AndroidでAdMobアプリを作るとエラーになって落ちる

前提

Android StudioでGoogle AdMob Ads Activityプロジェクトを新規作成してビルドしてapkをインストールしました。

実現したいこと

とりあえずスケルトンアプリを起動したい。

発生している問題・エラーメッセージ

2022-09-19 08:38:38.239 10706-11020/com.example.xxxxxxx E/chromium: [ERROR:simple_file_enumerator.cc(21)] opendir /data/user/0/com.example.xxxxxxx/cache/WebView/Default/HTTP Cache/Code Cache/js: No such file or directory (2)
2022-09-19 08:38:38.240 10706-11020/com.example.xxxxxxx E/chromium: [ERROR:simple_index_file.cc(614)] Could not reconstruct index from disk

該当のソースコード

Kotlin
1package com.example.xxxxxxx
2
3import com.google.android.gms.ads.AdError
4import com.google.android.gms.ads.AdRequest
5import com.google.android.gms.ads.FullScreenContentCallback
6import com.google.android.gms.ads.LoadAdError
7import com.google.android.gms.ads.MobileAds
8import com.google.android.gms.ads.interstitial.InterstitialAd
9import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback
10import android.widget.Button
11import android.widget.TextView
12
13import android.os.Bundle
14import android.util.Log
15import androidx.appcompat.app.AppCompatActivity
16import android.view.Menu
17import android.view.MenuItem
18import android.widget.Toast
19import com.example.xxxxxxx.databinding.ActivityMainBinding
20
21import java.util.Locale
22
23// Remove the line below after defining your own ad unit ID.
24private const val TOAST_TEXT = "Test ads are being shown. " +
25        "To show live ads, replace the ad unit ID in res/values/strings.xml " +
26        "with your own ad unit ID."
27private const val START_LEVEL = 1
28
29class MainActivity : AppCompatActivity() {
30
31    private var currentLevel: Int = 0
32    private var interstitialAd: InterstitialAd? = null
33    private lateinit var nextLevelButton: Button
34    private lateinit var levelTextView: TextView
35    private val TAG = "MainActivity"
36    private lateinit var binding: ActivityMainBinding
37
38    override fun onCreate(savedInstanceState: Bundle?) {
39        super.onCreate(savedInstanceState)
40
41        binding = ActivityMainBinding.inflate(layoutInflater)
42        setContentView(binding.root)
43
44        MobileAds.initialize(
45            this
46        ) { }
47        // Load the InterstitialAd and set the adUnitId (defined in values/strings.xml).
48        loadInterstitialAd()
49
50        // Create the next level button, which tries to show an interstitial when clicked.
51        nextLevelButton = binding.nextLevelButton
52        nextLevelButton.isEnabled = false
53        nextLevelButton.setOnClickListener { showInterstitial() }
54
55        levelTextView = binding.level
56        // Create the text view to show the level number.
57        currentLevel = START_LEVEL
58
59        // Toasts the test ad message on the screen. Remove this after defining your own ad unit ID.
60        Toast.makeText(this, TOAST_TEXT, Toast.LENGTH_LONG).show()
61    }
62
63    override fun onCreateOptionsMenu(menu: Menu): Boolean {
64        // Inflate the menu; this adds items to the action bar if it is present.
65        menuInflater.inflate(R.menu.menu_main, menu)
66        return true
67    }
68
69    override fun onOptionsItemSelected(item: MenuItem) =
70        when (item.itemId) {
71            R.id.action_settings -> true
72            else -> super.onOptionsItemSelected(item)
73        }
74
75    private fun loadInterstitialAd() {
76        val adRequest = AdRequest.Builder().build()
77        InterstitialAd.load(this, getString(R.string.interstitial_ad_unit_id), adRequest,
78            object : InterstitialAdLoadCallback() {
79                override fun onAdLoaded(ad: InterstitialAd) {
80                    // The interstitialAd reference will be null until
81                    // an ad is loaded.
82                    interstitialAd = ad
83                    nextLevelButton.setEnabled(true)
84                    Toast.makeText(this@MainActivity, "onAdLoaded()", Toast.LENGTH_SHORT)
85                        .show()
86                    ad.setFullScreenContentCallback(
87                        object : FullScreenContentCallback() {
88                            override fun onAdDismissedFullScreenContent() {
89                                // Called when fullscreen content is dismissed.
90                                // Make sure to set your reference to null so you don't
91                                // show it a second time.
92                                interstitialAd = null
93                                Log.d(TAG, "The ad was dismissed.")
94                            }
95
96                            override fun onAdFailedToShowFullScreenContent(adError: AdError) {
97                                // Called when fullscreen content failed to show.
98                                // Make sure to set your reference to null so you don't
99                                // show it a second time.
100                                interstitialAd = null
101                                Log.d(TAG, "The ad failed to show.")
102                            }
103
104                            override fun onAdShowedFullScreenContent() {
105                                // Called when fullscreen content is shown.
106                                Log.d(TAG, "The ad was shown.")
107                            }
108                        })
109                }
110
111                override fun onAdFailedToLoad(loadAdError: LoadAdError) {
112                    // Handle the error
113                    Log.i(TAG, loadAdError.message)
114                    interstitialAd = null
115                    nextLevelButton.setEnabled(true)
116                    val error: String = String.format(
117                        Locale.ENGLISH,
118                        "domain: %s, code: %d, message: %s",
119                        loadAdError.domain,
120                        loadAdError.code,
121                        loadAdError.message
122                    )
123                    Toast.makeText(
124                        this@MainActivity,
125                        "onAdFailedToLoad() with error: $error", Toast.LENGTH_SHORT
126                    )
127                        .show()
128                }
129            })
130    }
131
132    private fun showInterstitial() {
133        // Show the ad if it"s ready. Otherwise toast and reload the ad.
134        if (interstitialAd != null) {
135            interstitialAd!!.show(this)
136        } else {
137            Toast.makeText(this, "Ad did not load", Toast.LENGTH_SHORT).show()
138            goToNextLevel()
139        }
140    }
141
142    private fun goToNextLevel() {
143        // Show the next level and reload the ad to prepare for the level after.
144        levelTextView.text = "Level " + (++currentLevel)
145        if (interstitialAd == null) {
146            loadInterstitialAd()
147        }
148    }
149}