Android应用开发之PhoneStateListener 的使用

这两天在做翻转静音的功能，需要用到PhoneStateListener，以前只是知道有这么个东西，没有具体用过

包含此类的包是：android.telephony.PhoneStateListener

 

由于StatusBar中用到了PhoneStateListener中较多的内容，索性研究了一下StatusBarPolicy.java

76 /**

77  * This class contains all of the policy about which icons are installed in the status

78  * bar at boot time.  In reality, it should go into the android.policy package, but

79  * putting it here is the first step from extracting it.

80  */

services/java/com/android/server/status/StatusBarPolicy.java

 

 

1、首先需要通过TelephonyManager来注册要监听的状态，状态定义在类PhoneStateListener中，如下所示

1)   LISTEN_CALL_FORWARDING_INDICATOR      Listen for changes to the call-forwarding indicator.

Requires Permission: READ_PHONE_STATE

2)   LISTEN_CALL_STATE                                      Listen for changes to the device call state.

Requires Permission: READ_PHONE_STATE

3)   LISTEN_CELL_LOCATION                               Listen for changes to the device's cell location. Note that this

                                                                            will result in frequent callbacks to the listener.

Requires Permission: ACCESS_COARSE_LOCATION

If you need regular location updates but want more control over the update interval or location precision, you can set up a listener through the location manager instead.

4)   LISTEN_DATA_ACTIVITY                                 Listen for changes to the direction of data traffic on the data

                                                                            connection (cellular).

Requires Permission: READ_PHONE_STATE Example: The status bar uses this to display the appropriate data-traffic icon.

5)   LISTEN_DATA_CONNECTION_STATE              Listen for changes to the data connection state (cellular).

6)   LISTEN_MESSAGE_WAITING_INDICATOR       Listen for changes to the message-waiting indicator.

Requires Permission: READ_PHONE_STATE

Example: The status bar uses this to determine when to display the voicemail icon.

7)   LISTEN_NONE                                                Stop listening for updates.

8)   LISTEN_SERVICE_STATE                                Listen for changes to the network service state (cellular).

9)   LISTEN_SIGNAL_STRENGTH                           This constant is deprecated. by LISTEN_SIGNAL_STRENGTHS

10) LISTEN_SIGNAL_STRENGTHS                         Listen for changes to the network signal strengths (cellular).

Example: The status bar uses this to control the signal-strength icon

 

 

StatusBarPolicy中的注册代码如下所示：

438         // register for phone state notifications.

439         ((TelephonyManager)mContext.getSystemService(Context.TELEPHONY_SERVICE))

440                 .listen(mPhoneStateListener,

441                           PhoneStateListener.LISTEN_SERVICE_STATE

442                         | PhoneStateListener.LISTEN_SIGNAL_STRENGTHS

443                         | PhoneStateListener.LISTEN_CALL_STATE

444                         | PhoneStateListener.LISTEN_DATA_CONNECTION_STATE

445                         | PhoneStateListener.LISTEN_DATA_ACTIVITY);

 

当不需要再继续监听上述状态时，通常需要注销掉

// unregister for phone state notifications.

((TelephonyManager)mContext.getSystemService(Context.TELEPHONY_SERVICE))

        .listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);

 

 

2、定义mPhoneStateListener，以内部匿名类的方式定义

885     private PhoneStateListener mPhoneStateListener = new PhoneStateListener() {

886         @Override

887         public void onSignalStrengthsChanged(SignalStrength signalStrength) {

888             mSignalStrength = signalStrength;

889             updateSignalStrength();

890         }

891

892         @Override

893         public void onServiceStateChanged(ServiceState state) {

894             mServiceState = state;

895             updateSignalStrength();

896             updateCdmaRoamingIcon(state);

897             updateDataIcon();

898         }

899

900         @Override

901         public void onCallStateChanged(int state, String incomingNumber) {

902             updateCallState(state);

903             // In cdma, if a voice call is made, RSSI should switch to 1x.

904             if (isCdma()) {

905                 updateSignalStrength();

906             }

907         }

908

909         @Override

910         public void onDataConnectionStateChanged(int state, int networkType) {

911             mDataState = state;

912             updateDataNetType(networkType);

913             updateDataIcon();

914         }

915

916         @Override

917         public void onDataActivity(int direction) {

918             mDataActivity = direction;

919             updateDataIcon();

920         }

921     };

 

1) public void onSignalStrengthsChanged(SignalStrength signalStrength)

// Callback invoked when network signal strengths changes.

通过函数updateSignalStrength更新StatusBar上的信号图标

2) public void onServiceStateChanged(ServiceState state)

// Callback invoked when device service state changes.

通过ServiceState返回当前服务状态，有如下四种状态

STATE_EMERGENCY_ONLY       The phone is registered and locked. Only emergency numbers are allowed.

STATE_IN_SERVICE                  Normal operation condition, the phone is registered with an operator either in

                                                home network or in roaming.

STATE_OUT_OF_SERVICE        Phone is not registered with any operator, the phone can be currently searching a

                                                new operator to register to, or not searching to registration at all, or registration

                                                is denied, or radio signal is not available.

STATE_POWER_OFF                 Radio of telephony is explicitly powered off.

 

同时还可以获取到以下信息

Service state: IN_SERVICE, OUT_OF_SERVICE, EMERGENCY_ONLY, POWER_OFF

Roaming indicator

Operator name, short name and numeric id

Network selection mode

 

StatusBarPolicy根据上面四种状态封装了如下函数，用来判断当前是否有服务

960     private boolean hasService() {

961         if (mServiceState != null) {

962             switch (mServiceState.getState()) {

963                 case ServiceState.STATE_OUT_OF_SERVICE:

964                 case ServiceState.STATE_POWER_OFF:

965                     return false;

966                 default:

967                     return true;

968             }

969         } else {

970             return false;

971         }

972     }

3) public void onCallStateChanged(int state, String incomingNumber)

// Callback invoked when device call state changes

用来更新来电图标，其中state有三种状态，如下

public static final int CALL_STATE_IDLE

Since: API Level 1

Device call state: No activity.

Constant Value: 0 (0x00000000)

public static final int CALL_STATE_OFFHOOK

Since: API Level 1

Device call state: Off-hook. At least one call exists that is dialing, active, or on hold, and no calls are ringing or waiting.

Constant Value: 2 (0x00000002)

public static final int CALL_STATE_RINGING

Since: API Level 1

Device call state: Ringing. A new call arrived and is ringing or waiting. In the latter case, another call is already active.

Constant Value: 1 (0x00000001)

4) public void onDataConnectionStateChanged(int state, int networkType)

// Callback invoked when connection state changes

用来控制是否显示有移动网络数据交互，其中state有四种状态，如下

public static final int DATA_CONNECTED

Since: API Level 1

Data connection state: Connected. IP traffic should be available.

Constant Value: 2 (0x00000002)

public static final int DATA_CONNECTING

Since: API Level 1

Data connection state: Currently setting up a data connection.

Constant Value: 1 (0x00000001)

public static final int DATA_DISCONNECTED

Since: API Level 1

Data connection state: Disconnected. IP traffic not available.

Constant Value: 0 (0x00000000)

public static final int DATA_SUSPENDED

Since: API Level 1

Data connection state: Suspended. The connection is up, but IP traffic is temporarily unavailable. For example, in a 2G network, data activity may be suspended when a voice call arrives.

Constant Value: 3 (0x00000003)

5) public void onDataActivity(int direction)

// Callback invoked when data activity state changes.

用来控制显示数据传输的图标

918             mDataActivity = direction;

1115                     switch (mDataActivity) {

1116                         case TelephonyManager.DATA_ACTIVITY_IN:

1117                             iconId = mDataIconList[1];

1118                             break;

1119                         case TelephonyManager.DATA_ACTIVITY_OUT:

1120                             iconId = mDataIconList[2];

1121                             break;

1122                         case TelephonyManager.DATA_ACTIVITY_INOUT:

1123                             iconId = mDataIconList[3];

1124                             break;

1125                         default:

1126                             iconId = mDataIconList[0];

1127                             break;