Disable animations when testing

app/src/androidTest/java/org/isoron/uhabits/ui/MainTest.java

@@ -63,6 +63,18 @@ public class MainTest
             MainActivity.class);
 
     @Before
+    public void setup()
+    {
+        disableAnimations();
+        skipTutorial();
+    }
+
+    public void disableAnimations()
+    {
+        Context context = InstrumentationRegistry.getInstrumentation().getContext();
+        new SystemAnimations(context).disableAll();
+    }
+
     public void skipTutorial()
     {
         try

app/src/androidTest/java/org/isoron/uhabits/ui/SystemAnimations.java

@@ -0,0 +1,68 @@
+package org.isoron.uhabits.ui;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.IBinder;
+import android.support.test.runner.AndroidJUnitRunner;
+import android.util.Log;
+
+import java.lang.reflect.Method;
+
+/**
+ * Disable animations so that they do not interfere with Espresso tests.
+ *
+ * Source: https://code.google.com/p/android-test-kit/wiki/DisablingAnimations
+ */
+public final class SystemAnimations extends AndroidJUnitRunner
+{
+    private static final String ANIMATION_PERMISSION = "android.permission.SET_ANIMATION_SCALE";
+    private static final float DISABLED = 0.0f;
+    private static final float DEFAULT = 1.0f;
+
+    private final Context context;
+
+    SystemAnimations(Context context) {
+        this.context = context;
+    }
+
+    void disableAll() {
+        Log.i("SystemAnimations", "Trying to disable animations");
+        int permStatus = context.checkCallingOrSelfPermission(ANIMATION_PERMISSION);
+        if (permStatus == PackageManager.PERMISSION_GRANTED) {
+            setSystemAnimationsScale(DISABLED);
+        } else {
+            Log.e("SystemAnimations", "Permission denied");
+        }
+
+    }
+
+    void enableAll() {
+        int permStatus = context.checkCallingOrSelfPermission(ANIMATION_PERMISSION);
+        if (permStatus == PackageManager.PERMISSION_GRANTED) {
+            setSystemAnimationsScale(DEFAULT);
+        }
+    }
+
+    private void setSystemAnimationsScale(float animationScale) {
+        try {
+            Class<?> windowManagerStubClazz = Class.forName("android.view.IWindowManager$Stub");
+            Method asInterface = windowManagerStubClazz.getDeclaredMethod("asInterface", IBinder.class);
+            Class<?> serviceManagerClazz = Class.forName("android.os.ServiceManager");
+            Method getService = serviceManagerClazz.getDeclaredMethod("getService", String.class);
+            Class<?> windowManagerClazz = Class.forName("android.view.IWindowManager");
+            Method setAnimationScales = windowManagerClazz.getDeclaredMethod("setAnimationScales", float[].class);
+            Method getAnimationScales = windowManagerClazz.getDeclaredMethod("getAnimationScales");
+
+            IBinder windowManagerBinder = (IBinder) getService.invoke(null, "window");
+            Object windowManagerObj = asInterface.invoke(null, windowManagerBinder);
+            float[] currentScales = (float[]) getAnimationScales.invoke(windowManagerObj);
+            for (int i = 0; i < currentScales.length; i++) {
+                currentScales[i] = animationScale;
+            }
+            setAnimationScales.invoke(windowManagerObj, new Object[]{currentScales});
+            Log.i("SystemAnimations", "All animations successfully disabled");
+        } catch (Exception e) {
+            Log.e("SystemAnimations", "Could not change animation scale to " + animationScale + " :'(");
+        }
+    }
+}