一条短信就可以获取被盗手机的GPS位置（PhoneFinder）

 哎，忙了一中午就搞了一个小实例，发现自己的效率还有待提高，不过，虽说是一个小实例，让我对短信这块掌握了许多！

先贴代码：(必要的解释都在注释中，不懂得可以留言)！

MainActivity：PhoneFinder.java

package com.android.yhb;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.app.Activity;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class PhoneFinder extends Activity {
    private EditText edit01;
    private EditText edit02;
    private Button button_ok;
    private TextView textview;
    static final String PASSWORD_PREF_KEY = "passwd";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        edit01 = (EditText)findViewById(R.id.password);
        edit02 = (EditText)findViewById(R.id.password_confirm);
        textview = (TextView)findViewById(R.id.text1);
        button_ok = (Button)findViewById(R.id.ok);
        button_ok.setOnClickListener(listener);
        /*SharedPreferences setting = getSharedPreferences(PASSWORD_PREF_KEY, 0);
        String t1 = setting.getString("PASSWORD", null);
        edit01.setText(t1);
        edit02.setText(t1);*/
    }

    OnClickListener listener = new OnClickListener() {
        public void onClick(View v) {
            String p1 = edit01.getText().toString();
            String p2 = edit02.getText().toString();
            if(p1.equals(p2)) {
                if(p1.length() >= 6 && p2.length() >= 6) {
                    Editor edit = getSharedPreferences(PASSWORD_PREF_KEY, MODE_PRIVATE).edit();
                    String md5hash = getMd5Hash(p1);
                    edit.putString("PASSWORD", md5hash);
                    edit.commit();
                    textview.setText("password updated");
                } else {
                    textview.setText("password must be at least 6 characters");
                }
            } else {
                edit01.setText("");
                edit02.setText("");
                textview.setText("password do not match");
            }
        }
    };
    //这里是MD5的加密方法
    public static String getMd5Hash(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] messageDigest = md.digest(input.getBytes());
            BigInteger number = new BigInteger(1,messageDigest);
            String md5 = number.toString(16);

            while (md5.length() < 32)
                md5 = "0" + md5;
                return md5;
        } catch(NoSuchAlgorithmException e) {
            Log.e("MD5", e.getMessage());
            return null;
        }
    }
}

FinderReceiver.java

package com.android.yhb;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.telephony.gsm.SmsManager;
import android.telephony.gsm.SmsMessage;

public class FinderReceiver extends BroadcastReceiver {
      Context context;
    @Override
    public void onReceive(Context context, Intent intent) {
        this.context = context;
        SharedPreferences passwdfile = context.getSharedPreferences(
                PhoneFinder.PASSWORD_PREF_KEY, 0);

        String correctMd5 = passwdfile.getString(PhoneFinder.PASSWORD_PREF_KEY,
                null);
        if (correctMd5 != null) {

            /*SmsMessage[] messages = Telephony.Sms.Intents
                    .getMessagesFromIntent(intent);*/
            Bundle bundle = intent.getExtras();
              Object pdus[] = (Object[]) bundle.get("pdus");//SMS消息的byte[]存储在pdus中
              SmsMessage smsMessage[] = new SmsMessage[pdus.length];

            //for (SmsMessage msg : smsMessage) {
              for(int i = 0; i < smsMessage.length; i++) {
                  smsMessage[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
                if (smsMessage[i].getMessageBody().contains("SMSLOCATE:")) {
                    String[] tokens = smsMessage[i].getMessageBody().split(":");
                    if (tokens.length >= 2) {
                        String md5hash = PhoneFinder.getMd5Hash(tokens[1]);

                        if (md5hash.equals(correctMd5)) {
                            String to = smsMessage[i].getOriginatingAddress();//以字符串的形式返回发送者(sender)的原始地址
                            SmsManager sm = SmsManager.getDefault();
                            /*LocationManager lm =
                                (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
                            SmsManager sm = SmsManager.getDefault();
                            Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            double latitude = location.getLatitude();     //经度
                            double longitude = location.getLongitude(); //纬度
                            double altitude =  location.getAltitude();     //海拔

                            sm.sendTextMessage(to, null, "经度：" + String.valueOf(latitude) + "纬度：" + String.valueOf(longitude) + "海拔：" + String.valueOf(altitude),
                                    null, null); */
                             sm.sendTextMessage(to, null, "成功了！", null, null);
                            NotificationManager nm =
                                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
                            Notification notification = new Notification(android.R.drawable.ic_dialog_info, "您的地理位置", System.currentTimeMillis());
                            PendingIntent contentIntent = PendingIntent.getActivity(context, 0, new Intent(context, PhoneFinder.class), 0);
                            notification.setLatestEventInfo(context, "GPS地址", "你已经被发现了，赶紧把手机还给我，不然我就报警！", contentIntent);
                            nm.notify(R.string.service_start, notification);
                        }
                    }
                } }
            //}
        }
    }
}

这段代码中我注释了关于GPS的求解过程，主要是因为在模拟器上不好搞GPS的位置，我试着用DDMS的send发送GPS坐标，但是不见效果，不知为何。所以注释掉，我想在真机上肯定会有效果的，因为求解GPS坐标这段代码完整无误，经常用！

这个实例实际上是我在一个论坛里看到的，他的源代码我运行不成功，并且他的源代码好像是基于Android1.0API的，经过多方努力，终于把他改成新版本下的程序，主要改动了第36行代码，第36行代码主要是从pdus中恢复出SmsMessage对象。