Question

我正在尝试在我正在创建的安卓游戏中实现Facebook SDK。

我创建了一个主游戏，我的所有逻辑都发生了，我创建了一个使用主人的Android版本。希望这是有道理的。

无论如何为了触发按钮在我的主代码中按下android版本中的代码我试图使用接口来完成此操作但我不断收到以下错误;

致命的例外：GLThread 56457 显示java.lang.NullPointerException

我不确定我做错了什么，并感谢任何帮助。我把我的代码放在下面。

FacebookInterface.java（主）

package com.gksoftworks.ECHelpers;

public interface FacebookInterface {

    public void FacebookShare();

}

InputHandler.java（master）

package com.gksoftworks.ECHelpers;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input.Keys;
import com.badlogic.gdx.InputProcessor;
import com.gksoftworks.GameWorld.GameWorld;
import com.gksoftworks.ui.*;
import com.gksoftworks.GameObjects.Chick;

public class InputHandler implements InputProcessor {
private Chick myChick;
private GameWorld myWorld;

private List<SimpleButton> menuButtons;

private List<SimpleButton> gameOverButtons;

// List of all buttons
private SimpleButton easyButton;
private SimpleButton mediumButton;
private SimpleButton hardButton;
private SimpleButton randomButton;
private SimpleButton rateButton;
private SimpleButton shareButton;
private SimpleButton difficultyButton;
private SimpleButton retryButton;

private float scaleFactorX;
private float scaleFactorY;

private FacebookInterface fbInterface;

public InputHandler(GameWorld myWorld, float scaleFactorX,
        float scaleFactorY) {
    this.myWorld = myWorld;
    myChick = myWorld.getChick();

    int midPointY = myWorld.getMidPointY();

    this.scaleFactorX = scaleFactorX;
    this.scaleFactorY = scaleFactorY;

    menuButtons = new ArrayList<SimpleButton>();

    gameOverButtons = new ArrayList<SimpleButton>();

    // Add the easy button
    easyButton = new SimpleButton(
            136 / 2 - (AssetLoader.easyButton.getRegionWidth() / 2),
            midPointY + -11, 24, 16, AssetLoader.easyButton,
            AssetLoader.easyButton);
    menuButtons.add(easyButton);

    // Add the medium button
    mediumButton = new SimpleButton(
            136 / 2 - (AssetLoader.mediumButton.getRegionWidth() / 2),
            midPointY + 9, 35, 16, AssetLoader.mediumButton,
            AssetLoader.mediumButton);
    menuButtons.add(mediumButton);

    // Add the hard button
    hardButton = new SimpleButton(
            136 / 2 - (AssetLoader.hardButton.getRegionWidth() / 2),
            midPointY + 29, 25, 16, AssetLoader.hardButton,
            AssetLoader.hardButton);
    menuButtons.add(hardButton);

    // Add the random button
    randomButton = new SimpleButton(
            136 / 2 - (AssetLoader.randomButton.getRegionWidth() / 2),
            midPointY + 48, 37, 16, AssetLoader.randomButton,
            AssetLoader.randomButton);
    menuButtons.add(randomButton);

    // Add the rate button
    rateButton = new SimpleButton(5, 2, 60, 16, AssetLoader.rateButton, AssetLoader.rateButton);
    menuButtons.add(rateButton);

    // Add the share button
    shareButton = new SimpleButton(70, 2, 60, 16, AssetLoader.shareButton, AssetLoader.shareButton);
    menuButtons.add(shareButton);

    // Add the rate button
    difficultyButton = new SimpleButton(
            136 / 2 - (AssetLoader.difficultyButton.getRegionWidth() / 2),
            midPointY + 16, 65, 16, AssetLoader.difficultyButton,
            AssetLoader.difficultyButton);
    gameOverButtons.add(difficultyButton);

    // Add the rate button
    retryButton = new SimpleButton(
            136 / 2 - (AssetLoader.retry.getRegionWidth() / 2),
            midPointY + 38, 33, 16, AssetLoader.retry,
            AssetLoader.retry);
    gameOverButtons.add(retryButton);

}

@Override
public boolean touchDown(int screenX, int screenY, int pointer, int button) {
    screenX = scaleX(screenX);
    screenY = scaleY(screenY);

    if (myWorld.isMenu()) {
        easyButton.isTouchDown(screenX, screenY);
        mediumButton.isTouchDown(screenX, screenY);
        hardButton.isTouchDown(screenX, screenY);
        randomButton.isTouchDown(screenX, screenY);
        rateButton.isTouchDown(screenX, screenY);
        shareButton.isTouchDown(screenX, screenY);
    } else if (myWorld.isReady()) {
        myWorld.start();
        myChick.onClick();
    } else if (myWorld.isRunning()) {
        myChick.onClick();
    }

    if (myWorld.isGameOver() || myWorld.isHighScore()) {
        difficultyButton.isTouchDown(screenX, screenY);
        retryButton.isTouchDown(screenX, screenY);
    }

    return true;
}

@Override
public boolean touchUp(int screenX, int screenY, int pointer, int button) {
    screenX = scaleX(screenX);
    screenY = scaleY(screenY);

