Allow google dialer code to be compiled against M and N SDKs

+ Class SdkSelectionUtils to provides information of the SDK the app is
  build against.
  Specifically, information that change when the TARGET_N_SDK build flag is
  set in the makefile.
  This is not related to the targetSdkVersion value in AndroidManifest.xml.

Bug:26330692
Change-Id: Ie9e7d734964b5da930d33f69650643bfd2c1e178
diff --git a/src-N/com/android/dialer/SdkSelectionUtils.java b/src-N/com/android/dialer/SdkSelectionUtils.java
new file mode 100644
index 0000000..ae7a631
--- /dev/null
+++ b/src-N/com/android/dialer/SdkSelectionUtils.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+package com.android.dialer;
+
+/**
+ * Provides information for the SDK the app is built against.
+ * Specifically, information that change when the TARGET_N_SDK build flag is set in the makefile.
+ * This is not related to the targetSdkVersion value in AndroidManifest.xml.
+ *
+ * Usage case will be branching test code in src/, instead of swapping between src-N and src-pre-N.
+ */
+public class SdkSelectionUtils {
+
+    /**
+     * Whether the app is build against N SDK.
+     *
+     * Since Build.VERSION.SDK_INT remains 23 on N SDK for now, this is currently the only way to
+     * check if we are building with N SDK or other.
+     */
+    public static final boolean TARGET_N_SDK = true;
+}
diff --git a/src-pre-N/com/android/dialer/SdkSelectionUtils.java b/src-pre-N/com/android/dialer/SdkSelectionUtils.java
new file mode 100644
index 0000000..7e36b33
--- /dev/null
+++ b/src-pre-N/com/android/dialer/SdkSelectionUtils.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+package com.android.dialer;
+
+/**
+ * Provides information for the SDK the app is built against.
+ * Specifically, information that change when the TARGET_N_SDK build flag is set in the makefile.
+ * This is not related to the targetSdkVersion value in AndroidManifest.xml.
+ *
+ * Usage case will be branching test code in src/, instead of using src-N/ and src-pre-N/
+ */
+public class SdkSelectionUtils {
+
+    /**
+     * Whether the app is build against N SDK.
+     *
+     * Since Build.VERSION.SDK_INT remains 23 on N SDK for now, this is currently the only way to
+     * check if we are building with N SDK or other.
+     */
+    public static final boolean TARGET_N_SDK = false;
+}
diff --git a/tests/src-N/com/android/dialer/SdkSelectionUtilsTest.java b/tests/src-N/com/android/dialer/SdkSelectionUtilsTest.java
new file mode 100644
index 0000000..2950ea0
--- /dev/null
+++ b/tests/src-N/com/android/dialer/SdkSelectionUtilsTest.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+
+package com.android.dialer;
+
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+
+// @formatter:off
+/**
+ * Run test with
+ * adb shell am instrument -e class com.android.dialer.SdkSelectionUtilsTest -w com.google.android.dialer.tests/android.test.InstrumentationTestRunner
+ */
+// @formatter:on
+@SmallTest
+public class SdkSelectionUtilsTest extends AndroidTestCase {
+
+    public void testTargetNSdk_True() {
+        assertTrue(SdkSelectionUtils.TARGET_N_SDK);
+    }
+}
\ No newline at end of file
diff --git a/tests/src-pre-N/com/android/dialer/SdkSelectionUtilsTest.java b/tests/src-pre-N/com/android/dialer/SdkSelectionUtilsTest.java
new file mode 100644
index 0000000..595f1cc
--- /dev/null
+++ b/tests/src-pre-N/com/android/dialer/SdkSelectionUtilsTest.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+
+package com.android.dialer;
+
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+
+// @formatter:off
+/**
+ * Run test with
+ * adb shell am instrument -e class com.android.dialer.SdkSelectionUtilsTest -w com.google.android.dialer.tests/android.test.InstrumentationTestRunner
+ */
+// @formatter:on
+@SmallTest
+public class SdkSelectionUtilsTest extends AndroidTestCase {
+
+    public void testTargetNSdk_False() {
+        assertFalse(SdkSelectionUtils.TARGET_N_SDK);
+    }
+}
\ No newline at end of file