我想查询parse以返回存储在Parse Cloud上的名称列表。我实现了geoLocation，我使用getLatitude和getLongitutude到ParseGeoPoint来获取名称列表。
public class TakePhotoActivity extends BaseActivity implements RevealBackgroundView.OnStateChangeListener, LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
CameraHostProvider {
public static final String ARG_REVEAL_START_LOCATION = "reveal_start_location";
private static final Interpolator ACCELERATE_INTERPOLATOR = new AccelerateInterpolator();
private static final Interpolator DECELERATE_INTERPOLATOR = new DecelerateInterpolator();
private static final int STATE_TAKE_PHOTO = 0;
private static final int STATE_SETUP_PHOTO = 1;
/*
* Define a request code to send to Google Play services This code is returned in
* Activity.onActivityResult
*/
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
/*
* Constants for location update parameters
*/
// Milliseconds per second
private static final int MILLISECONDS_PER_SECOND = 1000;
// The update interval
private static final int UPDATE_INTERVAL_IN_SECONDS = 5;
// A fast interval ceiling
private static final int FAST_CEILING_IN_SECONDS = 1;
// Update interval in milliseconds
private static final long UPDATE_INTERVAL_IN_MILLISECONDS = MILLISECONDS_PER_SECOND
* UPDATE_INTERVAL_IN_SECONDS;
// A fast ceiling of update intervals, used when the app is visible
private static final long FAST_INTERVAL_CEILING_IN_MILLISECONDS = MILLISECONDS_PER_SECOND
* FAST_CEILING_IN_SECONDS;
@Bind(R.id.vRevealBackground)
RevealBackgroundView vRevealBackground;
@Bind(R.id.vPhotoRoot)
View vTakePhotoRoot;
@Bind(R.id.vShutter)
View vShutter;
@Bind(R.id.ivTakenPhoto)
ImageView ivTakenPhoto;
@Bind(R.id.vUpperPanel)
ViewSwitcher vUpperPanel;
@Bind(R.id.vLowerPanel)
ViewSwitcher vLowerPanel;
@Bind(R.id.cameraView)
CameraView cameraView;
@Bind(R.id.rvFilters)
RecyclerView rvFilters;
@Bind(R.id.btnTakePhoto)
Button btnTakePhoto;
private float radius;
private float lastRadius;
private boolean pendingIntro;
private int currentState;
private Location lastLocation;
private Location currentLocation;
// A request to connect to Location Services
private LocationRequest locationRequest;
// Stores the current instantiation of the location client in this object
private GoogleApiClient locationClient;
private File photoPath;
public static void startCameraFromLocation(int[] startingLocation, Activity startingActivity) {
Intent intent = new Intent(startingActivity, TakePhotoActivity.class);
intent.putExtra(ARG_REVEAL_START_LOCATION, startingLocation);
startingActivity.startActivity(intent);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_take_photo);
updateStatusBarColor();
updateState(STATE_TAKE_PHOTO);
setupRevealBackground(savedInstanceState);
setupPhotoFilters();
radius = InstaMaterialApplication.getSearchDistance();
lastRadius = radius;
// Create a new global location parameters object
locationRequest = LocationRequest.create();
// Set the update interval
locationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
// Use high accuracy
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
// Set the interval ceiling to one minute
locationRequest.setFastestInterval(FAST_INTERVAL_CEILING_IN_MILLISECONDS);
// Create a new location client, using the enclosing class to handle callbacks.
locationClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
vUpperPanel.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
vUpperPanel.getViewTreeObserver().removeOnPreDrawListener(this);
pendingIntro = true;
vUpperPanel.setTranslationY(-vUpperPanel.getHeight());
vLowerPanel.setTranslationY(vLowerPanel.getHeight());
return true;
}
});
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void updateStatusBarColor() {
if (Utils.isAndroid5()) {
getWindow().setStatusBarColor(0xff111111);
}
}
private void setupRevealBackground(Bundle savedInstanceState) {
vRevealBackground.setFillPaintColor(0xFF16181a);
vRevealBackground.setOnStateChangeListener(this);
if (savedInstanceState == null) {
final int[] startingLocation = getIntent().getIntArrayExtra(ARG_REVEAL_START_LOCATION);
vRevealBackground.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
vRevealBackground.getViewTreeObserver().removeOnPreDrawListener(this);
vRevealBackground.startFromLocation(startingLocation);
return true;
}
});
} else {
vRevealBackground.setToFinishedFrame();
}
}
FiltersQueryAdapter mainAdapter = new FiltersQueryAdapter(this, PhotoFiltersAdapter.class
, new ParseRecyclerQueryAdapter.QueryFactory() {
public ParseQuery create() {
Location myLoc = (currentLocation == null) ? lastLocation : currentLocation;
ParseQuery query = ParseQuery.getQuery("PlaceFilters");
//query.include("user");
query.orderByAscending("GeoArea");
query.whereWithinKilometers("GeoArea", geoPointFromLocation(myLoc), radius);
query.setLimit(6);
return query;
}
});
private void setupPhotoFilters() {
rvFilters.setHasFixedSize(true);
rvFilters.setAdapter(mainAdapter);
rvFilters.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
}
@Override
protected void onResume() {
super.onResume();
cameraView.onResume();
// Get the latest search distance preference
radius = InstaMaterialApplication.getSearchDistance();
// Checks the last saved location to show cached data if it's available
if (lastLocation != null) {
// If the search distance preference has been changed, move
// map to new bounds.
