做的好的农产品网站有哪些,头像在线设计生成器,爱给网官网免费素材,搭建电商网站前言喜欢的小伙伴欢迎关注#xff0c;我会定期分享Android知识点及解析#xff0c;还会不断更新的BATJ面试专题#xff0c;欢迎大家前来探讨交流#xff0c;如有好的文章也欢迎投稿。什么是暗码#xff1f;在拨号盘中输入*#*##*#*后#xff0c;APP 可以监控到这些输入我会定期分享Android知识点及解析还会不断更新的BATJ面试专题欢迎大家前来探讨交流如有好的文章也欢迎投稿。什么是暗码在拨号盘中输入*#*##*#*后APP 可以监控到这些输入然后做相应的动作比如启动应用是不是有点骚。下面看下这个骚操作是如何实现的。效果预览源码DialtactsActivity#showDialpadFragmentDialtactsActivity 中有个 showDialpadFragment 方法用来加载显示拨号盘因此入口就从 showDialpadFragment 看起基于 Android P 分析。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 TextWatcherTextWatcher 有 3 个重要方法分别为beforeTextChangedonTextChanged 和 afterTextChanged重点看 afterTextChanged 方法。DialpadFragment#afterTextChangedpublic class DialpadFragment extends Fragmentimplements View.OnClickListener,View.OnLongClickListener,View.OnKeyListener,AdapterView.OnItemClickListener,TextWatcher,PopupMenu.OnMenuItemClickListener,DialpadKeyButton.OnPressedListener {//……Overridepublic void afterTextChanged(Editable input) {// When DTMF dialpad buttons are being pressed, we delay SpecialCharSequenceMgr sequence,// since some of SpecialCharSequenceMgrs behavior is too abrupt for the touch-down// behavior.if (!digitsFilledByIntent SpecialCharSequenceMgr.handleChars(getActivity(), input.toString(), digits)) {// A special sequence was entered, clear the digitsdigits.getText().clear();}if (isDigitsEmpty()) {digitsFilledByIntent false;digits.setCursorVisible(false);}if (dialpadQueryListener ! null) {dialpadQueryListener.onDialpadQueryChanged(digits.getText().toString());}updateDeleteButtonEnabledState();}//……}这里调用了 SpecialCharSequenceMgr 辅助工具类的 handleChars 方法看这个方法。SpecialCharSequenceMgr#handleCharspublic static boolean handleChars(Context context, String input, EditText textField) {// get rid of the separators so that the string gets parsed correctlyString 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#handleSecretCodestatic 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 *##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#handleSecretCodepublic 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*#*##*#* 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。应用首先在 AndroidManifest 文件中注册广播接收器。android:name.SecretCodeReceiver接收广播启动应用。public class SecretCodeReceiver extends BroadcastReceiver {Overridepublic void onReceive(Context context, Intent intent) {if (intent ! null SECRET_CODE_ACTION.equals(intent.getAction())){Intent i new Intent(Intent.ACTION_MAIN);i.setClass(context, MainActivity.class);i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(i);}}}这样只要在拨号中输入*#*#1010#*#*就能启动相应的应用程序OK收功。觉得文章不错的小伙伴帮忙点点赞加关注哦 有什么问题的话也欢迎大家前来探讨交流。
