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/*
* Copyright (C) 2013 DroidDriver committers
*
* 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.google.android.droiddriver.uiautomation.base;
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.util.Logs;
/**
* Base implementation of DroidDriver that gets attributes via the Accessibility
* API.
*/
public abstract class BaseUiAutomationDriver<E extends BaseUiAutomationElement<E>> 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 BaseUiAutomationContext<E> context;
private final UiAutomationUiDevice uiDevice;
protected BaseUiAutomationDriver(Instrumentation instrumentation) {
this.context = newContext(instrumentation);
this.uiDevice = new UiAutomationUiDevice(context);
}
protected abstract BaseUiAutomationContext<E> newContext(Instrumentation instrumentation);
@Override
protected E getNewRootElement() {
return context.getUiElement(getRootNode(), null /* parent */);
}
@Override
protected BaseUiAutomationContext<E> 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));
}
@Override
public UiAutomationUiDevice getUiDevice() {
return uiDevice;
}
}
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