java.net.SocketException:套接字失败: EACCES (权限拒绝)没有通过使用解决-权限
java.net.SocketException:套接字失败: EACCES (权限拒绝)没有通过使用解决-权限
提问于 2016-11-23 15:09:09
我刚开始学习Android，我正在尝试从UDP客户端成功地发送一个字符串。
我使用PacketSender作为服务器，但到目前为止我还没有得到，因为我的权限被拒绝了。
以下是代码：
public class UDPStringSender extends AppCompatActivity {
Intent intent;
String ipAddress, port;
int portNumber;
boolean shouldLog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_udp_string_sender);
intent = getIntent();
ipAddress = intent.getStringExtra("ip");
port = intent.getStringExtra("port");
portNumber = Integer.parseInt(port);
Log.d("IP number is", ipAddress);
Log.d("Port number is", port);
shouldLog = true;
}
public void sendString(View view) {
EditText stringField = (EditText)findViewById(R.id.sendableString);
String sendableString = stringField.getText().toString();
DatagramSocket _datagramSocket = null;
try {
_datagramSocket = new DatagramSocket();
InetAddress serverIP = InetAddress.getByName(ipAddress);
if(shouldLog)
Log.d("InetAddress is", serverIP.toString());
DatagramPacket _datagramPacket = new DatagramPacket(sendableString.getBytes(), sendableString.length(), serverIP, portNumber);
if(shouldLog)
Log.d("Packet to be send", _datagramPacket.toString());
_datagramSocket.send(_datagramPacket);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
if(_datagramSocket != null) {
_datagramSocket.close();
if(shouldLog)
Log.d("is datagramSockedClosed", String.valueOf(_datagramSocket.isClosed()));
}
}
}}
我的机器人清单：
<?xml version="1.0" encoding="utf-8"?>
<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.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<activity android:name=".Interface">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".UDPStringSender">
</activity>
</application>
还有我的逻辑猫：
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: java.net.SocketException: socket failed: EACCES (Permission denied)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at libcore.io.IoBridge.socket(IoBridge.java:619)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at java.net.PlainDatagramSocketImpl.create(PlainDatagramSocketImpl.java:93)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at java.net.DatagramSocket.createSocket(DatagramSocket.java:157)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at java.net.DatagramSocket.<init>(DatagramSocket.java:80)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at java.net.DatagramSocket.<init>(DatagramSocket.java:65)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at co.barakastudio.layouttest.UDPStringSender.sendString(UDPStringSender.java:48)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at java.lang.reflect.Method.invoke(Native Method)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at android.view.View.performClick(View.java:5697)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at android.widget.TextView.performClick(TextView.java:10826)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at android.view.View$PerformClick.run(View.java:22526)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at android.os.Handler.handleCallback(Handler.java:739)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at android.os.Looper.loop(Looper.java:158)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at android.app.ActivityThread.main(ActivityThread.java:7225)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at java.lang.reflect.Method.invoke(Native Method)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: Caused by: android.system.ErrnoException: socket failed: EACCES (Permission denied)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at libcore.io.Posix.socket(Native Method)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at libcore.io.BlockGuardOs.socket(BlockGuardOs.java:282)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: at libcore.io.IoBridge.socket(IoBridge.java:604)
11-23 15:58:50.652 31936-31936/co.barakastudio.layouttest W/System.err: ... 17 more我真的很感激你的时间，因为这将节省我的很多钱:)干杯，
Stack Overflow用户
回答已采纳
发布于 2016-11-23 15:14:14
引用我自己
<uses-permission>元素应该在<manifest>元素中，但在<application>元素之外。换句话说，这是很好的：
<?xml version="1.0" encoding="utf-8"?>
<manifest
package="com.commonsware.android.something.something"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="INTERNET"/>
<uses-permission android:name="ACCESS_NETWORK_STATE"/>
<application
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<!-- cool stuff goes here -->
</application>
</manifest>但这并不是：
<?xml version="1.0" encoding="utf-8"?>
<manifest
package="com.commonsware.android.something.something"
xmlns:android="http://schemas.android.com/apk/res/android">
<application
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<uses-permission android:name="INTERNET"/>
<uses-permission android:name="ACCESS_NETWORK_STATE"/>
<!-- cool stuff goes here -->
</application>
</manifest>如果手动分析清单(分析>检查代码)，Android会报告这一点.从主菜单)，它不会自动显示一个警告，仅仅是在错误的位置上的元素。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40767958
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