Add UsageStatsManager#isAppInactive test

Tests UsageStatsManager#isAppInactive by setting low idle thresholds
in settings and after launching an app and waiting for some short duration,
calling 'adb shell am get-inactive', which calls the desired method on UsageStatsManager.

Bug:21667688
Change-Id: I5acbee0f6b617fb93cdfc120a004b99d3fc07ada
diff --git a/CtsTestCaseList.mk b/CtsTestCaseList.mk
index 8e0d83d..7a37542 100644
--- a/CtsTestCaseList.mk
+++ b/CtsTestCaseList.mk
@@ -211,6 +211,7 @@
     CtsHostUi \
     CtsMonkeyTestCases \
     CtsThemeHostTestCases \
+    CtsUsageHostTestCases \
     CtsSecurityHostTestCases \
     CtsUsbTests
 
diff --git a/hostsidetests/usage/Android.mk b/hostsidetests/usage/Android.mk
new file mode 100644
index 0000000..917528b
--- /dev/null
+++ b/hostsidetests/usage/Android.mk
@@ -0,0 +1,32 @@
+# 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.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+LOCAL_MODULE_TAGS := optional
+
+# Must match the package name in CtsTestCaseList.mk
+LOCAL_MODULE := CtsUsageHostTestCases
+
+LOCAL_JAVA_LIBRARIES := cts-tradefed tradefed-prebuilt
+
+LOCAL_CTS_TEST_PACKAGE := android.host.app.usage
+
+include $(BUILD_CTS_HOST_JAVA_LIBRARY)
+
+include $(call all-subdir-makefiles)
diff --git a/hostsidetests/usage/app/Android.mk b/hostsidetests/usage/app/Android.mk
new file mode 100644
index 0000000..b23efbc
--- /dev/null
+++ b/hostsidetests/usage/app/Android.mk
@@ -0,0 +1,28 @@
+# 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.
+
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+# Don't include this package in any target.
+LOCAL_MODULE_TAGS := tests
+
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+LOCAL_SDK_VERSION := current
+
+LOCAL_PACKAGE_NAME := CtsDeviceAppUsageTestApp
+
+include $(BUILD_CTS_SUPPORT_PACKAGE)
diff --git a/hostsidetests/usage/app/AndroidManifest.xml b/hostsidetests/usage/app/AndroidManifest.xml
new file mode 100755
index 0000000..bad453f
--- /dev/null
+++ b/hostsidetests/usage/app/AndroidManifest.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ * 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.
+ -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.cts.app.usage.test">
+
+    <application>
+        <activity android:name=".TestActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
+
diff --git a/hostsidetests/usage/app/src/com/android/cts/app/usage/test/TestActivity.java b/hostsidetests/usage/app/src/com/android/cts/app/usage/test/TestActivity.java
new file mode 100644
index 0000000..9432477
--- /dev/null
+++ b/hostsidetests/usage/app/src/com/android/cts/app/usage/test/TestActivity.java
@@ -0,0 +1,22 @@
+/*
+ * 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.cts.app.usage.test;
+
+import android.app.Activity;
+
+public class TestActivity extends Activity {
+}
\ No newline at end of file
diff --git a/hostsidetests/usage/src/com/android/cts/app/usage/AppIdleHostTest.java b/hostsidetests/usage/src/com/android/cts/app/usage/AppIdleHostTest.java
new file mode 100644
index 0000000..f24be0e
--- /dev/null
+++ b/hostsidetests/usage/src/com/android/cts/app/usage/AppIdleHostTest.java
@@ -0,0 +1,154 @@
+/*
+ * 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.cts.app.usage;
+
+import com.android.cts.tradefed.build.CtsBuildHelper;
+import com.android.tradefed.build.IBuildInfo;
+import com.android.tradefed.device.DeviceNotAvailableException;
+import com.android.tradefed.device.ITestDevice;
+import com.android.tradefed.testtype.DeviceTestCase;
+import com.android.tradefed.testtype.IBuildReceiver;
+
+public class AppIdleHostTest extends DeviceTestCase implements IBuildReceiver {
+    private static final String SETTINGS_APP_IDLE_CONSTANTS = "app_idle_constants";
+
+    private static final String TEST_APP_PACKAGE = "com.android.cts.app.usage.test";
+    private static final String TEST_APP_APK = "CtsDeviceAppUsageTestApp.apk";
+    private static final String TEST_APP_CLASS = "TestActivity";
+
+    private static final long ACTIVITY_LAUNCH_WAIT_MILLIS = 500;
+
+    /**
+     * A reference to the build.
