java.lang.SecurityException: No permission to write APN settings问题的定位小结
在实际开发过程中，某模块访问TelephonyProvider时，问题报下面的异常，而且报的频率还挺高，今天特别抽空找了一下。
01-11 19:23:49.301: E/DatabaseUtils(902): Writing exception to parcel 01-11 19:23:49.301: E/DatabaseUtils(902): java.lang.SecurityException: No permission to write APN settings: Neither user 10017 nor current process has android.permission.WRITE_APN_SETTINGS. 01-11 19:23:49.301: E/DatabaseUtils(902): at android.app.ContextImpl.enforce(ContextImpl.java:1646) 01-11 19:23:49.301: E/DatabaseUtils(902): at android.app.ContextImpl.enforceCallingOrSelfPermission(ContextImpl.java:1675) 01-11 19:23:49.301: E/DatabaseUtils(902): at com.android.providers.telephony.TelephonyProvider.checkPermission(TelephonyProvider.java:784) 01-11 19:23:49.301: E/DatabaseUtils(902): at com.android.providers.telephony.TelephonyProvider.query(TelephonyProvider.java:511) 01-11 19:23:49.301: E/DatabaseUtils(902): at android.content.ContentProvider.query(ContentProvider.java:744) 01-11 19:23:49.301: E/DatabaseUtils(902): at android.content.ContentProvider$Transport.query(ContentProvider.java:199) 01-11 19:23:49.301: E/DatabaseUtils(902): at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:114) 01-11 19:23:49.301: E/DatabaseUtils(902): at android.os.Binder.execTransact(Binder.java:388) 01-11 19:23:49.301: E/DatabaseUtils(902): at dalvik.system.NativeStart.run(Native Method)
根据“user 10017”这个关键字，比较靠谱，使用如下命令：
在CMD中输入 adb shell，然后再 su 到root，再输入下面的命令：
cat /data/system/packages.xml | grep 10017得到如下的结果：
<package name="com.zhao3546.testcenter" codePath="/system/app/testcenter.apk" nativeLibraryPath="/data/app-lib/testcenter_1.0.15" flags="573007" ft="14380ce7678" it="143321d14ab" ut="14380d07834" version="200101" userId="10017">
找到了模块，解决就比较简单了，直接给该模块加一下“android.permission.WRITE_APN_SETTINGS”的权限即可。