如何在Android上制作Wake On Lan？

Question

您能否告訴我，如何制作Android版Wake On Lan應用程序？ 我在Google上搜索了兩個星期，嘗試了所有內容，從lan應用程序的另一端下載了源代碼，並嘗試查找用於制作和發送魔術包的代碼。 看起來所有其他代碼都可以使用，但是當我在應用程序中使用它時，它將無法使用！ 而且我還嘗試編輯Java代碼以使其適用於Android（此代碼： http : //www.jibble.org/wake-on-lan/WakeOnLan.java ）。 你能幫我嗎？ 抱歉我的英語不好。 這是我的代碼：

package com.macura.wakemypc;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

import com.macura.wakemypc.MainActivity;

import com.macura.wakemypc.R;
import com.macura.wakemypc.MainActivity;

import com.macura.wakemypc.MainActivity;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends Activity {
public static final int PORT = 9; 





@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
 }
 public void buttonClick(View view) {
EditText iptext = (EditText)findViewById(R.id.ipbox);
EditText mactext = (EditText)findViewById(R.id.macbox);
String broadcastIP = String.valueOf(iptext.getText());
String mac = String.valueOf(mactext.getText());
Log.d("Read mac= ", mac);
Log.d("Read ip=", broadcastIP);
MainActivity.wakeup(broadcastIP, mac);
  }
 private static byte[] getMacBytes(String mac) throws IllegalArgumentException {
     Log.d("GetMacBytes", "method started");
// TODO Auto-generated method stub
byte[] bytes = new byte[6];
try {
    String hex;
    for (int i = 0; i < 6; i++) {
        hex = mac.substring(i*2, i*2+2);
        bytes[i] = (byte) Integer.parseInt(hex, 16);
        Log.d("GetMacbytes", "calculated");
        Log.d("GetMacBytes (bytes)", new String(bytes));
    }
}
catch (NumberFormatException e) {
    Log.e("GetMacBytes","error");
}
return bytes;
 }

 public static void wakeup(String broadcastIP, String mac) {
     Log.d("wakeup", "method started");
if (mac == null) {
    Log.d("Mac error at wakeup", "mac = null");
    return;
}

    try {
        byte[] macBytes = getMacBytes(mac);
        Log.d("wakeup (bytes)", new String(macBytes));
        byte[] bytes = new byte[6 + 16 * macBytes.length];
        for (int i = 0; i < 6; i++) {
            bytes[i] = (byte) 0xff;
        }
        for (int i = 6; i < bytes.length; i += macBytes.length) {
            System.arraycopy(macBytes, 0, bytes, i, macBytes.length);
        }

        Log.d("wakeup", "calculating completed, sending...");
        InetAddress address = InetAddress.getByName(broadcastIP);
        DatagramPacket packet = new DatagramPacket(bytes, bytes.length, address, 9);
        DatagramSocket socket = new DatagramSocket();
        socket.send(packet);
        socket.close();
        Log.d("wakeup", "Magic Packet sent");



