Rick Grimes The Coder Rick Grimes The Coder -3 years ago 108
Android Question

Using Float instead of float (Primitive type) when implementing Parcelable

Requirement: Find out if

price
is null. Since a primitive float data type cannot be checked for null since its always 0.0, I opted out to use
Float
instead, as it can be checked for null.

public class QOptions implements Parcelable {
public String text;
public Float price;
}

protected QOptions(Parcel in) {
text = in.readString();
unit_price = in.readFloat();
}

@Override
public void writeToParcel(Parcel parcel, int i) {
parcel.writeString(this.text);
parcel.writeFloat(this.price);
}


However, since the class also implements
Parcelable
, the
writeToParcel
crashes with the following exception:


Attempt to invoke virtual method 'float java.lang.Float.floatValue()' on a null object reference


And the exception points to this line:


parcel.writeFloat(this.price);


How can I use the
Float
data type along with writeToParcel and not cause the exception? Or is there a better way to accomplish my requirement? I just need the price to be null if it's null.

Answer Source

You can handle it in the below manner.

@Override
public void writeToParcel(Parcel dest, int flags) {
    if (price == null) {
        dest.writeByte((byte) (0x00));
    } else {
        dest.writeByte((byte) (0x01));
        dest.writeFloat(price);
    }
}

To read the value of float -

unit_price = in.readByte() == 0x00 ? null : in.readFloat();
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