我尝试使用 Retrofit 库在 Android 上使用 API 未成功，但在使用 POSTMAN 时，我可以看到预期的结果。
postman 设置
api url (base+controller)
HTTP 方法设置为 POST
点击了 from-data 或 x-www-form-urlencoded
然后我在键/值字段上传递两个参数。
安卓改造设置
@POST("/GetDetailWithMonthWithCode") void getLandingPageReport(@Query("code") String code, @Query("monthact") String monthact, Callback<LandingPageReport> cb); @FormUrlEncoded @POST("/GetDetailWithMonthWithCode") void getLandingPageReport(@Field("code") String code, @Field("monthact") String monthact, Callback<LandingPageReport> cb); 这些选项都不起作用。但结果是 {}。
更新
使用标准 HttpClient 进行相同设置(和 HttpPost )类工作正常。
HttpClient client = new DefaultHttpClient(); HttpPost post = new HttpPost(url); List<NameValuePair> urlParameters = new ArrayList<NameValuePair>(); urlParameters.add(new BasicNameValuePair("code", "testcode")); urlParameters.add(new BasicNameValuePair("monthact", "feb-2015")); post.setEntity(new UrlEncodedFormEntity(urlParameters)); HttpResponse response = client.execute(post); 为什么我不能执行这个请求并在 Retrofit 中得到正确的响应？
更新 2
@POST("/GetDetailWithMonthWithCode") void getLandingPageReport(@Query("code") String code, @Query("monthact") String monthact, Callback<List<LandingPageReport>> cb); @FormUrlEncoded @POST("/GetDetailWithMonthWithCode") void getLandingPageReport(@Field("code") String code, @Field("monthact") String monthact, Callback<List<LandingPageReport>>> cb); 玩了一圈之后，我想我找到了问题的根源。我已更新我的 retrofit 代码以接收 List<LandingPageReport> .但是现在出现这个错误
retrofit.RetrofitError: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $
原因是我消耗了 2 个 api(webapi 和 wcf)。我所有的其他json响应是对象数组。 [{},{}] 但在这次通话中我收到了这个
{ "GetDetailWithMonthWithCodeResult": [ { "code": "test", "field1": "test", } ] } 但我仍然无法解析响应。
请您参考如下方法:
compile 'com.google.code.gson:gson:2.6.2' compile 'com.squareup.retrofit2:retrofit:2.1.0'// compulsory compile 'com.squareup.retrofit2:converter-gson:2.1.0' //for retrofit conversion 登录API放两个参数
{ "UserId": "1234", "Password":"1234" } 登录响应
{ "UserId": "1234", "FirstName": "Keshav", "LastName": "Gera", "ProfilePicture": "312.113.221.1/GEOMVCAPI/Files/1.500534651736E12p.jpg" } APIClient.java
import retrofit2.Retrofit; import retrofit2.converter.gson.GsonConverterFactory; class APIClient { public static final String BASE_URL = "Your Base Url "; private static Retrofit retrofit = null; public static Retrofit getClient() { if (retrofit == null) { retrofit = new Retrofit.Builder() .baseUrl(BASE_URL) .addConverterFactory(GsonConverterFactory.create()) .build(); } return retrofit; } } APIInterface接口(interface)
interface APIInterface { @POST("LoginController/Login") Call<LoginResponse> createUser(@Body LoginResponse login); } 登录Pojo
package pojos; import com.google.gson.annotations.SerializedName; public class LoginResponse { @SerializedName("UserId") public String UserId; @SerializedName("FirstName") public String FirstName; @SerializedName("LastName") public String LastName; @SerializedName("ProfilePicture") public String ProfilePicture; @SerializedName("Password") public String Password; @SerializedName("ResponseCode") public String ResponseCode; @SerializedName("ResponseMessage") public String ResponseMessage; public LoginResponse(String UserId, String Password) { this.UserId = UserId; this.Password = Password; } public String getUserId() { return UserId; } public String getFirstName() { return FirstName; } public String getLastName() { return LastName; } public String getProfilePicture() { return ProfilePicture; } public String getResponseCode() { return ResponseCode; } public String getResponseMessage() { return ResponseMessage; } } MainActivity
package com.keshav.retrofitloginexampleworkingkeshav; import android.app.Dialog; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import pojos.LoginResponse; import retrofit2.Call; import retrofit2.Callback; import retrofit2.Response; import utilites.CommonMethod; public class MainActivity extends AppCompatActivity { TextView responseText; APIInterface apiInterface; Button loginSub; EditText et_Email; EditText et_Pass; private Dialog mDialog; String userId; String password; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); apiInterface = APIClient.getClient().create(APIInterface.class); loginSub = (Button) findViewById(R.id.loginSub); et_Email = (EditText) findViewById(R.id.edtEmail); et_Pass = (EditText) findViewById(R.id.edtPass); loginSub.