我想运行 Google Maps API V2 的示例代码。我遵循了这些步骤,但出现了问题。我在大多数活动中都遇到了编译器错误。
错误:LocationSourceDemoActivity.LongPressLocationSource 类型的方法 activate(LocationSource.OnLocationChangedListener) 必须覆盖超类方法
在以下代码中,这些方法出现错误:
public void activate(OnLocationChangedListener listener)
public void deactivate()
public void onMapLongClick(LatLng point)
代码:
package com.example.mapdemo;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.LocationSource;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import android.app.Activity;
import android.location.Location;
import android.os.Bundle;
/**
* This shows how to use a custom location source.
*/
public class LocationSourceDemoActivity extends android.support.v4.app.FragmentActivity {
/**
* A {@link LocationSource} which reports a new location whenever a user long presses the map at
* the point at which a user long pressed the map.
*/
private static class LongPressLocationSource implements LocationSource, OnMapLongClickListener {
private OnLocationChangedListener mListener;
/**
* Flag to keep track of the activity's lifecycle. This is not strictly necessary in this
* case because onMapLongPress events don't occur while the activity containing the map is
* paused but is included to demonstrate best practices (e.g., if a background service were
* to be used).
*/
private boolean mPaused;
@Override
public void activate(OnLocationChangedListener listener) {
mListener = listener;
}
@Override
public void deactivate() {
mListener = null;
}
@Override
public void onMapLongClick(LatLng point) {
if (mListener != null && !mPaused) {
Location location = new Location("LongPressLocationProvider");
location.setLatitude(point.latitude);
location.setLongitude(point.longitude);
location.setAccuracy(100);
mListener.onLocationChanged(location);
}
}
public void onPause() {
mPaused = true;
}
public void onResume() {
mPaused = false;
}
}
private LongPressLocationSource mLocationSource;
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.basic_demo);
mLocationSource = new LongPressLocationSource();
setUpMapIfNeeded();
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
mLocationSource.onResume();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
mMap.setLocationSource(mLocationSource);
mMap.setOnMapLongClickListener(mLocationSource);
mMap.setMyLocationEnabled(true);
}
@Override
protected void onPause() {
super.onPause();
mLocationSource.onPause();
}
}
我附上了图书馆,我没有跳过谷歌指南中的一步。我希望你们中的某个人可以帮助我!