Question

当我通过命令wifiManager.getIpAddress()获取IP地址时，应用程序将关闭。有人能告诉我原因吗？当我使用底部的方法时，我获得了所需的IP地址，但在相同的代码中，当我尝试直接显示IP地址时，它给了我一个错误

编辑 -

package com.example.socketserverclient;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity{

    final Context context = this;
    WifiManager wifi;
    TextView ipAddress, BSSID;
    Button getIP;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

//      String IpAddress = getLocalIpAddress();
        ipAddress = (TextView) findViewById(R.id.textIpAddress);
        BSSID = (TextView) findViewById(R.id.textBSSID);
        getIP = (Button) findViewById (R.id.button);
//      ipAddress.setText(IpAddress);
        getIP.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View arg0) {
                String IpAddress = getLocalIpAddress();
//              ipAddress.setText(IpAddress);
            }

        });
    }
    private String getLocalIpAddress() {

        WifiManager myWifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);

        WifiInfo myWifiInfo = myWifiManager.getConnectionInfo();
        //gets the Ip address in hex form, We need to convert it to integer and then finally to string to display it 

        int myIp = myWifiInfo.getIpAddress(); 
        BSSID.setText(myIp);
        int intMyIp3 = myIp/0x1000000;
        int intMyIp3mod = myIp%0x1000000;

        int intMyIp2 = intMyIp3mod/0x10000;
        int intMyIp2mod = intMyIp3mod%0x10000;

        int intMyIp1 = intMyIp2mod/0x100;
        int intMyIp0 = intMyIp2mod%0x100;

        ipAddress.setText(String.valueOf(intMyIp0) + "." + String.valueOf(intMyIp1)
                            + "." + String.valueOf(intMyIp2)
                            + "." + String.valueOf(intMyIp3)
                );


    return null;
        }

}

LOG CAT：

07-01 14:22:44.918: E/AndroidRuntime(21063): FATAL EXCEPTION: main
07-01 14:22:44.918: E/AndroidRuntime(21063): Process: com.example.socketserverclient, PID: 21063
07-01 14:22:44.918: E/AndroidRuntime(21063): android.content.res.Resources$NotFoundException: String resource ID #0xd01a8c0
07-01 14:22:44.918: E/AndroidRuntime(21063):    at android.content.res.Resources.getText(Resources.java:244)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at android.widget.TextView.setText(TextView.java:3888)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at com.example.socketserverclient.MainActivity.getLocalIpAddress(MainActivity.java:56)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at com.example.socketserverclient.MainActivity.access$0(MainActivity.java:48)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at com.example.socketserverclient.MainActivity$1.onClick(MainActivity.java:42)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at android.view.View.performClick(View.java:4438)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at android.view.View$PerformClick.run(View.java:18422)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at android.os.Handler.handleCallback(Handler.java:733)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at android.os.Handler.dispatchMessage(Handler.java:95)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at android.os.Looper.loop(Looper.java:136)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at android.app.ActivityThread.main(ActivityThread.java:5017)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at java.lang.reflect.Method.invokeNative(Native Method)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at java.lang.reflect.Method.invoke(Method.java:515)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-01 14:22:44.918: E/AndroidRuntime(21063):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

这应该有效：

WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddr = wifiInfo.getIpAddress();

在清单文件中具有给定权限：

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

Answer 2

试试这个

protected String wifiIpAddress(Context context) {
    WifiManager wifiManager = (WifiManager) context.getSystemService(WIFI_SERVICE);
    int ipAddress = wifiManager.getConnectionInfo().getIpAddress();

    // Convert little-endian to big-endianif needed
    if (ByteOrder.nativeOrder().equals(ByteOrder.LITTLE_ENDIAN)) {
        ipAddress = Integer.reverseBytes(ipAddress);
    }

    byte[] ipByteArray = BigInteger.valueOf(ipAddress).toByteArray();

    String ipAddressString;
    try {
        ipAddressString = InetAddress.getByAddress(ipByteArray).getHostAddress();
    } catch (UnknownHostException ex) {
        Log.e("WIFIIP", "Unable to get host address.");
        ipAddressString = null;
    }

    return ipAddressString;
}

并授予此权限

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

像on this这样

从onCreate调用此方法

String str = wifiIpAddress(getApplicationContext());
your_Textview.setText(str);

修改

更改BSSID.setText(myIp);

到

BSSID.setText(myIp + "");

Answer 3

问题与IP地址功能无关。在内存地址找到资源时遇到问题：＃0xd01a8c0

检查资源是否已设置。与LogCat错误一样，它应该是strings.xml中的一个字符串

编辑

将BSSID.setText(myIp);替换为BSSID.setText(myIp + "");

Answer 4

问题出在这一行

BSSID.setText(myIp);

问题是您尝试在int的{{1}}方法中传递setText。

简而言之，您正在调用方法TextView而不是setText(int resid)

因此，Android会尝试查找您在setText(CharSequence text)中传递的资源，即不存在的setText，您将获得myIp

从

更改代码

ResourcesNotFoundException

到

BSSID.setText(myIp);

Answer 5

第56行： BSSID.setText（MYIP）;

myIp是一个整数，对于TextView的setText方法，根据SDK文档：

final void setText(int resid)

因此，android会认为myIp是一个资源ID，它无法通过myIp的值找到此资源。纠正此问题的最简单方法是：

BSSID.setText(""+myIp);

你实际上调用了TextView的这个方法：

final void setText(CharSequence text)

获取Android应用程序中连接的Wi fi的IP地址

5 个答案: