Android提供的系统服务之--TelephonyManager(电话管理器)

Android提供的系统服务之--TelephonyManager(电话管理器)
转载请注明出处——coder-pig

TelephonyManager的作用:

用于管理手机通话状态，获取电话信息(设备信息、sim卡信息以及网络信息)，
侦听电话状态(呼叫状态服务状态、信号强度状态等)以及可以调用电话拨号器拨打电话！

如何获得TelephonyManager的服务对象:

TelephonyManager tManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);

TelephonyManager的相关用法实例:

1.调用拨号器拨打电话号码:

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Uri uri=Uri.parse("tel:"+电话号码);

Intent intent=new Intent(Intent.ACTION_DIAL,uri);

startActivity(intent);

ps:调用的是系统的拨号界面哦！

2.获取Sim卡信息与网络信息

运行效果图:(模拟器下获取不了相关信息的哦,这里用的是真机哈!)



代码实现流程:
1.定义了一个存储状态名称的array.xml的数组资源文件；
2.布局定义了一个简单的listview,列表项是两个水平方向的textview
3.Activity界面中调用相关方法获得对应参数的值,再把数据绑定到listview上!

详细代码如下:
array.xml:

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<?xml version="1.0" encoding="utf-8"?>

<resources>

<!-- 声明一个名为statusNames的字符串数组 -->

<string-array name="statusNames">

<item>设备编号</item>

<item>软件版本</item>

<item>网络运营商代号</item>

<item>网络运营商名称</item>

<item>手机制式</item>

<item>设备当前位置</item>

<item>SIM卡的国别</item>

<item>SIM卡序列号</item>

<item>SIM卡状态</item>

</string-array>

<!-- 声明一个名为simState的字符串数组 -->

<string-array name="simState">

<item>状态未知</item>

<item>无SIM卡</item>

<item>被PIN加锁</item>

<item>被PUK加锁</item>

<item>被NetWork PIN加锁</item>

<item>已准备好</item>

</string-array>

<!-- 声明一个名为phoneType的字符串数组 -->

<string-array name="phoneType">

<item>未知</item>

<item>GSM</item>

<item>CDMA</item>

</string-array>

</resources>

布局代码如下:
activity_main.xml:

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/LinearLayout1"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context="com.jay.example.getphonestatus.MainActivity" >

<ListView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/statuslist" />

</LinearLayout>

line.xml:

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<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal" >

<TextView

android:id="@+id/name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:width="230px"

android:textSize="16dp"

/>

<TextView

android:id="@+id/value"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:paddingLeft="8px"

android:textSize="16dp"

/>

</LinearLayout>

MainActivity.java

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package com.jay.example.getphonestatus;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Map;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.telephony.TelephonyManager;

import android.widget.ListView;

import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

//定义一个ListView对象,一个代表状态名称的数组,以及手机状态的集合

private ListView showlist;

private String[] statusNames;

private ArrayList<String> statusValues = new ArrayList<String>();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

showlist = (ListView) findViewById(R.id.statuslist);

//①获得系统提供的TelphonyManager对象的实例

TelephonyManager tManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

//②获得状态名词的数组,Sim卡状态的数组,电话网络类型的数组

//就是获得array.xml中的对应数组名的值

statusNames = getResources().getStringArray(R.array.statusNames);

String[] simState = getResources().getStringArray(R.array.simState);

String[] phoneType = getResources().getStringArray(R.array.phoneType);

//③按照array.xml中的顺序,调用对应的方法,将相应的值保存到集合里

statusValues.add(tManager.getDeviceId()); //获得设备编号

//获取系统平台的版本

statusValues.add(tManager.getDeviceSoftwareVersion()

