我的应用运行良好,然后我尝试添加 AdMob 依赖项。那时候事情就变得复杂了。在第一次安装然后打开应用程序崩溃。但在第二次和连续打开应用程序时运行正常,所有广告都在展示。
对我来说,这是一个糟糕的用户体验,因为第一次打开他们认为它不是一个好的应用程序。也许他们会立即卸载它。
也许我需要改进或添加一些东西,但我想不出来。我需要有关完善代码的帮助。
Android list
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gumangan.uecfispiritualhymns">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<!-- TODO: Change android:value when final building -->
<!--Sample AdMob App ID: ca-app-pub-3940256099942544~3347511713-->
<meta-data
android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="ca-app-pub-3940256099942544~3347511713"/>
<activity
android:name="com.gumangan.uecfispiritualhymns.DictionaryActivity"
android:label="@string/app_name"
android:launchMode="singleTop"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<meta-data
android:name="android.app.searchable"
android:resource="@xml/searchable" />
</activity>
<activity
android:name="com.gumangan.uecfispiritualhymns.WordDetailActivity"
android:parentActivityName="com.gumangan.uecfispiritualhymns.DictionaryActivity">
android:value="com.gumangan.uecfispiritualhymns.DictionaryActivity"/>
</activity>
</application>
渐变属性
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext.kotlin_version = '1.3.10'
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.2.1'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
maven {
url "https://maven.google.com"
}
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Gradle 依赖项
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.gumangan.uecfispiritualhymns"
minSdkVersion 16
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:support-v4:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support:cardview-v7:27.1.1'
implementation 'com.android.support:customtabs:27.1.1'
implementation 'com.google.android.gms:play-services-ads:17.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
数据库助手
package com.gumangan.uecfispiritualhymns
import android.content.Context
import android.database.Cursor
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteOpenHelper
import android.preference.PreferenceManager
import java.io.FileOutputStream
import java.io.IOException
import java.io.InputStream
import java.io.OutputStream
class DatabaseHelper(private var mContext: Context) : SQLiteOpenHelper(mContext, DATABASE_NAME, null, DATABASE_VERSION) {
companion object {
private val DATABASE_NAME = "simple_dict.db"
private val DATABASE_VERSION = 1
val DB_CREATED = "DB_CREATED"
}
private var mCreateDb = false
private var mUpgradeDb = false
private fun copyDatabaseFromAssets(db: SQLiteDatabase?) {
var inputStream: InputStream? = null
var outputStream: OutputStream? = null
try {
inputStream = mContext.assets.open(DATABASE_NAME)
outputStream = FileOutputStream(db?.path)
val buffer = ByteArray(1024)
var length: Int = inputStream!!.read(buffer)
while (length > 0) {
outputStream.write(buffer, 0, length)
length = inputStream.read(buffer)
}
outputStream.flush()
val copiedDb = mContext.openOrCreateDatabase(DATABASE_NAME, 0, null)
val isDbCreated = copiedDb != null
copiedDb.execSQL("PRAGMA user_version = $DATABASE_VERSION")
copiedDb.close()
// DB_CREATED
val sharedPref = PreferenceManager.getDefaultSharedPreferences(mContext)
val sharePrefEditor = sharedPref.edit()
sharePrefEditor.putBoolean(DB_CREATED, isDbCreated)
sharePrefEditor.apply()
} catch (e: IOException) {
e.printStackTrace()
throw Error("copyDatabaseFromAssets: Error copying database.")
} finally {
try {
outputStream?.close()
inputStream?.close()
}catch (e: IOException) {
e.printStackTrace()
throw Error("copyDatabaseFromAssets: Error closing stream.")
}
}
}
override fun onCreate(db: SQLiteDatabase?) {
mCreateDb = true
}
override fun onUpgrade(db: SQLiteDatabase?, oldVersion: Int, newVersion: Int) {
if(newVersion > oldVersion) {
mUpgradeDb = true
}
}
override fun onOpen(db: SQLiteDatabase?) {
if(mCreateDb) {
mCreateDb = false
copyDatabaseFromAssets(db)
}
if(mUpgradeDb) {
mUpgradeDb = false
copyDatabaseFromAssets(db)
}
}
fun getWords(wordPrefix: String = ""): Cursor {
return if(wordPrefix.isBlank()) {
readableDatabase.query(DictionaryEntryContract.TABLE_NAME, null,
null, null, null, null,
"${DictionaryEntryContract.COLUMN_ID} ASC")
} else {
readableDatabase.query(DictionaryEntryContract.TABLE_NAME, null,
"${DictionaryEntryContract.COLUMN_WORD} LIKE ?", arrayOf("$wordPrefix%"),
null, null, "${DictionaryEntryContract.COLUMN_ID} ASC")
}
}
fun getWord(id: String): Cursor {
return readableDatabase.query(DictionaryEntryContract.TABLE_NAME, null,
"${DictionaryEntryContract.COLUMN_ID}= ?", arrayOf(id),
null, null, null)
}
}
搜索列表适配器
package com.gumangan.uecfispiritualhymns
import android.content.Context
import android.database.Cursor
import android.graphics.Color
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.CursorAdapter
import android.widget.TextView
class SearchListAdapter(context: Context, cursor: Cursor) : CursorAdapter(context, cursor, 0) {
private class ViewHolder {
var txtWord: TextView? = null
var txtType: TextView? = null
var txtMeaning: TextView? = null
var wordColumnIndex: Int = 0
var typeColumnIndex: Int = 0
var meaningColumnIndex: Int = 0
}
override fun newView(context: Context?, cursor: Cursor?, parent: ViewGroup?): View {
val layoutInflater = LayoutInflater.from(context)
val newView = layoutInflater.inflate(R.layout.search_list_item, parent, false)
val viewHolder = ViewHolder()
viewHolder.txtWord = newView.findViewById<TextView>(R.id.txtWord)
viewHolder.txtType = newView.findViewById<TextView>(R.id.txtType)
viewHolder.txtMeaning = newView.findViewById<TextView>(R.id.txtMeaning)
viewHolder.wordColumnIndex = cursor!!.getColumnIndexOrThrow(DictionaryEntryContract.COLUMN_WORD)
viewHolder.typeColumnIndex = cursor!!.getColumnIndexOrThrow(DictionaryEntryContract.COLUMN_TYPE)
viewHolder.meaningColumnIndex = cursor!!.getColumnIndexOrThrow(DictionaryEntryContract.COLUMN_MEANING)
newView.tag = viewHolder
return newView
}
override fun bindView(view: View?, context: Context?, cursor: Cursor?) {
val viewHolder = view!!.tag as ViewHolder
viewHolder.txtWord?.text = cursor?.getString(viewHolder.wordColumnIndex)
viewHolder.txtType?.text = cursor?.getString(viewHolder.typeColumnIndex)
viewHolder.txtMeaning?.text = cursor?.getString(viewHolder.meaningColumnIndex)
}
override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
val view = super.getView(position, convertView, parent)
if(position % 2 == 0) {
view.setBackgroundColor(Color.LTGRAY)
} else {
view.setBackgroundColor(Color.WHITE)
}
return view;
}
}
DictionaryEntryContract
package com.gumangan.uecfispiritualhymns
import android.provider.BaseColumns
class DictionaryEntryContract : BaseColumns {
private constructor()
companion object {
val TABLE_NAME = "english_words"
val COLUMN_ID = BaseColumns._ID
val COLUMN_WORD = "word"
val COLUMN_TYPE = "type"
val COLUMN_MEANING = "meaning"
}
}
DictionaryActivity
package com.gumangan.uecfispiritualhymns
import android.app.SearchManager
import android.content.Context
import android.content.Intent
import android.os.AsyncTask
import android.os.Bundle
import android.preference.PreferenceManager
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.Toolbar
import android.support.v7.widget.SearchView
import android.util.Log
import android.view.Menu
import android.view.MenuItem
import android.widget.AdapterView
import android.widget.ListView
import com.google.android.gms.ads.AdRequest
