upload android base code part1

android/frameworks/support/development/refaster/IsAtLeastO.java

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+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import android.os.Build.VERSION;
+import android.support.v4.os.BuildCompat;
+
+import com.google.errorprone.refaster.annotation.AfterTemplate;
+import com.google.errorprone.refaster.annotation.AlsoNegation;
+import com.google.errorprone.refaster.annotation.BeforeTemplate;
+
+/**
+ * Replace usages of BuildCompat.isAtLeastO() with SDK_INT check.
+ */
+public class IsAtLeastO {
+    @BeforeTemplate
+    boolean usingAtLeastO() {
+        return BuildCompat.isAtLeastO();
+    }
+
+    @AfterTemplate
+    @AlsoNegation
+    boolean optimizedMethod() {
+        return VERSION.SDK_INT >= 26;
+    }
+}

android/frameworks/support/development/refaster/README

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+Author: aurimas@google.com
+Updated: 6/6/2017
+
+Instructions on how to compile and apply refaster rules to support library
+
+0. Download error-prone and refaster jars
+http://errorprone.info/docs/refaster will have up to date instructions
+
+1. Compile the refaster rule (in this example IsAtLeastO.java)
+java -cp /path/to/android.jar:/path/to/support-compat.jar:javac-9-dev-r3297-4.jar:error_prone_refaster-2.0.18.jar com.google.errorprone.refaster.RefasterRuleCompiler IsAtLeastO.java --out `pwd`/myrule.refaster
+
+2. Update build to use the refaster rule
+Add compiler args to error-prone in SupportLibraryPlugin.groovy
+'-XepPatchChecks:refaster:/path/to/refaster/myrule.refaster',
+'-XepPatchLocation:' + project.projectDir
+
+3. Compile support library using the refaster rule
+./gradlew assembleErrorProne
+
+4. Apply patches
+error-prone will produce patch files like "design/error-prone.patch" and to apply them, cd into the
+directory e.g. "design" and then run:
+patch -p0 -u -i error-prone.patch
+
+5. Rules have been applied! Celebrate!