Attempt to stop tests failing occasionally on travis due to screenlock

Travis often fails tests with the following error:

> java.lang.RuntimeException: Waited for the root of the view hierarchy to have window focus and not be requesting layout for over 10 seconds. If you specified a non default root matcher, it may be picking a root that never takes focus. Otherwise, something is seriously wrong.

It seems that this is due to the keypad locking if the emulator starts slowly.
Hopefully this commit will fix the problem.

src/androidTest/java/medic/gateway/SettingsDialogActivityTest.java

@@ -34,9 +34,10 @@ public class SettingsDialogActivityTest {
 	private HttpTestHelper http;
 
 	@Before
-	public void setUp() throws Exception {
+	public void setUp() throws Throwable {
 		clearAppSettings();
 		this.http = new HttpTestHelper();
+		preventScreenLock(activityTestRule);
 	}
 
 	@After

src/androidTest/java/medic/gateway/test/TestUtils.java

@@ -3,12 +3,14 @@
 import android.app.*;
 import android.content.*;
 import android.support.test.rule.*;
+import android.view.*;
 
 import medic.gateway.*;
 
 import java.util.*;
 import java.util.regex.*;
 
+import static android.content.Context.KEYGUARD_SERVICE;
 import static android.support.test.InstrumentationRegistry.*;
 import static org.junit.Assert.*;
 
@@ -52,4 +54,23 @@ public void run() {
 			}
 		});
 	}
+
+	@SuppressWarnings("deprecation")
+	public static void preventScreenLock(final ActivityTestRule testRule) throws Throwable {
+		testRule.runOnUiThread(new Runnable() {
+			public void run() {
+				Activity activity = testRule.getActivity();
+
+				// prevent lock
+				KeyguardManager k = (KeyguardManager) activity.getSystemService(KEYGUARD_SERVICE);
+				k.newKeyguardLock(KEYGUARD_SERVICE).disableKeyguard();
+
+				// turn on screen and remove any current locks
+				activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
+						WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
+						WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON |
+						WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+			};
+		});
+	}
 }

src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+		package="medic.gateway">
+	<!-- extra permissions used by instrumentation tests -->
+	<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
+	<uses-permission android:name="android.permission.WAKE_LOCK"/>
+</manifest>