content: /*
   * Copyright (C) 2021 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.car.app.sample.showcase.common.misc;
  
  import static androidx.car.app.model.Action.BACK;
  
  import android.os.Handler;
  import android.os.Looper;
  
  import androidx.annotation.NonNull;
  import androidx.car.app.CarContext;
  import androidx.car.app.Screen;
  import androidx.car.app.model.Pane;
  import androidx.car.app.model.PaneTemplate;
  import androidx.car.app.model.Row;
  import androidx.car.app.model.Template;
  import androidx.car.app.sample.showcase.common.R;
  import androidx.lifecycle.DefaultLifecycleObserver;
  import androidx.lifecycle.LifecycleOwner;
  
  /** Creates a screen that shows loading states in a pane. */
  public final class LoadingDemoScreen extends Screen implements DefaultLifecycleObserver {
      private static final int LOADING_TIME_MILLIS = 2000;
      private boolean mIsFinishedLoading = false;
      private final Handler mHandler = new Handler(Looper.getMainLooper());
  
      public LoadingDemoScreen(@NonNull CarContext carContext) {
          super(carContext);
          getLifecycle().addObserver(this);
      }
  
      @Override
      @SuppressWarnings({"FutureReturnValueIgnored"})
      public void onStart(@NonNull LifecycleOwner owner) {
          // Post a message that finishes loading the template after some time.
          mHandler.postDelayed(
                  () -> {
                      mIsFinishedLoading = true;
                      invalidate();
                  },
                  LOADING_TIME_MILLIS);
      }
  
      @NonNull
      @Override
      public Template onGetTemplate() {
          Pane.Builder paneBuilder = new Pane.Builder();
  
          if (!mIsFinishedLoading) {
              paneBuilder.setLoading(true);
          } else {
              paneBuilder.addRow(new Row.Builder()
                      .setTitle(getCarContext().getString(R.string.loading_demo_row_title))
                      .build());
          }
  
          return new PaneTemplate.Builder(paneBuilder.build())
                  .setTitle(getCarContext().getString(R.string.loading_demo_title))
                  .setHeaderAction(BACK)
                  .build();
      }
  }
  