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android打电话流程_android 11 拨打电话

作者：神奇cpp | 2024-08-16 12:51:25

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android 11 拨打电话

Android打电话流程

1. 所有流程的起点是从拨号后按下拨号键开始，此步的代码在/android sourcecode/packages/Contacts/src/com/android/contacts/目录的TwelveKeyDialer.java文件中，相关代码如下：

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1 dialButtonPressed() {

2 .........

3 final String number = mDigits.getText().toString();

4 startActivity(newDialNumberIntent(number));

5 mDigits.getText().clear();

6 finish();

7 }

dialButtonPressed() {

.........

final String number = mDigits.getText().toString();

startActivity(newDialNumberIntent(number));

mDigits.getText().clear();

finish();

}代码中newDialNumberIntent()方法定义如下：

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8 private Intent newDialNumberIntent(String number) {

9 final Intent intent = new Intent(Intent.ACTION_CALL_PRIVILEGED, Uri.fromParts("tel", number, null));

10 .............

11 }

private Intent newDialNumberIntent(String number) { final Intent intent = new Intent(Intent.ACTION_CALL_PRIVILEGED, Uri.fromParts("tel", number, null)); ............. }从newDialNumberIntent的定义可以看出，当拨号键按下以后，TwelveKeyDial会启动一个特定的组件，该组件的ACTION为：ACTION_CALL_PRIVILEGED,经过查找，该ACTION启动的组件是目录下：/android sourcecode/packeges/Phone/的一个文件，在该文件下的AndroidMenifest.xml中可以查到:“ACTION_CALL_PRIVILEGED”启动的Activity的名字是：PrivilegedOutgoingCallBroadcast,但是我们到/android sourcecode/packages/Phone/src/....目下并找不到该文件，因为该文件在AndroidMenifest.xml中标记有点特殊：

<activity-alias />,这个标签的意思是这个Activity是另一个Activity的别名，真实的Activity在标签中用“android:targetActivity = OutgoingCallBroadcast”标出，所以 “ACTION_CALL_PRIVILEGED”启动的 PrivilegedOutgoingCallBroadcast 所对应的真实“身份”是 “OutgoingCallBroadcast”。

2. 这个时候电话的数据已经流到OutgoingCallBroadcast.java中了。

在OutgoingCallBroadcast.java的onCreate()方法中有：

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12 <pre name="code" class="java">protected void onCreate(Bundle icicle) {

13 .......

14 Intent intent = getIntent();

15 ........

16 String action = intent.getAction();

17 .......

18 final boolean emergencyNum = (number != null) && PhoneNumUtils.isEmergencyNumber(number);//判断号码是否是紧急号码

19 .......

20 if (Intent.ACTION_CALL_PRIVILEGED.equals(action)) ｛

21 action = emergencyNum ? Intent.ACTION_CALL_EMERGENCY : Intent.ACTION_CALL;

22 intent.setAction(action);

23 }

24 .......

25 intent.setClass(this, InCallScreen.class);

26 startActivity(intent);

27 }

<pre name="code" class="java">protected void onCreate(Bundle icicle) { .......Intent intent = getIntent();........String action = intent.getAction(); ....... final boolean emergencyNum = (number != null) && PhoneNumUtils.isEmergencyNumber(number);//判断号码是否是紧急号码 .......if (Intent.ACTION_CALL_PRIVILEGED.equals(action)) ｛ action = emergencyNum ? Intent.ACTION_CALL_EMERGENCY : Intent.ACTION_CALL; intent.setAction(action);}.......intent.setClass(this, InCallScreen.class); startActivity(intent);}

在这个方法中，判断如果所收到的ACTION是“ACTION_CALL_PRIVILEGED”，那么根据所输入的号码是否是紧急号码进行转换，如果是紧急号码，则ACTION ＝ Intent.ACTION_CALL_EMERGENCY,否则ACTION ＝ Intent.ACTION_CALL,并启动转换Activity ：InCallScreen.java

3. InCallScreen.java依然在目录/packeges/Phone/src/com/android/phone下。

InCallScreen的onCreate中调用initInCallScreen初始化打电话界面，并调用registerForPhoneStates注册电话状态监听.

在onNewIntent()方法中有：

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28 protected void onNewIntent(Intent intent) {

29 ..........

30 String action = intent.getAction();

31 ..........

32 else if (action.equals(Intent.ACTION_CALL) || action.equals(Intent.ACTION_CALL_EMERGENCY)) {

33 ..........

34 InCallInitStatus status = placeCall(intent);

35 }

36 }

37 //placeCall

38 private InCallInitStatus placeCall(Intent intent) {

39 ..............

40 int callStatus = PhoneUtils.placeCall(........);

41 }

protected void onNewIntent(Intent intent) { ..........String action = intent.getAction();.......... else if (action.equals(Intent.ACTION_CALL) || action.equals(Intent.ACTION_CALL_EMERGENCY)) { ..........InCallInitStatus status = placeCall(intent);}}//placeCall private InCallInitStatus placeCall(Intent intent) {.............. int callStatus = PhoneUtils.placeCall(........); }InCallScreen.java中的placeCall方法调用PhoneUtils.java文件的placeCall方法。

4. PhoneUtils.java依然在目录/packeges/Phone/src/com/android/phone下。

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42 public static int placeCall(...) {

43 Connection connection;

44 connection = PhoneApp.getInstance().mCM.dial(phone, numberToDial);

45 }

public static int placeCall(...) { Connection connection; connection = PhoneApp.getInstance().mCM.dial(phone, numberToDial); }继续追踪，在PhoneApp.java中发现，mCM是CallManager.java类的一个对象，而CallManager.java是属于frameworks层的，所以，这个时候数据流已经进入frameworks.

5. 进入/frameworks/base/telephony/java/com/android/internal/telephony目录。

在CallManager.java的dial()方法中，有：

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46 <pre name="code" class="java">public Connection dial(Phone phone, String dialNumber) throws CallStateException {

47 Phone basePhone = getPhoneBase(phone);

48 Connection result;

49 result = basePhone.dial(dialString);

50 ........

51 }

52 private static Phone getPhoneBase(Phone phone) {

53 if (phone instanceof PhoneProxy) {

54 return phone.getForegroundCall().getPhone();

55 }

56 return phone;

57 }

<pre name="code" class="java">public Connection dial(Phone phone, String dialNumber) throws CallStateException { Phone basePhone = getPhoneBase(phone);Connection result; result = basePhone.dial(dialString); ........}private static Phone getPhoneBase(Phone phone) { if (phone instanceof PhoneProxy) { return phone.getForegroundCall().getPhone(); }return phone;}

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58 继续追踪会发现：

继续追踪会发现：

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59 PhoneBase.java抽象类实现了接口Phone.java,而GSMPhone.java又实现了抽象类PhoneBase,所以:

PhoneBase.java抽象类实现了接口Phone.java,而GSMPhone.java又实现了抽象类PhoneBase,所以:

上述代码中：phone.getForegroundCall()实际相当于GSMPhone对象执行了getForegroundCall()方法。

6. 继续追踪GSMPhone.java,该类位于/frameworks/base/telephony/java/com/android/internal/telephony/gsm/下。

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60 GSMPhone.java：

61 GsmCallTracker mCT;

62 public GsmCall getForegroundCall() {

63 return mCT.foregroundCall;

64 }

GSMPhone.java：GsmCallTracker mCT; public GsmCall getForegroundCall() {return mCT.foregroundCall; }可以看出getForegroundCall()函数继续调用GsmCallTracker.java的foregroundCall属性。

7.GsmCallTracker.java位于/frameworks/base/telephony/java/com/android/internal/telephony/gsm/下.

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65 GsmCallTracker.java:

66 GSMCall foregroundCall = new GSMCall(this);

GsmCallTracker.java: GSMCall foregroundCall = new GSMCall(this);

打开GSMCall.java,找到getPhone()方法，发现：

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67 GSMCallTracker owner;

68 public Phone getPhone() {

69 return owner.phone;

70 }

GSMCallTracker owner; public Phone getPhone() {return owner.phone;}

而在GSMCallTracker.java中有如下声明：

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71 GSMPhone phone;

GSMPhone phone;

到此，我们得出一下结论：第5部分标记红色的代码所返回的就是GSMPhone的对象，进一步可以得出，第5部分蓝色标记的代码即是调用了GSMPhone对象的dial方法。

8. 在GSMPhone.java中：

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72 GSMCallTracker mCT;

73 public Connection dial(String dialString) throws CallStateException {

74 return dial(dialString, null);

75 }

77 public Connection dial(String dialString, UUSInfo uusInfo) throws CallStateException {

78 .......

79 mCT.dial(.......);

80 }

GSMCallTracker mCT; public Connection dial(String dialString) throws CallStateException { return dial(dialString, null);} public Connection dial(String dialString, UUSInfo uusInfo) throws CallStateException { .......mCT.dial(.......);}

继续调用GSMCallTracker.java中的dial()方法：

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81 GSMCallTracker.java：

82 GSMCallTracker(GSMPhone phone) {

83 cm = phone.mCM;

84 }

85 Connection dial(String dialString, int clirMode, UUSInfo uusInfo) {

86 cm.dial(........);

87 }

GSMCallTracker.java： GSMCallTracker(GSMPhone phone) {cm = phone.mCM;} Connection dial(String dialString, int clirMode, UUSInfo uusInfo) { cm.dial(........);}追踪mCM,发现 :

public CommandsInterface mCM;

所以GSMCallTracker持有CommandsInterface对象，即RIL.Java类的对象，所以"cm.dial(....)"即是调用RIL类对象的dial()方法。

9. RIL.java

BOSS出现。

RIL对象负责把客户端的通话请求按照一定的格式发送给"rild"socket,至此，请求过程完毕。

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