电话状态的监听:

    /*** 
         * 继承PhoneStateListener类，我们可以重新其内部的各种监听方法 然后通过手机状态改变时，系统自动触发这些方法来实现我们想要的功能 
         */  
        class MyPhoneStateListener extends PhoneStateListener {  
      
            @Override  
            public void onCallStateChanged(int state, String incomingNumber) {  
                switch (state) {  
                case TelephonyManager.CALL_STATE_IDLE:  
                    Log.v(tag, "空闲状态 ");  
                    break;  
                case TelephonyManager.CALL_STATE_RINGING:  
                    Log.v(tag, "手机铃声响了，来电号码:" + incomingNumber);  
                    break;  
                case TelephonyManager.CALL_STATE_OFFHOOK:  
                    Log.v(tag, "通话状态 ");  
                    break;  
                default:  
                    break;  
                }  
      
                super.onCallStateChanged(state, incomingNumber);  
            }  
      
        }  

    // 发送短信  
                            smsManager = SmsManager.getDefault();  
                            PendingIntent pIntent = PendingIntent.getBroadcast(  
                                    ShopDealActivity.this, 0, new Intent(), 0);  
                            smsManager.sendTextMessage("10086", null, msg_string,  
                                    pIntent, null);  
                            Toast.makeText(context, "短信已发送", Toast.LENGTH_SHORT)  
                                    .show();