Android 在用户从操作系统sms系统发送sms之前，是否有方法通知我的应用程序？

这个想法是，当用户从他的本机手机（而不是从我的应用程序）发送短信时，我是否可以得到通知，让我的应用程序在我决定是否让用户发送消息或停止发送消息之前执行一些检查选项，这取决于我的应用程序设置？

是的，您可以这样做，默认情况下，Android系统使用SmsManager类发送短信。您需要实现ContentObserver类来获取关于外出短信的详细信息

//访问代码

private SmsSentObserver smsSentObserver = null;
private static final Uri STATUS_URI = Uri.parse("content://sms");

if( smsSentObserver == null )
{
    smsSentObserver = new SmsSentObserver( new Handler(), context );
    context.getContentResolver().registerContentObserver(STATUS_URI, true, smsSentObserver);
}

//内容观察课

@SuppressLint("SimpleDateFormat")
public class SmsSentObserver extends ContentObserver 
{
    private SimpleDateFormat sdf = new SimpleDateFormat  ( "dd-MM-yyyy HH:mm:ss" );
    private static final Uri STATUS_URI = Uri.parse("content://sms");
    private Context context;

    public SmsSentObserver( Handler handler, Context context ) 
    {
        super(handler);
        this.context = context;
    }

    public boolean deliverSelfNotifications() {return true;}

    public void onChange(boolean selfChange) 
    {
        try
        {
            Cursor sms_sent_cursor = context.getContentResolver().query(STATUS_URI, null, null, null, null);
            if (sms_sent_cursor != null) 
            {
                if (sms_sent_cursor.moveToFirst()) 
                {
                    if ( sms_sent_cursor.getString(sms_sent_cursor.getColumnIndex("protocol") ) == null  )
                    {
                        if ( sms_sent_cursor.getInt(sms_sent_cursor.getColumnIndex("type")) == 2 );
                        {
                            StringBuffer msgDetail = new StringBuffer();
                            msgDetail.append( "\n Sent To : " + sms_sent_cursor.getString(sms_sent_cursor.getColumnIndex("address")) );
                            msgDetail.append( "\n" + sms_sent_cursor.getString(sms_sent_cursor.getColumnIndex("body")) );
                            msgDetail.append( "\n Date : " + sdf.format( sms_sent_cursor.getLong(sms_sent_cursor.getColumnIndex("date"))) );
                            LogFile logFile = new LogFile( context );
                            logFile.appendData( msgDetail.toString().trim() , context.getString( R.string.LogFileName ) );
                            logFile = null;
                            msgDetail = null;
                        }
                    }
                }
            }
        }
        catch( Exception e )
        {
            LogFile logFile = new LogFile( context );
            logFile.appendData( context.getString( R.string.SENT_SMS_ERROR ) + e.toString() , context.getString( R.string.LogFileName ) );
            logFile = null;
        }
        finally { System.gc(); }
        super.onChange(selfChange);
    }
}