dependencies {  compile fileTree(include: ['*.jar'], dir: 'libs')  androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {   exclude group: 'com.android.support', module: 'support-annotations'  })  compile 'com.android.support:appcompat-v7:24.1.1'  testCompile 'junit:junit:4.12'  compile 'com.squareup.okhttp3:okhttp:3.6.0'  compile 'com.google.code.gson:gson:2.2.4' } 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  android:orientation="vertical"  tools:context="com.yjp.deliverynoquerydemo.MainActivity">   <Spinner   android:id="@+id/delivery_company_spinner"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_margin="5dp"   android:entries="@array/delivery_company"/>   <EditText   android:id="@+id/delivery_no_edit_text"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_margin="5dp"   android:hint="@string/please_enter_delivery_no"   android:inputType="number"/>   <Button   android:id="@+id/query_button"   android:layout_gravity="center"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_margin="5dp"   android:text="@string/query"/>   <ListView   android:id="@+id/messages_list_view"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:layout_margin="5dp"   android:listSelector="@android:color/transparent"/> </LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent">   <TextView   android:id="@+id/time_text_view"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:textStyle="bold"   android:textAppearance="?android:textAppearanceMedium"   android:typeface="monospace"/>   <TextView   android:id="@+id/context_text_view"   android:layout_width="match_parent"   android:layout_height="50dp"   android:textAppearance="?android:textAppearanceSmall"   android:typeface="monospace"/>  </LinearLayout> 

<resources>  <string name="app_name">快遞查詢</string>  <string name="please_enter_delivery_no">請輸入快遞單號</string>  <string name="query">查詢</string>  <string name="query_url">http://www.kuaidi100.com/query</string> </resources> 

<?xml version="1.0" encoding="utf-8"?> <resources>  <string-array name="delivery_company">   <item>順豐</item>   <item>EMS</item>   <item>快捷</item>  </string-array>   <string-array name="delivery_company_id">   <item>shunfeng</item>   <item>ems</item>   <item>kuaijiesudi</item>  </string-array> </resources> 

package com.yjp.deliverynoquerydemo.global;  import android.app.Application;  import com.yjp.deliverynoquerydemo.R;  import java.util.HashMap; import java.util.Map;  public class MyApplication extends Application {   private Map<String, String> mDeliveryCompanyTable = new HashMap<>();   public String getDeliveryCompanyNo(String deliveryCompanyName) throws RuntimeException {    if (mDeliveryCompanyTable.isEmpty()) {    String[] names = getResources().getStringArray(R.array.delivery_company);    String[] ids = getResources().getStringArray(R.array.delivery_company_id);     if (names.length != ids.length) {     throw new RuntimeException();    }     for (int i = 0; i < names.length; i++) {     mDeliveryCompanyTable.put(names[i], ids[i]);    }   }    return mDeliveryCompanyTable.get(deliveryCompanyName);  } } 

package com.yjp.deliverynoquerydemo.modal;  import java.util.List;  public class DeliveryMessages {   //派送單號  private String nu;   //快遞公司名稱  private String com;   //快遞信息  private List<Message> data;   //消息類  public static class Message {    //時間，格式為年-月-日 時:分:秒   private String time;    //詳細信息內容   private String context;    public String getTime() {    return time;   }    public void setTime(String time) {    this.time = time;   }    public String getContext() {    return context;   }    public void setContext(String context) {    this.context = context;   }  }   public String getNu() {   return nu;  }   public void setNu(String nu) {   this.nu = nu;  }   public String getCom() {   return com;  }   public void setCom(String com) {   this.com = com;  }   public List<Message> getData() {   return data;  }   public void setData(List<Message> data) {   this.data = data;  } } 

package com.yjp.deliverynoquerydemo.tools;  import com.google.gson.Gson; import com.yjp.deliverynoquerydemo.modal.DeliveryMessages;  import java.io.IOException; import java.net.SocketTimeoutException; import java.util.Map; import java.util.concurrent.TimeUnit;  import okhttp3.Call; import okhttp3.Callback; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response;  public class DeliveryMessageGetter {   //異步請求監聽接口  public interface DeliveryMessageGetterListener {   void onSuccess(DeliveryMessages deliveryMessages);   void onFailure(String errorStr);  }   //okHttp  private OkHttpClient mOkHttpClient = new OkHttpClient.Builder()    .readTimeout(10, TimeUnit.SECONDS)    .writeTimeout(10, TimeUnit.SECONDS)    .connectTimeout(10, TimeUnit.SECONDS)    .build();   //異步GET請求  public void getAsync(final String url,        final Map<String, String> params,        final DeliveryMessageGetterListener listener) {    //構建請求URL   String requestString = url;   if (!params.isEmpty()) {    requestString += "?";    for (Map.Entry<String, String> entry : params.entrySet()) {     requestString += entry.getKey() + "=" + entry.getValue() + "&";    }    requestString = requestString.substring(0, requestString.length() - 1);   }    //創建一個Request   final Request request = new Request.Builder()     .url(requestString)     .build();    //請求加入調度   Call call = mOkHttpClient.newCall(request);   call.enqueue(new Callback() {    @Override    public void onFailure(Call call, IOException e) {     if(e.getCause().equals(SocketTimeoutException.class)) {      listener.onFailure("查詢超時");     } else {      listener.onFailure("查詢失敗");     }    }     @Override    public void onResponse(Call call, Response response) throws IOException {     String messages = response.body().string();     Gson gson = new Gson();     DeliveryMessages deliveryMessages = gson.fromJson(messages, DeliveryMessages.class);      if (deliveryMessages != null) {      listener.onSuccess(deliveryMessages);     } else {      listener.onFailure("查詢失敗");     }    }   });  }  } 

