Android源码
AOSPXRef（7-12）AndroidXRef（1-9）https://android.googlesource.com/platform/frameworks/base/
权限
Manifest.permission | Android Developershttp://androidxref.com/8.0.0_r4/xref/frameworks/base/core/res/AndroidManifest.xml
拨打电话 权限&接口
权限：android.permission.CALL_PHONE接口：android.telephony.TelephonyManager.call(String, String)
权限
Manifest.permission | Android Developers
http://androidxref.com/8.0.0_r4/xref/frameworks/base/core/res/AndroidManifest.xml
接口
android.telephony.TelephonyManager.call(String, String)
http://androidxref.com/8.0.0_r4/xref/frameworks/base/telephony/java/android/telephony/TelephonyManager.java
https://android.googlesource.com/platform/frameworks/base/+/refs/heads/android-s-beta-4/telephony/java/android/telephony/TelephonyManager.java
