
CNSyncService.java:17是
非常感謝，它工作！ – Tejas