Question

我想编写一个非常简单的API。当我使用邮递员API的作品。我想创建android应用，但是我的应用崩溃了。为什么？错误在哪里

OkHttpClient zapytanie = new OkHttpClient();
                RequestBody requestBody = new FormBody.Builder()
                        .add("login", "some_email")
                        .add("password", "some_password")
                        .build();
                final Request request = new Request.Builder()
                        .header("Content-Type", "application/x-www-form-urlencoded")
                        .url("https://garlic-dragon.000webhostapp.com/registration.php")
                        .post(requestBody)
                        .build();
                try {
                    Response response = zapytanie.newCall(request).execute();
                    Toast.makeText(getApplicationContext(), "This is my success!",
                            Toast.LENGTH_LONG).show();
                } catch (IOException e) {
                    //e.printStackTrace();
                    Toast.makeText(getApplicationContext(), e.toString(),
                            Toast.LENGTH_LONG).show();
                }

2019-12-07 19：32：56.007 28055-28055 / com.example.chat E / AndroidRuntime：致命异常：主要流程：com.example.chat，PID：28055 android.os.NetworkOnMainThreadException 在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork（StrictMode.java:1513）在java.net.Inet6AddressImpl.lookupHostByName（Inet6AddressImpl.java:117）在java.net.Inet6AddressImpl.lookupAllHostAddr（Inet6AddressImpl.java:105）在java.net.InetAddress.getAllByName（InetAddress.java:1154）在okhttp3.Dns $ Companion $ SYSTEM $ 1.lookup（Dns.kt：48）在okhttp3.internal.connection.RouteSelector.resetNextInetSocketAddress（RouteSelector.kt：160）在okhttp3.internal.connection.RouteSelector.nextProxy（RouteSelector.kt：125）在okhttp3.internal.connection.RouteSelector.next（RouteSelector.kt：71）在okhttp3.internal.connection.ExchangeFinder.findConnection（ExchangeFinder.kt：199）在okhttp3.internal.connection.ExchangeFinder.findHealthyConnection（ExchangeFinder.kt：109）在okhttp3.internal.connection.ExchangeFinder.find（ExchangeFinder.kt：77）在okhttp3.internal.connection.Transmitter.newExchange $ okhttp（Transmitter.kt：162）在okhttp3.internal.connection.ConnectInterceptor.intercept（ConnectInterceptor.kt：35）在okhttp3.internal.http.RealInterceptorChain.proceed（RealInterceptorChain.kt：112）在okhttp3.internal.http.RealInterceptorChain.proceed（RealInterceptorChain.kt：87）在okhttp3.internal.cache.CacheInterceptor.intercept（CacheInterceptor.kt：82）在okhttp3.internal.http.RealInterceptorChain.proceed（RealInterceptorChain.kt：112）在okhttp3.internal.http.RealInterceptorChain.proceed（RealInterceptorChain.kt：87）在okhttp3.internal.http.BridgeInterceptor.intercept（BridgeInterceptor.kt：84）在okhttp3.internal.http.RealInterceptorChain.proceed（RealInterceptorChain.kt：112）在okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept（RetryAndFollowUpInterceptor.kt：71）在okhttp3.internal.http.RealInterceptorChain.proceed（RealInterceptorChain.kt：112）在okhttp3.internal.http.RealInterceptorChain.proceed（RealInterceptorChain.kt：87）在okhttp3.RealCall.getResponseWithInterceptorChain（RealCall.kt：184）在okhttp3.RealCall.execute（RealCall.kt：66）在com.example.a4.MainActivity $ 2.onClick（MainActivity.java:78）在android.view.View.performClick（View.java:7339）在android.widget.TextView.performClick（TextView.java:14222）在android.view.View.performClickInternal（View.java:7305）在android.view.View.access $ 3200（View.java:846）在android.view.View $ PerformClick.run（View.java:27787）在android.os.Handler.handleCallback（Handler.java:873）在android.os.Handler.dispatchMessage（Handler.java:99）在android.os.Looper.loop（Looper.java:214）在android.app.ActivityThread.main（ActivityThread.java:7078）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:493）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:964）

Answer 1

错误必须为NetworkOnMainThreadException，这是因为无法在主线程上执行同步HTTP。使用入队不执行异步运行请求。

     OkHttpClient zapytanie = new OkHttpClient();
     RequestBody requestBody = new FormBody.Builder()
                          .add("login", "some_email")
                          .add("password", "some_password")
                          .build();
     final Request request = new Request.Builder()
                          .header("Content-Type", "application/x-www-form-urlencoded")
                          .url("https://garlic-dragon.000webhostapp.com/registration.php")
                          .post(requestBody)
                          .build();
     try {
          Response response = zapytanie.newCall(request).enqueue(new Callback() {
          @Override
            public void onFailure(Request request, Throwable throwable) {
             // Something went wrong
            }

            @Override public void onResponse(Response response) throws IOException {
                 if (response.isSuccessful()) {
                  // Do what you want to do with the response.
                 } else {
                  // Request not successful
                 }
            }
           });
     } catch (IOException e) {
          //e.printStackTrace();
          Toast.makeText(getApplicationContext(), e.toString(),
           Toast.LENGTH_LONG).show();
     }

我建议使用Retrofit之类的库，以简化API调用。

JAVA与服务器php通信

1 个答案: