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Today, I accidentally saw a technical master using Baidu Map for location and destination navigation Demo. It's very good, so I转载过来 share together, let's see the implementation effect below:
After entering, you will first get the current location, which will be displayed on the map. After entering the destination in the input box, the optimal route will appear on the map. Here, I have set it to the driving route with the shortest distance. There are also bus routes and walking routes, with detailed comments in the code. In addition, information about each node on the route, as well as the distance from the starting point and destination, is output in the console. The information displayed is the navigation information at the current node. As shown in the following figure:
Next, let's see how to implement it. First, register a Baidu developer account and enter the Baidu Map API to view relevant materials such as Baidu Map API. Then, register an APP KEY for the application that needs to be added to the map. After registration, download the Baidu Map jar file, create a new project, and import it. Below is the specific code implementation, with detailed comments in the code:
public class NavigationDemoActivity extends MapActivity {
private String mMapKey = "register your own key";
private EditText destinationEditText = null;
private Button startNaviButton = null;
private MapView mapView = null;
private BMapManager mMapManager = null;
private MyLocationOverlay myLocationOverlay = null;
//Register this listener when onResume, and remove it when onPause, note that this listener is not Android's built-in, it is from Baidu API
private LocationListener locationListener;
private MKSearch searchModel;
GeoPoint pt;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
destinationEditText = (EditText) this.findViewById(R.id.et_destination);
startNaviButton = (Button) this.findViewById(R.id.btn_navi);
mMapManager = new BMapManager(getApplication());
mMapManager.init(mMapKey, new MyGeneralListener());
super.initMapActivity(mMapManager);
mapView = (MapView) this.findViewById(R.id.bmapsView);
//Enable built-in zoom controls
mapView.setBuiltInZoomControls(true);
//Set overlay display during zoom animation, default is not to draw
// mapView.setDrawOverlayWhenZooming(true);
//Get the current location layer
myLocationOverlay = new MyLocationOverlay(this, mapView);
//Add the layer of the current location to the bottom layer of the map
mapView.getOverlays().add(myLocationOverlay);
// Register location event
locationListener = new LocationListener(){
@Override
public void onLocationChanged(Location location) {
if (location != null){
//Generate GEO type coordinates and locate the location marked by the coordinate on the map
pt = new GeoPoint((int)(location.getLatitude()*1e6),
(int)(location.getLongitude()*1e6))();
// System.out.println("---"+location.getLatitude() +: "+location.getLongitude());
mapView.getController().animateTo(pt);
}
}
};
//Initialize the search module
searchModel = new MKSearch();
//Set the route strategy to the shortest distance
searchModel.setDrivingPolicy(MKSearch.ECAR_DIS_FIRST);
searchModel.init(mMapManager, new MKSearchListener() {
//Callback method for getting driving route
@Override
public void onGetDrivingRouteResult(MKDrivingRouteResult res, int error) {
// Error codes can be referred to the definitions in MKEvent.
if (error != 0 || res == null) {
Toast.makeText(NavigationDemoActivity.this, "Sorry, no results found", Toast.LENGTH_SHORT).show();
return;
}
RouteOverlay routeOverlay = new RouteOverlay(NavigationDemoActivity.this, mapView);
// This only displays one plan as an example
MKRoute route = res.getPlan(0).getRoute(0);
int distanceM = route.getDistance();
String distanceKm = String.valueOf(distanceM / 1000) +.+String.valueOf(distanceM % 1000);
System.out.println("Distance: "+distanceKm+kilometers---Number of nodes: "+route.getNumSteps());
for (int i = 0; i < route.getNumSteps(); i++) {
MKStep step = route.getStep(i);
System.out.println("Node information: "+step.getContent());
}
routeOverlay.setData(route);
mapView.getOverlays().clear();
mapView.getOverlays().add(routeOverlay);
mapView.invalidate();
mapView.getController().animateTo(res.getStart().pt);
}
//The following two methods are the same as the driving plan implementation above
@Override
public void onGetWalkingRouteResult(MKWalkingRouteResult res, int error) {
//Obtain walking route
}
@Override
public void onGetTransitRouteResult(MKTransitRouteResult arg0, int arg1) {
//Obtain bus route information
}
@Override
public void onGetBusDetailResult(MKBusLineResult arg0, int arg1) {
}
@Override
public void onGetAddrResult(MKAddrInfo arg0, int arg1) {
}
@Override
public void onGetSuggestionResult(MKSuggestionResult arg0, int arg1) {
}
@Override
public void onGetPoiResult(MKPoiResult arg0, int arg1, int arg2) {
}
});
startNaviButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String destination = destinationEditText.getText().toString();
//Set starting point (current location)
MKPlanNode startNode = new MKPlanNode();
startNode.pt = pt;
//Set destination
MKPlanNode endNode = new MKPlanNode();
endNode.name = destination;
//Expand search city
String city = getResources().getString(R.string.beijing);
// System.out.println("----"+city+"---"+destination+"---"+pt);
searchModel.drivingSearch(city, startNode, city, endNode);
//Walking route
// searchModel.walkingSearch(city, startNode, city, endNode);
//Bus route
// searchModel.transitSearch(city, startNode, endNode);
}
});
}
@Override
protected void onResume() {
mMapManager.getLocationManager().requestLocationUpdates(locationListener);
myLocationOverlay.enableMyLocation();
myLocationOverlay.enableCompass(); // Turn on the compass
mMapManager.start();
super.onResume();
}
@Override
protected void onPause() {
mMapManager.getLocationManager().removeUpdates(locationListener);
myLocationOverlay.disableMyLocation();//Display the current location
myLocationOverlay.disableCompass(); // Close the compass
mMapManager.stop();
super.onPause();
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
// Common event listener, used to handle common network errors, authorization verification errors, etc.
class MyGeneralListener implements MKGeneralListener {
@Override
public void onGetNetworkState(int iError) {
Log.d("MyGeneralListener", "onGetNetworkState error is ")+ iError);
Toast.makeText(NavigationDemoActivity.this, "Your network is down!",
Toast.LENGTH_LONG).show();
}
@Override
public void onGetPermissionState(int iError) {
Log.d("MyGeneralListener", "onGetPermissionState error is ")+ iError);
if (iError == MKEvent.ERROR_PERMISSION_DENIED) {
// Authorization Key error：
Toast.makeText(NavigationDemoActivity.this,
"Please enter the correct authorization Key in the BMapApiDemoApp.java file!",
Toast.LENGTH_LONG).show();
}
}
}
}
Then is the layout file：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:text="Destination：" />
<EditText
android:id="@"+id/et_destination"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<Button
android:id="@"+id/btn_navi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Start navigate"/>
<com.baidu.mapapi.MapView
android:id="@"+id/bmapsView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true" />
</LinearLayout>
AndroidMainifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ericssonlabs"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
<supports-screens android:largeScreens="true"
android:normalScreens="true" android:smallScreens="true"
android:resizeable="true" android:anyDensity="true"/>
<uses-sdk android:minSdkVersion="3></uses-sdk>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".NavigationDemoActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN"> />
<category android:name="android.intent.category.LAUNCHER"> />
</intent-filter>
</activity>
</application>
</manifest>
That's all the code for implementing Baidu Map positioning and navigation to the destination. I don't know if that's what you want?
That's all for the content of this article. I hope it will be helpful to everyone's learning and that everyone will support the Yelling Tutorial more.
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