Flutter calls Baidu map app to realize location search and route planning

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1 The development of preparation

pubspec.yaml Add a plug-in to the configuration file

dependencies:
  flutter:
    sdk: flutter
  url_launcher: ^6.1.2

iOS To configure info.plist

<key>LSApplicationQueriesSchemes</key>
<array>
	<string>iosamap</string>
	<string>baidumap</string>
</array>

2 Flutter Tune up Baidu map - Search location

Baidu map development document

  ///  Baidu Maps 
  static Future<bool> openBaiduMap(
    double longitude,
    double latitude, {
    
    String? address,
    bool showErr = true,
    String? title,
  }) async {
    
    String url =
        "bdapp://map/geocoder?location=$latitude,$longitude&src=$title&coord_type=gcj02";
    if (Platform.isIOS) url = Uri.encodeFull(url);
    try {
    
      if (await canLaunchUrlString(url)) {
    
        await launchUrlString(url);
        return true;
      } else {
    
        if (showErr) showToastCommon(' Unable to adjust Baidu map ');
        return false;
      }
    } on Exception catch (e) {
    
      if (showErr) showToastCommon(' Unable to adjust Baidu map ');
      return false;
    }
  }

In fact, it is called Baidu map open api Reverse address resolution

The results are as follows ：

3 Coordinate type selection

It should be noted that coord_type Value of coordinate type

• bd09ll（ Baidu latitude and longitude coordinates ）
• bd09mc（ Baidu Mercator coordinates ）
• gcj02（ Coordinates encrypted by the National Survey Bureau )
• wgs84（gps The original coordinates obtained ）

If you do not pass the correct coordinate type parameter , It will cause the location coordinates to shift . The default is bd09 Latitude and longitude coordinates .

4 Flutter Tune up Baidu map - Navigation Route planning

Baidu map development document

 static Future<bool> openBaiduMapNav(
    double longitude,
    double latitude, {
    
    String? address,
    bool showErr = true,
    String? title,
  }) async {
    
    String url =
        'baidumap://map/direction?destination=name:${
    address ?? ''}|latlng:$latitude,$longitude&coord_type=bd09ll&mode=driving';
    if (Platform.isIOS) url = Uri.encodeFull(url);
    try {
    
      if (await canLaunchUrlString(url)) {
    
        await launchUrlString(url);
      }
    } on Exception catch (e) {
    
      if (showErr) showToastCommon(' Unable to adjust Baidu map ');
      return false;
    }
    return true;
  }

It's actually called