hvisser · January 23, 2018 11:44 · Jan 23, 2018
diff --git a/DemoModeEnabler.kt b/DemoModeEnabler.kt
@@ -0,0 +1,35 @@
+class DemoModeEnabler {
+
+    fun enable() {
+        executeShellCommand("settings put global sysui_demo_allowed 1")
+        sendCommand("exit")
+        sendCommand("enter")
+        sendCommand("notifications", "visible" to "false")
+        sendCommand("network", "wifi" to "hide")
+        sendCommand("battery", "level" to "100", "plugged" to "false")
+        sendCommand("clock", "hhmm" to "1000")
+    }
+
+    fun disable() {
+        sendCommand("exit")
+    }
+
+    private fun sendCommand(command: String, vararg extras: Pair<String, Any>) {
+        val exec = StringBuilder("am broadcast -a com.android.systemui.demo -e command $command")
+        for ((key, value) in extras) {
+            exec.append(" -e $key $value")
+        }
+        executeShellCommand(exec.toString())
+    }
+
+    private fun executeShellCommand(command: String) {
+        waitForCompletion(InstrumentationRegistry.getInstrumentation().uiAutomation.executeShellCommand(command))
+    }
+
+    private fun waitForCompletion(descriptor: ParcelFileDescriptor) {
+        val reader = BufferedReader(InputStreamReader(ParcelFileDescriptor.AutoCloseInputStream(descriptor)))
+        reader.use {
+            it.readText()
+        }
+    }
+}
diff --git a/DemoModeRule.kt b/DemoModeRule.kt
@@ -0,0 +1,16 @@
+class DemoModeRule: TestRule {
+
+    private val helper = DemoModeEnabler()
+
+    override fun apply(base: Statement, description: Description): Statement {
+        return DemoModeStatement(base)
+    }
+
+    private inner class DemoModeStatement(private val base: Statement) : Statement() {
+        override fun evaluate() {
+            helper.enable()
+            base.evaluate()
+            helper.disable()
+        }
+    }
+}
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