通过JSON将Android App连接到PHP服务器：套接字异常

Question

我正在尝试接收JSON对象，并将内容放入ArrayList中。 我们设置的PHP服务器显示该应用程序正在与服务器联系，但没有任何回传。 我没有收到任何致命错误，但是我遇到了套接字错误：权限被拒绝。

 D/NetworkSecurityConfig: No Network Security Config specified, using platform default I/System.out: (HTTPLog)-Static: isSBSettingEnabled false I/System.out: (HTTPLog)-Static: isSBSettingEnabled false W/System.err: java.net.SocketException: Permission denied W/System.err: at java.net.Socket.createImpl(Socket.java:454) W/System.err: at java.net.Socket.getImpl(Socket.java:517) W/System.err: at java.net.Socket.setSoTimeout(Socket.java:1108) W/System.err: at com.android.okhttp.Connection.connectSocket(Connection.java:1454) W/System.err: at com.android.okhttp.Connection.connect(Connection.java:1413) W/System.err: at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:1707) W/System.err: at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:133) W/System.err: at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:466) W/System.err: at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:371) W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:503) W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:438) W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:247) W/System.err: at java.net.URLConnection.getContent(URLConnection.java:737) W/System.err: at com.example.steve.plantpals.receiveData.receivePlantList(receiveData.java:41) W/System.err: at com.example.steve.plantpals.UserActivity$1.onClick(UserActivity.java:38) W/System.err: at android.view.View.performClick(View.java:6205) W/System.err: at android.widget.TextView.performClick(TextView.java:11103) W/System.err: at android.view.View$PerformClick.run(View.java:23653) W/System.err: at android.os.Handler.handleCallback(Handler.java:751) W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95) W/System.err: at android.os.Looper.loop(Looper.java:154) W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6682) W/System.err: at java.lang.reflect.Method.invoke(Native Method) W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410) W/System.err: java.net.SocketException: Permission denied W/System.err: at java.net.Socket.createImpl(Socket.java:454) W/System.err: at java.net.Socket.getImpl(Socket.java:517) W/System.err: at java.net.Socket.setSoTimeout(Socket.java:1108) W/System.err: at com.android.okhttp.Connection.connectSocket(Connection.java:1454) W/System.err: at com.android.okhttp.Connection.connect(Connection.java:1413) W/System.err: at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:1707) W/System.err: at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:133) W/System.err: at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:466) W/System.err: at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:371) W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:503) W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:438) W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:247) W/System.err: at java.net.URLConnection.getContent(URLConnection.java:737) W/System.err: at com.example.steve.plantpals.receiveData.receivePlantList(receiveData.java:41) W/System.err: at com.example.steve.plantpals.UserActivity$1.onClick(UserActivity.java:38) W/System.err: at android.view.View.performClick(View.java:6205) W/System.err: at android.widget.TextView.performClick(TextView.java:11103) W/System.err: at android.view.View$PerformClick.run(View.java:23653) W/System.err: at android.os.Handler.handleCallback(Handler.java:751) W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95) W/System.err: at android.os.Looper.loop(Looper.java:154) W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6682) W/System.err: at java.lang.reflect.Method.invoke(Native Method) W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410) 

这是我打电话接收数据的地方：

 public class receiveData { int moisture = LocalStorage.moisture; User user; ArrayList<Plant> receivedPlants = new ArrayList<Plant>(); URL url = new URL("http://192.168.0.14/steve.php"); URLConnection urlConnection = (HttpURLConnection) url.openConnection(); public receiveData() throws IOException { } public ArrayList<Plant> receivePlantList() { // HTTP request urlConnection.setDoOutput(true); try { urlConnection.getContent(); } catch (IOException e) { e.printStackTrace(); } // Get items from JSON object and place in a plant list BufferedReader reader = null; try { InputStream stream = urlConnection.getInputStream(); reader = new BufferedReader(new InputStreamReader(stream)); JsonReader jReader = new JsonReader(reader); jReader.beginObject(); while (jReader.hasNext()) { jReader.nextName(); int plantMoisture = jReader.nextInt(); String plantName = jReader.nextString(); Plant currentPlant = new Plant(plantName, plantMoisture); receivedPlants.add(currentPlant); } jReader.endObject(); reader.close(); stream.close(); } catch (IOException e) { e.printStackTrace(); } //jReader.close(); return receivedPlants; } 

这是我的Android清单：

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.steve.plantpals"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.INTERNET" /> <activity android:name=".MainActivity" android:label="@string/app_name" android:theme="@style/AppTheme.NoActionBar"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".MyPlants" android:label="@string/title_activity_my_plants" android:theme="@style/AppTheme.NoActionBar" /> <activity android:name=".AddPlant" /> <activity android:name=".testMoistureHigh" /> <activity android:name=".testMoistureLow" /> <activity android:name=".testMoistureOptimal" /> <activity android:name=".SettingsActivity" android:label="@string/title_activity_settings" /> <activity android:name=".UserActivity"></activity> </application> </manifest> 

这是我的第一个需要联网的项目，也是我的第一个stackoverflow问题，如果不清楚，请您抱歉。

Answer 1

您必须在应用程序标记之外声明权限

  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
  <uses-permission android:name="android.permission.INTERNET" />

   <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    ...