必须先在插页式广告上设置广告单元 ID，然后才能调用加载广告

Question

下面是代码。我收到一条错误消息，指出必须先在插页式广告上设置广告单元 ID，然后才能调用加载广告。

Android 工作室指定的错误代码是 mInterstitialAd.loadAd(new AdRequest.Builder((.build(((; 下面的代码有什么问题？

主要活动.java

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;

import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.InterstitialAd;
public class MainActivity extends AppCompatActivity {
private AdView mAdView;
private InterstitialAd mInterstitialAd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAdView = findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
String Interstitial_id = MyApplication.Interstitial_ad_unit_id;
mInterstitialAd = new InterstitialAd(this);
mInterstitialAd.setAdUnitId(Interstitial_id);
mInterstitialAd.loadAd(new AdRequest.Builder().build());
}
@Override
public void onBackPressed() {
/*   if (webView.canGoBack()) {
webView.goBack();
} else { */
if (mInterstitialAd.isLoaded()) {
mInterstitialAd.show();
mInterstitialAd.setAdListener(new AdListener() {
@Override
public void onAdClosed() {
finish();
}
});
} else {
super.onBackPressed();
}
}
}

activity_main.xlm

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="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=".MainActivity"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="9">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">

<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_ad_unit_id">
</com.google.android.gms.ads.AdView>
</LinearLayout>

清单.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

字符串.xml

<resources>
<string name="app_name">kidsyube</string>

<!-- 테스트용-->
<string name="APPLICATION_ID">ca-app-pub-3940256099942544~3347511713</string>
<string name="banner_ad_unit_id">ca-app-pub-3940256099942544/6300978111</string>
<string name="Interstitial_ad_unit_id">ca-app-pub-3940256099942544/1033173712</string>

</resources>

MyApplication.java

import android.app.Application;
public class MyApplication extends Application {
public static String Interstitial_ad_unit_id;
public static String APPLICATION_ID;
@Override
public void onCreate(){
super.onCreate();
//테스트용
MyApplication.Interstitial_ad_unit_id = "ca-app-pub-3940256099942544/1033173712";
MyApplication.APPLICATION_ID = "ca-app-pub-3940256099942544~3347511713";

}
}

Answer 1

在

onCreate开头添加这样的 Id(在调用之前( 广告(：

MobileAds.initialize(this, "ca-app-pub-3399353667275215~87472*****");

要在清单中添加：

<meta-data
android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="ca-app-pub-3399353667275215~8747253052"/>

添加super.onAdClosed：

public void onAdClosed() {
super.onAdClosed();
finish();
}