如何从我的应用程序中打开标准的 Google Map 应用程序？

Question

一旦用户在我的应用程序中按下按钮，我想打开标准的谷歌地图应用程序并显示特定的位置。我该怎么做？ （不使用com.google.android.maps.MapView）

Answer 1

您应该使用地理 URI 创建一个 Intent 对象：

String uri = String.format(Locale.ENGLISH, "geo:%f,%f", latitude, longitude);
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
context.startActivity(intent);

如果要指定地址，则应使用另一种形式的地理 URI：geo:0,0?q=address。

参考：https://developer.android.com/guide/components/intents-common.html#Maps

Answer 2

您也可以简单地使用 http://maps.google.com/maps 作为您的 URI

String uri = "http://maps.google.com/maps?saddr=" + sourceLatitude + "," + sourceLongitude + "&daddr=" + destinationLatitude + "," + destinationLongitude;
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
startActivity(intent);

或者您可以确保仅使用 Google Maps 应用程序，这会阻止意图过滤器（对话框）出现，使用

intent.setPackage("com.google.android.apps.maps");

像这样：

String uri = "http://maps.google.com/maps?saddr=" + sourceLatitude + "," + sourceLongitude + "&daddr=" + destinationLatitude + "," + destinationLongitude;
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
intent.setPackage("com.google.android.apps.maps");
startActivity(intent);

或者您可以通过在每组坐标后的括号内添加一个字符串来为位置添加标签，如下所示：

String uri = "http://maps.google.com/maps?saddr=" + sourceLatitude + "," + sourceLongitude + "(" + "Home Sweet Home" + ")&daddr=" + destinationLatitude + "," + destinationLongitude + " (" + "Where the party is at" + ")";
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
intent.setPackage("com.google.android.apps.maps");
startActivity(intent);

要使用用户当前位置作为起点（不幸的是我还没有找到标记当前位置的方法）然后只需删除saddr 参数，如下所示：

String uri = "http://maps.google.com/maps?daddr=" + destinationLatitude + "," + destinationLongitude + " (" + "Where the party is at" + ")";
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
intent.setPackage("com.google.android.apps.maps");
startActivity(intent);

为了完整起见，如果用户没有安装地图应用程序，那么捕获 ActivityNotFoundException 将是一个好主意，正如@TonyQ 所述，然后我们可以在没有地图应用程序限制的情况下再次启动活动，我们可以可以肯定的是，我们将永远不会到达最后的 Toast，因为 Internet 浏览器也是启动此 url 方案的有效应用程序。

        String uri = "http://maps.google.com/maps?daddr=" + 12f + "," + 2f + " (" + "Where the party is at" + ")";
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
        intent.setPackage("com.google.android.apps.maps");
        try
        {
            startActivity(intent);
        }
        catch(ActivityNotFoundException ex)
        {
            try
            {
                Intent unrestrictedIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
                startActivity(unrestrictedIntent);
            }
            catch(ActivityNotFoundException innerEx)
            {
                Toast.makeText(this, "Please install a maps application", Toast.LENGTH_LONG).show();
            }
        }

编辑：

对于路线，现在 google.navigation 支持导航意图

Uri navigationIntentUri = Uri.parse("google.navigation:q=" + 12f + "," + 2f);
Intent mapIntent = new Intent(Intent.ACTION_VIEW, navigationIntentUri);
mapIntent.setPackage("com.google.android.apps.maps");
startActivity(mapIntent);

Answer 3

使用字符串格式会有所帮助，但您必须注意语言环境。在德国，浮点数将用逗号分隔，而不是一个点。

在语言环境中使用String.format("geo:%f,%f",5.1,2.1);，结果将是"geo:5.1,2.1"，但使用语言环境，您将得到"geo:5,1,2,1"

您应该使用英语语言环境来防止这种行为。

String uri = String.format(Locale.ENGLISH, "geo:%f,%f", latitude, longitude);
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
context.startActivity(intent);

