What is the difference between Serializable and Parcelable ? Which is best approach in Android?

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Serializable is a standard Java interface. You simply mark a class Serializable by implementing the interface, and Java will automatically serialize it in certain situations.

Parcelable is an Android specific interface where you implement the serialization yourself. if a class implements Parcelable interface, then the instances of this class can be written to and restored from a Parcel.

用例：使用Bundle在设备旋转时保存 Parcelable 数据，prevent custom views from losing state across screen orientation changes。

Box.java

public class Box implements Parcelable {
    @Override
    public void writeToParcel(Parcel out, int flags) {
        out.writeValue(mOrigin);
        out.writeValue(mCurrent);
    }

    public static final Parcelable.Creator<Box> CREATOR = new Parcelable.Creator<Box>() {
        @Override
        public Box createFromParcel(Parcel in) {
            return new Box(in);
        }

        @Override
        public Box[] newArray(int size) {
            return new Box[size];
        }
    };

    private Box(Parcel in) {
        mOrigin = (PointF) in.readValue(null);
        mCurrent = (PointF) in.readValue(null);
    }
}

BoxDrawingView.java

public class BoxDrawingView extends View {
    private static final String PARCEL_KEY_STATE = "instanceState";
    private static final String PARCEL_KEY_BOXES = "boxes";

    @Override
    protected Parcelable onSaveInstanceState() {
        super.onSaveInstanceState();
        Bundle bundle = new Bundle();
        bundle.putParcelable(PARCEL_KEY_STATE, super.onSaveInstanceState());
        bundle.putParcelableArrayList(PARCEL_KEY_BOXES, mBoxes);
        return bundle;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) {
            Bundle bundle = (Bundle)state;
            mBoxes = bundle.getParcelableArrayList(PARCEL_KEY_BOXES);
            // 如果没有下面这行代码，将导致 IllegalArgumentException.
            // RuntimeException: Unable to start activity ComponentInfo{.DragAndDraw}:
            // java.lang.IllegalArgumentException: Wrong state class, expecting View State but received class Bundle instead.
            // This usually happens when two views of different type have the same id in the same hierarchy.            
            state = bundle.getParcelable(PARCEL_KEY_STATE);
        }
        super.onRestoreInstanceState(state);
    }
}