为什么我得到＆＃34; GoogleApiClient不能为空＆＃34;当试图连接磨损和Android应用程序？

Question

我跟随本教程，尝试让我的磨损应用和移动应用进行通信。

https://www.binpress.com/tutorial/a-guide-to-the-android-wear-message-api/152

我认为必须省略解决方案的某些部分，因为我一直在崩溃：

E/AndroidRuntime: FATAL EXCEPTION: Thread-4
                  Process: com.webiphany.wearsync, PID: 27299
                  java.lang.NullPointerException: GoogleApiClient must not be null
                      at com.google.android.gms.common.internal.zzac.zzb(Unknown Source)
                      at com.google.android.gms.internal.zzzv$zza.<init>(Unknown Source)
                      at com.google.android.gms.wearable.internal.zzm.<init>(Unknown Source)
                      at com.google.android.gms.wearable.internal.zzcb$2.<init>(Unknown Source)
                      at com.google.android.gms.wearable.internal.zzcb.getConnectedNodes(Unknown Source)
                      at com.webiphany.wearsync.MainActivity$2.run(MainActivity.java:61)
                      at java.lang.Thread.run(Thread.java:761)

我的服装和移动应用程序在这里：

https://github.com/xrd/WearSync

磨损应用程序的相关连接代码如下：

https://github.com/xrd/WearSync/blob/master/wear/src/main/java/com/webiphany/wearsync/MainActivity.java#L75

private void initGoogleApiClient() {
    mApiClient = new GoogleApiClient.Builder( this )
            .addApi( Wearable.API )
            .build();

    mApiClient.connect();
}

Android应用程序的连接代码在这里：

https://github.com/xrd/WearSync/blob/master/mobile/src/main/java/com/webiphany/wearsync/MainActivity.java#L79

private void setupDataLayer() {
        GoogleApiClient mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
                    @Override
                    public void onConnected(Bundle connectionHint) {
                        Log.d(TAG, "onConnected: " + connectionHint);
                        // Now you can use the Data Layer API

                        sendMessage( START_ACTIVITY, "" );
                    }
                    @Override
                    public void onConnectionSuspended(int cause) {
                        Log.d(TAG, "onConnectionSuspended: " + cause);
                    }
                })
                .addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener() {
                    @Override
                    public void onConnectionFailed(ConnectionResult result) {
                        Log.d(TAG, "onConnectionFailed: " + result);
                    }
                })
                // Request access only to the Wearable API
                .addApi(Wearable.API)
                .build();

    }

有关我做错的任何建议吗？