doinbackground中的异常，同时asynctask [复制]

这个问题在这里已有答案：

• Problems using unirest in Android Studio 1回答

• Why am I getting a NoClassDefFoundError in Java? 20个答案

MainActivity.java

public class MainActivity extends AppCompatActivity {

   Button clickButton;
   protected void onCreate(Bundle savedInstanceState)
   {

       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       clickButton = (Button) findViewById(R.id.clickButton);
       clickButton.setOnClickListener(new View.OnClickListener()
       {
           public void onClick(View v)
           {

              String serverURL= ""
              new MyClass().execute("serverURL");
           }
       });

    private class MyClass extends AsyncTask<String, Integer, String>
    {

        TextView output = (TextView) findViewById(R.id.textView1);
        private ProgressDialog Dialog = new    ProgressDialog(MainActivity.this);

        protected void onPreExecute() {

            output.setText("Output : ");
            Dialog.setMessage("Downloading source..");
            Dialog.show();
        }

        protected String doInBackground(String... urls)
        {
            HttpResponse<JsonNode> response=null;
            try {
            }


            response = Unirest.post("https://....?api_key=""&api_secret=")
                    .header("X-Mashape-Key", "")
                    .header("Content-Type", "application/x-www-form-
                            urlencoded")
                                    .header("Accept", "application/json")
                                    .field("attributes", "all")
                                    .field("detector", "Aggressive")
                                    .field("urls", urls[0])
                                    .asJson();


        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return response.toString();


    }

protected void onProgressUpdate(Integer...integers) {
}

protected void onPostExecute(String response) {
    output = (TextView) findViewById(R.id.textView1);
    output.setText(response);
}

}
}

错误

在java.util.concurrent.FutureTask $ Sync.innerSetException（java.util.concurrent.FutureTask中的FutureTask.jav）上，在android.os.AsyncTask $ 3.done（AsyncTask.java:299）上执行doInBackground（）时发生错误 . setExcept at java.util.concurrent.FutureTask $ Sync.innerRun（FutureTask.java:307）at java.util.concurrent.FutureTask.run（FutureTask.java:137）at android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask） .java：230）：执行doInBackground（）时发生错误android.os.AsyncTask $ 3.done（AsyncTask.java:299）java.util.concurrent.FutureTask java.util.concurrent.FutureTask.setException $ Sync.innerSetException （FutureTask.java:124）java.util.concurrent.FutureTask $ Sync.innerRun（FutureTask.java:307）at java.util.concurrent.FutureTask.run（FutureTask.java:137）at android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:230）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1076）在java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:569）在java.lang.Thread.run（Thread.java:856）产生的原因：在com.mashape.unirest.http.HttpClientHelper.prepareRequest java.lang.ExceptionInInitializerError（HttpClientHelper.java:151）在com.mashape.unirest.http .HttpClientHelper.request（HttpClientHelper.java:131）在com.mashape.unirest.request.BaseRequest.asJson（BaseRequest.java:68）在com.example.preeti.button.MainActivity $ MyClass.doInBackground（MainActivity.java:91 ）at com.example.preeti.button.MainActivity $ MyClass.doInBackground（MainActivity.java:60）at android.os.AsyncTask $ 2.call（AsyncTask.java:287）at java.util.concurrent.FutureTask $ Sync.innerRun （FutureTask.java:305）在java.util.concurrent.ThreadPoolExecutor的android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:230）java.util.concurrent.FutureTask.run（FutureTask.java:137） .runWorker（ThreadPoolExecutor.java:1076）at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:569）at java.lang.Thread.run（Thread.java:856）引起：java.lang . NoClassDefFoundError：o com.mashape.unirest.http.options.Options.refresh（Options.java:70）中的rg.apache.http.client.config.RequestConfig位于com.mashape.unirest.http.options.Options . （Options.java： 46）在com.mashape.unirest.http.HttpClientHelper.prepareRequest（HttpClientHelper.java:151）在com.mashape.unirest.http.HttpClientHelper.request（HttpClientHelper.java:131）在com.mashape.unirest.request.BaseRequest .asJson（BaseRequest.java:68）在com.example.preeti.button.MainActivity $ MyClass.doInBackground（MainActivity.java:91）在com.example.preeti.button.MainActivity $ MyClass.doInBackground（MainActivity.java:60 ）at java.util.concurrent.FutureTask $ Sync.innerRun（FutureTask.java:305）at java.util.concurrent.FutureTask.run（FutureTask.java）的android.os.AsyncTask $ 2.call（AsyncTask.java:287） ：137）在android.os.AsyncTask $ SerialExecutor $ 1.run（在java.util.concurrent.ThreadPoolExecutor中的$ Worker.run AsyncTask.java:230）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1076） （ThreadPoolExecutor.java:569）at java.lang.Thread.run（Thread.java:856）

Build.gradle

apply plugin: 'com.android.application'


android {
compileSdkVersion 23
buildToolsVersion "24.0.0"

defaultConfig {
    applicationId "com.example.preeti.button"
    minSdkVersion 16
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'),
'proguard-rules.pro'
    }}
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
    }
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.github.mhendred.face4j:face4j-core:1.6.2'
compile 'com.mashape.unirest:unirest-java:1.4.9'
compile 'com.google.android.gms:play-services-appindexing:8.1.0'
compile 'org.json:json:20140107'
compile 'org.apache.httpcomponents:httpcomponents-client:4.5.2'
compile 'com.loopj.android:android-async-http:1.4.9'



}