如何从我的应用程序打开标准的谷歌地图应用程序？

在谷歌上查看这个页面:

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

可以使用表单的 URI

geo:latitude,longitude

打开谷歌地图查看器并指向一个位置。

您应该使用 geo-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，应该使用另一种形式的 geo-URI: geo:0,0?q=address。

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

使用 String 格式会有所帮助，但是您必须充分注意语言环境。在德国，float 将用逗号代替一个点来分隔。

使用本地英语的 String.format("geo:%f,%f",5.1,2.1);的结果将是 "geo:5.1,2.1"，但与本地德语你将得到 "geo:5,1,2,1"

您应该使用英语区域设置来防止这种行为。

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

要将一个标签设置为 geo 点，可以使用以下方法扩展 geo uri:

但是要小心，geo-uri 还在开发中 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);

有时候如果没有任何与地理协议相关的应用程序, 您可以使用 try-catch 获取 ActivityNotFoundException 来处理它。

当你使用像 androVM 这样的模拟器时会发生这种情况，因为它默认没有安装谷歌地图。

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);

或者你可以确保谷歌地图应用程序只被使用，这将阻止意图过滤器(对话框)出现，通过使用

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);

或者可以通过在每组坐标后面的圆括号内添加一个字符串来向位置添加标签，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) ，那么只需按照以下步骤删除 saddr参数:

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，那么捕捉 ActivityNotFoundException 将是一个好主意，如@TonyQ 所说，然后我们可以重新启动活动而不受地图应用程序的限制，我们可以非常确定我们永远不会到达 Toast 最后，因为互联网浏览器也是一个启动这个 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:

对于方向，现在 google.導航支持导航意图

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);

您也可以使用下面的代码片段，用这种方式，谷歌地图的存在是在意图开始之前检查。

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);
}

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

我有一个示例应用程序，我在其中准备意图，只是传递意图中的 CITY _ NAME 到地图标记活动，最终通过 Geocoder 使用 CITY _ NAME 计算经纬度。

下面是启动映射标记活动和完整的 MapsMarkerActivity 的代码片段。

@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，所以我已经粘贴完整的代码以上，但只是以防万一，如果你想看到完整的代码，然后它可在: https://github.com/gosaliajigar/CSC519/tree/master/CSC519_HW4_89753

要访问上面有 PIN 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);

如果没有引脚，请在 uri 中使用:

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

这是在 Kotlin 写的，如果找到了地图应用程序，它会打开地图应用程序，把地点放在这里，然后你就可以开始旅行了:

  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)
}

用 Context代替 requireActivity()。

此外，还可以使用 foreign _ app _ launcher: https://pub.dev/packages/external_app_launcher

了解是否已安装:

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

打开:

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

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);