    if (myWorld.isMenu()) { 
        if (easyButton.isTouchUp(screenX, screenY)) {
            myWorld.ready(1);
            return true;
        } else if (mediumButton.isTouchUp(screenX, screenY)) {
            myWorld.ready(2);
            return true;
        } else if (hardButton.isTouchUp(screenX, screenY)) {
            myWorld.ready(3);
            return true;
        } else if (randomButton.isTouchUp(screenX, screenY)) {
            myWorld.ready(4);
            return true;
        } else if (rateButton.isTouchUp(screenX, screenY)) {
            Gdx.net.openURI("https://play.google.com/store/apps/details?id=com.gksoftworks.EasterChick");
        } else if (shareButton.isTouchUp(screenX, screenY)) {
            fbInterface.FacebookShare();
        }
    } else if (myWorld.isGameOver()) {
        if (difficultyButton.isTouchUp(screenX, screenY)) {
            myWorld.restart(true);
        } else if (retryButton.isTouchUp(screenX, screenY)) {
            myWorld.restart(false);
        }
    }

    return false;
}

@Override
public boolean keyUp(int keycode) {
    return false;
}

@Override
public boolean keyTyped(char character) {
    return false;
}

@Override
public boolean touchDragged(int screenX, int screenY, int pointer) {
    return false;
}

@Override
public boolean mouseMoved(int screenX, int screenY) {
    return false;
}

@Override
public boolean scrolled(int amount) {
    return false;
}

private int scaleX(int screenX) {
    return (int) (screenX / scaleFactorX);
}

private int scaleY(int screenY) {
    return (int) (screenY / scaleFactorY);
}

public List<SimpleButton> getMenuButtons() {
    return menuButtons;
}

public List<SimpleButton> getGameOverButtons() {
    return gameOverButtons;
}

@Override
public boolean keyDown(int keycode) {
    // TODO Auto-generated method stub
    return false;
}


}

所以我在这里创建了我的Facebook界面，并在按下分享按钮时使用它。

MainActivity.java（Android）

package com.gksoftworks.EasterChick;

import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.RelativeLayout;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.backends.android.AndroidApplication;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdSize;
import com.google.android.gms.ads.AdView;
import com.gksoftworks.ECHelpers.FacebookInterface;
//import com.google.android.gms.ads.InterstitialAd;
import com.gksoftworks.EasterChick.ECGame;

public class MainActivity extends AndroidApplication implements FacebookInterface {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Create the layout
    RelativeLayout layout = new RelativeLayout(this);

    // Do the stuff that initialize() would do for you
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
    getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);

    // Create the libgdx View
    View gameView = initializeForView(new ECGame(), false);

    // Create and setup the AdMob view
    AdView adView = new AdView(this);
    adView.setAdSize(AdSize.SMART_BANNER);
    adView.setAdUnitId("ca-app-pub-0674036768511172/5754826717");


    // Create an ad request. Check logcat output for the hashed device ID to
    // get test ads on a physical device.
    AdRequest adRequestBanner = new AdRequest.Builder()
        .addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
        .addTestDevice("CB5125BK84")
        .build();

    // Start loading the ad in the background.
    adView.loadAd(adRequestBanner);

    // Add the libgdx view
    layout.addView(gameView);

    // Add the AdMob view
    RelativeLayout.LayoutParams adParams = 
            new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                            RelativeLayout.LayoutParams.WRAP_CONTENT);
    adParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
    adParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

    layout.addView(adView, adParams);

    // Hook it all up
    setContentView(layout);

}

@Override
public void FacebookShare(){
     Gdx.app.log("AndroidGame","Hello Android");
} 


}

所以我把它作为这个活动的一部分实现，我得到了错误。当我按下按钮时它不会在logcat中显示我在Android中完成的代码吗？

有人可以帮忙吗？

Answer 1

我如何总是这样做，有点像你，创建一个接口，一些函数通过它调用MainActivity并在核心项目的主游戏类中初始化它。

Game.java

    public static FacebookInterface myRequestHandler;

    public Game(FacebookInterface handler) {
         myRequestHandler = handler;
    }

    @Override
    public void create() {
         setScreen(new Splash());
    }

    @Override
         public void dispose() {
         super.dispose();
    }

    etc...

然后我只是在任何类中调用它（不要忘记导入Game类），例如，使用

    Game.myRequestHandler.FacebookShare();

放手一搏，希望它能奏效。

Answer 2

可能存在更大的问题，但看起来InputHandler中的变量尚未初始化，因此myWorld为空（以及按钮）。

Answer 3

FacebookInterface fbInterface定义不初始化，初始化类必须创建它的实例。因为你有接口，你可能需要创建实现FacebookInterface接口

的类

您可以使用匿名类

FacebookInterface fbInterface = new FacebookInterface(){
    @Override
    public void FacebookShare(){
        Gdx.app.log("AndroidGame","Hello Android");
   } 
}

应修复您的NullPointerException

在游戏和Android游戏之间创建界面

3 个答案: