Fix a crash for CursorIndexOutOfBoundsException #10
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Add a guard for the case that the cursor's length of the database is zero.
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Problem
cursor.getStringcan make theCursorIndexOutOfBoundsExceptionwhen the cursor's length of the database is zero.Situation
The situation can happen when the
READ_EXTERNAL_STORAGEpermission is not allowed by the OS ( >= Android 12)Solution
Add a guard for the case that the cursor's length of the database is zero.