+     */
+    private CtsBuildHelper mBuild;
+
+    /**
+     * A reference to the device under test.
+     */
+    private ITestDevice mDevice;
+
+    @Override
+    public void setBuild(IBuildInfo buildInfo) {
+        // Get the build, this is used to access the APK.
+        mBuild = CtsBuildHelper.createBuildHelper(buildInfo);
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        // Get the device, this gives a handle to run commands and install APKs.
+        mDevice = getDevice();
+
+        // Remove any previously installed versions of this APK.
+        mDevice.uninstallPackage(TEST_APP_PACKAGE);
+
+        // Install the APK on the device.
+        mDevice.installPackage(mBuild.getTestApp(TEST_APP_APK), false);
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+        // Remove the package once complete.
+        mDevice.uninstallPackage(TEST_APP_PACKAGE);
+        super.tearDown();
+    }
+
+    /**
+     * Checks whether an package is idle.
+     * @param appPackage The package to check for idleness.
+     * @return true if the package is idle
+     * @throws DeviceNotAvailableException
+     */
+    private boolean isAppIdle(String appPackage) throws DeviceNotAvailableException {
+        String result = mDevice.executeShellCommand(String.format("am get-inactive %s", appPackage));
+        return result.contains("Idle=true");
+    }
+
+    /**
+     * Set the app idle settings.
+     * @param settingsStr The settings string, a comma separated key=value list.
+     * @throws DeviceNotAvailableException
+     */
+    private void setAppIdleSettings(String settingsStr) throws DeviceNotAvailableException {
+        mDevice.executeShellCommand(String.format("settings put global %s \"%s\"",
+                SETTINGS_APP_IDLE_CONSTANTS, settingsStr));
+    }
+
+    /**
+     * Get the current app idle settings.
+     * @throws DeviceNotAvailableException
+     */
+    private String getAppIdleSettings() throws DeviceNotAvailableException {
+        String result = mDevice.executeShellCommand(String.format("settings get global %s",
+                SETTINGS_APP_IDLE_CONSTANTS));
+        return result.trim();
+    }
+
+    /**
+     * Launch the test app for a few hundred milliseconds then launch home.
+     * @throws DeviceNotAvailableException
+     */
+    private void startAndStopTestApp() throws DeviceNotAvailableException {
+        // Launch the app.
+        mDevice.executeShellCommand(
+                String.format("am start -W -a android.intent.action.MAIN -n %s/%s.%s",
+                        TEST_APP_PACKAGE, TEST_APP_PACKAGE, TEST_APP_CLASS));
+
+        // Wait for some time.
+        sleepUninterrupted(ACTIVITY_LAUNCH_WAIT_MILLIS);
+
+        // Launch home.
+        mDevice.executeShellCommand(
+                "am start -W -a android.intent.action.MAIN -c android.intent.category.HOME");
+    }
+
+    /**
+     * Tests that the app is idle when the idle threshold is passed, and that the app is not-idle
+     * before the threshold is passed.
+     *
+     * @throws Exception
+     */
+    public void testAppIsIdle() throws Exception {
+        final String previousState = getAppIdleSettings();
+        try {
+            // Set the app idle time to be super low.
+            setAppIdleSettings("idle_duration=5,wallclock_threshold=5");
+            startAndStopTestApp();
+            assertTrue(isAppIdle(TEST_APP_PACKAGE));
+
+            // Set the app idle time to something larger.
+            setAppIdleSettings("idle_duration=10000,wallclock_threshold=10000");
+            startAndStopTestApp();
+            assertFalse(isAppIdle(TEST_APP_PACKAGE));
+        } finally {
+            setAppIdleSettings(previousState);
+        }
+    }
+
+    private static void sleepUninterrupted(long timeMillis) {
+        boolean interrupted;
+        do {
+            try {
+                Thread.sleep(timeMillis);
+                interrupted = false;
+            } catch (InterruptedException e) {
+                interrupted = true;
+            }
+        } while (interrupted);
+    }
+}