content: /*
   * Copyright 2015, 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.example.android.testing.espresso.CustomMatcherSample;
  
  import android.app.Activity;
  import android.os.Bundle;
  import androidx.annotation.VisibleForTesting;
  import android.view.View;
  import android.widget.EditText;
  
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * Asks the user for a coffee preparation and shows if it is valid.
   * <p>Valid inputs are anything ending in "coffee" or strings listed in
   * {@link MainActivity#COFFEE_PREPARATIONS} The check is always case-insensitive.
   * </p>
   */
  public class MainActivity extends Activity implements View.OnClickListener {
  
      @VisibleForTesting
      public static final List<String> COFFEE_PREPARATIONS =
              Arrays.asList("Espresso", "Latte", "Mocha", "Café con leche", "Cold brew");
  
      @VisibleForTesting
      public static final String VALID_ENDING = "coffee";
  
      private EditText mInputText;
      private View mSuccessView;
      private View mErrorView;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          // Sets the listener for the button.
          findViewById(R.id.button).setOnClickListener(this);
  
          // Get references to the EditText and views showing the result.
          mInputText = (EditText) findViewById(R.id.editText);
          mSuccessView = findViewById(R.id.inputValidationSuccess);
          mErrorView = findViewById(R.id.inputValidationError);
      }
  
      @Override
      public void onClick(View view) {
          if (view.getId() == R.id.button) {
              // The View to display depends on whether the input is valid or not.
              final String inputText = mInputText.getText().toString();
  
              // Validate the input and show the result.
              showResult(validateText(inputText));
          }
      }
  
      private void showResult(boolean isValidResult) {
          mSuccessView.setVisibility(isValidResult ? View.VISIBLE : View.GONE);
          mErrorView.setVisibility(isValidResult ? View.GONE : View.VISIBLE);
      }
  
      private static boolean validateText(String inputText) {
          // Every input ending in VALID_ENDING will return true.
          if (inputText.toLowerCase().endsWith(VALID_ENDING)) {
              return true;
          }
  
          // Check if the string is in the list.
          for (String preparation : COFFEE_PREPARATIONS) {
              if (preparation.equalsIgnoreCase(inputText)) {
                  return true;
              }
          }
          return false;
      }
  }
  