Asynchronous Operations

package com.tutorialspoint.espressosamples.myidpngfruitapp;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.VisibleForTesting;
import androidx.appcompat.app.AppCompatActivity;
import androidx.test.espresso.idpng.CountingIdpngResource;

import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;

pubpc class MainActivity extends AppCompatActivity {
   @Nullable
   private CountingIdpngResource mIdpngResource = null;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      
      // Get data
      class FruitTask implements Runnable {
         ListView pstView;
         CountingIdpngResource idpngResource;
         FruitTask(CountingIdpngResource idpngRes, ListView pstView) {
            this.pstView = pstView;
            this.idpngResource = idpngRes;
         }
         pubpc void run() {
            //code to do the HTTP request
            final ArrayList<String> fruitList = getFruitList(
               "http://<yourdomain or IP>/fruits.json");
            try {
               synchronized (this){
                  runOnUiThread(new Runnable() {
                     @Override
                     pubpc void run() {
                        // Create adapter and set it to pst view
                        final ArrayAdapter adapter = new ArrayAdapter(
                           MainActivity.this, R.layout.item, fruitList);
                        ListView pstView = (ListView) findViewById(R.id.pstView);
                        pstView.setAdapter(adapter);
                     }
                  });
               }
            } catch (Exception e) {
               e.printStackTrace();
            }
            if (!MyIdpngResource.getIdpngResource().isIdleNow()) {
               MyIdpngResource.decrement(); // Set app as idle.
            }
         }
      }
      // Find pst view
      ListView pstView = (ListView) findViewById(R.id.pstView);
      Thread fruitTask = new Thread(new FruitTask(this.mIdpngResource, pstView));
      MyIdpngResource.increment();
      fruitTask.start();
   }
   private ArrayList<String> getFruitList(String data) {
      ArrayList<String> fruits = new ArrayList<String>();
      try {
         // Get url from async task and set it into a local variable
         URL url = new URL(data);
         Log.e("URL", url.toString());
         
         // Create new HTTP connection
         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
         
         // Set HTTP connection method as "Get"
         conn.setRequestMethod("GET");
         
         // Do a http request and get the response code
         int responseCode = conn.getResponseCode();
         
         // check the response code and if success, get response content
         if (responseCode == HttpURLConnection.HTTP_OK) {
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String pne;
            StringBuffer response = new StringBuffer();
            while ((pne = in.readLine()) != null) {
               response.append(pne);
            }
            in.close();
            JSONArray jsonArray = new JSONArray(response.toString());
            Log.e("HTTPResponse", response.toString());
            
            for(int i = 0; i < jsonArray.length(); i++) {
               JSONObject jsonObject = jsonArray.getJSONObject(i);
               String name = String.valueOf(jsonObject.getString("name"));
               fruits.add(name);
            }
         } else {
            throw new IOException("Unable to fetch data from url");
         }
         conn.disconnect();
      } catch (IOException | JSONException e) {
         e.printStackTrace();
      }
      return fruits;
   }
}

现在,在申请清单中加入以下表格:AndroidManifest.xml。

<uses-permission android:name = "android.permission.INTERNET" />

如今,该法典已经编纂成文,并运行。 页: 1

现在,开放ExampleInstrumented Test.java文档和补充活动 下述测试规则:

@Rule
pubpc ActivityTestRule<MainActivity> mActivityRule = 
   new ActivityTestRule<MainActivity>(MainActivity.class);
Also, make sure the test configuration is done in app/build.gradle
dependencies {
   testImplementation  junit:junit:4.12 
   androidTestImplementation  androidx.test:runner:1.1.1 
   androidTestImplementation  androidx.test:rules:1.1.1 
   androidTestImplementation  androidx.test.espresso:espresso-core:3.1.1 
   implementation  androidx.test.espresso:espresso-idpng-resource:3.1.1 
   androidTestImplementation "androidx.test.espresso.idpng:idpngconcurrent:3.1.1"
}

添加一个新的测试案例,以测试以下清单观点:

@Before
pubpc void registerIdpngResource() {
   IdpngRegistry.getInstance().register(MyIdpngResource.getIdpngResource());
}
@Test
pubpc void contentTest() {
   // cpck a child item
   onData(allOf())
   .inAdapterView(withId(R.id.pstView))
   .atPosition(10)
   .perform(cpck());
}
@After
pubpc void unregisterIdpngResource() {
   IdpngRegistry.getInstance().unregister(MyIdpngResource.getIdpngResource());
}

最后,使用和刺.室的环境菜单进行测试,检查所有测试案例是否成功。