实现Google Play游戏服务-如何让用户登录

Question

这是我第一次使用google API，因为我对android编程相当陌生。我一直在尝试在我的应用中执行google play游戏服务并显示排行榜(这是一款游戏，你可能已经猜到了)，并且在遵循google的文档方面遇到了一些困难。

我已经设置了一个按钮，并希望让用户在点击时登录，并让用户登录，直到他们登出之后。我按照文档编写了这个程序:

public class MainActivity extends AppCompatActivity implements View.OnClickListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
  Button bLeaderboard;
  private GoogleApiClient mGoogleApiClient;
  private static int RC_SIGN_IN = 9001;
  private boolean mResolvingConnectionFailure = false;
  private boolean mAutoStartSignInflow = true;
  private boolean mSignInClicked = false;

@Override
@SuppressLint("NewApi")
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    bLeaderboard = (Button) findViewById(R.id.bLeaderboard);
    bLeaderboard.setOnClickListener(this);
     mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(Games.API).addScope(Games.SCOPE_GAMES)
            .build();
}
@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.bLeaderboard:
            mSignInClicked = true;
            mGoogleApiClient.connect();
}
}

问题是，每当我点击排行榜按钮时，应用程序就会崩溃，我得到这样的错误信息:

AndroidRuntime: FATAL EXCEPTION: maincom . example。过程:游戏，PID: 26284java.lang.IllegalStateException:发生了致命的开发错误。查看日志以获取更多信息。$zza.zzc(来源不明)$zza.zzv(来源不明)$zze.zzasf(来源不明)$zzd.handleMessage(来源未知)android.os.Handler.dispatchMessage (Handler.java: 102)android.os.Looper.loop (Looper.java: 148)android.app.ActivityThread.main (ActivityThread.java: 5417)在java.lang.reflect.Method。调用(本地方法)com.android.internal.os.ZygoteInit MethodAndArgsCaller.run美元(ZygoteInit.java: 726)com.android.internal.os.ZygoteInit.main (ZygoteInit.java: 616)

我也一直无法理解如何处理这三个实现的方法:

@Override
public void onConnected(@Nullable Bundle bundle) {
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}

任何帮助都非常感谢，因为除了谷歌的文档之外，我没有找到任何关于这方面的教程，正如我之前所说的，我很难理解和遵循

Answer 1

这对我来说是正确的

 public class MainActivity extends ActionBarActivity implements  GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
// Client used to interact with Google APIs
private GoogleApiClient mGoogleApiClient;
private static int RC_SIGN_IN = 9001;
private boolean mResolvingConnectionFailure = false;
private boolean mAutoStartSignInflow = true;
private boolean mSignInClicked = false;
GameHelper gameHelper;

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

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(Games.API).addScope(Games.SCOPE_GAMES)
            .build();
    gameHelper = new GameHelper(this, GameHelper.CLIENT_GAMES);
    gameHelper.enableDebugLog(true);
    gameHelper.setup(new GameHelper.GameHelperListener() {
        @Override
        public void onSignInFailed() {
        Toast.makeText(getApplicationContext(),"Please Check Your Internet Connection!",Toast.LENGTH_LONG).show();
        }
        @Override
        public void onSignInSucceeded() {
            Toast.makeText(getApplicationContext(),"Signed in Succeed",Toast.LENGTH_LONG).show();
        }
    });

    setContentView(view);
    //for load all Score card

    scorecard=(Button)findViewById(R.id.score_card);
    scorecard.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            startActivityForResult(Games.Leaderboards.getAllLeaderboardsIntent(mGoogleApiClient), 1);
        }
    });


}
private boolean isScoreResultValid(final Leaderboards.LoadPlayerScoreResult scoreResult) {
    return scoreResult != null && GamesStatusCodes.STATUS_OK == scoreResult.getStatus().getStatusCode() && scoreResult.getScore() != null;
}

@Override
protected void onStart() {
    super.onStart();
    mGoogleApiClient.connect();
}
@Override
protected void onStop() {
    super.onStop();
    mGoogleApiClient.disconnect();
}
@Override
public void onConnected(Bundle connectionHint) {
    // The player is signed in. Hide the sign-in button and allow the
    // player to proceed.
    // now submit your high_score
    Games.Leaderboards.submitScore(mGoogleApiClient,getResources().getString(R.string.leaderboard_easy),high_score);
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
    if (mResolvingConnectionFailure) {
        // already resolving
        return;
    }
    // if the sign-in button was clicked or if auto sign-in is enabled,
    // launch the sign-in flow
    if (mSignInClicked || mAutoStartSignInflow) {
        mAutoStartSignInflow = false;
        mSignInClicked = false;
        mResolvingConnectionFailure = true;
        // Attempt to resolve the connection failure using BaseGameUtils.
        // The R.string.signin_other_error value should reference a generic
        // error string in your strings.xml file, such as "There was
        // an issue with sign-in, please try again later."
        /*if (!BaseGameUtils.resolveConnectionFailure(this,
                mGoogleApiClient, connectionResult,
                RC_SIGN_IN, "Sign in error")) {
            mResolvingConnectionFailure = false;
        }*/
    }
    // Put code here to display the sign-in button
}
@Override
public void onConnectionSuspended(int i) {
    // Attempt to reconnect
    mGoogleApiClient.connect();
}

protected void onActivityResult(int requestCode, int resultCode,
                                Intent intent) {
    if (requestCode == RC_SIGN_IN) {
        mSignInClicked = false;
        mResolvingConnectionFailure = false;
        if (resultCode == RESULT_OK) {
            mGoogleApiClient.connect();
        } else {
            // Bring up an error dialog to alert the user that sign-in
            // failed. The R.string.signin_failure should reference an error
            // string in your strings.xml file that tells the user they
            // could not be signed in, such as "Unable to sign in."
            BaseGameUtils.showActivityResultError(this,
                    requestCode, resultCode, R.string.signin_failure);
        }
    }
}
// Call when the sign-in button is clicked
private void signInClicked() {
    mSignInClicked = true;
    mGoogleApiClient.connect();
}
// Call when the sign-out button is clicked
private void signOutclicked() {
    mSignInClicked = false;
    Games.signOut(mGoogleApiClient);
}
 }