Is there a way that I can convert int/short values to booleans? I\'m receiving JSON that looks like this:
{ is_user: \"0\", is_guest: \"0\" }
I
Start by getting Gson 2.2.2 or later. Earlier versions (including 2.2) don't support type adapters for primitive types. Next, write a type adapter that converts integers to booleans:
private static final TypeAdapter<Boolean> booleanAsIntAdapter = new TypeAdapter<Boolean>() {
@Override public void write(JsonWriter out, Boolean value) throws IOException {
if (value == null) {
out.nullValue();
} else {
out.value(value);
}
}
@Override public Boolean read(JsonReader in) throws IOException {
JsonToken peek = in.peek();
switch (peek) {
case BOOLEAN:
return in.nextBoolean();
case NULL:
in.nextNull();
return null;
case NUMBER:
return in.nextInt() != 0;
case STRING:
return Boolean.parseBoolean(in.nextString());
default:
throw new IllegalStateException("Expected BOOLEAN or NUMBER but was " + peek);
}
}
};
... and then use this code to create the Gson instance:
Gson gson = new GsonBuilder()
.registerTypeAdapter(Boolean.class, booleanAsIntAdapter)
.registerTypeAdapter(boolean.class, booleanAsIntAdapter)
.create();
If you're reading them in as ints or shorts, then you can just
boolean b = (i != 0)
Where b is the boolean you want to get and i is the int or short value.
If you're reading them in as Strings then you want
boolean b = !s.equals("0"); // use this if you WANT null pointer exception
// if the string is null, useful for catching
// bugs
or
boolean b = !"0".equals(s); // avoids null pointer exception, but may silently
// let a bug through