package com.yjp.deliverynoquerydemo;  import android.app.ProgressDialog; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.Spinner; import android.widget.Toast;  import com.yjp.deliverynoquerydemo.global.MyApplication; import com.yjp.deliverynoquerydemo.modal.DeliveryMessages; import com.yjp.deliverynoquerydemo.tools.DeliveryMessageGetter;  import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;  import static com.yjp.deliverynoquerydemo.modal.DeliveryMessages.Message;  public class MainActivity extends AppCompatActivity implements DeliveryMessageGetter.DeliveryMessageGetterListener {   private List<Map<String, String>> mQueryData = new ArrayList<>();  private SimpleAdapter mQueryAdapter;   private Spinner mDeliveryCompanySpinner;  private EditText mDeliveryNoEditText;   private ProgressDialog mQueryWaitDialog;   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);    mDeliveryCompanySpinner = (Spinner) findViewById(R.id.delivery_company_spinner);   mDeliveryNoEditText = (EditText) findViewById(R.id.delivery_no_edit_text);   Button queryButton = (Button) findViewById(R.id.query_button);   ListView messagesListView = (ListView) findViewById(R.id.messages_list_view);    queryButton.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {      //沒有輸入快遞單號     if (0 == mDeliveryNoEditText.getText().length()) {      Toast.makeText(MainActivity.this, "請輸入快遞單號", Toast.LENGTH_SHORT).show();      return;     }      //創建ProgressDialog對象     mQueryWaitDialog = new ProgressDialog(MainActivity.this);     mQueryWaitDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);     mQueryWaitDialog.setMessage("正在查詢...");     mQueryWaitDialog.show();      //準備請求參數     int selectedPosition = mDeliveryCompanySpinner.getSelectedItemPosition();     String deliveryCompanyName =       getResources().getStringArray(R.array.delivery_company)[selectedPosition];     Map<String, String> params = new HashMap<>();     params.put("type",       ((MyApplication)getApplication()).getDeliveryCompanyNo(deliveryCompanyName));     params.put("postid", mDeliveryNoEditText.getText().toString());      //清空數據     mQueryData.clear();      //發送請求     DeliveryMessageGetter getter = new DeliveryMessageGetter();     getter.getAsync(getResources().getString(R.string.query_url),       params, MainActivity.this);    }   });    mQueryAdapter = new SimpleAdapter(this,     mQueryData,     R.layout.query_list_item_layout,     new String[] {"time", "context"},     new int[] {R.id.time_text_view, R.id.context_text_view});   messagesListView.setAdapter(mQueryAdapter);  }   @Override  public void onSuccess(DeliveryMessages deliveryMessages) {   List<Message> messages = deliveryMessages.getData();    for (Message message : messages) {    Map<String, String> map = new HashMap<>();    map.put("time", message.getTime());    map.put("context", message.getContext());    mQueryData.add(map);   }    queryComplete("查詢完成");  }   @Override  public void onFailure(String errorStr) {   final String hint = errorStr;   queryComplete("查詢失敗");  }   private void queryComplete(final String toast) {   MainActivity.this.runOnUiThread(new Runnable() {    @Override    public void run() {     mQueryAdapter.notifyDataSetChanged();     mQueryWaitDialog.dismiss();     Toast.makeText(MainActivity.this, toast, Toast.LENGTH_SHORT).show();    }   });  } } 

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"  package="com.yjp.deliverynoquerydemo">   <uses-permission android:name="android.permission.INTERNET" />   <application   android:name=".global.MyApplication"   android:allowBackup="true"   android:icon="@mipmap/ic_launcher"   android:label="@string/app_name"   android:supportsRtl="true"   android:theme="@style/AppTheme">   <activity android:name=".MainActivity"    android:windowSoftInputMode="stateHidden">    <intent-filter>     <action android:name="android.intent.action.MAIN" />      <category android:name="android.intent.category.LAUNCHER" />    </intent-filter>   </activity>  </application>  </manifest>