这是我的MainMapView.java
public class MainMapView extends FragmentActivity{
// Map and location
private GoogleMap googleMap;
private LocationManager locationManager;
private LatLng latLng;
private double latitude = 0;
private double longitude = 0;
private List<Address> addresses;
private List<Address> markerAddresses;
private Geocoder geocoder;
private Marker marker;
//Marker values
private TextView tvAddress;
private TextView tvPostalCode;
private TextView tvCity;
private TextView tvCountry;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_view);
tvAddress = (TextView)findViewById(R.id.infowindow_address);
tvPostalCode = (TextView)findViewById(R.id.infowindow_postalcode);
tvCity = (TextView)findViewById(R.id.infowindow_city);
tvCountry = (TextView)findViewById(R.id.infowindow_country);
//setup the map
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (googleMap == null) {
// Try to obtain the map from the SupportMapFragment.
googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
// Check if we were successful in obtaining the map.
if (googleMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
//Enable MyLocation layer of Google Map
googleMap.setMyLocationEnabled(true);
//Get LocationManager object from System Service LOCATION_SERVICE
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
//create a criteria object to retrieve provider
Criteria criteria = new Criteria();
//get the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
//get current location
Location myLocation = locationManager.getLastKnownLocation(provider);
if(myLocation != null){
latitude = myLocation.getLatitude();
longitude = myLocation.getLongitude();
}else{
myLocation=locationManager.getLastKnownLocation("GPS");
latitude = myLocation.getLatitude();
longitude = myLocation.getLongitude();
}
//set map type
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//create a latingobject for the current location
latLng =new LatLng(latitude, longitude);
//show the current location in google map
googleMap.setMyLocationEnabled(true);
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
//zoom in the google map
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
//Set InfoWindowAdapter
googleMap.setInfoWindowAdapter(new CustomInfoWindowAdapter());
//listen to long press on the map to make markers
googleMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
@Override
public void onMapLongClick(LatLng arg0) {
// when getting the long click clear all marker on the map and add the new one
googleMap.clear();
// make sure to save the new marker latitude and longitude
latitude = arg0.latitude;
longitude = arg0.longitude;
// show the address
geocoder = new Geocoder(MainMapView.this, Locale.getDefault());
try {
addresses = geocoder.getFromLocation(latitude, longitude, 1);
} catch (IOException e) {
e.printStackTrace();
}
// Adding marker on the GoogleMap
marker = googleMap.addMarker(new MarkerOptions().position(arg0));
// Showing InfoWindow on the GoogleMap
marker.showInfoWindow();
}
private class CustomInfoWindowAdapter implements InfoWindowAdapter{
@Override
public View getInfoWindow(Marker arg0) {
return null;
}
@Override
public View getInfoContents(Marker arg0) {
View v = getLayoutInflater().inflate(R.layout.map_infowindow_style, null);
// show the address
geocoder = new Geocoder(MainMapView.this, Locale.getDefault());
try {
markerAddresses = geocoder.getFromLocation(arg0.getPosition().latitude, arg0.getPosition().longitude, 1);
} catch (IOException e) {
e.getCause();
}
tvAddress.setText(arg0.getTitle());
tvPostalCode.setText(arg0.getSnippet());
tvCity.setText(arg0.getSnippet());
tvCountry.setText(arg0.getSnippet());
v.setLayoutParams(new ViewGroup.LayoutParams(v.getWidth(),v.getHeight()));
return v;
}
}
}
map_infowindow_style.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/infowindow_style_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/infowindow_address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/infowindow_postalcode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/infowindow_city"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/infowindow_country"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceMedium" />
<View
android:id="@+id/vertical_line"
android:layout_width="fill_parent"
android:layout_height="1dip"
android:background="@color/DarkGray" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="?android:attr/selectableItemBackground"
android:text="Add" />
</LinearLayout>
这是我得到的错误，我无法找到解决方案!!？
04-15 19:32:30.937: D/AndroidRuntime(13855): Shutting down VM
04-15 19:32:30.937: W/dalvikvm(13855): threadid=1: thread exiting with uncaught exception (group=0x419687c0)
04-15 19:32:30.947: E/AndroidRuntime(13855): FATAL EXCEPTION: main
04-15 19:32:30.947: E/AndroidRuntime(13855): java.lang.NullPointerException
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.nyanrex52.partylandv2.MainMapView$CustomInfoWindowAdapter.getInfoContents(MainMapView.java:314)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.google.android.gms.maps.GoogleMap$11.g(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.google.android.gms.maps.internal.d$a.onTransact(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at android.os.Binder.transact(Binder.java:347)
04-15 19:32:30.947: E/AndroidRuntime(13855): at etp.b(SourceFile:112)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.e.bm.a(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.e.bm.b(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.e.bn.g(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at ewp.onTransact(SourceFile:145)
04-15 19:32:30.947: E/AndroidRuntime(13855): at android.os.Binder.transact(Binder.java:347)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.google.android.gms.maps.model.internal.d$a$a.showInfoWindow(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.google.android.gms.maps.model.Marker.showInfoWindow(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.nyanrex52.partylandv2.MainMapView$2.onMapLongClick(MainMapView.java:198)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.google.android.gms.maps.GoogleMap$7.onMapLongClick(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.google.android.gms.maps.internal.j$a.onTransact(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at android.os.Binder.transact(Binder.java:347)
04-15 19:32:30.947: E/AndroidRuntime(13855): at euq.a(SourceFile:93)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.c.j.b(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.ay.an.c(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.ay.bc.onLongPress(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.bo.g.onLongPress(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.bo.h.c(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at maps.bo.i.handleMessage(Unknown Source)
04-15 19:32:30.947: E/AndroidRuntime(13855): at android.os.Handler.dispatchMessage(Handler.java:99)
04-15 19:32:30.947: E/AndroidRuntime(13855): at android.os.Looper.loop(Looper.java:137)
04-15 19:32:30.947: E/AndroidRuntime(13855): at android.app.ActivityThread.main(ActivityThread.java:5289)
04-15 19:32:30.947: E/AndroidRuntime(13855): at java.lang.reflect.Method.invokeNative(Native Method)
04-15 19:32:30.947: E/AndroidRuntime(13855): at java.lang.reflect.Method.invoke(Method.java:525)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
04-15 19:32:30.947: E/AndroidRuntime(13855): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
04-15 19:32:30.947: E/AndroidRuntime(13855): at dalvik.system.NativeStart.main(Native Method)
另外，我想知道是否有人有一个非常好的教程解释＆＃34; Custom Infowindow＆＃34;。我之所以问的是，到目前为止我所看到的所有教程都在这里，他们都使用getTitle和getSnippet在infowindow中描述了2行。我不明白如何用更多的线来做到这一点？
答案 0 :(得分：0)
我找到了解决方案。问题出在班级CustomInfoWindowAdapter
我所要做的就是在这个类的开头初始化View，这样两种方法都可以使用它。
我花了很长时间才看到它但是，我做到了:)
private class CustomInfoWindowAdapter implements InfoWindowAdapter{
View v = getLayoutInflater().inflate(R.layout.map_infowindow_style, null);
@Override
public View getInfoWindow(Marker arg0) {
return v;
}
@Override
public View getInfoContents(Marker arg0) {
tvAddress = (TextView)findViewById(R.id.infowindow_address);
tvPostalCode = (TextView)findViewById(R.id.infowindow_postalcode);
tvCity = (TextView)findViewById(R.id.infowindow_city);
tvCountry = (TextView)findViewById(R.id.infowindow_country);
// show the address
geocoder = new Geocoder(MainMapView.this, Locale.getDefault());
try {
markerAddresses = geocoder.getFromLocation(arg0.getPosition().latitude, arg0.getPosition().longitude, 1);
} catch (IOException e) {
e.getCause();
}
tvAddress.setText(arg0.getTitle());
tvPostalCode.setText(arg0.getSnippet());
tvCity.setText(arg0.getSnippet());
tvCountry.setText(arg0.getSnippet());
v.setLayoutParams(new ViewGroup.LayoutParams(v.getWidth(),v.getHeight()));
return v;
}
}