我将使用一个API在Android中进行天气预报。当我运行程序时，模拟器在代码后崩溃
mService.getAnswers().enqueue(new Callback<SOAnswerResponse>()
因此onResponse或onFailure方法均未执行！ 为什么会这样呢？我为StackOverFlow Questions API的示例使用了相同的代码，并且有效。
LogCat：
08-17 19:29:20.747 6012-6031/? E/AndroidRuntime: FATAL EXCEPTION: OkHttp Dispatcher
Process: com.example.asus.weather, PID: 6012
java.lang.SecurityException: Permission denied (missing INTERNET permission?)
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:119)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
at java.net.InetAddress.getAllByName(InetAddress.java:752)
at okhttp3.Dns$1.lookup(Dns.java:39)
at okhttp3.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:173)
at okhttp3.internal.http.RouteSelector.nextProxy(RouteSelector.java:139)
at okhttp3.internal.http.RouteSelector.next(RouteSelector.java:81)
at okhttp3.internal.http.StreamAllocation.findConnection(StreamAllocation.java:172)
at okhttp3.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:123)
at okhttp3.internal.http.StreamAllocation.newStream(StreamAllocation.java:93)
at okhttp3.internal.http.HttpEngine.connect(HttpEngine.java:296)
at okhttp3.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
at okhttp3.RealCall.getResponse(RealCall.java:243)
at okhttp3.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:201)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:163)
at okhttp3.RealCall.access$100(RealCall.java:30)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:127)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
at libcore.io.Posix.android_getaddrinfo(Native Method)
at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:106)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
at java.net.InetAddress.getAllByName(InetAddress.java:752)
at okhttp3.Dns$1.lookup(Dns.java:39)
at okhttp3.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:173)
at okhttp3.internal.http.RouteSelector.nextProxy(RouteSelector.java:139)
at okhttp3.internal.http.RouteSelector.next(RouteSelector.java:81)
at okhttp3.internal.http.StreamAllocation.findConnection(StreamAllocation.java:172)
at okhttp3.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:123)
at okhttp3.internal.http.StreamAllocation.newStream(StreamAllocation.java:93)
at okhttp3.internal.http.HttpEngine.connect(HttpEngine.java:296)
at okhttp3.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
at okhttp3.RealCall.getResponse(RealCall.java:243)
at okhttp3.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:201)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:163)
at okhttp3.RealCall.access$100(RealCall.java:30)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:127)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: android.system.ErrnoException: android_getaddrinfo failed: EACCES (Permission denied)
at libcore.io.Posix.android_getaddrinfo(Native Method)
at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:106)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
at java.net.InetAddress.getAllByName(InetAddress.java:752)
at okhttp3.Dns$1.lookup(Dns.java:39)
at okhttp3.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:173)
at okhttp3.internal.http.RouteSelector.nextProxy(RouteSelector.java:139)
at okhttp3.internal.http.RouteSelector.next(RouteSelector.java:81)
at okhttp3.internal.http.StreamAllocation.findConnection(StreamAllocation.java:172)
at okhttp3.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:123)
at okhttp3.internal.http.StreamAllocation.newStream(StreamAllocation.java:93)
at okhttp3.internal.http.HttpEngine.connect(HttpEngine.java:296)
at okhttp3.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
at okhttp3.RealCall.getResponse(RealCall.java:243)
at okhttp3.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:201)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:163)
at okhttp3.RealCall.access$100(RealCall.java:30)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:127)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
MainActivity代码：
package com.example.asus.weather;
import android.content.ClipData;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class MainActivity extends AppCompatActivity {
ListView listView;
ArrayList<ClipData.Item> myDataList = new ArrayList<>();
ArrayList<String> myStringList = new ArrayList<>();
DatabaseHandler db = new DatabaseHandler(this);
private SOService mService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.rv_answers);
mService = ApiUtils.getSOService();
loadAnswers();
final ArrayList<String> myDataList = db.getAllWeather();
if (myDataList.size() > 0)
listView.setAdapter(new ArrayAdapter<String>(this, R.layout.list_item, R.id.label, myDataList));
}
public void loadAnswers() {
mService.getAnswers().enqueue(new Callback<SOAnswerResponse>() {
@Override
public void onResponse(Call<SOAnswerResponse> call, Response<SOAnswerResponse> response) {
if (response.isSuccessful()) {
List<Datum_> forcast = response.body().getDaily().getData();
db.addWeather(forcast);
Log.d("Session9", "Posts Loaded from API");
} else {
int statusCode = response.code();
Toast.makeText(getApplicationContext(), response.message(), Toast.LENGTH_LONG).show();
}
}
@Override
public void onFailure(Call<SOAnswerResponse> call, Throwable t) {
}
});
}
}
SOAnswerResponse代码（API数据）：
package com.example.asus.weather;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class SOAnswerResponse {
@SerializedName("latitude")
@Expose
private Double latitude;
@SerializedName("longitude")
@Expose
private Double longitude;
@SerializedName("timezone")
@Expose
private String timezone;
@SerializedName("currently")
@Expose
private Currently currently;
@SerializedName("hourly")
@Expose
private Hourly hourly;
@SerializedName("daily")
@Expose
private Daily daily;
@SerializedName("flags")
@Expose
private Flags flags;
@SerializedName("offset")
@Expose
private Double offset;
public Double getLatitude() {
return latitude;
}
public void setLatitude(Double latitude) {
this.latitude = latitude;
}
public Double getLongitude() {
return longitude;
}
public void setLongitude(Double longitude) {
this.longitude = longitude;
}
public String getTimezone() {
return timezone;
}
public void setTimezone(String timezone) {
this.timezone = timezone;
}
public Currently getCurrently() {
return currently;
}
public void setCurrently(Currently currently) {
this.currently = currently;
}
public Hourly getHourly() {
return hourly;
}
public void setHourly(Hourly hourly) {
this.hourly = hourly;
}
public Daily getDaily() {
return daily;
}
public void setDaily(Daily daily) {
this.daily = daily;
}
public Flags getFlags() {
return flags;
}
public void setFlags(Flags flags) {
this.flags = flags;
}
public Double getOffset() {
return offset;
}
public void setOffset(Double offset) {
this.offset = offset;
}
}
RetrofitClient：
package com.example.asus.weather;
/**
* Created by asus on 8/16/2018.
*/
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
public class RetrofitClient {
private static Retrofit retrofit = null;
public static Retrofit getClient(String baseUrl){
if(retrofit==null){
retrofit = new Retrofit.Builder()
.baseUrl(baseUrl)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
SOService：
package com.example.asus.weather;
/**
* Created by asus on 8/16/2018.
*/
import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;
public interface SOService {
@GET("/forecast/f981283055910310969577c70c37a302/35.69439,51.42151")
Call<SOAnswerResponse> getAnswers();
@GET("/forecast/f981283055910310969577c70c37a302/35.69439,51.42151")
Call<SOAnswerResponse> getAnswers(@Query("tagged") String tags);
}
ApiUtils：
package com.example.asus.weather;
import retrofit2.Retrofit;
/**
* Created by asus on 8/16/2018.
*/
public class ApiUtils {
public static final String BASE_URL = "https://api.darksky.net";
public static SOService getSOService(){
return RetrofitClient.getClient(BASE_URL).create(SOService.class);
}
}
答案 0 :(得分：0)
我不熟悉logcat。查看logCat后，我发现清单中没有使用Internet权限。