okhttp3

• Android Networking Tutorial: Getting Started

dependencies {
      ...
    compile 'com.squareup.okhttp3:okhttp:3.5.0'
    compile 'com.jakewharton:butterknife:8.4.0'
    compile 'com.jakewharton:butterknife-compiler:8.4.0'
}

package kr.domain.testokhttp;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Button;
import android.widget.TextView;

import java.io.IOException;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;

public class MainActivity extends AppCompatActivity {

    private final static String TAG = MainActivity.class.getSimpleName();
    ProgressDialog mProgressDialog;

    OkHttpClient client = new OkHttpClient();
    public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");

    @BindView(R.id.textView) TextView textView;
    @BindView(R.id.button) Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ButterKnife.bind(this);

        Log.d(TAG, new Exception().getStackTrace()[0].getMethodName() );
    }

    @OnClick(R.id.button)
    void onCallClick(){
        Log.d(TAG, new Exception().getStackTrace()[0].getMethodName() );

        if (isNetworkConnected())
        {
            mProgressDialog = new ProgressDialog(this);
            mProgressDialog.setMessage("Please wait...");
            mProgressDialog.setCancelable(false);
            mProgressDialog.show();

            makeRequestWithOkHttp("https://raw.github.com/square/okhttp/master/README.md");
        } else {
            new AlertDialog.Builder(this)
                .setTitle("No Internet Connection")
                .setMessage("It looks like your internet connection is off. Please turn it on and try again")
                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                    }
                }).setIcon(android.R.drawable.ic_dialog_alert).show();
        }
    }

    private boolean isNetworkConnected() {
        ConnectivityManager connMgr = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
        return networkInfo != null && networkInfo.isConnected();
    }

    private boolean isWifiConnected() {
        ConnectivityManager connMgr = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
        return networkInfo != null && (ConnectivityManager.TYPE_WIFI == networkInfo.getType()) && networkInfo.isConnected();
    }

    private void makeRequestWithOkHttp(String url) {
        okhttp3.Request request = new okhttp3.Request.Builder().url(url).build();

        client.newCall(request).enqueue(new okhttp3.Callback() {
            @Override
            public void onFailure(okhttp3.Call call, IOException e) {
                e.printStackTrace();
            }

            @Override
            public void onResponse(okhttp3.Call call, okhttp3.Response response) throws IOException {
                final String result = response.body().string();  // 4

                MainActivity.this.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            mProgressDialog.hide();
                            textView.setText(result);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                });
            }
        });
    }
}