在android的手机里,进入拨号程序,输入*#*#4636#*#* 能够看到一个测试应用。java
查看Phone的源代码,有一个函数专门处理*#*# 开头,#*#*结尾的拨号字符串。android
SpecialCharSequenceMgr.javaapp
/**
* Handles secret codes to launch arbitrary activities in the form of *#*#<code>#*#*.
* If a secret code is encountered an Intent is started with the android_secret_code://<code>
* URI.
*
* @param context the context to use
* @param input the text to check for a secret code in
* @return true if a secret code was encountered
*/
static private boolean handleSecretCode(Context context, String input) {
// Secret codes are in the form *#*#<code>#*#*
int len = input.length();
if (len > 8 && input.startsWith("*#*#") && input.endsWith("#*#*")) {
Intent intent = new Intent(Intents.SECRET_CODE_ACTION,
Uri.parse("android_secret_code://" + input.substring(4, len - 4)));
context.sendBroadcast(intent);
return true;
}
return false;
}ide
这样,根据android_secret_code就能够查到系统所用的全部隐形字符串。函数
b090@test-desktop:~/Android_Code$ find . -name "AndroidManifest.xml" | xargs grep android_secret_code
./packages/providers/CalendarProvider/AndroidManifest.xml: <data android:scheme="android_secret_code" android:host="225" />
./packages/apps/Settings/AndroidManifest.xml: <data android:scheme="android_secret_code" android:host="4636" />
./packages/apps/VoiceDialer/AndroidManifest.xml: <data android:scheme="android_secret_code" android:host="8351" />
./packages/apps/VoiceDialer/AndroidManifest.xml: <data android:scheme="android_secret_code" android:host="8350" />测试
能够看到,系统代码里面有225/4636/8351/8350隐形字符串。.net
若是用户想要开发应用程序支持特殊的隐形字串,只须要照猫画虎在AndroidManifest.xml添加Filter就能够了。code
例如:orm
<receiver android:name="TestingSettingsBroadcastReceiver">
<intent-filter>
<action android:name="android.provider.Telephony.SECRET_CODE" />
<data android:scheme="android_secret_code" android:host="4636" />
</intent-filter>
</receiver>xml
有没有什么方法,能看看到系统所支持的intent以及其所支持的参数呢?