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POAndroid Cursor crash
 

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    <p>i've searched on web and stackoverflow but couldnt find the solution i need. In my application, i record the accelerometer coordinate values to a database, and then when user clicks on the button it writes it to a file and generate some features for this coordinate values (like standart deviation,average,max,min etc. for the given time interval) finally, it writes this features to a file too. But when i ever tried to generate these features and write it to a file, it crashed and gave that out.</p> <pre class="lang-none prettyprint-override"><code>Failed to read row 0, column -1 from a CursorWindow which has 1 rows, 1 columns. FATAL EXCEPTION: main java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. at android.database.CursorWindow.nativeGetDouble(Native Method) at android.database.CursorWindow.getDouble(CursorWindow.java:543) at android.database.CursorWindow.getFloat(CursorWindow.java:594) at android.database.AbstractWindowedCursor.getFloat(AbstractWindowedCursor.java:81) at com.example.coordinates.MainActivity.generateFeatures(MainActivity.java:259) at com.example.coordinates.MainActivity.dosyayaYaz(MainActivity.java:239) at com.example.coordinates.MainActivity.onDialogPositiveClick(MainActivity.java:668) at com.example.coordinates.dialogFragement$1.onClick(dialogFragement.java:54) at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:167) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4898) 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:1006) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>this is where i think i get error.</p> <pre><code>private void generateFeatures(String label){ boolean bitti=false; Cursor firstTimeHandler=db.rawQuery("SELECT MIN(zaman) FROM Koordinatlar", null); firstTimeHandler.moveToFirst(); float firstTime= firstTimeHandler.getFloat(firstTimeHandler.getColumnIndex("zaman")); float nextTime=firstTime+3000; Cursor lastTimeHandler=db.rawQuery("SELECT MAX(zaman) FROM Koordinatlar", null); lastTimeHandler.moveToFirst(); float lastTime=lastTimeHandler.getFloat(firstTimeHandler.getColumnIndex("zaman")); while(!bitti){ calculateAverage(firstTime,nextTime); calculateStandartDev(firstTime,nextTime); calculateAverageAbsoluteDifferance(firstTime,nextTime); calculateAverageResultant(firstTime,nextTime); calculateMax(firstTime,nextTime); firstTime=nextTime; nextTime=nextTime+3000; if(nextTime&gt;=lastTime){ nextTime=lastTime; calculateAverage(firstTime,nextTime); calculateStandartDev(firstTime,nextTime); calculateAverageAbsoluteDifferance(firstTime,nextTime); calculateAverageResultant(firstTime,nextTime); calculateMax(firstTime,nextTime); bitti=true; } } dosyayaYaz2(label); } </code></pre>
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