FATAL EXCEPTION: main
Process: com.example.lenovo.phone, PID: 4885
android.database.StaleDataException: Attempted to access a cursor after it has been closed.
at android.database.BulkCursorToCursorAdaptor.throwIfCursorIsClosed(BulkCursorToCursorAdaptor.java:64)
at android.database.BulkCursorToCursorAdaptor.requery(BulkCursorToCursorAdaptor.java:133)
at android.database.CursorWrapper.requery(CursorWrapper.java:186)
at android.app.Activity.performRestart(Activity.java:5309)
at android.app.ActivityThread.handleSleeping(ActivityThread.java:3514)
at android.app.ActivityThread.access$2900(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1500)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5299)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
at dalvik.system.NativeStart.main(Native Method)
Remove this:
protected SQLiteDatabase database;
and make it local
Basically 2 method are executing concurrently and one method called database.close() and 2nd method is still accessing data so the Exception
use this:
public class db {
DataBaseHelper dbHelper;
Context mContext;
public db(Context context) {
this.mContext = context;
}
public db open() throws SQLException {
dbHelper = new DataBaseHelper(mContext);
return this;
}
public void close() {
dbHelper.close();
}
public void insertdb( int id,String ph_num, String call_type, String calldate, String call_duration, String upload_status) {
SQLiteDatabase database = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(DataBaseHelper.id,id);
values.put(DataBaseHelper.phone_number, ph_num);
values.put(DataBaseHelper.call_type, call_type);
values.put(DataBaseHelper.call_date, calldate);
values.put(DataBaseHelper.call_duration, call_duration);
values.put(DataBaseHelper.upload_status, upload_status);
database.insert(DataBaseHelper.table_name, null, values);
database.close();
// Log.d("Database helper", "values inserted");
}
public ArrayList<HashMap<String, String>> getAllUsers() {
ArrayList<HashMap<String, String>> wordList;
wordList = new ArrayList<HashMap<String, String>>();
String selectQuery = "SELECT * FROM call_logtable";
SQLiteDatabase database = dbHelper.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
HashMap<String, String> map = new HashMap<String, String>();
map.put("id", cursor.getString(0));
map.put("phone_number", cursor.getString(1));
map.put("call_type", cursor.getString(2));
map.put("call_date", cursor.getString(3));
map.put("call_duration", cursor.getString(4));
wordList.add(map);
} while (cursor.moveToNext());
}
cursor.close(); // just added
database.close();
return wordList;
}
/**
* Compose JSON out of SQLite records
* @return
*/
public String composeJSONfromSQLite(){
ArrayList<HashMap<String, String>> wordList;
wordList = new ArrayList<HashMap<String, String>>();
String selectQuery = "SELECT * FROM call_logtable where upload_status = '"+"no"+"'";
SQLiteDatabase database = dbHelper.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
HashMap<String, String> map = new HashMap<String, String>();
map.put("id", cursor.getString(0));
map.put("phone_number", cursor.getString(1));
map.put("call_type", cursor.getString(2));
map.put("call_date", cursor.getString(3));
map.put("call_duration", cursor.getString(4));
wordList.add(map);
} while (cursor.moveToNext());
}
cursor.close(); // just added
database.close();
Gson gson = new GsonBuilder().create();
//Use GSON to serialize Array List to JSON
return gson.toJson(wordList);
}
public int dbSyncCount(){
int count = 0;
String selectQuery = "SELECT * FROM call_logtable where upload_status = '"+"no"+"'";
SQLiteDatabase database = dbHelper.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
count = cursor.getCount();
cursor.close(); // just added
database.close();
return count;
}
public void updateSyncStatus(String id, String status){
SQLiteDatabase database = dbHelper.getWritableDatabase();
String updateQuery = "Update call_logtable set upload_status = '"+ status +"' where id="+"'"+ id +"'";
Log.d("query", updateQuery);
database.execSQL(updateQuery);
database.close();
}
public Cursor getinformation()
{
SQLiteDatabase database = dbHelper.getReadableDatabase();
String[] columns={DataBaseHelper.phone_number,DataBaseHelper.call_type,DataBaseHelper.call_date,DataBaseHelper.call_duration,DataBaseHelper.upload_status};
return database.query(DataBaseHelper.table_name,columns,null,null,null,null,null);
}
public void delete()
{
SQLiteDatabase database = dbHelper.getWritableDatabase();
// String[] columns={DataBaseHelper.phone_number,DataBaseHelper.call_type,DataBaseHelper.call_date,DataBaseHelper.call_duration};
database.delete(DataBaseHelper.table_name, null, null);
}
StringBuffer readSpecificfrom_db(String type)
{
String ph_number=null;
String call_type=null;
String call_date=null;
String call_duration=null;
String upload_status=null;
StringBuffer sb = new StringBuffer();
//sb.append("Call Log :");
Cursor cursor_object=getinformation();
cursor_object.moveToFirst();
do {
if((cursor_object.getString(1)).equals(type)) {
ph_number = cursor_object.getString(0);
call_type = cursor_object.getString(1);
call_date = cursor_object.getString(2);
call_duration = cursor_object.getString(3);
if(type=="Missed") {
sb.append("\nPhone Number:--- " + ph_number +
" \nCall Type:--- " + call_type +
" \nCall Date:--- " + call_date
// + " \nCall duration in sec :--- " + call_duration
);
sb.append("\n----------------------------------");
}
else
{
sb.append("\nPhone Number:--- " + ph_number +
" \nCall Type:--- " + call_type +
" \nCall Date:--- " + call_date
+ " \nCall duration in sec :--- " + call_duration);
sb.append("\n----------------------------------");
}
}
}while(cursor_object.moveToNext());
cursor_object.close(); // just added
return sb;
}
StringBuffer readfrom_db()
{
String ph_number=null;
String call_type=null;
String call_date=null;
String call_duration=null;
String upload_status;
// int id=0;
StringBuffer sb = new StringBuffer();
// sb.append("Call Log :");
Cursor cursor_object=getinformation();
cursor_object.moveToFirst();
do {
ph_number=cursor_object.getString(0);
call_type=cursor_object.getString(1);
call_date=cursor_object.getString(2);
call_duration=cursor_object.getString(3);
sb.append("\nPhone Number:--- " + ph_number +
" \nCall Type:--- " + call_type +
" \nCall Date:--- " + call_date
+ " \nCall duration in sec :--- " + call_duration);
sb.append("\n----------------------------------");
} while(cursor_object.moveToNext());
cursor_object.close(); // just added
return sb;
}
}
You should not close the gotten readable/writable database manually. It will be closed by the your dbHelper when you close it and will manage the synchronization with other open/close operations that could cause those exceptions.
来源：https://stackoverflow.com/questions/36589345/staledataexception-attempted-to-access-a-cursor-after-it-has-been-closed