private void showDialpadFragment(boolean animate) {
//……
final FragmentTransaction ft = getFragmentManager().beginTransaction();
if (dialpadFragment == null) {
dialpadFragment = new DialpadFragment();
ft.add(R.id.dialtacts_container, dialpadFragment, TAG_DIALPAD_FRAGMENT);
} else {
ft.show(dialpadFragment);
}
//……
}
具体实现在 DialpapFragment 中，看到 DialpapFragment 实现了 TextWatcher，TextWatcher 有 3 个重要方法，分别为：beforeTextChanged，onTextChanged 和 afterTextChanged，重点看 afterTextChanged 方法。
DialpadFragment#afterTextChanged
public class DialpadFragment extends Fragment
implements View.OnClickListener,
View.OnLongClickListener,
View.OnKeyListener,
AdapterView.OnItemClickListener,
TextWatcher,
PopupMenu.OnMenuItemClickListener,
DialpadKeyButton.OnPressedListener {
//……
@Override
public void afterTextChanged(Editable input) {
// When DTMF dialpad buttons are being pressed, we delay SpecialCharSequenceMgr sequence,
// since some of SpecialCharSequenceMgr’s behavior is too abrupt for the “touch-down”
// behavior.
if (!digitsFilledByIntent
&& SpecialCharSequenceMgr.handleChars(getActivity(), input.toString(), digits)) {
// A special sequence was entered, clear the digits
digits.getText().clear();
}
if (isDigitsEmpty()) {
digitsFilledByIntent = false;
digits.setCursorVisible(false);
}
if (dialpadQueryListener != null) {
dialpadQueryListener.onDialpadQueryChanged(digits.getText().toString());
}
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leteButtonEnabledState();
}
//……
}
这里调用了 SpecialCharSequenceMgr 辅助工具类的 handleChars 方法，看这个方法。
SpecialCharSequenceMgr#handleChars
public static boolean handleChars(Context context, String input, EditText textField) {
// get rid of the separators so that the string gets parsed correctly
String dialString = PhoneNumberUtils.stripSeparators(input);
if (handleDeviceIdDisplay(context, dialString)
|| handleRegulatoryInfoDisplay(context, dialString)
|| handlePinEntry(context, dialString)
|| handleAdnEntry(context, dialString, textField)
|| handleSecretCode(context, dialString)) {
return true;
}
if (MotorolaUtils.handleSpecialCharSequence(context, input)) {
return true;
}
return false;
}
handleChars 方法中，会对各种特殊的 secret code 进行匹配处理，这里我们看 handleSecretCode。
SpecialCharSequenceMgr#handleSecretCode
static boolean handleSecretCode(Context context, String input) {
// Secret code specific to OEMs should be handled first.
if (TranssionUtils.isTranssionSecretCode(input)) {
TranssionUtils.handleTranssionSecretCode(context, input);
return true;
}
// Secret codes are accessed by dialing #### or “*#<code_starting_with_number>#”
if (input.length() > 8 && input.startsWith("##") && input.endsWith("##")) {
String secretCode = input.substring(4, input.length() - 4);
TelephonyManagerCompat.handleSecretCode(context, secretCode);
return true;
}
return false;
}
再看下 TelephonyManagerCompat.handleSecretCode 方法。
TelephonyManagerCompat#handleSecretCode
public static void handleSecretCode(Context context, String secretCode) {
// Must use system service on O+ to avoid using broadcasts, which are not allowed on O+.
if (BuildCompat.isAtLeastO()) {
if (!TelecomUtil.isDefaultDialer(context)) {
LogUtil.e(
“TelephonyManagerCompat.handleSecretCode”,
“not default dialer, cannot send special code”);
return;
}
context.getSystemService(TelephonyManager.class).sendDialerSpecialCode(secretCode);
} else {
// System service call is not supported pre-O, so must use a broadcast for N-.
Intent intent =
new Intent(SECRET_CODE_ACTION, Uri.parse(“android_secret_code://” + secretCode));
context.sendBroadcast(intent);
}
}
可以看到在拨号中接收到*#*#<code>#*#* 这样的指令时，程序会对外发送广播，这就意味着我们能够接收这个广播然后可以做我们想做的事情。
接下来我们看看这个接受广播代码是怎么写。
