add AccessibilityDriver for testing Accessibility

This is the first cut with known issues, e.g. needs to handle
click on EditText differently, etc. Thic cl sets up the architecture
of AccessibilityDriver; details will be filled in follow-up cls.

Change-Id: I2881b28075eba478a5aad9d7e945b5d55e78da89

1 files changed, 7 insertions, 99 deletions

diff --git a/src/com/google/android/droiddriver/uiautomation/UiAutomationDriver.java b/src/com/google/android/droiddriver/uiautomation/UiAutomationDriver.java
index d465816..9291f13 100644
--- a/src/com/google/android/droiddriver/uiautomation/UiAutomationDriver.java
+++ b/src/com/google/android/droiddriver/uiautomation/UiAutomationDriver.java
@@ -17,112 +17,20 @@
 package com.google.android.droiddriver.uiautomation;
 
 import android.app.Instrumentation;
-import android.app.UiAutomation;
-import android.content.Context;
-import android.os.SystemClock;
-import android.view.accessibility.AccessibilityEvent;
-import android.view.accessibility.AccessibilityManager;
-import android.view.accessibility.AccessibilityNodeInfo;
 
-import com.google.android.droiddriver.base.BaseDroidDriver;
-import com.google.android.droiddriver.exceptions.TimeoutException;
-import com.google.android.droiddriver.uiautomation.UiAutomationContext.UiAutomationCallable;
-import com.google.android.droiddriver.util.Logs;
+import com.google.android.droiddriver.uiautomation.base.BaseUiAutomationDriver;
 
 /**
- * Implementation of DroidDriver that is driven via the accessibility layer.
+ * Implementation of DroidDriver that gets attributes via the Accessibility API
+ * and is acted upon via synthesized events.
  */
-public class UiAutomationDriver extends BaseDroidDriver {
-  // TODO: magic const from UiAutomator, but may not be useful
-  /**
-   * This value has the greatest bearing on the appearance of test execution
-   * speeds. This value is used as the minimum time to wait before considering
-   * the UI idle after each action.
-   */
-  private static final long QUIET_TIME_TO_BE_CONSIDERD_IDLE_STATE = 500;// ms
-
-  private final UiAutomationContext context;
-  private final UiAutomationUiDevice uiDevice;
-
+public class UiAutomationDriver extends BaseUiAutomationDriver<UiAutomationElement> {
   public UiAutomationDriver(Instrumentation instrumentation) {
-    this.context = new UiAutomationContext(instrumentation, this);
-    this.uiDevice = new UiAutomationUiDevice(context);
-  }
-
-  @Override
-  protected UiAutomationElement getNewRootElement() {
-    return context.getUiElement(getRootNode(), null /* parent */);
-  }
-
-  @Override
-  protected UiAutomationContext getContext() {
-    return context;
-  }
-
-  private AccessibilityNodeInfo getRootNode() {
-    final long timeoutMillis = getPoller().getTimeoutMillis();
-    context.callUiAutomation(new UiAutomationCallable<Void>() {
-      @Override
-      public Void call(UiAutomation uiAutomation) {
-        try {
-          uiAutomation.waitForIdle(QUIET_TIME_TO_BE_CONSIDERD_IDLE_STATE, timeoutMillis);
-          return null;
-        } catch (java.util.concurrent.TimeoutException e) {
-          throw new TimeoutException(e);
-        }
-      }
-    });
-
-    long end = SystemClock.uptimeMillis() + timeoutMillis;
-    while (true) {
-      AccessibilityNodeInfo root =
-          context.callUiAutomation(new UiAutomationCallable<AccessibilityNodeInfo>() {
-            @Override
-            public AccessibilityNodeInfo call(UiAutomation uiAutomation) {
-              return uiAutomation.getRootInActiveWindow();
-            }
-          });
-      if (root != null) {
-        return root;
-      }
-      long remainingMillis = end - SystemClock.uptimeMillis();
-      if (remainingMillis < 0) {
-        throw new TimeoutException(
-            String.format("Timed out after %d milliseconds waiting for root AccessibilityNodeInfo",
-                timeoutMillis));
-      }
-      SystemClock.sleep(Math.min(250, remainingMillis));
-    }
-  }
-
-  /**
-   * Some widgets fail to trigger some AccessibilityEvent's after actions,
-   * resulting in stale AccessibilityNodeInfo's. As a work-around, force to
-   * clear the AccessibilityNodeInfoCache.
-   */
-  public void clearAccessibilityNodeInfoCache() {
-    Logs.call(this, "clearAccessibilityNodeInfoCache");
-    uiDevice.sleep();
-    uiDevice.wakeUp();
-  }
-
-  /**
-   * {@link #clearAccessibilityNodeInfoCache} causes the screen to blink. This
-   * method clears the cache without blinking by employing an implementation
-   * detail of AccessibilityNodeInfoCache. This is a hack; use it at your own
-   * discretion.
-   */
-  public void clearAccessibilityNodeInfoCacheHack() {
-    Logs.call(this, "clearAccessibilityNodeInfoCacheHack");
-    AccessibilityManager accessibilityManager =
-        (AccessibilityManager) context.getInstrumentation().getTargetContext()
-            .getSystemService(Context.ACCESSIBILITY_SERVICE);
-    accessibilityManager.sendAccessibilityEvent(AccessibilityEvent
-        .obtain(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED));
+    super(instrumentation);
   }
 
   @Override
-  public UiAutomationUiDevice getUiDevice() {
-    return uiDevice;
+  protected UiAutomationContext newContext(Instrumentation instrumentation) {
+    return new UiAutomationContext(instrumentation, this);
   }
 }