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Editorial Team
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Asked: 2026-05-25T22:51:20+00:00

I’ve got the following code to get a sum of real values (debt amounts

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I’ve got the following code to get a sum of real values (debt amounts stored in an SQlite DB:

public double getsumdebt() {
        Cursor mCursor = db.rawQuery("SELECT SUM(CurrentAmount) FROM tblDebts", null);
        if(mCursor.moveToFirst()) {
        return mCursor.getDouble(0);
    }
    return mCursor.getDouble(0);
    }

I am trying to return the sum of all the values in the “CurrentAmount” column and display it in a textview:

 DbAdapter db2 = new DbAdapter(this);
 double sum= new Double(db2.getsumdebt());
 //sum = db2.getsumdebt();
  bar.setText("Progress: "+currencysymbol +current +" / " + currencysymbol + sum);

however, when I run the app in the emulator, I get a Force close during launch, with the following in the DDMS log:

09-26 19:01:19.098: ERROR/AndroidRuntime(677): FATAL EXCEPTION: main
09-26 19:01:19.098: ERROR/AndroidRuntime(677): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.evanrich.android.debtdestroyer/com.evanrich.android.debtdestroyer.mainActivity}: java.lang.NullPointerException
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.os.Handler.dispatchMessage(Handler.java:99)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.os.Looper.loop(Looper.java:123)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.app.ActivityThread.main(ActivityThread.java:4627)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at java.lang.reflect.Method.invokeNative(Native Method)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at java.lang.reflect.Method.invoke(Method.java:521)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at dalvik.system.NativeStart.main(Native Method)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): Caused by: java.lang.NullPointerException
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at com.evanrich.android.debtdestroyer.database.DbAdapter.getsumdebt(DbAdapter.java:106)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at com.evanrich.android.debtdestroyer.mainActivity.onCreate(mainActivity.java:73)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
09-26 19:01:19.098: ERROR/AndroidRuntime(677): … 11 more

It looks like it’s not able to sum the real values stored in the DB. Can anyone help me?

FYI, this is my table constructor:

private static final String DATABASE_CREATE =
    "CREATE TABLE IF NOT EXISTS tblDebts (_id integer primary key autoincrement, "
    + "Debt text not null, StartingAmount real, CurrentAmount real, " 
    + "InterestRate real, DueDate integer, MinimumPayment real );";

Thanks.

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1 Answer

  1. Editorial Team

    You have an NPE

    19:01:19.098: ERROR/AndroidRuntime(677): Caused by: java.lang.NullPointerException 09-26 19:01:19.098: ERROR/AndroidRuntime(677): at com.evanrich.android.debtdestroyer.database.DbAdapter.getsumdebt(DbAdapter.java:106) 09-26

    Which is line 106?

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