Question

我无法将Google地图相机移回初始位置。基本上，我在Actionbar上有一个主页按钮。如果用户在地图上滚动并点按“主页”按钮，我希望相机移回原来的位置。

我使用@Override public boolean onOptionsItemSelected(MenuItem item) { LatLng initialLoc= mMap.getCameraPosition().target; CameraUpdate update = CameraUpdateFactory.newLatLng(initialLoc); CameraUpdate zoom = CameraUpdateFactory.zoomTo(15); mMap.moveCamera(update); mMap.animateCamera(zoom); return true; }获取原始坐标，但相机不移动。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment
        xmlns:map="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/map"
        tools:context="org.test"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        map:cameraTargetLat="xxx.xxx"
        map:cameraTargetLng="xxx.xxx"
        map:cameraZoom="15"
        map:mapType="normal" />

</RelativeLayout>

map.xml：

function onOpen() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet();
  var entries = [{
    name: "Toggle Rows",
    functionName: "toggleRows"
  },{
    name: "Hide Rows",
    functionName: "hideRows"
  },{
    name: "Show Rows",
    functionName: "showRows"
  }];
  sheet.addMenu("Script", entries);
};

function toggleRows() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getActiveSheet();
  var maxRows = sheet.getMaxRows();

  var r = sheet.getRange(1, 1, maxRows+1);
  var values = r.getValues();
  var hideRanges = [];
  var showRanges = [];

  var toggleValue = null;
  var startRow = null;

  var tmp;
  var len = values.length;
  var i;
  for (i = 0; i < len; i++) {
    tmp = values[i][0];
    if (startRow === null && (tmp === '--' || tmp === '||')) {
      startRow = i + 1;
      toggleValue = tmp;
    } else if (startRow !== null && tmp !== toggleValue) {
      if (toggleValue === '--') {
        hideRanges.push([startRow, (i + 1) - startRow]);
      } else {
        showRanges.push([startRow, (i + 1) - startRow])
      }

      if (tmp === '--' || tmp === '||') {
        startRow = i + 1;
        toggleValue = tmp;
      } else {
        startRow = null;
      }
    }
  }

  var customRange = null;
  var range = null;

  i = hideRanges.length;
  while (i--) {
    customRange = hideRanges[i];
    range = sheet.getRange(customRange[0], 1, customRange[1]);
    range.setValue('||');
    sheet.hideRows(customRange[0], customRange[1]);
  }

  i = showRanges.length;
  while (i--) {
    customRange = showRanges[i];
    range = sheet.getRange(customRange[0], 1, customRange[1]);
    range.setValue('--');
    sheet.showRows(customRange[0], customRange[1]);
  }

};

function hideRows() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getActiveSheet();
  var maxRows = sheet.getMaxRows();

  var r = sheet.getRange(1, 1, maxRows+1);
  var values = r.getValues();
  var startRow = null;

  var tmp;
  var len = values.length;
  var i;
  for (i = 0; i < len; i++) {
    tmp = values[i][0];
    if (startRow === null && (tmp === '--' || tmp === '||')) {
      startRow = i + 1;
    } else if (startRow !== null && (tmp !== '--' && tmp !== '||')) {
      var numRows = (i + 1) - startRow;
      sheet.getRange(startRow, 1, numRows).setValue('||');
      sheet.hideRows(startRow, numRows);
      startRow = null;
    }
  }

};

function showRows() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getActiveSheet();
  var maxRows = sheet.getMaxRows();

  var r = sheet.getRange(1, 1, maxRows+1);
  var values = r.getValues();
  var startRow = null;

  var tmp;
  var len = values.length;
  var i;
  for (i = 0; i < len; i++) {
    tmp = values[i][0];
    if (startRow === null && (tmp === '--' || tmp === '||')) {
      startRow = i + 1;
    } else if (startRow !== null && (tmp !== '--' && tmp !== '||')) {
      var numRows = (i + 1) - startRow;
      sheet.getRange(startRow, 1, numRows).setValue('--');
      sheet.showRows(startRow, numRows);
      startRow = null;
    }
  }

};

我错过了什么？

Answer 1

每当用户选择该选项时，您正在使用

LatLng initialLoc= mMap.getCameraPosition().target;

获取所谓的初始位置，这是错误的！ mMap.getCameraPosition().target返回摄像头指向的位置。您应该根据其他代码将lat长期存储在活动的onCreate()或其他某个位置，然后在onOptionItemSelected()中使用相同的内容。

顺便说一句，您可以在单个语句中将zoom和lat long组合如下。

    LatLng coordinate = new LatLng(lat, lng); //Store these lat lng values somewhere. These should be constant.
    CameraUpdate location = CameraUpdateFactory.newLatLngZoom(
            coordinate, 15);
    mMap.animateCamera(location);

更新

我真的不知道是什么时候或者什么时候打电话给它。但是你可以使用相同的代码

LatLng initialLoc= mMap.getCameraPosition().target;

而是在onCreate()或onResume()中对此进行一次调用，然后将其存储在那里。然后下次在optionsItemSelected()中使用这些值。虽然，为什么不简单地将您在xml中定义的值存储在java代码中然后使用它？

Answer 2

     LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());  
     MarkerOptions markerOptions = new MarkerOptions(); 
     markerOptions.position(latLng); 
     markerOptions.title(totalAddress); //Here Total Address is address which you want to show on marker
     mMap.clear();


    markerOptions.icon(
    BitmapDescriptorFactory
   .defaultMarker(BitmapDescriptorFactory.HUE_AZURE)); 

     markerOptions.getPosition(); 
     mCurrLocationMarker = mMap.addMarker(markerOptions); 
     mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 
     mMap.animateCamera(CameraUpdateFactory.zoomTo(11));

Answer 3

LatLng coordinate = new LatLng(latitude, longitude);
                    MarkerOptions markerOptions = new MarkerOptions();
                    markerOptions.position(coordinate);
                    markerOptions.title(placeName); //Here Total Address is address which you want to show on marker
                    mGoogleMap.clear();
                    markerOptions.icon(
                            BitmapDescriptorFactory
                                    .defaultMarker(BitmapDescriptorFactory.HUE_BLUE));

                    markerOptions.getPosition();
                    mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
                    mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(coordinate));
                    mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));

如何在Google Maps v2 for Android中将相机设置为指定位置？

3 个答案: