andoird拨号流程简单解析

android拨号分两种，一种经过拨号器，输入号码，然后按CALL键拨打出去，还有一种经过联系人或者通话记录拨打出去。

第一种方式：TwelveKeyDialer.java中的placeCall()

void placeCall() {
final String number = mDigits.getText().toString();
if (number == null || !TextUtils.isGraphic(number)) {
// There is no number entered.
playTone(ToneGenerator.TONE_PROP_NACK);
return;
}
Intent intent = new Intent(Intent.ACTION_CALL_PRIVILEGED,
Uri.fromParts("tel", number, null));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
mDigits.getText().clear();
finish();
}

定一个一个ACTION_CALL_PRIVILEGED，自动匹配上OutgoingCallBroadcaster

if (Intent.ACTION_CALL_PRIVILEGED.equals(action)) {
action = emergencyNumber
? Intent.ACTION_CALL_EMERGENCY
: Intent.ACTION_CALL;
intent.setAction(action);
}

区分号码是否为紧急号码，是紧急号码的话立即起一个InCallScreen的Activity，不是的话发出广播，转发一个拨号Intent，

Intent broadcastIntent = new Intent(Intent.ACTION_NEW_OUTGOING_CALL);
if (number != null) broadcastIntent.putExtra(Intent.EXTRA_PHONE_NUMBER, number);
broadcastIntent.putExtra(EXTRA_ALREADY_CALLED, callNow);
broadcastIntent.putExtra(EXTRA_ORIGINAL_URI, intent.getData().toString());
if (LOGV) Log.v(TAG, "Broadcasting intent " + broadcastIntent + ".");
sendOrderedBroadcast(broadcastIntent, PERMISSION, null, null,
Activity.RESULT_OK, number, null);

而OutgoingReceiver接收到广播以后，才起一个InCallScreen

Intent newIntent = new Intent(Intent.ACTION_CALL, uri);
newIntent.putExtra(Intent.EXTRA_PHONE_NUMBER, number);
newIntent.setClass(context, InCallScreen.class);
newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(newIntent);

这样，这个拨打的过程就完成了。

如果在历史通话记录界面，响应用户的click请求

protected void onListItemClick(ListView l, View v, int position, long id) {
static final int COLUMN_INDEX_NUMBER = 4; | Intent intent = new Intent(this, CallDetailActivity.class);
| intent.setData(ContentUris.withAppendedId(CallLog.Calls.CONTENT_URI, id));
@Override | startActivity(intent);
protected void onCreate(Bundle icicle) { | }
起一个CallDetailActivity，在CallDetailActivity界面，如果当前电话是空闲的，直接发一个ACTION_CALL_PRIVILEGED给OutgoingCallBroadcaster

TelephonyManager tm = (TelephonyManager) |
getSystemService(Context.TELEPHONY_SERVICE); | int callType = cursor.getInt(CALL_TYPE_COLUMN_INDEX);
if (tm.getCallState() == TelephonyManager.CALL_STATE_IDLE) { | if (!number.startsWith("+") &&
Intent callIntent = new Intent(Intent.ACTION_CALL_PRIVILEGED, | (callType == Calls.INCOMING_TYPE
Uri.fromParts("tel", mNumber, null)); | || callType == Calls.MISSED_TYPE)) {
startActivity(callIntent);

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