How cast from Float in object array to float variable?

Question

Hi I retrieve data and one Float value from sqlite and return in arraylist:

if (!cursor.isAfterLast())
        {
            do
            {
                ....
                rowArray.add(cursor.getFloat(2));
                ....
            }
            while (cursor.moveToNext());
        }

Problem occurred in float cast, when I try to set float variable from the list:

ArrayList<Object> row;
        row = db.getNameAsArray(name);

        mCurrentPrice=((Float)row.get(2)).floatValue();

There is no error but app FC in this line. Simple float cast doesnt work neither. Thx for any answer.

Logcat:

02-07 22:34:19.537: ERROR/Retrieve Error(632): java.lang.ClassCastException: java.lang.String

02-07 22:34:21.217: WARN/System.err(632): java.lang.ClassCastException: java.lang.String 02-07 22:34:21.267: WARN/System.err(632): at com.testing.retrieveDrinkName(DatabaseActivity.java:222) 02-07 22:34:21.527: WARN/System.err(632): at android.os.Handler.handleCallback(Handler.java:587) 02-07 22:34:21.547: WARN/System.err(632): at android.os.Handler.dispatchMessage(Handler.java:92) 02-07 22:34:21.596: WARN/System.err(632): at android.os.Looper.loop(Looper.java:123) 02-07 22:34:21.657: WARN/System.err(632): at android.app.ActivityThread.main(ActivityThread.java:4363) 02-07 22:34:21.667: WARN/System.err(632): at java.lang.reflect.Method.invokeNative(Native Method) 02-07 22:34:21.737: WARN/System.err(632): at java.lang.reflect.Method.invoke(Method.java:521) 02-07 22:34:21.769: WARN/System.err(632): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 02-07 22:34:21.797: WARN/System.err(632): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 02-07 22:34:21.817: WARN/System.err(632): at dalvik.system.NativeStart.main(Native Method)

Use logcat to see the error causing the FC. To see logcat, switch to the DDMS perspective in eclipse or run adb logcat on the command line. — Cheryl Simon
– Cheryl Simon, Commented Feb 7, 2011 at 22:20
So, a method named "getNameAsArray" returns float values? Why? — Ed Swangren
– Ed Swangren, Commented Feb 7, 2011 at 22:21
Since you have an array of Objects perhaps you would be better off doing an instanceof check before the cast? My bet is that you are not getting a Float object, and are trying to cast something else. Please provide your logcat output. — dave.c
– dave.c, Commented Feb 7, 2011 at 22:33

dave.c · Accepted Answer · 2011-02-07 22:45:24Z

4

As your last comment shows, you are trying to cast a String to a Float. Your code doesn't make it clear exactly the problem you are trying to solve, but if you have a String value and would like a float, you can do:

mCurrentPrice = Float.parseFloat(stringValue);

answered Feb 7, 2011 at 22:45

dave.c

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3 Comments

Cheryl Simon Over a year ago

@Hruskozrout Yes, the stacktrace shows that it is a ClassCastException. You can't turn a String into a float by casting it, you need to use the parse method as dave.c describes.

Hruskozrout Over a year ago

Thanks dave.c and Mayra, with dave.c method its works, I was thinking when do rowArray.add(cursor.getFloat(2)); its Float it looks like all row is represented by String values.. I must review my code again. Thanks for your time.

dave.c Over a year ago

would the downvoter care to explain how they feel this answer could be improved?

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