按钮单击dialogFragment后如何在谷歌地图上添加标记？
Posted
技术标签:
【中文标题】按钮单击dialogFragment后如何在谷歌地图上添加标记？【英文标题】：How do you add a marker on google map after button click on dialogFragment? 【发布时间】：2020-07-19 05:01:42 【问题描述】：我正在尝试创建一个应用程序，允许用户在地图上发布标记，该标记是他们捕获的图片以及他们设置的标题。但是，在用户单击 dialogFragment 上的帖子后，在我的 android 设备上运行它不会显示标记，它只会在 sydney 上显示一个标记。我将不胜感激任何帮助理解为什么标记没有出现，以及我可以做些什么来修复这个错误。谢谢！
这是我为DialogFragment创建的onView以及用于抓图的activityforresult，这里mMap是MapActivity中定义的GoogleMap
public void onActivityResult(int requestCode, int resultCode, Intent data)
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE)
if (resultCode == Activity.RESULT_OK)
Bitmap bmp = (Bitmap) data.getExtras().get("data");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
// convert byte array to Bitmap
image = BitmapFactory.decodeByteArray(byteArray, 0,
byteArray.length);
postImg.setImageBitmap(image);
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState)
super.onViewCreated(view, savedInstanceState);
Button post = view.findViewById(R.id.btnDone);
final EditText popUpName = view.findViewById(R.id.popUpName);
String title = getArguments().getString("title", "Post Popup");
final ChipGroup tags = view.findViewById(R.id.chipGroup);
getDialog().setTitle(title);
postImg = view.findViewById(R.id.imageView2);
postImg.setClickable(true);
popUpName.requestFocus();
//popUpName.setOnEditorActionListener(this);
getDialog().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
getDialog().getWindow().setLayout(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
postImg.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent,
CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
);
post.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
final String popUpTitle = popUpName.getText().toString();
tags.setOnCheckedChangeListener(new ChipGroup.OnCheckedChangeListener()
@Override
public void onCheckedChanged(ChipGroup group, int checkedId)
Chip chip = group.findViewById(checkedId);
if (chip != null)
String chipTagSelected = chip.getText().toString();
double maxX = 39.333977;
double minX = 39.326170;
double minY = -76.624140;
double maxY = -76.618813;
DecimalFormat df = new DecimalFormat(".######");
double diffX = maxX - minX;
double randomValueX = minX + Math.random() * diffX;
double diffY = maxY - minY;
double randomValueY = minY + Math.random() * diffY;
Marker marker = MapsView.mMap.addMarker(new MarkerOptions()
.position(new LatLng(randomValueX, randomValueY))
.title(popUpTitle)
.icon(BitmapDescriptorFactory.fromBitmap(image)));
marker.setTag(0);
);
//
//popUpName.getText().toString()
dismiss();
);
这是我的 DialogFragment xml 文件
<?xml version="1.0" encoding="utf-8"?>
android:layout_
android:layout_>
<TextView
android:id="@+id/title"
android:layout_
android:layout_
android:layout_marginStart="124dp"
android:text="Add PopUp"
app:layout_constraintBottom_toTopOf="@+id/popUpName"
app:layout_constraintStart_toStartOf="parent" />
<EditText
android:id="@+id/popUpName"
android:layout_
android:layout_
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:hint="Popup Name"
android:inputType="textCapWords"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/title" />
<Button
android:id="@+id/btnDone"
android:layout_
android:layout_
android:layout_marginStart="16dp"
android:layout_marginTop="7dp"
android:layout_marginEnd="16dp"
android:text="Post"
android:backgroundTint="@color/lightBlue"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/chipGroup" />
<TextView
android:id="@+id/textView"
android:layout_
android:layout_
android:layout_marginTop="12dp"
android:layout_marginEnd="112dp"
android:text="Tags"
android:textAlignment="center"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/popUpName" />
<com.google.android.material.chip.ChipGroup
android:id="@+id/chipGroup"
android:layout_
android:layout_
android:layout_marginStart="16dp"
android:layout_marginTop="7dp"
android:layout_marginEnd="16dp"