!= null? tManager.getDeviceSoftwareVersion():"未知");

statusValues.add(tManager.getNetworkOperator()); //获得网络运营商代号

statusValues.add(tManager.getNetworkOperatorName()); //获得网络运营商的名称

statusValues.add(phoneType[tManager.getPhoneType()]); //获得手机的网络类型

// 获取设备所在位置

statusValues.add(tManager.getCellLocation() != null ? tManager

.getCellLocation().toString() : "未知位置");

statusValues.add(tManager.getSimCountryIso()); // 获取SIM卡的国别

statusValues.add(tManager.getSimSerialNumber()); // 获取SIM卡序列号

statusValues.add(simState[tManager.getSimState()]); // 获取SIM卡状态

//④遍历状态的集合,把状态名与对应的状态添加到集合中

ArrayList<Map<String, String>> status =

new ArrayList<Map<String, String>>();

for (int i = 0; i < statusValues.size(); i++)

{

HashMap<String, String> map = new HashMap<String, String>();

map.put("name", statusNames[i]);

map.put("value", statusValues.get(i));

status.add(map);

}

//⑤使用SimpleAdapter封装List数据

SimpleAdapter adapter = new SimpleAdapter(this, status,

R.layout.line, new String[] { "name", "value" }

, new int[] { R.id.name, R.id.value });

// 为ListView设置Adapter

showlist.setAdapter(adapter);

}

}

最后别忘了,往AndroidManifest.xml文件中添加下述权限哦!

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<!-- 添加访问手机位置的权限 -->

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

<!-- 添加访问手机状态的权限 -->

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

3.监听手机的所有来电:

对于监听到的通话记录结果,你可以采取不同的方式获取到,这里用到的是把通话记录写入到文件中,
而你也可以以短信的形式发送给你,或者是上传到某个平台,当然如果通信记录不多的话还可以用短信
多了的话就很容易给人发现的了！
另外,这里用的是Activity而非Service,就是说要打开这个Activity,才可以进行监听,通常我们的需求都是
要偷偷滴在后台跑的,因为时间关系就不写Service的了,大家自己写写吧,让Service随开机一起启动即可!

代码解析:
很简单,其实就是重写TelephonyManager的一个通话状态监听器PhoneStateListener
然后调用TelephonyManager.listen()的方法进行监听,当来电的时候,
程序就会将来电号码记录到文件中

MainActivity.java:

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package com.jay.PhoneMonitor;

import java.io.FileNotFoundException;

import java.io.OutputStream;

import java.io.PrintStream;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.telephony.PhoneStateListener;

import android.telephony.TelephonyManager;

import java.util.Date;

public class MainActivity extends Activity

{

TelephonyManager tManager;

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// 取得TelephonyManager对象

tManager = (TelephonyManager)

getSystemService(Context.TELEPHONY_SERVICE);

// 创建一个通话状态监听器

PhoneStateListener listener = new PhoneStateListener()

{

@Override

public void onCallStateChanged(int state, String number)

{

switch (state)

{

// 无任何状态

case TelephonyManager.CALL_STATE_IDLE:

break;

case TelephonyManager.CALL_STATE_OFFHOOK:

break;

// 来电铃响时

case TelephonyManager.CALL_STATE_RINGING:

OutputStream os = null;

try

{

os = openFileOutput("phoneList", MODE_APPEND);

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}

PrintStream ps = new PrintStream(os);

// 将来电号码记录到文件中

ps.println(new Date() + " 来电：" + number);

ps.close();

break;

default:

break;

}

super.onCallStateChanged(state, number);

}

};

// 监听电话通话状态的改变

tManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);

}

}

当然还需要在AndroidManifest.xml中添加下面的权限:

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<!-- 授予该应用读取通话状态的权限 -->

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

运行效果:
注意!要让这个程序位于前台哦!用另一个电话拨打该电话,接着就可以在DDMS的file Explorer的应用
对应包名的files目录下看到phoneList的文件了,我们可以将他导出到电脑中打开,文件的大概内容如下:
THR Oct 30 12:05:48 GMT 2014 来电: 137xxxxxxx

4.黑名单来电自动挂断:

所谓的黑名单就是将一些电话号码添加到一个集合中,当手机接收到这些电话的时候就直接挂断！
但是Android并没有给我们提供挂断电话的API,于是乎我们需要通过AIDL来调用服务中的API来
实现挂断电话!
于是乎第一步要做的就是把android源码中的下面两个文件复制到src下的相应位置,他们分别是:
com.android.internal.telephony包下的ITelephony.aidl;
android.telephony包下的NeighboringCellInfo.aidl;
要创建对应的包哦!就是要把aidl文件放到上面的包下!!!
接着只需要调用ITelephony的endCall即可挂断电话!

这里给出的是简单的单个号码的拦截,输入号码,点击屏蔽按钮后,如果此时屏蔽的电话呼入的话;
直接会挂断,代码还是比较简单的,下面粘一下,因为用的模拟器是Genymotion,所以就不演示
程序运行后的截图了!

MainActivity.java:

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package com.jay.example.locklist;

import java.lang.reflect.Method;

import com.android.internal.telephony.ITelephony;

import android.app.Activity;

import android.os.Bundle;

import android.os.IBinder;

import android.telephony.PhoneStateListener;

import android.telephony.TelephonyManager;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends Activity {

private TelephonyManager tManager;

private PhoneStateListener pListener;

private String number;

private EditText locknum;

private Button btnlock;

public class PhonecallListener extends PhoneStateListener

{

@Override

public void onCallStateChanged(int state, String incomingNumber) {

switch(state)

{

case TelephonyManager.CALL_STATE_IDLE:break;

case TelephonyManager.CALL_STATE_OFFHOOK:break;

//当有电话拨入时

case TelephonyManager.CALL_STATE_RINGING:

if(isBlock(incomingNumber))

{

try

{

Method method = Class.forName("android.os.ServiceManager")

.getMethod("getService", String.class);

// 获取远程TELEPHONY_SERVICE的IBinder对象的代理

IBinder binder = (IBinder) method.invoke(null,

new Object[] { TELEPHONY_SERVICE });

// 将IBinder对象的代理转换为ITelephony对象

ITelephony telephony = ITelephony.Stub.asInterface(binder);

// 挂断电话

telephony.endCall();

}catch(Exception e){e.printStackTrace();}

}

break;

}

super.onCallStateChanged(state, incomingNumber);

}

}

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

locknum = (EditText) findViewById(R.id.locknum);

btnlock = (Button) findViewById(R.id.btnlock);

//获取系统的TelephonyManager管理器

tManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);

pListener = new PhoneStateListener();

tManager.listen(pListener, PhoneStateListener.LISTEN_CALL_STATE);

btnlock.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

number = locknum.getText().toString();

}

});

}

public boolean isBlock(String phone)

{

if(phone.equals(number))return true;

return false;

}

}

另外还需要添加下述的权限:

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<!-- 授予该应用控制通话的权限 -->

<uses-permission android:name="android.permission.CALL_PHONE" />

<!-- 授予该应用读取通话状态的权限 -->

<uses-permission android:name="android.permission.READ_PHONE_STATE" />

当然,更多的时候我们屏蔽的不会只是一个号码,这个时候可以使用集合,把多个要屏蔽的号码添加到
集合中,或者是文件中,这里就直接给出李刚老师的demo,他提供的是一个带复选框的列表供用户
勾选黑名单,这里就不解析了,直接给出代码下载吧!

单个号码拦截的demo:点击下载
李刚老师的列表黑名单拦截demo:点击下载

TelephonyManager的相关属性与方法:

Constants

String	ACTION_PHONE_ STATE_CHANGED	Broadcast intent action indicating that the call state (cellular) on the device has changed.
int	CALL_STATE_IDLE	Device call state: No activity. 空闲（无呼入或已挂机）
int	CALL_STATE_OFFHOOK	Device call state: Off-hook. 摘机（有呼入）
int	CALL_STATE_RINGING	Device call state: Ringing. 响铃（接听中）
int	DATA_ACTIVITY_DORMANT	Data connection is active, but physical link is down 电话数据活动状态类型：睡眠模式（3.1版本）
int	DATA_ACTIVITY_IN	Data connection activity: Currently receiving IP PPP traffic. 电话数据活动状态类型：数据流入
int	DATA_ACTIVITY_INOUT	Data connection activity: Currently both sending and receiving IP PPP traffic.电话数据活动状态类型：数据交互
int	DATA_ACTIVITY_NONE	Data connection activity: No traffic. 电话数据活动状态类型：无数据流动
int	DATA_ACTIVITY_OUT	Data connection activity: Currently sending IP PPP traffic. 电话数据活动状态类型：数据流出
int	DATA_CONNECTED	Data connection state: Connected. 数据连接状态类型：已连接
int	DATA_CONNECTING	Data connection state: Currently setting up a data connection. 数据连接状态类型：正在连接
int	DATA_DISCONNECTED	Data connection state: Disconnected. 数据连接状态类型：断开
int	DATA_SUSPENDED	Data connection state: Suspended. 数据连接状态类型：已暂停
String	EXTRA_INCOMING_NUMBER	The lookup key used with the ACTION_PHONE_STATE_CHANGED broadcast for a String containing the incoming phone number.
String	EXTRA_STATE	The lookup key used with the ACTION_PHONE_STATE_CHANGED broadcast for a String containing the new call state.
int	NETWORK_TYPE_1xRTT	Current network is 1xRTT
int	NETWORK_TYPE_CDMA	Current network is CDMA: Either IS95A or IS95B
int	NETWORK_TYPE_EDGE	Current network is EDGE
int	NETWORK_TYPE_EHRPD	Current network is eHRPD
int	NETWORK_TYPE_EVDO_0	Current network is EVDO revision 0
int	NETWORK_TYPE_EVDO_A	Current network is EVDO revision A
int	NETWORK_TYPE_EVDO_B	Current network is EVDO revision B
int	NETWORK_TYPE_GPRS	Current network is GPRS
int	NETWORK_TYPE_HSDPA	Current network is HSDPA
int	NETWORK_TYPE_HSPA	Current network is HSPA
int	NETWORK_TYPE_HSPAP	Current network is HSPA+
int	NETWORK_TYPE_HSUPA	Current network is HSUPA
int	NETWORK_TYPE_IDEN	Current network is iDen
int	NETWORK_TYPE_LTE	Current network is LTE
int	NETWORK_TYPE_UMTS	Current network is UMTS
int	NETWORK_TYPE_UNKNOWN	Network type is unknown
int	PHONE_TYPE_CDMA	Phone radio is CDMA.
int	PHONE_TYPE_GSM	Phone radio is GSM.
int	PHONE_TYPE_NONE	No phone radio.
int	PHONE_TYPE_SIP	Phone is via SIP.
int	SIM_STATE_ABSENT	SIM card state: no SIM card is available in the device
int	SIM_STATE_NETWORK_LOCKED	SIM card state: Locked: requries a network PIN to unlock
int	SIM_STATE_PIN_REQUIRED	SIM card state: Locked: requires the user's SIM PIN to unlock
int	SIM_STATE_PUK_REQUIRED	SIM card state: Locked: requires the user's SIM PUK to unlock
int	SIM_STATE_READY	SIM card state: Ready
int	SIM_STATE_UNKNOWN	SIM card state: Unknown.

F ields

public static final String	EXTRA_STATE_IDLE	Value used with EXTRA_STATE corresponding to CALL_STATE_IDLE.
public static final String	EXTRA_STATE_OFFHOOK	Value used with EXTRA_STATE corresponding to CALL_STATE_OFFHOOK.
public static final String	EXTRA_STATE_RINGING	Value used with EXTRA_STATE corresponding to CALL_STATE_RINGING.

Public Methods

int	getCallState()	Returns a constant indicating the call state (cellular) on the device.
CellLocation	getCellLocation()	Returns the current location of the device.
int	getDataActivity()	Returns a constant indicating the type of activity on a data connection (cellular). 处理侦测到的数据活动的改变事件。通过该函数，可以获取数据活动状态信息。 电话数据活动状态类型定义在TelephoneyManager类中。 DATA_ACTIVITY_NONE 无数据流动 DATA_ACTIVITY_IN 数据流入 DATA_ACTIVITY_OUT 数据流出 DATA_ACTIVITY_INOUT 数据交互 DATA_ACTIVITY_DORMANT 睡眠模式（2.1版本）
int	getDataState()	Returns a constant indicating the current data connection state (cellular).
String	getDeviceId()	Returns the unique device ID, for example, the IMEI for GSM and the MEID or ESN for C DMA phones.获取设备标识（IMEI）
String	getDeviceSoftwareVersion()	Returns the software version number for the device, for example, the IMEI/SV for GSM p hones.获得软件版本
String	getLine1Number()	Returns the phone number string for line 1, for example, the MSISDN for a GSM phone. 线路1的电话号码
List<NeighboringCel lInfo>	getNeighboringCellInfo()	Returns the neighboring cell information of the device.
String	getNetworkCountryIso()	Returns the ISO country code equivalent of the current registered operator's MCC (Mobile Country Code).获取网络的国家ISO代码
String	getNetworkOperator()	Returns the numeric name (MCC+MNC) of current registered operator. 获取SIM移动国家代码（MCC）和移动网络代码（MNC）
String	getNetworkOperatorName()	Returns the alphabetic name of current registered operator. 获取服务提供商姓名（中国移动、中国联通等）
int	getNetworkType()	Returns a constant indicating the radio technology (network type) currently in use on the device for data transmission. 获取网络类型 NETWORK_TYPE_UNKNOWN　未知网络 NETWORK_TYPE_GPRS NETWORK_TYPE_EDGE　通用分组无线服务（2.5G） NETWORK_TYPE_UMTS 全球移动通信系统（3G） NETWORK_TYPE_HSDPA NETWORK_TYPE_HSUPA NETWORK_TYPE_HSPA NETWORK_TYPE_CDMA CDMA网络（2.1版本） NETWORK_TYPE_EVDO_0 CDMA2000 EV-DO版本0（2.1版本） NETWORK_TYPE_EVDO_A CDMA2000 EV-DO版本A（2.1版本） NETWORK_TYPE_EVDO_B CDMA2000 EV-DO版本B（2.1版本） NETWORK_TYPE_1xRTT CDMA2000 1xRTT（2.1版本） NETWORK_TYPE_IDEN NETWORK_TYPE_LTE NETWORK_TYPE_EHRPD NETWORK_TYPE_HSPAP
int	getPhoneType()	Returns a constant indicating the device phone type. 电话类型 PHONE_TYPE_NONE 未知 PHONE_TYPE_GSM GSM手机 PHONE_TYPE_CDMA CDMA手机（2.1版本） PHONE_TYPE_SIP via SIP手机
String	getSimCountryIso()	Returns the ISO country code equivalent for the SIM provider's country code. 获取SIM卡中国家ISO代码
String	getSimOperator()	Returns the MCC+MNC (mobile country code + mobile network code) of the provider of the SIM.获 得SIM卡中移动国家代码（MCC）和移动网络代码（MNC）
String	getSimOperatorName()	Returns the Service Provider Name (SPN). 获取服务提供商姓名（中国移动、中国联通等）
String	getSimSerialNumber()	Returns the serial number of the SIM, if applicable. SIM卡序列号
int	getSimState()	Returns a constant indicating the state of the device SIM card. SIM卡状态 SIM_STATE_UNKNOWN 　 未知状态 SIM_STATE_ABSENT 　 未插卡 SIM_STATE_PIN_REQUIRED 　 需要PIN码，需要SIM卡PIN码解锁 SIM_STATE_PUK_REQUIRED 　需要PUK码，需要SIM卡PUK码解锁 SIM_STATE_NETWORK_LOCKED 网络被锁定，需要网络PIN解锁 SIM_STATE_READY 　 准备就绪 其中：PIN个人识别码　PUK个人解锁码
String	getSubscriberId()	Returns the unique subscriber ID, for example, the IMSI for a GSM phone. 获得客户标识（IMSI）
String	getVoiceMailAlphaTag()	Retrieves the alphabetic identifier associated with the voice mail number.
String	getVoiceMailNumber()	Returns the voice mail number.
boolean	hasIccCard()
boolean	isNetworkRoaming()	Returns true if the device is considered roaming on the current network, for GSM purposes.
void	listen(PhoneStateListener listener, int events)	Registers a listener object to receive notification of changes in specified telephony states. 侦听电话的呼叫状态。电话管理服务接口支持的侦听类型在PhoneStateListener类中定义。