import com.google.android.gms.ads.AdView
import com.google.android.gms.ads.MobileAds
import java.lang.ref.WeakReference
class DictionaryActivity : AppCompatActivity() {
companion object {
val TAG = "DictionaryActivity"
val LAST_SEARCH_WORD: String = "LAST_SEARCH_WORD"
}
var mDbHelper: DatabaseHelper? = null
private var mSearchListAdapter: SearchListAdapter? = null
private var mSearchQuery: String = ""
//Google Ads Banner Variable
lateinit var mAdView : AdView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.content_dictionary)
mSearchQuery = savedInstanceState?.getString(LAST_SEARCH_WORD) ?: ""
mDbHelper = DatabaseHelper(applicationContext)
if(!isDbLoaded()) {
showLoadingUI()
LoadViewTask(this).execute()
} else {
showDictUI()
}
/* TODO: Change ADMOB ID's when final building */
//Google Ads
//MobileAds.initialize(this, "ca-app-pub-3940256099942544~3347511713")
//Google Test Ads
MobileAds.initialize(this, "ca-app-pub-3940256099942544~3347511713")
//Google Ads Banner
mAdView = findViewById(R.id.adView)
val adRequest = AdRequest.Builder().build()
mAdView.loadAd(adRequest)
}
private fun isDbLoaded(): Boolean {
val sharedPref = PreferenceManager.getDefaultSharedPreferences(this)
return sharedPref.getBoolean(DatabaseHelper.DB_CREATED, false)
}
private fun showLoadingUI() {
setContentView(R.layout.activity_dictionary_loading)
}
private fun showDictUI() {
setContentView(R.layout.activity_dictionary)
val toolbar = findViewById<Toolbar>(R.id.toolbar)
setSupportActionBar(toolbar)
supportActionBar?.setIcon(R.mipmap.ic_launcher)
mSearchListAdapter = SearchListAdapter(applicationContext, mDbHelper!!.getWords(mSearchQuery))
val lstWords = (findViewById<ListView>(R.id.lstWords))
lstWords.adapter = mSearchListAdapter
lstWords.onItemClickListener = AdapterView.OnItemClickListener { _, _, _, id ->
val wordDetailIntent = Intent(applicationContext, WordDetailActivity::class.java)
wordDetailIntent.putExtra(WordDetailActivity.WORD_ID, "$id")
startActivity(wordDetailIntent)
}
}
override fun onSaveInstanceState(outState: Bundle?) {
super.onSaveInstanceState(outState)
outState?.putString(LAST_SEARCH_WORD, mSearchQuery)
}
override fun onRestoreInstanceState(savedInstanceState: Bundle?) {
mSearchQuery = savedInstanceState?.getString(LAST_SEARCH_WORD) ?: ""
super.onRestoreInstanceState(savedInstanceState)
}
override fun onNewIntent(intent: Intent?) {
super.onNewIntent(intent)
if(intent?.action.equals(Intent.ACTION_SEARCH)) {
val searchQuery = intent?.getStringExtra(SearchManager.QUERY) ?: ""
updateListByQuery(searchQuery)
}
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.menu_dictionary, menu)
val searchView: SearchView? = menu.findItem(R.id.action_search).actionView as? SearchView
val searchManager: SearchManager = getSystemService(Context.SEARCH_SERVICE) as SearchManager
searchView?.setSearchableInfo(searchManager.getSearchableInfo(componentName))
searchView?.setOnQueryTextListener(object : SearchView.OnQueryTextListener{
override fun onQueryTextSubmit(query: String?): Boolean {
return false
}
override fun onQueryTextChange(newText: String?): Boolean {
updateListByQuery(newText ?: "")
return true
}
})
return true
}
private fun updateListByQuery(searchQuery: String) {
mSearchQuery = searchQuery
mSearchListAdapter?.changeCursor(mDbHelper!!.getWords(searchQuery))
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
R.id.action_search -> {
onSearchRequested()
true
}
else -> super.onOptionsItemSelected(item)
}
}
private class LoadViewTask(activity: DictionaryActivity) : AsyncTask<Void, Void, Void>() {
private var mActivity = WeakReference<DictionaryActivity>(activity)
override fun doInBackground(vararg params: Void): Void? {
if(getActivityInstance()?.mDbHelper?.readableDatabase?.isOpen == true) {
Log.d(TAG, "Db is OK.")
