1
我正在使用Google Maps v2創建應用程序。每次我拍攝或選擇一張圖片，我創建一個自定義標記，並將其添加到地圖是這樣的：OnMarkerDragStart正在更改標記的原始位置
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE_INTENT) {
Bitmap photo = createBitmap(data);
Marker m = map.addMarker(photoMarker(lastKnownLatLng, photo));
markersInMap.add(m);
Log.d(TAG, "Marker created with " + m.getPosition().toString());
}
}
}
然後，如果我要刪除標記，我將其拖動到垃圾桶圖標。如果標記接觸到垃圾桶圖標，它將從地圖上移除;這工作正常。如果標記不接觸垃圾桶，它應該返回到原來的位置，但是失敗。當我開始拖動標記時，它看起來像位置發生變化，並且它在地圖上略微上升。
@Override
public void onMarkerDragStart(Marker marker) {
trashImageView.setVisibility(View.VISIBLE);
draggedMarkerOriginalPosition = marker.getPosition();
Log.d(TAG, "OnMarkerDragStart with " + draggedMarkerOriginalPosition.toString());
}
這兩種方法傾倒在logcat中的NEX信息，所以很明顯的標記位置，當我開始拖移的變化，但我不知道爲什麼，真正需要防止這種情況的發生：
Marker created with lat/lng: (19.3457139,-99.1522399)
OnMarkerDragStart with lat/lng: (19.35094919370183,-99.15169514715672)
這是我整個活動代碼：
public class MapsActivity extends FragmentActivity implements
OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
com.google.android.gms.location.LocationListener,
GoogleMap.OnMarkerDragListener {
private static final String TAG = "MAP_ACTIVITY";
private static final int SELECT_PICTURE_INTENT = 1;
private GoogleMap map;
private Polyline gpsTrack;
private SupportMapFragment mapFragment;
private GoogleApiClient googleApiClient;
private Uri imageUri;
private LatLng lastKnownLatLng;
private List<Marker> markersInMap = new ArrayList<>();
private ImageView trashImageView;
private LatLng draggedMarkerOriginalPosition;
private enum MapStatus {
EXPANDED, NORMAL, MINIMIZED
}
private MapStatus mapStatus = MapStatus.NORMAL;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
moveMapLocationButton();
ImageButton down = (ImageButton) findViewById(R.id.down_arrow);
down.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
animateDownMapView();
}
});
ImageButton up = (ImageButton) findViewById(R.id.up_arrow);
up.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
animateUpMapView();
}
});
ImageView camara = (ImageView) findViewById(R.id.camara);
camara.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startImageChoosingIntent();
}
});
Button finalizar = (Button) findViewById(R.id.btn_finalizar_recorrido);
finalizar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
gpsTrack.setPoints(new ArrayList<LatLng>());
for(Marker m : markersInMap) m.remove();
markersInMap.clear();
}
});
if (googleApiClient == null) {
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
trashImageView = (ImageView) findViewById(R.id.trash);
}
@Override
public void onMapReady(GoogleMap googleMap) {
map = googleMap;
map.addTileOverlay(new TileOverlayOptions().tileProvider(new CustomMapTileProvider(getResources().getAssets())));
LatLng calymayor = new LatLng(19.345822, -99.152274);
map.moveCamera(CameraUpdateFactory.newLatLng(calymayor));
map.moveCamera(CameraUpdateFactory.newLatLngZoom(calymayor, 15));
PolylineOptions polylineOptions = new PolylineOptions();
polylineOptions.color(Color.CYAN);
polylineOptions.width(4);
gpsTrack = map.addPolyline(polylineOptions);
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;
}
map.setMyLocationEnabled(true);
map.setOnMarkerDragListener(this);
}
private void moveMapLocationButton() {
View locationButton = ((View) mapFragment.getView().findViewById(Integer.parseInt("1")).getParent()).findViewById(Integer.parseInt("2"));
RelativeLayout.LayoutParams rlp = (RelativeLayout.LayoutParams) locationButton.getLayoutParams();
rlp.addRule(RelativeLayout.ALIGN_PARENT_TOP, 0);
rlp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);
rlp.setMargins(0, 0, 30, 30);
}
private void animateDownMapView() {
ResizeAnimation a = new ResizeAnimation(mapFragment.getView());
a.setDuration(250);
if (mapStatus == MapStatus.NORMAL) {
mapStatus = MapStatus.EXPANDED;
a.setParams(mapFragment.getView().getLayoutParams().height, dpToPx(getResources(), pxToDp(getResources().getDisplayMetrics().heightPixels)));
mapFragment.getView().startAnimation(a);
} else if (mapStatus == MapStatus.MINIMIZED) {
mapStatus = MapStatus.NORMAL;
mapFragment.getView().setLayoutParams(
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
0,
0.3333f
)
);
}
}
private void animateUpMapView() {
if (mapStatus == MapStatus.NORMAL) {
mapStatus = MapStatus.MINIMIZED;
mapFragment.getView().setLayoutParams(
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
0,
0.04f
)
);
} else if (mapStatus == MapStatus.EXPANDED) {
mapStatus = MapStatus.NORMAL;
mapFragment.getView().setLayoutParams(
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
0,
0.3333f
)
);
}
}
private int pxToDp(int px) {
DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
int dp = Math.round(px/(displayMetrics.xdpi/DisplayMetrics.DENSITY_DEFAULT));
return dp;
}
private int dpToPx(Resources res, int dp) {
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, res.getDisplayMetrics());
}
@Override
protected void onStart() {
googleApiClient.connect();
super.onStart();
}
@Override
protected void onStop() {
googleApiClient.disconnect();
super.onStop();
}
@Override
protected void onPause() {
super.onPause();
stopLocationUpdates();
}
@Override
public void onResume() {
super.onResume();
if (googleApiClient.isConnected()) {
startLocationUpdates();
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
startLocationUpdates();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
lastKnownLatLng = new LatLng(location.getLatitude(), location.getLongitude());
updateTrack();
}
protected void startLocationUpdates() {
LocationRequest locationRequest = new LocationRequest();
locationRequest.setInterval(5000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
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(googleApiClient, locationRequest, this);
}
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
googleApiClient, this);
}
private void startImageChoosingIntent() {
Intent pickIntent = new Intent();
pickIntent.setType("image/*");
pickIntent.setAction(Intent.ACTION_GET_CONTENT);
Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
String pickTitle = "Seleccionar";
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, "New Picture");
values.put(MediaStore.Images.Media.DESCRIPTION, "From your Camera");
imageUri = getContentResolver().insert(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
takePhotoIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
Intent chooserIntent = Intent.createChooser(pickIntent, pickTitle);
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[]{takePhotoIntent});
startActivityForResult(chooserIntent, SELECT_PICTURE_INTENT);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE_INTENT) {
Bitmap photo = createBitmap(data);
Marker m = map.addMarker(photoMarker(lastKnownLatLng, photo));
markersInMap.add(m);
Log.d(TAG, "Marker created with " + m.getPosition().toString());
}
}
}
private Bitmap createBitmap(Intent data) {
boolean isCamera;
Bitmap photoTaken = null;
if(data == null) {
isCamera = true;
} else {
String action = data.getAction();
if(action == null) {
isCamera = false;
} else {
isCamera = action.equals(MediaStore.ACTION_IMAGE_CAPTURE);
}
}
if(!isCamera) {
imageUri = data.getData();
}
try {
photoTaken = MediaStore.Images.Media.getBitmap(getContentResolver(), imageUri);
} catch (IOException e) {
e.printStackTrace();
}
return photoTaken;
}
private MarkerOptions photoMarker(LatLng latlng, Bitmap bitmap) {
return new MarkerOptions()
.position(latlng)
.draggable(true)
.icon(BitmapDescriptorFactory.fromBitmap(Utils.getMarkerBitmap(getBaseContext(), bitmap)));
}
private void updateTrack() {
List<LatLng> points = gpsTrack.getPoints();
points.add(lastKnownLatLng);
gpsTrack.setPoints(points);
}
@Override
public void onMarkerDragStart(Marker marker) {
trashImageView.setVisibility(View.VISIBLE);
draggedMarkerOriginalPosition = marker.getPosition();
Log.d(TAG, "OnMarkerDragStart with " + draggedMarkerOriginalPosition.toString());
}
@Override
public void onMarkerDrag(Marker marker) {
Point markerScreenPosition = map.getProjection().toScreenLocation(marker.getPosition());
int size = 0;
if (overlap(markerScreenPosition, trashImageView)) {
size = dpToPx(getResources(), 60);
} else {
size = dpToPx(getResources(), 40);
}
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(size, size);
params.gravity = Gravity.BOTTOM | Gravity.RIGHT;
trashImageView.setLayoutParams(params);
}
@Override
public void onMarkerDragEnd(Marker marker) {
trashImageView.setVisibility(View.GONE);
Point markerScreenPosition = map.getProjection().toScreenLocation(marker.getPosition());
if (overlap(markerScreenPosition, trashImageView)) {
marker.remove();
} else {
marker.setPosition(draggedMarkerOriginalPosition);
Log.d(TAG, "OnMarkerDragEnd with " + draggedMarkerOriginalPosition.toString());
}
}
private boolean overlap(Point point, ImageView imgview) {
int[] imgCoords = new int[2];
imgview.getLocationOnScreen(imgCoords);
boolean overlapX = point.x < imgCoords[0] + imgview.getWidth() && point.x > imgCoords[0] - imgview.getWidth();
boolean overlapY = point.y < imgCoords[1] + imgview.getHeight() && point.y > imgCoords[1] - imgview.getWidth();
return overlapX && overlapY;
}
}
而且這些圖像顯示在標記開始和在哪裏結束後，我拖，隨時隨地釋放標記的外TRA sh可以。
此變通辦法是我找到的唯一解決方案，用於解決同一問題。您能否將您的答案標記爲已接受，這樣可以幫助其他人？ – antonio