目前我正在处理Stormy Treehouse Android app。我想使用square OkHttpClient，但在导入类时收到错误"无法解析符号okhttp3"：import com.squareup.okhttp3.OkHttpClient;。将okhttp3替换为okhttp无法修复错误。感谢您的帮助。

MainActivity.java

...

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

// cannot resolve symbol 'okhttp3'
import com.squareup.okhttp3.OkHttpClient;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        String apiKey = "...";
        double latitude = 45.5124;
        double longitude = -73.5547;
        String forecastUrl = "https://api.forecast.io/forecast/" + apiKey + "/" + latitude + "," + longitude;
        // Cannot resolve symbol
        OkHttpClient client = new OkHttpClient();

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    } // onCreate()
} // MainActivity

build. gradle（模块：应用程序）

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "..."
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.squareup.okhttp3:okhttp:3.0.1'
}