if (lastRadius != radius) {
// Save the current radius
lastRadius = radius;
doListQuery();
}
}
}
@Override
protected void onPause() {
super.onPause();
cameraView.onPause();
}
/*
* Called when the Activity is no longer visible at all. Stop updates and disconnect.
*/
@Override
public void onStop() {
// If the client is connected
if (locationClient.isConnected()) {
stopPeriodicUpdates();
}
// After disconnect() is called, the client is considered "dead".
locationClient.disconnect();
super.onStop();
}
/*
* Called when the Activity is restarted, even before it becomes visible.
*/
@Override
public void onStart() {
super.onStart();
// Connect to the location services client
locationClient.connect();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
// Choose what to do based on the request code
switch (requestCode) {
// If the request code matches the code sent in onConnectionFailed
case CONNECTION_FAILURE_RESOLUTION_REQUEST:
switch (resultCode) {
// If Google Play services resolved the problem
case Activity.RESULT_OK:
if (InstaMaterialApplication.APPDEBUG) {
// Log the result
Log.d(InstaMaterialApplication.APPTAG, "Connected to Google Play services");
}
break;
// If any other result was returned by Google Play services
default:
if (InstaMaterialApplication.APPDEBUG) {
// Log the result
Log.d(InstaMaterialApplication.APPTAG, "Could not connect to Google Play services");
}
break;
}
// If any other request code was received
default:
if (InstaMaterialApplication.APPDEBUG) {
// Report that this Activity received an unknown requestCode
Log.d(InstaMaterialApplication.APPTAG, "Unknown request code received for the activity");
}
break;
}
}
@OnClick(R.id.btnTakePhoto)
public void onTakePhotoClick() {
btnTakePhoto.setEnabled(false);
cameraView.takePicture(true, true);
animateShutter();
}
@OnClick(R.id.btnAccept)
public void onAcceptClick() {
PublishActivity.openWithPhotoUri(this, Uri.fromFile(photoPath));
}
/*
* Verify that Google Play services is available before making a request.
*
* @return true if Google Play services is available, otherwise false
*/
private boolean servicesConnected() {
// Check that Google Play services is available
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode) {
if (InstaMaterialApplication.APPDEBUG) {
// In debug mode, log the status
Log.d(InstaMaterialApplication.APPTAG, "Google play services available");
}
// Continue
return true;
// Google Play services was not available for some reason
} else {
// Display an error dialog
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(resultCode, this, 0);
if (dialog != null) {
ErrorDialogFragment errorFragment = new ErrorDialogFragment();
errorFragment.setDialog(dialog);
errorFragment.show(getSupportFragmentManager(), InstaMaterialApplication.APPTAG);
}
return false;
}
}
/*
* Called by Location Services when the request to connect the client finishes successfully. At
* this point, you can request the current location or start periodic updates
*/
public void onConnected(Bundle bundle) {
if (InstaMaterialApplication.APPDEBUG) {
Log.d("Location Connected", InstaMaterialApplication.APPTAG);
}
currentLocation = getLocation();
startPeriodicUpdates();
}
/*
* Called by Location Services if the connection to the location client drops because of an error.
*/
public void onDisconnected() {
if (InstaMaterialApplication.APPDEBUG) {
Log.d("Location Disconnected", InstaMaterialApplication.APPTAG);
}
}
@Override
public void onConnectionSuspended(int i) {
Log.i(InstaMaterialApplication.APPTAG, "GoogleApiClient connection has been suspend");
}
/*
* Called by Location Services if the attempt to Location Services fails.
