使用反射在Java for Android中强制转换对象

Question

How can i reduce this to a couple of lines using reflection in java for android?

( _properties is a ContentValues object and value is an object)

    if (value instanceof String)
    {
        this._properties.put(   key,    value.toString());
    } else if (value instanceof Long) {
        this._properties.put(   key,    Long.valueOf(value.toString()));
    } else if (value instanceof Integer) {
        this._properties.put(   key,    Integer.valueOf(value.toString()));
    } else if (value instanceof Boolean) {
        this._properties.put(   key,    Boolean.valueOf(value.toString()));
    } else if (value instanceof Byte) {
        this._properties.put(   key, Byte.valueOf(value.toString()));
    } else ...

Answer 1

No reflection needed:

 _properties.put(key, value.toString());

Unfortunately ContentValues does not have put(String, Object) even though internally the values are stored in HashMap<String, Object> .

Why storing values as String works is that all ContentValues getAsFoo() accessors support converting to Foo from String .