要为地理点设置标签，您可以使用以下方法扩展地理 uri：

！！！ 但要小心，geo-uri 仍在开发中 https://datatracker.ietf.org/doc/html/draft-mayrhofer-geo-uri-00

String uri = String.format(Locale.ENGLISH, "geo:%f,%f?z=%d&q=%f,%f (%s)", 
                           latitude, longitude, zoom, latitude, longitude, label);
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
context.startActivity(intent);

Answer 4

从谷歌检查这个页面：

http://developer.android.com/guide/appendix/g-app-intents.html

您可以使用格式为 URI

geo:latitude,longitude

打开 Google 地图查看器并将其指向某个位置。

Answer 5

您也可以使用下面的代码 sn-p，以这种方式在启动意图之前检查谷歌地图的存在。

Uri gmmIntentUri = Uri.parse(String.format(Locale.ENGLISH,"geo:%f,%f", latitude, longitude));
Intent mapIntent = new Intent(Intent.ACTION_VIEW, gmmIntentUri);
mapIntent.setPackage("com.google.android.apps.maps");
if (mapIntent.resolveActivity(getPackageManager()) != null) {
    startActivity(mapIntent);
}

参考：https://developers.google.com/maps/documentation/android-api/intents

Answer 6

有时如果没有任何与 geo: protocal 相关的应用程序， 你可以使用 try-catch 来获取 ActivityNotFoundException 来处理它。

当你使用像androVM这样默认没有安装谷歌地图的模拟器时会发生这种情况。

Answer 7

要前往带有 PIN 码的位置，请使用：

String uri = "http://maps.google.com/maps?q=loc:" + destinationLatitude + "," + destinationLongitude;
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
intent.setPackage("com.google.android.apps.maps");
startActivity(intent);

如果没有 pin，请在 uri 中使用：

 String uri = "geo:" + destinationLatitude + "," + destinationLongitude;

Answer 8

这是用 Kotlin 编写的，如果找到它会打开地图应用并放置点并让您开始旅行：

  val gmmIntentUri = Uri.parse("http://maps.google.com/maps?daddr=" + adapter.getItemAt(position).latitud + "," + adapter.getItemAt(position).longitud)
        val mapIntent = Intent(Intent.ACTION_VIEW, gmmIntentUri)
        mapIntent.setPackage("com.google.android.apps.maps")
        if (mapIntent.resolveActivity(requireActivity().packageManager) != null) {
            startActivity(mapIntent)
        }

将requireActivity() 替换为您的Context。

Answer 9

我有一个示例应用程序，我在其中准备意图并将意图中的 CITY_NAME 传递给地图标记活动，该活动最终通过地理编码器使用 CITY_NAME 计算经度和纬度。

下面是启动地图标记活动的代码sn-p和完整的MapsMarkerActivity。

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    } else if (id == R.id.action_refresh) {
        Log.d(APP_TAG, "onOptionsItemSelected Refresh selected");
        new MainActivityFragment.FetchWeatherTask().execute(CITY, FORECAS_DAYS);
        return true;
    } else if (id == R.id.action_map) {
        Log.d(APP_TAG, "onOptionsItemSelected Map selected");
        Intent intent = new Intent(this, MapsMarkerActivity.class);
        intent.putExtra("CITY_NAME", CITY);
        startActivity(intent);
        return true;
    }

    return super.onOptionsItemSelected(item);
}

---

public class MapsMarkerActivity extends AppCompatActivity
        implements OnMapReadyCallback {

    private String cityName = "";

    private double longitude;

    private double latitude;

    static final int numberOptions = 10;

    String [] optionArray = new String[numberOptions];

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Retrieve the content view that renders the map.
        setContentView(R.layout.activity_map);
        // Get the SupportMapFragment and request notification
        // when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        // Test whether geocoder is present on platform
        if(Geocoder.isPresent()){
            cityName = getIntent().getStringExtra("CITY_NAME");
            geocodeLocation(cityName);
        } else {
            String noGoGeo = "FAILURE: No Geocoder on this platform.";
            Toast.makeText(this, noGoGeo, Toast.LENGTH_LONG).show();
            return;
        }
    }