         }
         catch (Exception e) {
             Log.e("wakeup", "error");
     }

 }

 }

這是Logcat的輸出（我用X代替了mac）：

07-07 14:58:36.282: D/Read mac=(7247): XX:XX:XX:XX:XX:XX
07-07 14:58:36.282: D/Read ip=(7247): 192.168.1.255
07-07 14:58:36.282: D/wakeup(7247): method started
07-07 14:58:36.282: D/GetMacBytes(7247): method started
07-07 14:58:36.282: D/GetMacbytes(7247): calculated
07-07 14:58:36.282: D/GetMacBytes (bytes)(7247): ������������
07-07 14:58:36.282: E/GetMacBytes(7247): error
07-07 14:58:36.282: W/System.err(7247): java.lang.NumberFormatException: Invalid int:       ":1"
07-07 14:58:36.282: W/System.err(7247):     at         java.lang.Integer.invalidInt(Integer.java:138)
07-07 14:58:36.282: W/System.err(7247):     at     java.lang.Integer.parse(Integer.java:375)
07-07 14:58:36.282: W/System.err(7247):     at     java.lang.Integer.parseInt(Integer.java:366)
07-07 14:58:36.282: W/System.err(7247):     at   com.macura.wakemypc.MainActivity.getMacBytes(MainActivity.java:57)
07-07 14:58:36.282: W/System.err(7247):     at   com.macura.wakemypc.MainActivity.wakeup(MainActivity.java:77)
07-07 14:58:36.282: W/System.err(7247):     at    com.macura.wakemypc.MainActivity.buttonClick(MainActivity.java:47)
07-07 14:58:36.282: W/System.err(7247):     at    java.lang.reflect.Method.invokeNative(Native Method)
07-07 14:58:36.282: W/System.err(7247):     at  java.lang.reflect.Method.invoke(Method.java:511)
07-07 14:58:36.282: W/System.err(7247):     at    android.view.View$1.onClick(View.java:3586)
07-07 14:58:36.292: W/System.err(7247):     at   android.view.View.performClick(View.java:4084)
07-07 14:58:36.292: W/System.err(7247):     at   android.view.View$PerformClick.run(View.java:16966)
07-07 14:58:36.292: W/System.err(7247):     at   android.os.Handler.handleCallback(Handler.java:615)
07-07 14:58:36.292: W/System.err(7247):     at   android.os.Handler.dispatchMessage(Handler.java:92)
07-07 14:58:36.292: W/System.err(7247):     at android.os.Looper.loop(Looper.java:137)
07-07 14:58:36.292: W/System.err(7247):     at     android.app.ActivityThread.main(ActivityThread.java:4931)
07-07 14:58:36.292: W/System.err(7247):     at  java.lang.reflect.Method.invokeNative(Native Method)
07-07 14:58:36.292: W/System.err(7247):     at   java.lang.reflect.Method.invoke(Method.java:511)
07-07 14:58:36.292: W/System.err(7247):     at   com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
07-07 14:58:36.292: W/System.err(7247):     at     com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
07-07 14:58:36.292: W/System.err(7247):     at dalvik.system.NativeStart.main(Native     Method)
07-07 14:58:36.292: D/wakeup (bytes)(7247): ������������
07-07 14:58:36.292: D/wakeup(7247): calculating completed, sending...
07-07 14:58:36.292: E/wakeup(7247): error
07-07 14:58:36.292: W/System.err(7247): android.os.NetworkOnMainThreadException
07-07 14:58:36.292: W/System.err(7247):     at    android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
07-07 14:58:36.302: W/System.err(7247):     at libcore.io.BlockGuardOs.sendto(BlockGuardOs.java:175)
07-07 14:58:36.302: W/System.err(7247):     at libcore.io.IoBridge.sendto(IoBridge.java:473)
07-07 14:58:36.302: W/System.err(7247):     at java.net.PlainDatagramSocketImpl.send(PlainDatagramSocketImpl.java:182)
07-07 14:58:36.302: W/System.err(7247):     at java.net.DatagramSocket.send(DatagramSocket.java:284)
07-07 14:58:36.302: W/System.err(7247):     at com.macura.wakemypc.MainActivity.wakeup(MainActivity.java:91)
07-07 14:58:36.302: W/System.err(7247):     at    com.macura.wakemypc.MainActivity.buttonClick(MainActivity.java:47)
07-07 14:58:36.302: W/System.err(7247):     at java.lang.reflect.Method.invokeNative(Native Method)
07-07 14:58:36.302: W/System.err(7247):     at java.lang.reflect.Method.invoke(Method.java:511)
07-07 14:58:36.302: W/System.err(7247):     at android.view.View$1.onClick(View.java:3586)
07-07 14:58:36.302: W/System.err(7247):     at android.view.View.performClick(View.java:4084)
07-07 14:58:36.302: W/System.err(7247):     at android.view.View$PerformClick.run(View.java:16966)
07-07 14:58:36.302: W/System.err(7247):     at android.os.Handler.handleCallback(Handler.java:615)
07-07 14:58:36.302: W/System.err(7247):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-07 14:58:36.302: W/System.err(7247):     at android.os.Looper.loop(Looper.java:137)
07-07 14:58:36.312: W/System.err(7247):     at   android.app.ActivityThread.main(ActivityThread.java:4931)
07-07 14:58:36.312: W/System.err(7247):     at  java.lang.reflect.Method.invokeNative(Native Method)
07-07 14:58:36.312: W/System.err(7247):     at  java.lang.reflect.Method.invoke(Method.java:511)
07-07 14:58:36.312: W/System.err(7247):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
07-07 14:58:36.312: W/System.err(7247):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
07-07 14:58:36.312: W/System.err(7247):     at dalvik.system.NativeStart.main(Native   Method)

Answer 1

沒有有關您的應用程序的更多詳細信息，您可能想嘗試的是GCM。 您設置為接收GCM消息，然后發送GCM消息，這將喚醒設備，並且對於您要實現的任何目的可能同樣足夠。

Answer 2

看來您使用錯誤的方法從edittext (toString)獲取文本，您必須使用gettext 。

Answer 3

在高於3.的Android版本上，如果您位於主線程中，則無法進行聯網，在這種情況下，主線程為MainActivity！ 只需在線程內部調用該函數：

new Thread(new Runnable() {
    public void run() {
        wakeup(broadcastIP, mac);
    }
}).start();

如果您不知道什么是線程，請閱讀有關線程的內容