点击Android应用中的Google+登录按钮时出错

Question

我正在尝试使用Google+播放服务登录我的应用。代码没有任何错误，它会在模拟器中启动。但是当我点击“使用google登录”按钮时，我在logcat中收到此错误

我不确定为什么会发生这种情况。这是我的MainActivity课程：

import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.IntentSender.SendIntentException;
import android.util.Log;
import android.view.*;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.gms.common.*;
import com.google.android.gms.common.GooglePlayServicesClient.*;
import com.google.android.gms.plus.PlusClient;


public class MainActivity extends Activity implements View.OnClickListener,
ConnectionCallbacks, OnConnectionFailedListener{

private static final String TAG = "MainActivity";
private static final int REQUEST_CODE_RESOLVE_ERR = 9000;
private Button signInButton;
private ProgressDialog mConnectionProgressDialog;
private static PlusClient mPlusClient;
private ConnectionResult mConnectionResult;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mPlusClient = new PlusClient.Builder(this, this, this)
    .setActions("http://schemas.google.com/AddActivity", "http://schemas.google.com/  BuyActivity")
    .setScopes("PLUS_LOGIN")  // Space separated list of scopes
    .build();
    // Progress bar to be displayed if the connection failure is not resolved.
    mConnectionProgressDialog = new ProgressDialog(this);
    mConnectionProgressDialog.setMessage("Signing in...");

    signInButton =(Button) findViewById(R.id.sign_in_button);
    signInButton.setOnClickListener(this);

}
public static PlusClient getPlusClientObject() {
    return mPlusClient;
}

protected void onStart() {
    super.onStart();
    mPlusClient.connect();
}
protected void onStop() {
    super.onStop();
    mPlusClient.disconnect();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);

    //signInButton =(Button) findViewById(R.id.sign_in_button);
    //signInButton.setOnClickListener(this);
    return true;
}

@Override
public void onConnectionFailed(ConnectionResult result) {
     if (mConnectionProgressDialog.isShowing()) {
            // The user clicked the sign-in button already. Start to resolve
            // connection errors. Wait until onConnected() to dismiss the
            // connection dialog.
            if (result.hasResolution()) {
              try {
                       result.startResolutionForResult(this, REQUEST_CODE_RESOLVE_ERR);
               } catch (SendIntentException e) {
                       mPlusClient.connect();
               }
            }
          }
          // Save the result and resolve the connection failure upon a user click.
          mConnectionResult = result;

}

protected void onActivityResult(int requestCode, int responseCode, Intent intent) {
    if (requestCode == REQUEST_CODE_RESOLVE_ERR && responseCode == RESULT_OK) {
        mConnectionResult = null;
        mPlusClient.connect();
    }
}

@Override
public void onConnected(Bundle connectionHint) { //this is called when the user has successfully signed in
     String accountName = mPlusClient.getAccountName();
        Toast.makeText(this, accountName + " is connected.", Toast.LENGTH_LONG).show();
        Intent logoutIntention = new Intent(this, LogoutActivity.class);
        startActivity(logoutIntention);
}

@Override
public void onDisconnected() {
     Log.d(TAG, "disconnected");

}


@Override
public void onClick(View view) {

    if (view.getId() == R.id.sign_in_button && !mPlusClient.isConnected()) {
        if (mConnectionResult == null) {
            mConnectionProgressDialog.show();
        } else {
            try {
                mConnectionResult.startResolutionForResult(this, REQUEST_CODE_RESOLVE_ERR);
            } catch (SendIntentException e) {
                // Try connecting again.
                mConnectionResult = null;
                mPlusClient.connect();
            }
        }
    }
}

}

和我的应用引用google-play-services_lib具有以下结构：

我不确定为什么会发生这种情况。任何人都可以帮忙吗？

以下是我的模拟器的定义：