Question

我正在创建一个短信付费应用。我目前有两节课;一个主Activity类，用于修改设置和使用BroardcastReceiver的smsListener类。但是，我无法弄清楚如何启动smsListener类。 ref的smsListener类的代码

package sms.pack;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Environment;
import android.telephony.SmsMessage;
import android.util.Log;

public class SmsListener extends BroadcastReceiver{

    private SharedPreferences preferences;

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub

        if(intent.getAction().equals("android.provider.Telephony.SMS_RECEIVED")){
            Bundle bundle = intent.getExtras();           //---get the SMS message passed in---
            SmsMessage[] msgs = null;
            String device = "mobile_num_here"; //number to listen for
            String msg_from;
            if (bundle != null){
                //---retrieve the SMS message received---
                try{
                    Object[] pdus = (Object[]) bundle.get("pdus");
                    msgs = new SmsMessage[pdus.length];
                    for(int i=0; i<msgs.length; i++){
                        msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
                        msg_from = msgs[i].getOriginatingAddress();
                        String msgBody = msgs[i].getMessageBody();
                        if (msg_from == device)
                        {
                            savedata(msgBody);
                        }
                    }
                }catch(Exception e){
//                            Log.d("Exception caught",e.getMessage());
                }               
            }
        }
    }
    public void savedata(String data)
    {
        try {
            File root = Environment.getExternalStorageDirectory();
            if (root.canWrite()){
                File gpxfile = new File(root, "smsfile.txt");//remember change directory
                FileWriter gpxwriter = new FileWriter(gpxfile);
                BufferedWriter out = new BufferedWriter(gpxwriter);
                out.write(data);
                out.close();
            }
        } catch (IOException e) {
            Log.e(data,"Could not write file " + e.getMessage());
        }
    }
}

我正计划使用意图启动那是不行的，方法如下

public void startListening(View view)
{
    Intent i = new Intent();
    i.setClassName("sms.pack","sms.pack.SmsListener");
    startActivity(i);
}

Answer 1

您只能使用startActivity启动活动 BroadcastReceiver侦听广播意图。使用sendBroadcast（意图广播）。确保在清单文件中放置receiver标记。

Answer 2

您必须先注册广播接收器。

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity ....
    </activity>
    <receiver  android:name="SmsListener ">
        <intent-filter  android:priority="100" >
            <action android:name="android.intent.action.DATA_SMS_RECEIVED" />
        </intent-filter>
    </receiver>
</application>

通过以下方式启动广播接收器：

    Intent i = new Intent(your_Activity_Class.this, SmsListener.class);
    startActivity(i);

希望得到这个帮助。

启动Broadcast Receiver类

2 个答案: