content: /*
   * Copyright (C) 2017 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 androidx.test.espresso.action;
  
  import android.app.Activity;
  import android.view.KeyEvent;
  import android.view.View;
  import androidx.test.espresso.UiController;
  
  /** Performs an Android press back action */
  public final class PressBackAction extends KeyEventActionBase {
  
    private final boolean conditional;
  
    /**
     * Performs a press back action
     *
     * @param conditional Indicated whether or not to throw an exception when Espresso navigates
     *     outside the application or process under test. {@code true} will throw.
     */
    public PressBackAction(boolean conditional) {
      this(conditional, new EspressoKey.Builder().withKeyCode(KeyEvent.KEYCODE_BACK).build());
    }
  
    public PressBackAction(boolean conditional, EspressoKey espressoKey) {
      super(espressoKey);
      this.conditional = conditional;
    }
  
    @Override
    public void perform(UiController uiController, View view) {
  
      Activity initialActivity = getCurrentActivity();
  
      super.perform(uiController, view);
  
      // Wait for a Stage change of the initial activity.
      waitForStageChangeInitialActivity(uiController, initialActivity);
      // Wait until there are no other pending activities in a foreground stage.
      waitForPendingForegroundActivities(uiController, conditional);
    }
  }
  