Question

我正在尝试使用我的Android应用程序在mysql数据库中存储一些数据。我使用okhttp3发送请求，但在这一行显示错误：

client.newCall(request).execute();

我在本地机器和网上尝试了它，但它给了我同样的错误，这是代码，

public class MainActivity extends AppCompatActivity {

    String token1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        System.out.println("MainActivity is :" + FirebaseInstanceId.getInstance().getToken());
        FirebaseMessaging.getInstance().subscribeToTopic("test");
        FirebaseInstanceId.getInstance().getToken();
        token1=FirebaseInstanceId.getInstance().getToken();
    }

    public void clicking(View view) {

        OkHttpClient client = new OkHttpClient();
        RequestBody body = new FormBody.Builder()
                .add("Token",token1)
                .build();

        okhttp3.Request request = new okhttp3.Request.Builder()
                .url("http://saleh923.byethost8.com/hii.html")
                .post(body)
                .build();

        try {
            client.newCall(request).execute();
        } catch (IOException e) {

            e.printStackTrace();
        }
    }
}

这是日志：

 com.example.user.firebasenot E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.user.firebasenot, PID: 3280
    java.lang.IllegalStateException: Could not execute method for android:onClick
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
        at android.view.View.performClick(View.java:5198)
        at android.view.View$PerformClick.run(View.java:21147)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5417)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
     Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Method.invoke(Native Method)
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
        at android.view.View.performClick(View.java:5198) 
        at android.view.View$PerformClick.run(View.java:21147) 
        at android.os.Handler.handleCallback(Handler.java:739) 
        at android.os.Handler.dispatchMessage(Handler.java:95) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:5417) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
     Caused by: android.os.NetworkOnMainThreadException
        at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273)
        at java.net.InetAddress.lookupHostByName(InetAddress.java:431)
        at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
        at java.net.InetAddress.getAllByName(InetAddress.java:215)
        at okhttp3.Dns$1.lookup(Dns.java:39)
        at okhttp3.internal.connection.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:172)
        at okhttp3.internal.connection.RouteSelector.nextProxy(RouteSelector.java:138)
        at okhttp3.internal.connection.RouteSelector.next(RouteSelector.java:80)
        at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:178)
        at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:129)
        at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:98)
        at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
        at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:109)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
        at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
        at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:124)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
        at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:170)
        at okhttp3.RealCall.execute(RealCall.java:60)
        at com.example.user.firebasenot.MainActivity.clicking(MainActivity.java:54)
        at java.lang.reflect.Method.invoke(Native Method) 
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
        at android.view.View.performClick(View.java:5198) 
        at android.view.View$PerformClick.run(View.java:21147) 
        at android.os.Handler.handleCallback(Handler.java:739) 
        at android.os.Handler.dispatchMessage(Handler.java:95) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:5417) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

错误消息说明了一切：

引起：android.os.NetworkOnMainThreadException

您不应该在主（也称为UI）线程上发出网络请求您可以通过多种方式在不同的主题上发出此请求，其中包括：

final OkHttpClient client = new OkHttpClient();
RequestBody body = new FormBody.Builder()
        .add("Token",token1)
        .build();

final okhttp3.Request request = new okhttp3.Request.Builder()
        .url("http://saleh923.byethost8.com/hii.html")
        .post(body)
        .build();

final Thread thread = new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            client.newCall(request).execute();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
});

但okhttp使我们更容易使用enqueue method发出异步请求：

client.newCall(request).enqueue(new Callback() {
    @Override
    public void onFailure(Call call, IOException e) {
        e.printStackTrace();
    }

    @Override
    public void onResponse(Call call, final Response response) throws IOException {
        if (!response.isSuccessful()) {
            throw new IOException("Unexpected code " + response);
        }

        // you code to handle response
    }
);

Answer 2

以下是调试代码的方法：您在日志中的第一个提示，

java.lang.IllegalStateException：无法执行方法机器人：的onClick

告诉你onClick方法实现有问题，在这种情况下是clicking(View view)。然后，您继续寻找下一个提示，这是您在日志中的第二个提示，

引起：android.os.NetworkOnMainThreadException

这肯定发生在您指出的clicking(View view)方法实现行中。它正在从主线程发出网络请求;哦，哦，Android系统认为这是一件坏事。

那么出路是什么？您可以使用以下任何替代方法：

备选方案1：View.post（Runnable）或View.postDelayed（Runnable，long）

备选方案2：Activity.runOnUiThread（Runnable）

备选方案3：处理程序

备选方案4：AsyncTask

我已经演示了这些替代品中的每一种，包括你在我的Github项目中展示的错误方式DemoThreadsAndProcesses。请随意（分叉）下载并使用它来查看哪种实现方案适合您的兴趣，并在您自己的项目中使用它。

为了快速检查，我将开始实施您的clicking(View view)，如下所示：

public void clicking(View view) {
   new MakeNetworkRequestAsyncTask().execute();
}

private void makeNetworkRequest() {
    OkHttpClient client = new OkHttpClient();
        RequestBody body = new FormBody.Builder()
                .add("Token",token1)
                .build();

        okhttp3.Request request = new okhttp3.Request.Builder()
                .url("http://saleh923.byethost8.com/hii.html")
                .post(body)
                .build();

        try {
            client.newCall(request).execute();
        } catch (IOException e) {
            e.printStackTrace();
        }
}

private class MakeNetworkRequestAsyncTask extends AsyncTask<Void, Void, Void> {
   // The system calls this to perform work in a worker thread and
   // delivers it the parameters given to AsyncTask.execute()
   protected transient Void doInBackground(Void[] params) {
      makeNetworkRequest();
   }

   // The system calls this to perform work in the UI thread and
   // delivers the result from doInBackground() method defined above
   @Override
   protected void onPostExecute(Void result) {}
}

希望有所帮助！

android OkHttpClient请求错误

2 个答案: