我有一个主要活动，我有一个意图进行GooglePlus活动的按钮。
以下是GooglePlus.java最多onCreateView()的代码：
import java.io.InputStream;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentSender.SendIntentException;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.plus.Plus;
import com.google.android.gms.plus.model.people.Person;
public class GooglePlus extends Activity implements OnClickListener,
ConnectionCallbacks, OnConnectionFailedListener {
private static final int RC_SIGN_IN = 0;
// Logcat tag
private static final String TAG = "MainActivity";
// Profile pic image size in pixels
private static final int PROFILE_PIC_SIZE = 400;
// Google client to interact with Google API
private GoogleApiClient mGoogleApiClient;
/**
* A flag indicating that a PendingIntent is in progress and prevents us
* from starting further intents.
*/
private boolean mIntentInProgress;
private boolean mSignInClicked;
private ConnectionResult mConnectionResult;
private SignInButton btnSignIn;
private Button btnSignOut, btnRevokeAccess;
private ImageView imgProfilePic;
private TextView txtName, txtEmail;
private LinearLayout llProfileLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d("my", "in oncreateview");
super.onCreate(savedInstanceState);
setContentView(R.layout.googleplus);
Log.d("my", "setcontentview is correct");
btnSignIn = (SignInButton) findViewById(R.id.btn_sign_in);
btnSignOut = (Button) findViewById(R.id.btn_sign_out);
btnRevokeAccess = (Button) findViewById(R.id.btn_revoke_access);
imgProfilePic = (ImageView) findViewById(R.id.imgProfilePic);
txtName = (TextView) findViewById(R.id.txtName);
txtEmail = (TextView) findViewById(R.id.txtEmail);
llProfileLayout = (LinearLayout) findViewById(R.id.llProfile);
Log.d("my", "layout mapped");
// Button click listeners
btnSignIn.setOnClickListener(this);
btnSignOut.setOnClickListener(this);
btnRevokeAccess.setOnClickListener(this);
Log.d("my", "listeners are correct");
// Initializing google plus api client
//ERROR IS POSSIBLY HERE:
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).addApi(Plus.API, null)
.addScope(Plus.SCOPE_PLUS_LOGIN).build();
Log.d("my", " Initialized google plus api client");
}
my标记的logcat过滤器如下：
10-05 17:21:52.890: D/my(20539): intent started
10-05 17:21:52.910: D/my(20539): in oncreateview
10-05 17:21:52.920: D/my(20539): setcontentview is correct
10-05 17:21:52.920: D/my(20539): layout mapped
10-05 17:21:52.920: D/my(20539): listeners are correct
因此，错误在于初始化google plus api客户端。我试了一个小时，但无法确定问题。
logcat原始错误日志是：
10-05 17:21:52.920: E/AndroidRuntime(20539): in writeCrashedAppName, pkgName :com.example.mapsdemo
10-05 17:21:52.920: E/AndroidRuntime(20539): FileNotFoundException while trying to write in crash app file
10-05 17:21:52.920: E/AndroidRuntime(20539): FATAL EXCEPTION: main
10-05 17:21:52.920: E/AndroidRuntime(20539): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mapsdemo/com.example.mapsdemo.GooglePlus}: java.lang.NullPointerException: Null options are not permitted for this Api
10-05 17:21:52.920: E/AndroidRuntime(20539): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
10-05 17:21:52.920: E/AndroidRuntime(20539): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
10-05 17:21:52.920: E/AndroidRuntime(20539): at android.app.ActivityThread.access$600(ActivityThread.java:123)
10-05 17:21:52.920: E/AndroidRuntime(20539): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
10-05 17:21:52.920: E/AndroidRuntime(20539): at android.os.Handler.dispatchMessage(Handler.java:99)
10-05 17:21:52.920: E/AndroidRuntime(20539): at android.os.Looper.loop(Looper.java:137)
10-05 17:21:52.920: E/AndroidRuntime(20539): at android.app.ActivityThread.main(ActivityThread.java:4424)
10-05 17:21:52.920: E/AndroidRuntime(20539): at java.lang.reflect.Method.invokeNative(Native Method)
10-05 17:21:52.920: E/AndroidRuntime(20539): at java.lang.reflect.Method.invoke(Method.java:511)
10-05 17:21:52.920: E/AndroidRuntime(20539): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
10-05 17:21:52.920: E/AndroidRuntime(20539): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:592)
10-05 17:21:52.920: E/AndroidRuntime(20539): at dalvik.system.NativeStart.main(Native Method)
以下是清单代码：
<permission
android:name="com.example.mapsdemo.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.example.mapsdemo.permission.MAPS_RECEIVE" />
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!-- Required to show current location -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" />
<!-- Required OpenGL ES 2.0. for Maps V2 -->
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.facebook.LoginActivity"
android:label="@string/app_name" >
</activity>
<!-- Goolge Maps API Key -->
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.facebook.sdk.ApplicationId"
android:value="@string/facebook_app_id" />
<activity
android:name=".GooglePlus"
android:label="@string/title_activity_google_plus" >
</activity>
</application>
我错过了什么吗？请帮助。
答案 0 :(得分：5)
最后我解决了错误：
发生错误是因为Google plus API不允许使用Null选项。
更正addApi(Plus.API,null)至addApi(Plus.API)。
所以，最后继续工作：
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).addApi(Plus.API)
.addScope(Plus.SCOPE_PLUS_LOGIN).build();
Log.d("my", " Initialized google plus api client");
}
答案 1 :(得分：0)
.addApi（Plus.API，Plus.PlusOptions.builder（）。build（））