*/
public void onConnectionFailed(ConnectionResult connectionResult) {
// Google Play services can resolve some errors it detects. If the error has a resolution, try
// sending an Intent to start a Google Play services activity that can resolve error.
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
} catch (IntentSender.SendIntentException e) {
if (InstaMaterialApplication.APPDEBUG) {
// Thrown if Google Play services canceled the original PendingIntent
Log.d(InstaMaterialApplication.APPTAG, "An error occurred when connecting to location services.", e);
}
}
} else {
// If no resolution is available, display a dialog to the user with the error.
showErrorDialog(connectionResult.getErrorCode());
}
}
/*
* Report location updates to the UI.
*/
public void onLocationChanged(Location location) {
currentLocation = location;
if (lastLocation != null
&& geoPointFromLocation(location)
.distanceInKilometersTo(geoPointFromLocation(lastLocation)) < 0.01) {
// If the location hasn't changed by more than 10 meters, ignore it.
return;
}
lastLocation = location;
// Update map radius indicator
doListQuery();
}
/*
* In response to a request to start updates, send a request to Location Services
*/
private void startPeriodicUpdates() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(
locationClient, locationRequest, this);
}
/*
* In response to a request to stop updates, send a request to Location Services
*/
private void stopPeriodicUpdates() {
locationClient.disconnect();
}
/*
* Get the current location
*/
private Location getLocation() {
// If Google Play Services is available
if (servicesConnected()) {
// Get the current location
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
}
return LocationServices.FusedLocationApi.getLastLocation(locationClient);
} else {
return null;
}
}
/*
* Set up a query to update the list view
*/
private void doListQuery() {
Location myLoc = (currentLocation == null) ? lastLocation : currentLocation;
// If location info is available, load the data
if (myLoc != null) {
// Refreshes the list view with new data based
// usually on updated location data.
// mainAdapter.;
}
}
/*
* Helper method to get the Parse GEO point representation of a location
*/
private ParseGeoPoint geoPointFromLocation(Location loc) {
return new ParseGeoPoint(loc.getLatitude(), loc.getLongitude());
}
/*
* Show a dialog returned by Google Play services for the connection error code
*/
private void showErrorDialog(int errorCode) {
// Get the error dialog from Google Play services
Dialog errorDialog =
GooglePlayServicesUtil.getErrorDialog(errorCode, this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
// If Google Play services can provide an error dialog
if (errorDialog != null) {
// Create a new DialogFragment in which to show the error dialog
ErrorDialogFragment errorFragment = new ErrorDialogFragment();
// Set the dialog in the DialogFragment
errorFragment.setDialog(errorDialog);
// Show the error dialog in the DialogFragment
errorFragment.show(getSupportFragmentManager(), InstaMaterialApplication.APPTAG);
}
}
/*
* Define a DialogFragment to display the error dialog generated in showErrorDialog.
*/
public static class ErrorDialogFragment extends DialogFragment {
// Global field to contain the error dialog
private Dialog mDialog;
/**
* Default constructor. Sets the dialog field to null
*/
public ErrorDialogFragment() {
super();
mDialog = null;
}
/*
* Set the dialog to display
*
* @param dialog An error dialog
*/
public void setDialog(Dialog dialog) {
mDialog = dialog;
}
/*
* This method must return a Dialog to the DialogFragment.
