双模(CDMA/GSM)手机实现短信监听

一、问题分析：
最近在做一个通过短信远程启动应用的功能，要用到短信监听，代码如下
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.widget.Toast;

public class SMSReceiver extends BroadcastReceiver
{
    /*当收到短信时，就会触发此方法*/
    public void onReceive(Context context, Intent intent)
    {
        Bundle bundle = intent.getExtras();
        if(bundle!=null && bundle.get("pdus")!=null){
            Object[] pdus = (Object[]) bundle.get("pdus"); //得到由短信内容组成的数组对象
            if(pdus!=null && pdus.length>0){
                SmsMessage[] messages = new SmsMessage[pdus.length];
                for(int i=0;i<pdus.length;i++){
                    byte[] pdu = (byte[]) pdus[i]; //得到短信内容，内容是以pdu格式存放的
                    messages[i] = SmsMessage.createFromPdu(pdu);
                }

                for(SmsMessage msg:messages){
                    String smscontent = msg.getMessageBody(); //得到短信内容
                    String smssender = msg.getOriginatingAddress(); //得到短信发送者的手机号
                }
            }
        }
    }
}
实际应用时发现双模手机对接收到的短信处理时总是在SmsMessage.createFromPdu的地方出现异常，异常信息：
java.lang.OutOfMemoryError: array size too large
        at com.android.internal.telephony.cdma.SmsMessage.parsePdu(SmsMessage.java:658)
        at com.android.internal.telephony.cdma.SmsMessage.createFromPdu(SmsMessage.java:116)
        at android.telephony.SmsMessage.createFromPdu(SmsMessage.java:162)

而在android的源码中可以看到createFromPdu方法：

public static SmsMessage createFromPdu(byte[] pdu) {
        SmsMessageBase wrappedMessage;
        int activePhone = TelephonyManager.getDefault().getPhoneType();
        if (PHONE_TYPE_CDMA == activePhone) {
            wrappedMessage = com.android.internal.telephony.cdma.SmsMessage.createFromPdu(pdu);
        } else {
            wrappedMessage = com.android.internal.telephony.gsm.SmsMessage.createFromPdu(pdu);
        }
        return new SmsMessage(wrappedMessage);
    }
如果是双模手机，调用此方法时会产生错误，问题就在于源码的TelephonyManager.getDefault().getPhoneType();该方法的返回值没有对应的双模手机的类型，而原生的android系统是不支持双模手机的。

二、解决办法：

我们可以采用广播接收者和内容观察者相结合的方式，直接读取手机的短信数据库，这样就避免了错误的产生，废话就不多说了，直接上代码：
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Handler;
public class SMSReceiver extends BroadcastReceiver {
   
    private static final String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
   
    private Context m_Context;
    private SmsContentObserver m_Smsobserver = new SmsContentObserver(new Handler());
    @Override
    public void onReceive(Context context, Intent intent) {

        this.m_Context = context;
        if (intent.getAction().equals(SMS_RECEIVED)) {
             //注册短信变化监听 
            context.getContentResolver().registerContentObserver(Uri.parse("content://sms/"), true, m_Smsobserver);
        }
    }
   
   
    /**
     * 短信内容观察者
     * @author sinber
     *
     */
    private class SmsContentObserver extends ContentObserver{ 
       
            public SmsContentObserver(Handler handler) { 
                super(handler); 
            } 
            /**
             * @Description 当短信表发送改变时，调用该方法 
             *              需要两种权限
             *              <li>android.permission.READ_SMS读取短信 </li>
             *              <li>android.permission.WRITE_SMS写短信 </li>
             * @Author sinebr
             *
             */ 
            @Override 
            public void onChange(boolean selfChange) { 
                super.onChange(selfChange); 
                Cursor cursor = null; 
                try{
                    //读取收件箱中的短信 
                    cursor = m_Context.getContentResolver().query(Uri.parse("content://sms/inbox"), null, null, null, "date desc"); 
                    String body;
                    boolean hasDone = false;
                    if (cursor != null){ 
                        while (cursor.moveToNext()){
                            body = cursor.getString(cursor.getColumnIndex("body"));
                            if(body != null && body.equals("【startMyActivity】")){
                                //此处略去启动应用的代码
                                hasDone = true;
                                break;
                            }
                            if (hasDone){
                                break;
                            }
                        } 
                    }
              }catch(Exception e){
                  e.printStackTrace();
              }finally{
                  if(cursor!=null)
                      cursor.close();
              }
        } 
    }
}

最后别忘了在AndroidManifest.xml中添加相应的权限，
    <!-- 接收短信权限 -->
    <uses-permission android:name="android.permission.RECEIVE_SMS"/>
    <!-- 发送短信权限 -->
    <uses-permission android:name="android.permission.SEND_SMS"/>
还有别忘了注册广播接收者：

<receiver android:name=".SMSReceiver">
    <intent-filter>
        <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
    </intent-filter>
</receiver>

这样就能适应所有的android手机了，无论是双模还是单模都没问题，问题解决了。


原文链接：http://www.cnblogs.com/sinber/archive/2011/06/22/CDMA_GSM_SMS.html