achartengine Balkendiagramm von SQLite-Datenbank

Question

Im Versuch, einen achartengine Balkendiagramm von Daten in meiner SQLite-Datenbank zu erstellen, aber wenn ich versuche, den Datensatz für das Balkendiagramm ich die folgenden Fehlermeldung erhalten zu füllen:

Caused by: java.lang.IllegalStateException: Couldn't read row 1, col 1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. 

Testadapter .java

public Cursor getDaysGraphDataY() 
{ 
    try 
    { 
     String sql ="SELECT data FROM v_data_main WHERE datatype = 'd' ORDER BY CAST(number AS INTEGER) DESC"; 

     Cursor mCur = mDb.rawQuery(sql, null); 
     if (mCur!=null) 
     { 
      mCur.moveToNext(); 
     } 
     return mCur; 
    } 
    catch (SQLException mSQLException) 
    { 
     Log.e(TAG, "getDaysGraphDataY >>"+ mSQLException.toString()); 
     throw mSQLException; 
    } 
} 

public Cursor getDaysGraphDataX() 
{ 
    try 
    { 
     String sql ="SELECT number FROM v_data_main WHERE datatype = 'd' ORDER BY CAST(number AS INTEGER) DESC"; 

     Cursor mCur = mDb.rawQuery(sql, null); 
     if (mCur!=null) 
     { 
      mCur.moveToNext(); 
     } 
     return mCur; 
    } 
    catch (SQLException mSQLException) 
    { 
     Log.e(TAG, "getDaysGraphDataX >>"+ mSQLException.toString()); 
     throw mSQLException; 
    } 
} 

BarChart.java

public class BarGraph{ 

public Intent getIntent(Context context) 
{ 
    // Bar 1 
    //int[] y = { 124, 135, 443, 456, 234, 123, 342, 134, 123, 643, 234, 274 }; 
    //context = context.getApplicationContext(); 
    TestAdapter mDbHelper = new TestAdapter(context); 
    mDbHelper.createDatabase(); 
    mDbHelper.open(); 

    Cursor getDataY = mDbHelper.getDaysGraphDataY(); 
    Cursor getDataX = mDbHelper.getDaysGraphDataX(); 

    int rowsY = getDataY.getCount(); 
    int rowsX = getDataX.getCount(); 

    getDataY.moveToFirst(); 
    getDataX.moveToFirst(); 

    CategorySeries series = new CategorySeries("Demo Bar Graph 1"); 
    for (int i = 0; i < rowsY; i++) { 
     series.add(getDataX.getString(i), getDataY.getInt(i)); 
     getDataY.moveToNext(); 
     getDataX.moveToNext(); 
    } 
    mDbHelper.close(); 
    /* 
    // Bar 2 
    int[] y2 = { 224, 235, 243, 256, 234, 223, 242, 234, 223, 243, 234, 274 }; 
    CategorySeries series2 = new CategorySeries("Demo Bar Graph 2"); 
    for (int i = 0; i < y.length; i++) { 
     series2.add("Bar " + (i+1), y2[i]); 
    } 
    */ 

    XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset(); 
    dataset.addSeries(series.toXYSeries()); 
    //dataset.addSeries(series2.toXYSeries()); 

    // This is how the "Graph" itself will look like 
    XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer(); 
    mRenderer.setChartTitle("Demo Graph Title"); 
    mRenderer.setXTitle("X VALUES"); 
    mRenderer.setYTitle("Y VALUES"); 
    mRenderer.setAxesColor(Color.GREEN); 
    mRenderer.setLabelsColor(Color.RED); 
    // Customize bar 1 
    XYSeriesRenderer renderer = new XYSeriesRenderer(); 
    renderer.setDisplayChartValues(true); 
    renderer.setChartValuesSpacing((float) 0.5); 
    mRenderer.addSeriesRenderer(renderer); 
    // Customize bar 2 
    XYSeriesRenderer renderer2 = new XYSeriesRenderer(); 
    renderer.setColor(Color.CYAN); 
    renderer.setDisplayChartValues(true); 
    renderer.setChartValuesSpacing((float) 0.5); 
    mRenderer.addSeriesRenderer(renderer2); 

    Intent intent = ChartFactory.getBarChartIntent(context, dataset,mRenderer, Type.DEFAULT); 
    return intent; 
} 