app:chipSpacing="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
app:singleSelection="true"
>
<com.google.android.material.chip.Chip
android:id="@+id/Dog"
android:layout_
android:layout_
android:text="Dog"
app:chipEndPadding="12dp"
app:chipStartPadding="12dp"
android:checkable="true"
android:clickable="true"
android:focusable="true"
app:chipBackgroundColor="@color/bg_chip_state_list"/>
<com.google.android.material.chip.Chip
android:id="@+id/Squirrels"
android:layout_
android:layout_
android:text="Squirrels"
app:chipEndPadding="12dp"
app:chipStartPadding="12dp"
android:checkable="true"
android:clickable="true"
android:focusable="true"
app:chipBackgroundColor="@color/bg_chip_state_list"/>
<com.google.android.material.chip.Chip
android:id="@+id/Bird"
android:layout_
android:layout_
android:text="Bird"
app:chipEndPadding="12dp"
app:chipStartPadding="12dp"
android:checkable="true"
android:clickable="true"
android:focusable="true"
app:chipBackgroundColor="@color/bg_chip_state_list"/>
<com.google.android.material.chip.Chip
android:id="@+id/People"
android:layout_
android:layout_
android:text="People"
app:chipEndPadding="8dp"
app:chipStartPadding="8dp"
android:checkable="true"
android:clickable="true"
android:focusable="true"
app:chipBackgroundColor="@color/bg_chip_state_list"/>
<com.google.android.material.chip.Chip
android:id="@+id/Random"
android:layout_
android:layout_
android:text="Random"
app:chipEndPadding="8dp"
app:chipStartPadding="8dp"
android:checkable="true"
android:clickable="true"
android:focusable="true"
app:chipBackgroundColor="@color/bg_chip_state_list"/>
<com.google.android.material.chip.Chip
android:id="@+id/Animals"
android:layout_
android:layout_
android:text="Animals"
app:chipEndPadding="8dp"
app:chipStartPadding="8dp"
android:checkable="true"
android:clickable="true"
android:focusable="true"
app:chipBackgroundColor="@color/bg_chip_state_list"/>
</com.google.android.material.chip.ChipGroup>
<ImageView
android:id="@+id/imageView2"
android:layout_
android:layout_
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:background="@color/colorPrimary"
android:clickable="true"
android:focusable="true"
app:layout_constraintBottom_toTopOf="@+id/title"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
这是我的 MapActivity onCreate，onMapReady 只是 MapACtivity 的基本实现，标记设置在 sydney
public class MapsView extends FragmentActivity implements OnMapReadyCallback
public static GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps_view);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
FloatingActionButton fab = findViewById(R.id.add_post);
fab.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
//Snackbar.make(view, "Here's a Snackbar", Snackbar.LENGTH_LONG)
// .setAction("Action", null).show();
showPostDialog();
);
private void showPostDialog()
FragmentManager fm = getSupportFragmentManager();
PostActivity postFragmentDialog = PostActivity.newInstance("Some title");
postFragmentDialog.show(fm, "fragment_edit");
//inal EditText popUpName = findViewById(R.id.popUpName);
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap)
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
【问题讨论】：
【参考方案1】：您可以从 dilaog 添加以下代码 onClick ，它将在谷歌地图上添加标记。在此之前只需检查 mapReady() 是否成功调用。
mGoogleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener()
@Override
public void onMapClick(LatLng destination)
MarkerOptions options = new MarkerOptions();
options.position(destination);
options.title("Lat=" + destination.latitude + ", Long=" + destination.longitude);
Marker marker = mGoogleMap.addMarker(options);
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(17));
);
【讨论】：
mGoogleMap 是以前定义的 mMap 吗？我添加了这些更改，但不幸的是，单击发布后标记仍然没有出现在地图上。如果对话不包含地图，我也很困惑为什么 onMapClick 会出现在对话中。以上是关于按钮单击dialogFragment后如何在谷歌地图上添加标记？的主要内容，如果未能解决你的问题，请参考以下文章
如何在 Flutter Web 中使用谷歌地图库？ [关闭]
在谷歌地图 V2 android studio 中单击 InfoWindowClick 时，如何设置唯一键？