DRY: case with AsyncTasks

Question

I am developing an Android application that has many different requests for web services. Each query is executed in a subclass AsyncTaskas follows:

(new AsyncTask<String, Void, Object1>() {
    @Override
    protected Object1 doInBackground(String... params) {
        // network request and parsing to Object1
        Object1 obj = new Object1();
        obj1 = Parser.parseObject1(httpClient.execute(...));
        return obj1;
    }

    @Override
    protected Object1 onPostExecute(Object1... ret) {
        return ret[0];
    }
}).execute();

Object1is a placeholder for the different objects ( Car, Bicycle, Truck...), each of which is in another AsyncTask.

What are my alternatives besides returning httpClient's output Stringand parsing in the main thread (user interface thread)? Avoid parsing in the user interface. Sounds reasonable if it parses a lot of data, right?

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Answer 1

, . .

public class SpecialAsyncTask<T> extends AsyncTask<String, Void, T> {

    public interface ResultProvider<T> {
        T generateResultInBackground(String... params);
    }

    public interface ResultConsumer<T> {
        void handleResultInForeground(T result);
    }

    private final ResultProvider<T> mProvider;
    private final ResultConsumer<T> mConsumer;
    private SpecialAsyncTask(ResultProvider<T> provider, ResultConsumer<T> consumer) {
        mProvider = provider;
        mConsumer = consumer;
    }

    @Override
    protected T doInBackground(String... params) {
        return mProvider.generateResultInBackground(params);
    }

    @Override
    protected void onPostExecute(T result) {
        mConsumer.handleResultInForeground(result);
    }

    public static <T> void execute(ResultProvider<T> provider, ResultConsumer<T> consumer, String... params) {
        new SpecialAsyncTask<T>(provider, consumer).execute(params);
    }
}

, Object1 , , , AsyncTask.

, , :

class Providers {
    public static final ResultProvider<String> HTTP_GETTER = new ResultProvider<String>() {

        @Override
        public String generateResultInBackground(String... params) {
            return MagicHttpLibrary.getContentAsString(params[0]);
        }

    };
}

Providers.HTTP_GETTER doInBackground. , (, )

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class User extends Activity implements ResultConsumer<String> {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        SpecialAsyncTask.execute(Providers.HTTP_GETTER, this , "http://google.com");
        SpecialAsyncTask.execute(Providers.HTTP_GETTER, this , "http://yahoo.com");
    }

    @Override
    public void handleResultInForeground(String result) {
        Toast.makeText(this, result, Toast.LENGTH_LONG).show();
    }
}

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Answer 2

Google Volley HTTP . , .