無法解析mGoogleApiClient

Question

爲什麼錯誤mGoogleApiClient？ 這是我的gradle產出：

compile 'com.android.support:appcompat-v7:26.+' 
compile 'com.google.android.gms:play-services-maps:11.0.4' 
compile 'com.google.android.gms:play-services-location:11.0.4' 
testCompile 'junit:junit:4.12' 

，這我的源代碼：

@Override 
public void onConnected(@Nullable Bundle bundle) { 
    LocationRequest mLocationRequest = new LocationRequest(); 
    mLocationRequest.setInterval(1000); 
    mLocationRequest.setFastestInterval(1000); 
    mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY); 
    if (ContextCompat.checkSelfPermission(this, 
      android.Manifest.permission.ACCESS_FINE_LOCATION) 
      == PackageManager.PERMISSION_GRANTED) { 
     LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this); 
    } 
} 

Answer 1

因爲您尚未創建對象 mGoogleApiClient檢查文檔和正確使用之前創建它。

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

文檔：https://developers.google.com/android/reference/com/google/android/gms/location/FusedLocationProviderApi