更新了frameworks\base\core\java\android\provider\Settings.java 下的接口，编译报：
FAILED: out/target/common/docs/api-stubs-timestamp out/target/common/obj/PACKAGING/public_api.txt out/target/common/obj/PACKAGING/removed.txt
/bin/bash out/target/common/docs/api-stubs-timestamp.rsp解决方法：
make clean
make update-api
make