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Start your free trialRyan Lentz
9,191 PointsIssue with Callback
I can't build the app because there is a problem with the Callback. Android Studio wants me to implement methods that would change the onFailure and onResponse methods, completely changing the code.
Error:(42, 41) error: <anonymous teamtreehouse.com.stormy.MainActivity$1> is not abstract and does not override abstract method onResponse(Call,Response) in Callback
package teamtreehouse.com.stormy;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;
import java.io.IOException;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity {
public static final String TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String apiKey = "27974c4bc33201748eaf542a6769c3b7";
double latitude = 37.8267;
double longitude = -122.423;
String forecastUrl = "https://api.forecast.io/forecast/" + apiKey +
"/" + latitude + "," + longitude;
if (isNetworkAvailable()) {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(forecastUrl)
.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Request request, IOException e) {
}
@Override
public void onResponse(Response response) throws IOException {
try {
Log.v(TAG, response.body().string());
if (response.isSuccessful()) {
} else {
alertUserAboutError();
}
} catch (IOException e) {
Log.e(TAG, "Exception caught: ", e);
}
}
});
}
else {
Toast.makeText(this, getString(R.string.network_unavailable_message),
Toast.LENGTH_LONG).show();
}
Log.d(TAG, "Main UI code is running!");
}
private boolean isNetworkAvailable() {
ConnectivityManager manager = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
boolean isAvailable = false;
if (networkInfo != null && networkInfo.isConnected()) {
isAvailable = true;
}
return isAvailable;
}
private void alertUserAboutError() {
AlertDialogFragment dialog = new AlertDialogFragment();
dialog.show(getFragmentManager(), "error_dialog");
}
}
1 Answer
Seth Kroger
56,413 PointsThe course uses an older version of OkHttp which has slightly different arguments in the Callback methods. You should use the ones suggested by the quick-fix. The only difference is the new versions include a reference to the Call, which you don't use anyway, so the code inside the methods should be the same.
Ryan Lentz
9,191 PointsRyan Lentz
9,191 PointsThanks, Seth. I didn't think that it would work because of the required Call, but it does.