uiautomator/library/src/com/android/uiautomator/core/UiWatcher.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.android.uiautomator.core;

/**
 * See {@link UiDevice#registerWatcher(String, UiWatcher)} on how to register a
 * a condition watcher to be called by the automation library. The automation library will
 * invoke checkForCondition() only when a regular API call is in retry mode because it is unable
 * to locate its selector yet. Only during this time, the watchers are invoked to check if there is
 * something else unexpected on the screen.
 */
public interface UiWatcher {
    public boolean checkForCondition();
}