java - 我做错了什么，如何添加插页式广告

Question

这几天我一直在尝试弄清楚如何向我的项目添加广告。我希望你们能告诉我该怎么做。我试图在第一轮之后(玩家第一次死亡)在他们关闭广告后转换广告；这将使他们能够再次玩游戏。

没有广告出现，并且我收到如下错误:

09-02 17:14:53.825: W/dalvikvm(635): threadid=11: thread exiting with uncaught exception     (group=0x40a13300)
09-02 17:14:53.835: E/AndroidRuntime(635): FATAL EXCEPTION: GLThread 75
09-02 17:14:53.835: E/AndroidRuntime(635): java.lang.NullPointerException
09-02 17:14:53.835: E/AndroidRuntime(635):  at     com.JrodManU.LaserJumper.android.Ad.loadAd(Ad.java:45)
09-02 17:14:53.835: E/AndroidRuntime(635):  at     com.JrodManU.LaserJumper.android.AndroidLauncher.loadAd(AndroidLauncher.java:26)
09-02 17:14:53.835: E/AndroidRuntime(635):  at   com.JrodManU.LaserJumper.LaserJumper.loadAd(LaserJumper.java:36)
09-02 17:14:53.835: E/AndroidRuntime(635):  at com.JrodManU.LaserJumper.screens.InGameScreen.    <init>(InGameScreen.java:51)
09-02 17:14:53.835: E/AndroidRuntime(635):  at     com.JrodManU.LaserJumper.LaserJumper.create(LaserJumper.java:15)
09-02 17:14:53.835: E/AndroidRuntime(635):  at     com.badlogic.gdx.backends.android.AndroidGraphics.onSurfaceChanged(AndroidGraphics.java:236)
09-02 17:14:53.835: E/AndroidRuntime(635):  at     android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1505)
09-02 17:14:53.835: E/AndroidRuntime(635):  at     android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1240)

我的类(class):

Android启动器

package com.JrodManU.LaserJumper.android;

import android.os.Bundle;

import com.badlogic.gdx.backends.android.AndroidApplication;
import com.badlogic.gdx.backends.android.AndroidApplicationConfiguration;
import com.JrodManU.LaserJumper.GameEventListener;
import com.JrodManU.LaserJumper.LaserJumper;

public class AndroidLauncher extends AndroidApplication implements GameEventListener {
    Ad ad = new Ad();
    @Override
    protected void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
        initialize(new LaserJumper(this), config);
    }

    @Override
    public void showAd() {
        ad.showAd();
    }

    @Override
    public void loadAd() {
        ad.loadAd();
    }

    @Override
    public boolean isShowing() {
        return ad.isShowing();
    }

    @Override
    public boolean isLoaded() {
        return ad.isLoaded();
    }
}

InGameScreen(屏幕类)

package com.JrodManU.LaserJumper.screens;

import com.JrodManU.LaserJumper.LaserJumper;

public class InGameScreen implements Screen {
    LaserJumper game;
    boolean firstTime;

    public InGameScreen(LaserJumper game) {
        this.game = game;
        game.loadAd();
        firstTime = true;
    }

    @Override
    public void render(float delta) {
        generalUpdate();
    }

    private void generalUpdate() {
        if(playerDied) {
            if(firstTime && game.isLoaded()) {
                System.out.println("hi");
                game.showAd();
                firstTime = false;
                while(game.isShowing()) {
                    //Waiting for the ad to go away..
                }
        }
    }   

广告

package com.JrodManU.LaserJumper.android;

import com.JrodManU.LaserJumper.GameEventListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.InterstitialAd;
import com.google.android.gms.ads.AdListener;

import android.app.Activity;
import android.os.Bundle;

public class Ad extends Activity implements GameEventListener{
    private InterstitialAd mInterstitialAd;
    public static boolean showing;
    public static boolean loaded;    

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mInterstitialAd = new InterstitialAd(this);
        mInterstitialAd.setAdUnitId("*****");
        AdRequest.Builder adRequestBuilder = new AdRequest.Builder();
        adRequestBuilder.addTestDevice(AdRequest.DEVICE_ID_EMULATOR);
        mInterstitialAd.setAdListener(new AdListener() {
            @Override
            public void onAdClosed() {
                showing = false;
            }

            @Override
            public void onAdLoaded() {
                loaded = true;
            }
        });
    }

    public void showAd() {
        if (mInterstitialAd.isLoaded()) {
            mInterstitialAd.show();
            showing = true;
        }
    }

    public void loadAd() {
        AdRequest.Builder adRequestBuilder = new AdRequest.Builder();
        mInterstitialAd.loadAd(adRequestBuilder.build());
    }

    public boolean isShowing() {
        if(showing) {
            return true;
        } else {
            return false;
        }
    }

    public boolean isLoaded() {
        if(loaded) {
            return true;
        } else {
            return false;
        }
    }
}

LaserJumper(主类)

package com.JrodManU.LaserJumper;

import com.JrodManU.LaserJumper.screens.*;
import com.badlogic.gdx.Game;

public class LaserJumper extends Game{
    InGameScreen inGameScreen;
    public Preferences preferences;
    public GameEventListener gameEventListener;
    @Override
    public void create() {
        inGameScreen = new InGameScreen(this);
        setScreen(inGameScreen);
    }

    public void changeToInGame() {
        inGameScreen = new InGameScreen(this);
        setScreen(inGameScreen);
    }

    public LaserJumper(GameEventListener listener) {
        gameEventListener = listener;
    }

    public void showAd() {
        gameEventListener.showAd();
    }

    public void loadAd() {
        gameEventListener.loadAd();
    }

    public boolean isShowing() {
        return gameEventListener.isShowing();
    }

    public boolean isLoaded() {
        return gameEventListener.isLoaded();
    }
}

最后是 GameEventListener 接口(interface)

package com.JrodManU.LaserJumper;

public interface GameEventListener {
    public void showAd();
    public void loadAd();
    public boolean isShowing();
    public boolean isLoaded();
}

Answer 1

您的插页式广告位于单独的 Activity Ad 内，然后您可以像这样直接实例化它 Ad ad = new Ad();

你永远不应该像这样实例化Android Activity(它们启动Activity的方式是使用Intents)，因为Activity必须遵守Activity lifecycle Android 将通过 Activity 生命周期方法进行调用。

结果是广告 Activity 的 onCreate() 方法不会被调用，并且您的 InterstitialAd 从未被实例化，这会导致稍后出现 NPE。

<小时/>

解决方案建议:

• 不要为插页式广告创建额外的 Activity 。这根本没有必要。而是将插页式广告初始化移至 AndroidLauncher 内。
• 使用处理程序来管理广告的显示/隐藏。此处描述:libgdx admob wiki 。 (本教程引用了旧版 admob，但与新版 admob 的差异很小，我仍然认为它是最好的教程)它的工作方式与普通横幅的工作方式几乎相同。