利用关键字synchronized给部分代码上锁，一次只允许一个线程访问解决GTaskSyncService.java中如果存在多个类实例和/或多个线程，则很容易导致错误的问题。

Signed-off-by: qianji <1535486312@qq.com>

Notes-master1/app/src/main/java/net/micode/notes/gtask/remote/GTaskSyncService.java

@@ -42,7 +42,7 @@ public class GTaskSyncService extends Service {
 
     private static String mSyncProgress = "";
 
-    private void startSync() {
+    private synchronized void startSync() {
         if (mSyncTask == null) {
             mSyncTask = new GTaskASyncTask(this, new GTaskASyncTask.OnCompleteListener() {
                 public void onComplete() {
@@ -63,7 +63,7 @@ public class GTaskSyncService extends Service {
     }
 
     @Override
-    public void onCreate() {
+    public synchronized void onCreate() {
         mSyncTask = null;
     }
 
@@ -97,7 +97,7 @@ public class GTaskSyncService extends Service {
         return null;
     }
 
-    public void sendBroadcast(String msg) {
+    public synchronized void sendBroadcast(String msg) {
         mSyncProgress = msg;
         Intent intent = new Intent(GTASK_SERVICE_BROADCAST_NAME);
         intent.putExtra(GTASK_SERVICE_BROADCAST_IS_SYNCING, mSyncTask != null);

Notes-master1/app/src/main/java/net/micode/notes/tool/DataUtils.java

@@ -229,7 +229,7 @@ public class DataUtils {
     public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) {
         Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
                 new String [] { CallNote.PHONE_NUMBER },
-                CallNote.NOTE_ID + AND + CallNote.MIME_TYPE + "=?",
+                Notes.DataColumns.NOTE_ID + AND + Notes.DataColumns.MIME_TYPE + "=?",
                 new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE },
                 null);
 
@@ -247,8 +247,8 @@ public class DataUtils {
 
     public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) {
         Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
-                new String [] { CallNote.NOTE_ID },
-                CallNote.CALL_DATE + AND + CallNote.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
+                new String [] { Notes.DataColumns.NOTE_ID },
+                CallNote.CALL_DATE + AND + Notes.DataColumns.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
                 + CallNote.PHONE_NUMBER + ",?)",
                 new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
                 null);