    /**
     * Manipulates the map when it's available.
     * The API invokes this callback 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 receives a prompt to install
     * Play services inside the SupportMapFragment. The API invokes this method after the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {
        // Add a marker in Sydney, Australia,
        // and move the map's camera to the same location.
        LatLng sydney = new LatLng(latitude, longitude);
        // If cityName is not available then use
        // Default Location.
        String markerDisplay = "Default Location";
        if (cityName != null
                && cityName.length() > 0) {
            markerDisplay = "Marker in " + cityName;
        }
        googleMap.addMarker(new MarkerOptions().position(sydney)
                .title(markerDisplay));
        googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }

    /**
     * Method to geocode location passed as string (e.g., "Pentagon"), which
     * places the corresponding latitude and longitude in the variables lat and lon.
     *
     * @param placeName
     */
    private void geocodeLocation(String placeName){

        // Following adapted from Conder and Darcey, pp.321 ff.
        Geocoder gcoder = new Geocoder(this);

        // Note that the Geocoder uses synchronous network access, so in a serious application
        // it would be best to put it on a background thread to prevent blocking the main UI if network
        // access is slow. Here we are just giving an example of how to use it so, for simplicity, we
        // don't put it on a separate thread.  See the class RouteMapper in this package for an example
        // of making a network access on a background thread. Geocoding is implemented by a backend
        // that is not part of the core Android framework, so we use the static method
        // Geocoder.isPresent() to test for presence of the required backend on the given platform.

        try{
            List<Address> results = null;
            if(Geocoder.isPresent()){
                results = gcoder.getFromLocationName(placeName, numberOptions);
            } else {
                Log.i(MainActivity.APP_TAG, "No Geocoder found");
                return;
            }
            Iterator<Address> locations = results.iterator();
            String raw = "\nRaw String:\n";
            String country;
            int opCount = 0;
            while(locations.hasNext()){
                Address location = locations.next();
                if(opCount == 0 && location != null){
                    latitude = location.getLatitude();
                    longitude = location.getLongitude();
                }
                country = location.getCountryName();
                if(country == null) {
                    country = "";
                } else {
                    country =  ", " + country;
                }
                raw += location+"\n";
                optionArray[opCount] = location.getAddressLine(0)+", "
                        +location.getAddressLine(1)+country+"\n";
                opCount ++;
            }
            // Log the returned data
            Log.d(MainActivity.APP_TAG, raw);
            Log.d(MainActivity.APP_TAG, "\nOptions:\n");
            for(int i=0; i<opCount; i++){
                Log.i(MainActivity.APP_TAG, "("+(i+1)+") "+optionArray[i]);
            }
            Log.d(MainActivity.APP_TAG, "latitude=" + latitude + ";longitude=" + longitude);
        } catch (Exception e){
            Log.d(MainActivity.APP_TAG, "I/O Failure; do you have a network connection?",e);
        }
    }
}

链接过期，所以我在上面粘贴了完整的代码，但以防万一你想查看完整的代码，那么它可以在：https://github.com/gosaliajigar/CSC519/tree/master/CSC519_HW4_89753

Answer 10

另外，您可以使用 external_app_launcher：https://pub.dev/packages/external_app_launcher

要知道是否安装：

await LaunchApp.isAppInstalled(androidPackageName: 'com.google.android.maps.MapView', iosUrlScheme: 'comgooglemaps://');

打开：

await LaunchApp.openApp(
                    androidPackageName: 'com.google.android.maps.MapView',
                    iosUrlScheme: 'comgooglemaps://',
                  );

Answer 11

Uri gmmIntentUri = Uri.parse("google.streetview:cbll=46.414382,10.013988");


Intent mapIntent = new Intent(Intent.ACTION_VIEW, gmmIntentUri);

mapIntent.setPackage("com.google.android.apps.maps");


startActivity(mapIntent);