PhoneStateListener类

Constants

int	LISTEN_CALL_FORWARDING_INDICATOR	Listen for changes to the call-forwarding indicator. 侦听呼叫转移指示器改变事件
int	LISTEN_CALL_STATE	Listen for changes to the device call state. 侦听呼叫状态改变事件
int	LISTEN_CELL_LOCATION	Listen for changes to the device's cell location. Note that this will result in frequent callbacks to the listener.侦听设备位置改变事件
int	LISTEN_DATA_ACTIVITY	Listen for changes to the direction of data traffic on the data connection (cellular).侦听数据连接的流向改变事件
int	LISTEN_DATA_CONNECTION_STATE	Listen for changes to the data connection state (cellular). 侦听数据连接状态改变事件
int	LISTEN_MESSAGE_WAITING_INDICATOR	Listen for changes to the message-waiting indicator. 侦听消息等待指示器改变事件
int	LISTEN_NONE	Stop listening for updates. 停止侦听
int	LISTEN_SERVICE_STATE	Listen for changes to the network service state (cellular). 侦听网络服务状态
int	LISTEN_SIGNAL_STRENGTH	This constant is deprecated. by LISTEN_SIGNAL_STRENGTHS 侦听网络信号强度
int	LISTEN_SIGNAL_STRENGTHS	Listen for changes to the network signal strengths (cellular).

Public Constructors

PhoneStateListener()

Public Methods

void	onCallForwardingIndicatorChanged(boolean cfi)	Callback invoked when the call-forwarding indicator changes.
void	onCallStateChanged(int state, String incomingNumber)	Callback invoked when device call state changes. 处理侦测到的电话呼叫状态的改变事件。通过该回调事件，可以获取来电号码， 而且可以获取电话呼叫状态。即用switch(state){case TelephoneManager.CALL_STATE_……}来判断
void	onCellLocationChanged(CellLocation location)	Callback invoked when device cell location changes.
void	onDataActivity(int direction)	Callback invoked when data activity state changes.
void	onDataConnectionStateChanged(int state)	Callback invoked when connection state changes.
void	onDataConnectionStateChanged(int state, int networkType)	same as above, but with the network type. 处理侦测到的数据连接状态的改变状态。通过该回调函数， 可以获取数据连接状态信息。 数据连接类型 DATA_DISCONNECTED 断开 DATA_CONNECTING 正在连接 DATA_CONNECTED 已连接 DATA_SUSPENDED 已暂停
void	onMessageWaitingIndicatorChanged(boolean mwi)	Callback invoked when the message-waiting indicator changes.
void	onServiceStateChanged(ServiceState serviceState)	Callback invoked when device service state changes. 处理侦测到的服务状态的改变事件。通过该回调函数可以获取服务状态信息。 电话服务状态类型定义在ServiceState类中。
void	onSignalStrengthChanged(int asu)	This method is deprecated. Use onSignalStrengthsChanged(SignalStrength) 处理侦测到的信号强度的改变事件。通过该回调函数，可以获取信号强度类型。
void	onSignalStrengthsChanged(SignalStrength signalStrength)	Callback invoked when network signal strengths changes.

参考文献:
1.李刚老师的Android疯狂讲义
2.相关属性与方法摘自:http://www.linuxidc.com/Linux/2011-10/45049.htm