CODEWITHSUNDEEP
javaandroidokhttp
Nathiel Barros
Nathiel Barros

Reputation: 715

How to create Singleton OkHtpp Class and handle previous requests

I'm using Google Autocomplete Places API with android and what I'm trying to do is:

  1. Every time the user type a char inside of the EditText it needs to make a new request to get the predictions results.
  2. I need to cancel the previous request because the only result that I need is the final address/location the user typed.
  3. And then work out with some logic to clean the RecyclerView if the location length is less then 3 chars.

That's why I need a singleton instance, I tried this :

public class OkHttpSingleton extends OkHttpClient {
private static  OkHttpClient client = new OkHttpClient();

public static OkHttpClient getInstance() {
    return client;
}

public OkHttpSingleton() {}

public void CloseConnections(){
    client.dispatcher().cancelAll();
}
public List<PlacePredictions> getPredictions(){
    //// TODO: 26/09/2017  do the request!
    return null;
}

}

But I'm not sure if it is the right way to do, because in the doc it says that the dispatcher().cancelAll() method cancel all the requests But I know that way is wrong! I'm more concerned in how to create a singleton then the rest.

The Main Activity:

Address.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            if(s.length() > 3){
                _Address = Address.getText().toString();
                new AsyncTask<Void, Void, String>() {
                    @Override
                    protected void onPreExecute() {
                        super.onPreExecute();
                    }

                    @Override
                    protected String doInBackground(Void... params) {
                        try { // request...
                    }else{Clear the RecyclerView!}

Upvotes: 3

Views: 4583

Answers (1)

Mehmed
Mehmed

Reputation: 3050

You can implement a singleton helper class that keeps one OkHttpClient and cover all of your custom functionalities using this one particular client:

public class OkHttpSingleton {

    private static OkHttpSingleton singletonInstance;

    // No need to be static; OkHttpSingleton is unique so is this.
    private OkHttpClient client;

    // Private so that this cannot be instantiated.
    private OkHttpSingleton() {
        client = new OkHttpClient.Builder()
            .retryOnConnectionFailure(true)
            .build();
    }

    public static OkHttpSingleton getInstance() {
        if (singletonInstance == null) {
            singletonInstance = new OkHttpSingleton();
        }
        return singletonInstance;
    }

    // In case you just need the unique OkHttpClient instance.
    public OkHttpClient getClient() {
        return client;
    }

    public void closeConnections() {
        client.dispatcher().cancelAll();
    }

    public List<PlacePredictions> getPredictions(){
        // TODO: 26/09/2017  do the request!
        return null;
    }
}

Example use:

OkHttpSingleton localSingleton = OkHttpSingleton.getInstance();
...
localSingleton.closeConnections();
...
OkHttpClient localClient = localSingleton.getClient();
// or
OkHttpClient localClient = OkHttpSingleton.getInstance().getClient();

Upvotes: 8

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