LibGDX和GoogleApiClient的设置/集成(第一次)

Question

我一直在尝试添加Google Play，然后在Play Store上发布我的应用程序。我在LibGDX中实现了Screen类，现在突然间，谷歌指南试图让我创建layout.xml，并在我的应用程序中添加大量新内容，只是为了获得一个愚蠢的"登录"按钮。

关于这个主题的谷歌文档几乎不可能与LibGDX项目一起使用，而且在LibGDX社区论坛上也没有太多帮助。

这不会有那么难，我显然错过了一些简单的东西！我相信我已经设置好了GoogleApiClient和我自己的界面，并且我在所有现在需要它的类中都有一个GoogleApiCloud的实例，没有错误。

当我试图做出愚蠢的布局并将其放在我的应用程序的开头时，就会出现错误(即。我试图创建一个只有登录按钮的简单布局.xml，一旦玩家点击登录，应用程序就会像往常一样在LibGDX Android Launcher内调用"initialize…"。

目前我得到这个错误：

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) 

我在Pastebin上发布了导致问题的整个代码，并将链接放在这里：

http://pastebin.com/F6sqQPDc

Answer 1

希望您使用的是Intellij或Android Studio。

如果是，请在您的项目中集成BaseGameUtils

https://github.com/libgdx/libgdx/wiki/Google-Play-Game-Services-in-LibGDX#intellij-和安卓工作室设置

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保留在核心模块中用于接口。

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();
}