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (checkValidation()) { if (CommonMethod.isNetworkAvailable(MainActivity.this)) loginRetrofit2Api(userId, password); else CommonMethod.showAlert("Internet Connectivity Failure", MainActivity.this); } } }); } private void loginRetrofit2Api(String userId, String password) { final LoginResponse login = new LoginResponse(userId, password); Call<LoginResponse> call1 = apiInterface.createUser(login); call1.enqueue(new Callback<LoginResponse>() { @Override public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) { LoginResponse loginResponse = response.body(); Log.e("keshav", "loginResponse 1 --> " + loginResponse); if (loginResponse != null) { Log.e("keshav", "getUserId --> " + loginResponse.getUserId()); Log.e("keshav", "getFirstName --> " + loginResponse.getFirstName()); Log.e("keshav", "getLastName --> " + loginResponse.getLastName()); Log.e("keshav", "getProfilePicture --> " + loginResponse.getProfilePicture()); String responseCode = loginResponse.getResponseCode(); Log.e("keshav", "getResponseCode --> " + loginResponse.getResponseCode()); Log.e("keshav", "getResponseMessage --> " + loginResponse.getResponseMessage()); if (responseCode != null && responseCode.equals("404")) { Toast.makeText(MainActivity.this, "Invalid Login Details \n Please try again", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(MainActivity.this, "Welcome " + loginResponse.getFirstName(), Toast.LENGTH_SHORT).show(); } } } @Override public void onFailure(Call<LoginResponse> call, Throwable t) { Toast.makeText(getApplicationContext(), "onFailure called ", Toast.LENGTH_SHORT).show(); call.cancel(); } }); } public boolean checkValidation() { userId = et_Email.getText().toString(); password = et_Pass.getText().toString(); Log.e("Keshav", "userId is -> " + userId); Log.e("Keshav", "password is -> " + password); if (et_Email.getText().toString().trim().equals("")) { CommonMethod.showAlert("UserId Cannot be left blank", MainActivity.this); return false; } else if (et_Pass.getText().toString().trim().equals("")) { CommonMethod.showAlert("password Cannot be left blank", MainActivity.this); return false; } return true; } } CommonMethod.java
public class CommonMethod { public static final String DISPLAY_MESSAGE_ACTION = "com.codecube.broking.gcm"; public static final String EXTRA_MESSAGE = "message"; public static boolean isNetworkAvailable(Context ctx) { ConnectivityManager connectivityManager = (ConnectivityManager)ctx.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo(); return activeNetworkInfo != null && activeNetworkInfo.isConnected(); } public static void showAlert(String message, Activity context) { final AlertDialog.Builder builder = new AlertDialog.Builder(context); builder.setMessage(message).setCancelable(false) .setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { } }); try { builder.show(); } catch (Exception e) { e.printStackTrace(); } } } activity_main.xml
<LinearLayout android:layout_width="wrap_content" android:layout_height="match_parent" android:focusable="true" android:focusableInTouchMode="true" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android"> <ImageView android:id="@+id/imgLogin" android:layout_width="200dp" android:layout_height="150dp" android:layout_gravity="center" android:layout_marginTop="20dp" android:padding="5dp" android:background="@mipmap/ic_launcher_round" /> <TextView android:id="@+id/txtLogo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/imgLogin" android:layout_centerHorizontal="true" android:text="Holostik Track and Trace" android:textSize="20dp" android:visibility="gone" /> <android.support.design.widget.TextInputLayout android:id="@+id/textInputLayout1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginLeft="@dimen/box_layout_margin_left" android:layout_marginRight="@dimen/box_layout_margin_right" android:layout_marginTop="8dp" android:padding="@dimen/text_input_padding"> <EditText android:id="@+id/edtEmail" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:ems="10" android:fontFamily="sans-serif" android:gravity="top" android:hint="Login ID" android:maxLines="10" android:paddingLeft="@dimen/edit_input_padding" android:paddingRight="@dimen/edit_input_padding" android:paddingTop="@dimen/edit_input_padding" android:singleLine="true"></EditText> </android.support.design.widget.TextInputLayout> <android.support.design.widget.TextInputLayout android:id="@+id/textInputLayout2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@+id/textInputLayout1" android:layout_marginLeft="@dimen/box_layout_margin_left" android:layout_marginRight="@dimen/box_layout_margin_right" android:padding="@dimen/text_input_padding"> <EditText android:id="@+id/edtPass" android:layout_width="match_parent" android:layout_height="wrap_content" android:focusable="true" android:fontFamily="sans-serif" android:hint="Password" android:inputType="textPassword" android:singleLine="true" /> </android.support.design.widget.TextInputLayout> <RelativeLayout android:id="@+id/rel12" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textInputLayout2" android:layout_marginTop="10dp" android:layout_marginLeft="10dp" > <Button android:id="@+id/loginSub" android:layout_width="wrap_content" android:layout_height="45dp" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:background="@drawable/border_button" android:paddingLeft="30dp" android:paddingRight="30dp" android:layout_marginRight="10dp" android:text="Login" android:textColor="#ffffff" /> </RelativeLayout> </LinearLayout> 