为什么我发送短信时我的 ContentObserver 没有被调用? [英] Why my ContentObserver is not being called when I send an SMS?

问题描述

我正在尝试检测何时发送短信.我在网上和 StackOverflow 上搜索过，似乎都是相同的解决方案.我有一个简单的活动，它启动一个服务，在服务中我试图检测何时发送短信:

I am trying to detect when a SMS is sent. I have searched on the web and on StackOverflow and all seems to be the same solution. I have a simple Activity that starts a Service and in the service I am trying to detect when a SMS is sent:

MainActivity.java

import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.view.Menu;

public class MainActivity extends Activity {

    Intent serviceIntent;
    private static MyReceiver mServiceReceiver; 

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

    @Override
    protected void onPause() {
        Log.i("Status","Pause");
        unregisterReceiver(mServiceReceiver);
        super.onPause();
    }

    @Override
    protected void onResume() {
        Log.i("Status","Resume");

        // Inicio el Servicio
        serviceIntent = new Intent(MainActivity.this, TrackerService.class);
        startService(serviceIntent);
        // Registro el broadcast del Service para obtener los datos
        mServiceReceiver = new MyReceiver();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(TrackerService.mAction);
        registerReceiver(mServiceReceiver, intentFilter);

        super.onResume();
    }

    /**
     * Receiver del Service, aqui se obtienen los datos que envia el Service
     */
    private class MyReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context arg0, Intent arg1) {
            Log.i("ServiceReceiver", "onReceive()");
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

TrackerService.java

import android.app.Service;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;

public class TrackerService extends Service{

    // Nombre del service
    public static final String mAction = "SMSTracker";
    ContentResolver content;
    ContentResolver contentResolver;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("Status","Service Start");

        // ContentResolver para obtener los SMS salientes
        contentResolver = this.getContentResolver();
        contentResolver.registerContentObserver(Uri.parse("content://sms/out"), true, new mObserver(new Handler()));

        return super.onStartCommand(intent, flags, startId);
    }

    /**
     * Observer que obtiene los SMS salientes
     */
    class mObserver extends ContentObserver {

        public mObserver(Handler handler) {
            super(handler);
        }

        @Override
        public void onChange(boolean selfChange) {
            super.onChange(selfChange);
            Log.i("Status","onChange");

            Uri uriSMS = Uri.parse("content://sms/out");
            Cursor cur = contentResolver.query(uriSMS, null, null, null, null);
            Log.i("SMS", "Columns: " + cur.getColumnNames());

            cur.moveToNext();
            String smsText = cur.getString(cur.getColumnIndex("body"));

            Log.i("SMS", "SMS Lenght: " + smsText.length());

        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("Status","Service Destroy");
    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.i("Status","Service Bind");
        return null;
    }

}

清单

<uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
    <uses-permission android:name="android.permission.READ_SMS"></uses-permission>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    <service android:name=".TrackerService" />

</application>

根据我的 LogCat，该服务已启动，我可以在 Android 手机的运行服务中看到它，当我发送短信时，我的服务中的 onChange() 方法从未被调用.我缺少什么吗?

According to my LogCat the service is started and I can see it in running services in my Android phone onChange() method inside my service is never called when I send an sms. Is something I am missing ?

推荐答案

好吧，似乎没有办法，不知道是不是我的错误在 Android 上的错误，但我得到了它:

Ok, seems there is no way, don´t know if it is my error on an Android bug but I got it working:

        if( (type == 2 || type == 1) && (!lastID.contentEquals(cur.getString(cur.getColumnIndex("_id")))) ){
            String protocol = cur.getString(cur.getColumnIndex("protocol"));
            lastID = cur.getString(cur.getColumnIndex("_id"));
            // Mensaje enviado
            if(protocol == null){
                Log.i("SMSStatus", "SMS Sent");
            }
            // Mensaje recibido
            else{
                Log.i("SMSStatus", "SMS received");
            }
        }

当收到一条短信时，它是 type = 1，当发送一条短信时，它的类型是 6、4，最后当它被发送时是 type = 2.要小心，因为有时 onChange 方法被调用了很多次，不管是否它只是一条短信，因此您应该通过检查 _id 参数来检测它是否是同一条短信.

When an SMS is received it is type = 1, when send an SMS and its type 6, 4 and finally when it is sent is type = 2. Be carefull because sometimes the onChange method is called lots of times no matters if it is only one SMS so you should detect if it is the same SMS by checking the _id parameter.

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