地理围栏和GoogleApiClient

Question

我正在为我的应用程序使用地理围栏，我遵循了声明为here的步骤，但每次我尝试初始化GoogleApiClient时，我都无法收到任何呼叫backs..following是我的代码。

mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks((GoogleApiClient.ConnectionCallbacks)this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API).build();

我得到一个强制关闭错误

java.lang.IllegalStateException: GoogleApiClient is not connected yet.

onCreate()中的代码

geoFence = new Geofence.Builder()
            .setRequestId("DVSN")
            .setCircularRegion(18.5553785, 73.8164671, 10)
            .setExpirationDuration(43200000)
            .setTransitionTypes(
                    Geofence.GEOFENCE_TRANSITION_ENTER
                            | Geofence.GEOFENCE_TRANSITION_EXIT).build();
    LocationServices.GeofencingApi.addGeofences(
            mGoogleApiClient,
            getGeofencingRequest(),
            getGeofencePendingIntent()
    ).setResultCallback(this);

私有方法

private GeofencingRequest getGeofencingRequest() {
    GeofencingRequest.Builder builder = new GeofencingRequest.Builder();
    builder.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER);
    builder.addGeofence(geoFence);
    return builder.build();
}

private PendingIntent getGeofencePendingIntent() {
    // Reuse the PendingIntent if we already have it.
    Intent intent = new Intent(this, GeofenceTransitionsIntentService.class);
    // We use FLAG_UPDATE_CURRENT so that we get the same pending intent
    // back when
    // calling addGeofences() and removeGeofences().
    return PendingIntent.getService(this, 0, intent,
            PendingIntent.FLAG_UPDATE_CURRENT);
}

Answer 1

首先连接您的GoogleApiClient，然后将Geofence添加到GeofencingApi。

mApiClient = new GoogleApiClient.Builder(mContext)
             .addApi(LocationServices.API)
             .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
                  @Override
                  public void onConnected(Bundle bundle) {
                     Log.i(TAG, "Connected to GoogleApiClient");
                     addGeofencesOnLoad();
                  }
                  @Override
                  public void onConnectionSuspended(int i) {
                   }
              }).build();
mApiClient.connect();


public void addGeofencesOnLoad() {
    if (!mGoogleApiClient.isConnected()) {
        Toast.makeText(this, getString(R.string.not_connected), Toast.LENGTH_SHORT).show();
        return;
    }

 try {
    LocationServices.GeofencingApi.addGeofences(
            mGoogleApiClient,
            getGeofencingRequest(),
            getGeofencePendingIntent()
    ).setResultCallback(this); // Result processed in onResult().
 } catch (SecurityException securityException) {
    logSecurityException(securityException);
 }
}

首先，使用Geofence.Builder创建geofence，为geofence设置所需的半径、持续时间和过渡类型。例如，要填充一个名为mGeofenceList的列表对象

mGeofenceList.add(new Geofence.Builder()
// Set the request ID of the geofence. This is a string to identify this
// geofence.
.setRequestId(entry.getKey())

.setCircularRegion(
        entry.getValue().latitude,
        entry.getValue().longitude,
        Constants.GEOFENCE_RADIUS_IN_METERS
)
.setExpirationDuration(Constants.GEOFENCE_EXPIRATION_IN_MILLISECONDS)
.setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER |
        Geofence.GEOFENCE_TRANSITION_EXIT)
.build());

以下代码段使用GeofencingRequest类及其嵌套的GeofencingRequestBuilder类指定要监视的geofence并设置相关geofence事件的触发方式

private GeofencingRequest getGeofencingRequest() {
    GeofencingRequest.Builder builder = new GeofencingRequest.Builder();
    builder.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER);
    builder.addGeofences(mGeofenceList);
    return builder.build();
}

以下代码片段显示了如何定义启动IntentService的PendingIntent

private PendingIntent getGeofencePendingIntent() {
    // Reuse the PendingIntent if we already have it.
    if (mGeofencePendingIntent != null) {
        return mGeofencePendingIntent;
    }
    Intent intent = new Intent(this, GeofenceTransitionsIntentService.class);
    // We use FLAG_UPDATE_CURRENT so that we get the same pending intent back when
    // calling addGeofences() and removeGeofences().
    return PendingIntent.getService(this, 0, intent, PendingIntent.
            FLAG_UPDATE_CURRENT);
}