Refactored most BasicSample classes to Kotlin

ui/espresso/BasicSample/app/src/androidTest/java/com/example/android/testing/espresso/BasicSample/ChangeTextBehaviorKtTest.kt

@@ -16,25 +16,23 @@
 
 package com.example.android.testing.espresso.BasicSample
 
-import androidx.test.ext.junit.rules.activityScenarioRule
 import android.app.Activity
-import androidx.test.core.app.ActivityScenario
-import androidx.test.core.app.launchActivity
 import androidx.test.espresso.Espresso.onView
 import androidx.test.espresso.action.ViewActions
-import androidx.test.espresso.action.ViewActions.*
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.closeSoftKeyboard
+import androidx.test.espresso.action.ViewActions.typeText
 import androidx.test.espresso.assertion.ViewAssertions.matches
 import androidx.test.espresso.matcher.ViewMatchers
 import androidx.test.espresso.matcher.ViewMatchers.withId
 import androidx.test.espresso.matcher.ViewMatchers.withText
+import androidx.test.ext.junit.rules.activityScenarioRule
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import androidx.test.filters.LargeTest
-import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
 
-
 /**
  * The kotlin equivalent to the ChangeTextBehaviorTest, that
  * showcases simple view matchers and actions like [ViewMatchers.withId],
@@ -56,10 +54,9 @@ class ChangeTextBehaviorKtTest {
 
     @Test
     fun changeText_sameActivity() {
-
         // Type text and then press the button.
         onView(withId(R.id.editTextUserInput))
-                .perform(typeText(STRING_TO_BE_TYPED), closeSoftKeyboard())
+            .perform(typeText(STRING_TO_BE_TYPED), closeSoftKeyboard())
         onView(withId(R.id.changeTextBt)).perform(click())
 
         // Check that the text was changed.
@@ -69,8 +66,10 @@ class ChangeTextBehaviorKtTest {
     @Test
     fun changeText_newActivity() {
         // Type text and then press the button.
-        onView(withId(R.id.editTextUserInput)).perform(typeText(STRING_TO_BE_TYPED),
-                closeSoftKeyboard())
+        onView(withId(R.id.editTextUserInput)).perform(
+            typeText(STRING_TO_BE_TYPED),
+            closeSoftKeyboard()
+        )
         onView(withId(R.id.activityChangeTextBtn)).perform(click())
 
         // This view is in a different Activity, no need to tell Espresso.
@@ -81,4 +80,4 @@ class ChangeTextBehaviorKtTest {
 
         val STRING_TO_BE_TYPED = "Espresso"
     }
-}
+}

ui/espresso/BasicSample/app/src/main/java/com/example/android/testing/espresso/BasicSample/MainActivity.kt

@@ -0,0 +1,61 @@
+/*
+ * 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.BasicSample
+
+import android.app.Activity
+import android.os.Bundle
+import android.view.View
+import android.widget.EditText
+import android.widget.TextView
+
+/**
+ * An [Activity] that gets a text string from the user and displays it back when the user
+ * clicks on one of the two buttons. The first one shows it in the same activity and the second
+ * one opens another activity and displays the message.
+ */
+class MainActivity : Activity(), View.OnClickListener {
+    // The TextView used to display the message inside the Activity.
+    private var mTextView: TextView? = null
+
+    // The EditText where the user types the message.
+    private var mEditText: EditText? = null
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        // Set the listeners for the buttons.
+        findViewById<View>(R.id.changeTextBt).setOnClickListener(this)
+        findViewById<View>(R.id.activityChangeTextBtn).setOnClickListener(this)
+        mTextView = findViewById<View>(R.id.textToBeChanged) as TextView
+        mEditText = findViewById<View>(R.id.editTextUserInput) as EditText
+    }
+
+    override fun onClick(view: View) {
+        // Get the text from the EditText view.
+        val text = mEditText!!.text.toString()
+        val changeTextBtId = R.id.changeTextBt
+        val activityChangeTextBtnId = R.id.activityChangeTextBtn
+        if (view.id == changeTextBtId) {
+            // First button's interaction: set a text in a text view.
+            mTextView!!.text = text
+        } else if (view.id == activityChangeTextBtnId) {
+            // Second button's interaction: start an activity and send a message to it.
+            val intent = ShowTextActivity
+                .newStartIntent(this, text)
+            startActivity(intent)
+        }
+    }
+}

ui/espresso/BasicSample/app/src/main/java/com/example/android/testing/espresso/BasicSample/ShowTextActivity.kt

@@ -0,0 +1,58 @@
+/*
+ * 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.BasicSample
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.view.View
+import android.widget.TextView
+import com.google.common.base.Strings
+
+/**
+ * A simple [Activity] that shows a message.
+ */
+class ShowTextActivity : Activity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_show_text)
+
+        // Get the message from the Intent.
+        val intent = intent
+        val message = Strings.nullToEmpty(intent.getStringExtra(KEY_EXTRA_MESSAGE))
+
+        // Show message.
+        (findViewById<View>(R.id.show_text_view) as TextView).text = message
+    }
+
+    companion object {
+        // The name of the extra data sent through an {@link Intent}.
+        const val KEY_EXTRA_MESSAGE = "com.example.android.testing.espresso.basicsample.MESSAGE"
+
+        /**
+         * Creates an [Intent] for [ShowTextActivity] with the message to be displayed.
+         * @param context the [Context] where the [Intent] will be used
+         * @param message a [String] with text to be displayed
+         * @return an [Intent] used to start [ShowTextActivity]
+         */
+        fun newStartIntent(context: Context?, message: String?): Intent {
+            val newIntent = Intent(context, ShowTextActivity::class.java)
+            newIntent.putExtra(KEY_EXTRA_MESSAGE, message)
+            return newIntent
+        }
+    }
+}