LibGDX 和 GoogleApiClient setup/integration（第一次）

Question

我无法尝试添加 Google Play，然后在 Play 商店中发布我的应用程序。我通过实施屏幕 class 在 LibGDX 中实现了它，现在 Google 指南突然试图让我创建 layout.xml 并将大量新内容添加到我的应用程序只是为了获得一个愚蠢的 "sign-in" 按钮。

关于此主题的 Google 文档几乎不可能与 LibGDX 项目一起使用，而且 LibGDX 社区论坛上也没有太多帮助。

这不会那么难，我显然错过了一些简单的东西！我相信我的 GoogleApiClient 和我自己的界面设置正常，并且我现在需要它的所有 classes 中都有一个 GoogleApiClient 的实例，没有错误。

当我尝试制作愚蠢的布局并将其放在我的应用程序的开头时出现错误（IE。我尝试创建一个只有登录按钮的简单 layout.xml，一次玩家点击登录应用程序将像往常一样通过在 LibGDX Android 启动器中调用 "initialize..." 来启动。

目前我收到这个错误：

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.megabro.flappyturd, PID: 3799
                  java.lang.RuntimeException: Unable to resume activity {com.megabro.flappyturd/com.megabro.flappyturd.AndroidLauncher}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.badlogic.gdx.backends.android.AndroidInput.onResume()' on a null object reference
                      at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3400)
                      at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3440)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2713)
                      at android.app.ActivityThread.-wrap12(ActivityThread.java)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
                      at android.os.Handler.dispatchMessage(Handler.java:102)
                      at android.os.Looper.loop(Looper.java:154)
                      at android.app.ActivityThread.main(ActivityThread.java:6077)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
                   Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.badlogic.gdx.backends.android.AndroidInput.onResume()' on a null object reference
                      at com.badlogic.gdx.backends.android.AndroidApplication.onResume(AndroidApplication.java:299)
                      at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1269)
                      at android.app.Activity.performResume(Activity.java:6766)
                      at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3377)
                      at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3440) 
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2713) 
                      at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 
                      at android.os.Handler.dispatchMessage(Handler.java:102) 
                      at android.os.Looper.loop(Looper.java:154) 
                      at android.app.ActivityThread.main(ActivityThread.java:6077) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

我正在将导致问题的整个代码发布到 Pastebin 上，将 link 放在这里：

http://pastebin.com/F6sqQPDc

Answer 1

希望您使用的是 Intellij 或 Android Studio。

如果是，请将 BaseGameUtils 集成到您的项目中

https://github.com/libgdx/libgdx/wiki/Google-Play-Game-Services-in-LibGDX#intellij-and-android-studio-setup

public class MainActivity extends AndroidApplication implements GameHelperListener, ActionResolver {
    private GameHelper gameHelper;

    @Override
    public void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initialize(new TutorialLibgdxGameservices(this), false);
    if (gameHelper == null) {
      gameHelper = new GameHelper(this, GameHelper.CLIENT_GAMES);
      gameHelper.enableDebugLog(true);
    }
    gameHelper.setup(this);
    }

    @Override
    public void onStart(){
        super.onStart();
        gameHelper.onStart(this);
    }

    @Override
    public void onStop(){
        super.onStop();
        gameHelper.onStop();
    }

    @Override
    public void onActivityResult(int request, int response, Intent data) {
        super.onActivityResult(request, response, data);
        gameHelper.onActivityResult(request, response, data);
    }

    @Override
    public boolean getSignedInGPGS() {
        return gameHelper.isSignedIn();
    }

    @Override
    public void loginGPGS() {
        try {
            runOnUiThread(new Runnable(){
                public void run() {
                    gameHelper.beginUserInitiatedSignIn();
                }
            });
        } catch (final Exception ex) {
        }
    }

    @Override
    public void submitScoreGPGS(int score) {
        Games.Leaderboards.submitScore(gameHelper.getApiClient(), "CgkI6574wJUXEAIQBw", score);
    }

    @Override
    public void unlockAchievementGPGS(String achievementId) {
      Games.Achievements.unlock(gameHelper.getApiClient(), achievementId);
    }

    @Override
    public void getLeaderboardGPGS() {
      if (gameHelper.isSignedIn()) {
        startActivityForResult(Games.Leaderboards.getLeaderboardIntent(gameHelper.getApiClient(), "CgkI6574wJUXEAIQBw"), 100);
      }
      else if (!gameHelper.isConnecting()) {
        loginGPGS();
      }
    }

    @Override
    public void getAchievementsGPGS() {
      if (gameHelper.isSignedIn()) {
        startActivityForResult(Games.Achievements.getAchievementsIntent(gameHelper.getApiClient()), 101);
      }
      else if (!gameHelper.isConnecting()) {
        loginGPGS();
      }
    }

    @Override
    public void onSignInFailed() {
    }

    @Override
    public void onSignInSucceeded() {
    }
}

并将 ActionResolver 保留在核心模块中以进行接口。

public interface ActionResolver {
    public boolean getSignedInGPGS();
    public void loginGPGS();
    public void submitScoreGPGS(int score);
    public void unlockAchievementGPGS(String achievementId);
    public void getLeaderboardGPGS();
    public void getAchievementsGPGS();
}

LibGDX 和 GoogleApiClient setup/integration（第一次）

LibGDX and the GoogleApiClient setup/integration (first time)

java

google-api

libgdx

google-api-client

google-play-services