Android AOSP源码中的工具类

这么多工具类，自己写的时候做下参考

系统

./android/database/DatabaseUtils.java./android/transition/TransitionUtils.java./android/view/animation/AnimationUtils.java./android/view/ViewAnimationUtils.java./android/webkit/URLUtil.java./android/bluetooth/le/BluetoothLeUtils.java./android/gesture/GestureUtils.java./android/text/TextUtils.java./android/text/format/DateUtils.java./android/os/FileUtils.java./android/os/CommonTimeUtils.java./android/net/NetworkUtils.java./android/util/MathUtils.java./android/util/TimeUtils.java./android/util/ExceptionUtils.java./android/util/DebugUtils.java./android/drm/DrmUtils.java./android/media/ThumbnailUtils.java./android/media/ImageUtils.java./android/media/Utils.java./android/opengl/GLUtils.java./android/opengl/ETC1Util.java./android/telephony/PhoneNumberUtils.java

设计和支持库

./design/src/android/support/design/widget/ViewGroupUtils.java./design/src/android/support/design/widget/ThemeUtils.java./design/src/android/support/design/widget/ViewUtils.java./design/lollipop/android/support/design/widget/ViewUtilsLollipop.java./design/base/android/support/design/widget/AnimationUtils.java./design/base/android/support/design/widget/MathUtils.java./design/honeycomb/android/support/design/widget/ViewGroupUtilsHoneycomb.java./v7/recyclerview/src/android/support/v7/widget/helper/ItemTouchUIUtil.java./v7/recyclerview/src/android/support/v7/widget/helper/ItemTouchUIUtilImpl.java./v7/recyclerview/src/android/support/v7/util/MessageThreadUtil.java./v7/recyclerview/src/android/support/v7/util/AsyncListUtil.java./v7/recyclerview/src/android/support/v7/util/ThreadUtil.java./v7/recyclerview/tests/src/android/support/v7/widget/AsyncListUtilLayoutTest.java./v7/recyclerview/tests/src/android/support/v7/util/AsyncListUtilTest.java./v7/recyclerview/tests/src/android/support/v7/util/ThreadUtilTest.java./v7/appcompat/src/android/support/v7/graphics/drawable/DrawableUtils.java./v7/appcompat/src/android/support/v7/widget/DrawableUtils.java./v7/appcompat/src/android/support/v7/widget/ThemeUtils.java./v7/appcompat/src/android/support/v7/widget/ViewUtils.java./v4/tests/java/android/support/v4/graphics/ColorUtilsTest.java./v4/jellybean-mr1/android/support/v4/text/TextUtilsCompatJellybeanMr1.java./v4/jellybean/android/support/v4/app/BundleUtil.java./v4/jellybean/android/support/v4/app/NavUtilsJB.java./v4/java/android/support/v4/app/NavUtils.java./v4/java/android/support/v4/database/DatabaseUtilsCompat.java./v4/java/android/support/v4/graphics/ColorUtils.java./v4/java/android/support/v4/text/TextUtilsCompat.java./v4/java/android/support/v4/util/TimeUtils.java./v4/java/android/support/v4/util/DebugUtils.java./v4/java/android/support/v4/content/res/TypedArrayUtils.java