Android - Retrofit 2 Fehler: "HTTP-Methode Annotation ist erforderlich"

Question

Es gibt einige Fragen dazu, aber nichts scheint zu funktionieren. Ich versuche, den Inhalt einer Webseite in Form eines Json-Objekts zu erhalten.

hinzugefügt, dies zu proguard-rules.pro:

<pre><code>-keepattributes *Annotation* 
-keep class retrofit.** { *; } 
-keepclasseswithmembers class * { 
@retrofit.http.* <methods>; } 
-keepattributes Signature 

-keep class com.google.gson.** { *; } 
-keep class com.google.inject.** { *; } 
-keep class org.apache.http.** { *; } 
-keep class org.apache.james.mime4j.** { *; } 
-keep class javax.inject.** { *; } 
-keep class retrofit.** { *; } </pre></code> 

Mein build.gradle:

<pre><code> apply plugin: 'com.android.application' 
apply plugin: 'realm-android' 

android { 
    packagingOptions { 
     exclude 'META-INF/LICENSE.txt' 
     exclude 'META-INF/NOTICE.txt' 
    } 
    compileSdkVersion 23 
    buildToolsVersion "23.0.3" 
    useLibrary 'org.apache.http.legacy' 

    defaultConfig { 
     applicationId "com.myApplication" 
     minSdkVersion 19 
     targetSdkVersion 23 
     versionCode 1 
     versionName "1.0" 
    } 
} 

dependencies { 
    compile fileTree(include: ['*.jar'], dir: 'libs') 
    testCompile 'junit:junit:4.12' 
    compile 'com.android.support:appcompat-v7:24.0.0-alpha1' 
    compile 'com.android.support:design:24.0.0-alpha1' 
    compile 'com.android.support:support-v4:24.0.0-alpha1' 
    compile 'com.google.android.gms:play-services-maps:8.4.0' 
    compile 'com.google.android.gms:play-services-appindexing:8.4.0' 
    compile 'org.apache.commons:commons-lang3:3.4' 
    compile 'com.squareup.okhttp3:okhttp:3.2.0' 
    compile 'com.squareup.retrofit2:retrofit:2.0.2' 
    compile 'com.google.code.gson:gson:2.4' 
    compile 'org.glassfish:javax.annotation:10.0-b28' 
}</pre></code> 

Schnittstelle:

<pre><code> public interface LoginInterface { 

    @GET("?email=myEmail@gmailcom&password=opensesame") 
     Boolean getData(Callback<LoginJsonParser> cb); 
}</pre></code> 

LoginJsonParser class: 

<pre><code> import javax.annotation.Generated; 

import com.google.gson.annotations.Expose; 
import com.google.gson.annotations.SerializedName; 

@Generated("org.jsonschema2pojo") 
public class LoginJsonParser { 

    @SerializedName("success") 
    @Expose 
    private Integer success; 

    @SerializedName("message") 
    @Expose 
    private String message; 

    /** 
    * 
    * @return The success 
    */ 
    public Integer getSuccess() { 
     return success; 
    } 

    /** 
    * 
    * @param success The success 
    */ 
    public void setSuccess(Integer success) { 
     this.success = success; 
    } 

    /** 
    * 
    * @return The message 
    */ 
    public String getMessage() { 
     return message; 
    } 

    /** 
    * 
    * @param message The message 
    */ 
    public void setMessage(String message) { 
     this.message = message; 
    } 

}</pre></code> 

Dies ist der Fehler:

<pre><code>java.lang.RuntimeException: An error occurred while executing doInBackground() 
at android.os.AsyncTask$3.done(AsyncTask.java:309) 
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354) 
at java.util.concurrent.FutureTask.setException(FutureTask.java:223) 
at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
at java.lang.Thread.run(Thread.java:818) 
Caused by: retrofit.RetrofitError: LoginInterface.isLoginValid: HTTP method annotation is required (e.g., @GET, @POST, etc.). 
at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:400) 
at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240) 
at java.lang.reflect.Proxy.invoke(Proxy.java:393) 
at $Proxy0.isLoginValid(Unknown Source) 
at com.myApplication.activity.Login$UserLoginTask.doInBackground(Login.java:344) 
at com.myApplication.activity.Login$UserLoginTask.doInBackground(Login.java:318) 
at android.os.AsyncTask$2.call(AsyncTask.java:295) 
at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)  
at java.lang.Thread.run(Thread.java:818)  
Caused by: java.lang.IllegalArgumentException: LoginInterface.isLoginValid: HTTP method annotation is required (e.g., @GET, @POST, etc.). 
at retrofit.RestMethodInfo.methodError(RestMethodInfo.java:107) 
at retrofit.RestMethodInfo.parseMethodAnnotations(RestMethodInfo.java:179) 
at retrofit.RestMethodInfo.init(RestMethodInfo.java:117) 
at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:294) 
at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240)  
at java.lang.reflect.Proxy.invoke(Proxy.java:393)  
at $Proxy0.isLoginValid(Unknown Source)  
at com.myApplication.activity.Login$UserLoginTask.doInBackground(Login.java:344)  
at com.myApplication.activity.Login$UserLoginTask.doInBackground(Login.java:318)  
at android.os.AsyncTask$2.call(AsyncTask.java:295)  
at java.util.concurrent.FutureTask.run(FutureTask.java:237)  
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)  
at java.lang.Thread.run(Thread.java:818) </code></pre> 

Answer 1

Verwenden des falschen "@GET".

Ich hatte zunächst das gleiche Problem. Ein sehr häufiger Fehler beim Wechsel von Retrofit1 zu Retrofit2. Stellen Sie in der Schnittstelle sicher, dass Sie die richtige Importanweisung für GET verwenden. Ich war mir nicht bewusst, dass ich @GET von Retrofit.http und nicht @GET von Retrofit2.http, die Anmerkung von Retrofit.http zu Retrofit2.http wird die Arbeit tun.