*/
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return mDialog;
}
}
private void animateShutter() {
vShutter.setVisibility(View.VISIBLE);
vShutter.setAlpha(0.f);
ObjectAnimator alphaInAnim = ObjectAnimator.ofFloat(vShutter, "alpha", 0f, 0.8f);
alphaInAnim.setDuration(100);
alphaInAnim.setStartDelay(100);
alphaInAnim.setInterpolator(ACCELERATE_INTERPOLATOR);
ObjectAnimator alphaOutAnim = ObjectAnimator.ofFloat(vShutter, "alpha", 0.8f, 0f);
alphaOutAnim.setDuration(200);
alphaOutAnim.setInterpolator(DECELERATE_INTERPOLATOR);
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.playSequentially(alphaInAnim, alphaOutAnim);
animatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
vShutter.setVisibility(View.GONE);
}
});
animatorSet.start();
}
@Override
public void onStateChange(int state) {
if (RevealBackgroundView.STATE_FINISHED == state) {
vTakePhotoRoot.setVisibility(View.VISIBLE);
if (pendingIntro) {
startIntroAnimation();
}
} else {
vTakePhotoRoot.setVisibility(View.INVISIBLE);
}
}
private void startIntroAnimation() {
vUpperPanel.animate().translationY(0).setDuration(400).setInterpolator(DECELERATE_INTERPOLATOR);
vLowerPanel.animate().translationY(0).setDuration(400).setInterpolator(DECELERATE_INTERPOLATOR).start();
}
@Override
public CameraHost getCameraHost() {
return new MyCameraHost(this);
}
class MyCameraHost extends SimpleCameraHost {
private Camera.Size previewSize;
public MyCameraHost(Context ctxt) {
super(ctxt);
}
@Override
public boolean useFullBleedPreview() {
return true;
}
@Override
public Camera.Size getPictureSize(PictureTransaction xact, Camera.Parameters parameters) {
return previewSize;
}
@Override
public Camera.Parameters adjustPreviewParameters(Camera.Parameters parameters) {
Camera.Parameters parameters1 = super.adjustPreviewParameters(parameters);
previewSize = parameters1.getPreviewSize();
return parameters1;
}
@Override
public void saveImage(PictureTransaction xact, final Bitmap bitmap) {
runOnUiThread(new Runnable() {
@Override
public void run() {
showTakenPicture(bitmap);
}
});
}
@Override
public void saveImage(PictureTransaction xact, byte[] image) {
super.saveImage(xact, image);
photoPath = getPhotoPath();
}
}
private void showTakenPicture(Bitmap bitmap) {
vUpperPanel.showNext();
vLowerPanel.showNext();
ivTakenPhoto.setImageBitmap(bitmap);
updateState(STATE_SETUP_PHOTO);
}
@Override
public void onBackPressed() {
if (currentState == STATE_SETUP_PHOTO) {
btnTakePhoto.setEnabled(true);
vUpperPanel.showNext();
vLowerPanel.showNext();
updateState(STATE_TAKE_PHOTO);
} else {
super.onBackPressed();
}
}
private void updateState(int state) {
currentState = state;
if (currentState == STATE_TAKE_PHOTO) {
vUpperPanel.setInAnimation(this, R.anim.slide_in_from_right);
vLowerPanel.setInAnimation(this, R.anim.slide_in_from_right);
vUpperPanel.setOutAnimation(this, R.anim.slide_out_to_left);
vLowerPanel.setOutAnimation(this, R.anim.slide_out_to_left);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
ivTakenPhoto.setVisibility(View.GONE);
}
}, 400);
} else if (currentState == STATE_SETUP_PHOTO) {
vUpperPanel.setInAnimation(this, R.anim.slide_in_from_left);
vLowerPanel.setInAnimation(this, R.anim.slide_in_from_left);
vUpperPanel.setOutAnimation(this, R.anim.slide_out_to_right);
vLowerPanel.setOutAnimation(this, R.anim.slide_out_to_right);
ivTakenPhoto.setVisibility(View.VISIBLE);
}
}
}
这是我的Logcat：
02-16 17:32:40.700 22343-22343/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.google.peep, PID: 22343
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.google.peep/com.google.peep.activity.TakePhotoActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'double android.location.Location.getLatitude()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2484)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2544)
at android.app.ActivityThread.access$900(ActivityThread.java:150)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1394)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:168)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:687)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'double android.location.Location.getLatitude()' on a null object reference
at com.google.peep.activity.TakePhotoActivity.geoPointFromLocation(TakePhotoActivity.java:501)
at com.google.peep.activity.TakePhotoActivity.access$300(TakePhotoActivity.java:66)
at com.google.peep.activity.TakePhotoActivity$3.create(TakePhotoActivity.java:223)
at com.javon.parserecyclerviewadapter.ParseRecyclerQueryAdapter.loadParseData(ParseRecyclerQueryAdapter.java:96)
at com.javon.parserecyclerviewadapter.ParseRecyclerQueryAdapter.registerAdapterDataObserver(ParseRecyclerQueryAdapter.java:176)
at android.support.v7.widget.RecyclerView.setAdapterInternal(RecyclerView.java:886)
at android.support.v7.widget.RecyclerView.setAdapter(RecyclerView.java:847)
at com.google.peep.activity.TakePhotoActivity.setupPhotoFilters(TakePhotoActivity.java:232)
at com.google.peep.activity.TakePhotoActivity.onCreate(TakePhotoActivity.java:152)
答案 0 :(得分：2)
你的getlocation是在google api客户端实际连接之前，在onConnected中传递设置的photofilters并且它将运行.Tatasthu！