}

Ich habe versucht, eine _id Spalte wie in einer anderen Frage vorgeschlagen und auch die App zu deinstallieren und neu zu installieren. Hier

ist die volle logcat:

04-16 17:38:23.625 3334-3334/? E/CursorWindow: Failed to read row 1, column 1 from a CursorWindow which has 30 rows, 1 columns. 
04-16 17:38:23.629 3334-3334/? D/AndroidRuntime: Shutting down VM 
04-16 17:38:23.630 3334-3334/? E/AndroidRuntime: FATAL EXCEPTION: main 
               Process: com.marnistek.serverstats, PID: 3334 
               java.lang.IllegalStateException: Could not execute method for android:onClick 
                at android.view.View$DeclaredOnClickListener.onClick(View.java:4452) 
                at android.view.View.performClick(View.java:5198) 
                at android.view.View$PerformClick.run(View.java:21147) 
                at android.os.Handler.handleCallback(Handler.java:739) 
                at android.os.Handler.dispatchMessage(Handler.java:95) 
                at android.os.Looper.loop(Looper.java:148) 
                at android.app.ActivityThread.main(ActivityThread.java:5417) 
                at java.lang.reflect.Method.invoke(Native Method) 
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
                Caused by: java.lang.reflect.InvocationTargetException 
                at java.lang.reflect.Method.invoke(Native Method) 
                at android.view.View$DeclaredOnClickListener.onClick(View.java:4447) 
                at android.view.View.performClick(View.java:5198)  
                at android.view.View$PerformClick.run(View.java:21147)  
                at android.os.Handler.handleCallback(Handler.java:739)  
                at android.os.Handler.dispatchMessage(Handler.java:95)  
                at android.os.Looper.loop(Looper.java:148)  
                at android.app.ActivityThread.main(ActivityThread.java:5417)  
                at java.lang.reflect.Method.invoke(Native Method)  
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  
                Caused by: java.lang.IllegalStateException: Couldn't read row 1, col 1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. 
                at android.database.CursorWindow.nativeGetString(Native Method) 
                at android.database.CursorWindow.getString(CursorWindow.java:438) 
                at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51) 
                at com.marnistek.serverstats.BarGraph.getIntent(BarGraph.java:36) 
                at com.marnistek.serverstats.GraphAChartEngineActivity.barGraphHandler(GraphAChartEngineActivity.java:27) 
                at java.lang.reflect.Method.invoke(Native Method)  
                at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)  
                at android.view.View.performClick(View.java:5198)  
                at android.view.View$PerformClick.run(View.java:21147)  
                at android.os.Handler.handleCallback(Handler.java:739)  
                at android.os.Handler.dispatchMessage(Handler.java:95)  
                at android.os.Looper.loop(Looper.java:148)  
                at android.app.ActivityThread.main(ActivityThread.java:5417)  
                at java.lang.reflect.Method.invoke(Native Method)  
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  

Jede Hilfe wäre sehr willkommen.

Answer 1

Ich habe es durch die Änderung meiner Schleife aus arbeiten:

for (int i = 0; i < rowsY; i++) { 
    series.add(getDataX.getString(i), getDataY.getInt(i)); 
    getDataY.moveToNext(); 
    getDataX.moveToNext(); 
} 

An:

for (int i = 0; i < rows; i++) { 
     series.add(getData.getString(getData.getColumnIndex("number")), getData.getInt(getData.getColumnIndex("data"))); 
     getData.moveToPosition(i); 
    } 

habe ich es auch zu Verwenden Sie nur einen Cursor, um alle benötigten Spalten aus der db zu erhalten, anstatt einen separaten Cursor für jedes X und Y a zu haben x

Answer 2

Diese Ausnahmen sind beim Versuch aufgetreten, primitive Werte (int, long) vom Cursor abzurufen. Leider hat keine der beiden Ausnahmen erklärt, was das Problem wirklich ist. Es ist auch wichtig zu erwähnen, dass diese Ausnahmen nicht mit einer bestimmten Android-API-Version oder einer bestimmten Geräteherstellung korrelieren.

Bitte folgen Sie diesem Link für weitere Informationen:
http://blog.tapreason.com/2014/03/02/how-to-resolve-java-lang-illegalstateexception-couldnt-read-row-0-col-y-from-cursorwindow-make-sure-the-cursor-is-initialized-correctly-before-accessing-data-from-it/