}
return null
}
override fun onPostExecute(result: Void?) {
if(getActivityInstance()?.isDbLoaded() == true) {
getActivityInstance()?.showDictUI()
}
}
private fun getActivityInstance() = mActivity.get()
}
}
WordDetailActivity
package com.gumangan.uecfispiritualhymns
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
class WordDetailActivity : AppCompatActivity() {
companion object {
const val WORD_ID = "WORD_ID"
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_word_detail)
val wordId = intent.getStringExtra(WORD_ID) ?: ""
if(wordId.isBlank()) {
finish()
}
val dbHelper = DatabaseHelper(applicationContext)
val cursor = dbHelper.getWord(wordId)
if(cursor.moveToFirst()) {
val txtWord = findViewById<TextView>(R.id.txtWord)
val txtType = findViewById<TextView>(R.id.txtType)
val txtMeaning = findViewById<TextView>(R.id.txtMeaning)
txtWord?.text = cursor.getString(cursor.getColumnIndexOrThrow(DictionaryEntryContract.COLUMN_WORD))
txtType?.text = cursor.getString(cursor.getColumnIndexOrThrow(DictionaryEntryContract.COLUMN_TYPE))
txtMeaning?.text = cursor.getString(cursor.getColumnIndexOrThrow(DictionaryEntryContract.COLUMN_MEANING))
}
}
}
activity_dictionary.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.gumangan.uecfispiritualhymns.DictionaryActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_dictionary" />
</android.support.design.widget.CoordinatorLayout>
content_dictionary.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.gumangan.uecfispiritualhymns.DictionaryActivity"
tools:showIn="@layout/activity_dictionary">
<ListView
android:id="@+id/lstWords"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="0dp"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:layout_marginTop="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<!--Google Ads Banner Display-->
<com.google.android.gms.ads.AdView
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="5dp"
android:visibility="visible"
ads:adSize="LARGE_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent">
</com.google.android.gms.ads.AdView>
</android.support.constraint.ConstraintLayout>
activity_dictionary_loading.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.gumangan.uecfispiritualhymns.DictionaryActivity">
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="@string/dictionary_db_preparing"
android:textAlignment="center"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="@string/dictionary_db_preparing" />
</android.support.constraint.ConstraintLayout>
search_list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp">
<TextView
android:id="@+id/txtWord"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textStyle="bold"
tools:text="Word" />
<TextView
android:id="@+id/txtType"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="14sp"
android:textStyle="italic"
tools:text="Type" />
<TextView
android:id="@+id/txtMeaning"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
tools:text="Meaning" />
</LinearLayout>
activity_word_detail.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp"
tools:context="com.gumangan.uecfispiritualhymns.WordDetailActivity">
<TextView
android:id="@+id/txtWord"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:textStyle="bold"
tools:text="Word" />
<TextView
android:id="@+id/txtType"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textStyle="italic"
tools:text="Type" />
<TextView
android:id="@+id/txtMeaning"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
tools:text="Meaning" />
</LinearLayout>
这是 LogCat 错误
12-09 07:52:40.554 14146-14146/com.gumangan.uecfispiritualhymns E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.gumangan.uecfispiritualhymns/com.gumangan.uecfispiritualhymns.DictionaryActivity}: java.lang.IllegalStateException: findViewById(R.id.adView) must not be null
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: findViewById(R.id.adView) must not be null
at com.gumangan.uecfispiritualhymns.DictionaryActivity.onCreate(DictionaryActivity.kt:57)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
该应用程序是关于字典的
最佳答案
在您的 MainActivity.kt 中。尝试替换这个:
lateinit var mAdView: AdView
MobileAds.initialize(this, "ca-app-pub-3940256099942544~3347511713")
//Google Ads Banner
mAdView = findViewById(R.id.adView)
val adRequest = AdRequest.Builder().build()
mAdView.loadAd(adRequest)
mAdView.adListener = object: AdListener() {
override fun onAdLoaded() {
//adView.visibility = View.VISIBLE
//divider.visibility = View.VISIBLE
Toast.makeText(applicationContext,"Banner Ad Loaded", Toast.LENGTH_LONG).show()
}
override fun onAdFailedToLoad(errorCode : Int) {
//adView.visibility = View.GONE
//divider.visibility = View.GONE
//Timer for Loading Ads
Handler().postDelayed({
mAdView.loadAd(adRequest)
}, 300000)
//mAdView.loadAd(adRequest)
Toast.makeText(applicationContext,"Banner Ad Failed to Load", Toast.LENGTH_LONG).show()
}
override fun onAdOpened() {
// Code to be executed when the ad is displayed.
}
override fun onAdLeftApplication() {
// Code to be executed when the user has left the app.
}
override fun onAdClosed() {
//mAdView.loadAd(adRequest)
//Toast.makeText(applicationContext,"Banner Ad Loaded Again", Toast.LENGTH_LONG).show()
}
}
用这个:
import kotlinx.android.synthetic.main.content_main.*
MobileAds.initialize(this,"ca-app-pub-3940256099942544~3347511713")
adView.loadAd(AdRequest.Builder().build())
并确保 adView 可见。
关于android - 仅当添加 AdMob 时应用程序在首次打开时崩溃,但在下次打开时运行正常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53629859/