Java 构造函数位置客户端(MainActivity、MainActivity、MainActivity)未定义
因此,我将跟随Lynda.com关于使用Google Maps V2构建移动应用程序的教程,我将跟随一个部分,让您创建一个地图应用程序,通过编程查找位置,而不是依赖Java 构造函数位置客户端(MainActivity、MainActivity、MainActivity)未定义,java,android,google-maps,google-maps-api-2,Java,Android,Google Maps,Google Maps Api 2,因此,我将跟随Lynda.com关于使用Google Maps V2构建移动应用程序的教程,我将跟随一个部分,让您创建一个地图应用程序,通过编程查找位置,而不是依赖setMyLocationEnabled(true)方法。因此,我一直遵循代码,每次运行应用程序时,它都会崩溃,并在logcat中显示以下错误: 05-15 12:18:35.139: E/AndroidRuntime(22270): FATAL EXCEPTION: main 05-15 12:18:35.139: E/Androi
setMyLocationEnabled(true)
方法。因此,我一直遵循代码,每次运行应用程序时,它都会崩溃,并在logcat中显示以下错误:
05-15 12:18:35.139: E/AndroidRuntime(22270): FATAL EXCEPTION: main
05-15 12:18:35.139: E/AndroidRuntime(22270): Process: com.example.gmapsapp, PID: 22270
05-15 12:18:35.139: E/AndroidRuntime(22270): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.gmapsapp/com.example.gmapsapp.MainActivity}: java.lang.ClassCastException: com.example.gmapsapp.MainActivity cannot be cast to com.google.android.gms.common.GooglePlayServicesClient$ConnectionCallbacks
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.app.ActivityThread.access$900(ActivityThread.java:161)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.os.Handler.dispatchMessage(Handler.java:102)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.os.Looper.loop(Looper.java:157)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.app.ActivityThread.main(ActivityThread.java:5356)
05-15 12:18:35.139: E/AndroidRuntime(22270): at java.lang.reflect.Method.invokeNative(Native Method)
05-15 12:18:35.139: E/AndroidRuntime(22270): at java.lang.reflect.Method.invoke(Method.java:515)
05-15 12:18:35.139: E/AndroidRuntime(22270): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
05-15 12:18:35.139: E/AndroidRuntime(22270): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
05-15 12:18:35.139: E/AndroidRuntime(22270): at dalvik.system.NativeStart.main(Native Method)
05-15 12:18:35.139: E/AndroidRuntime(22270): Caused by: java.lang.ClassCastException: com.example.gmapsapp.MainActivity cannot be cast to com.google.android.gms.common.GooglePlayServicesClient$ConnectionCallbacks
05-15 12:18:35.139: E/AndroidRuntime(22270): at com.example.gmapsapp.MainActivity.onCreate(MainActivity.java:60)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.app.Activity.performCreate(Activity.java:5426)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
05-15 12:18:35.139: E/AndroidRuntime(22270): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
05-15 12:18:35.139: E/AndroidRuntime(22270): ... 11 more
以下是my MainActivity.java中的代码,如果您需要任何其他文件,请告诉我您是否可以帮助解决此问题,谢谢:
package com.example.gmapsapp;
import java.io.IOException;
import java.util.List;
import android.app.Dialog;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
public class MainActivity extends FragmentActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{
private static final int GPS_ERRORDIALOG_REQUEST = 9001;
@SuppressWarnings("unused")
private static final int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9002;
GoogleMap mMap;
@SuppressWarnings("unused")
private static final double SEATTLE_LAT = 47.60621,
SEATTLE_LNG =-122.33207,
SYDNEY_LAT = -33.867487,
SYDNEY_LNG = 151.20699,
NEWYORK_LAT = 40.714353,
NEWYORK_LNG = -74.005973;
private static final float DEFAULTZOOM = 15;
@SuppressWarnings("unused")
private static final String LOGTAG = "Maps";
LocationClient mLocationClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (servicesOK()) {
setContentView(R.layout.activity_map);
if (initMap()) {
// mMap.setMyLocationEnabled(true);
mLocationClient = new LocationClient(this, (ConnectionCallbacks) this, this);
mLocationClient.connect();
}
else {
Toast.makeText(this, "Map not available!", Toast.LENGTH_SHORT).show();
}
}
else {
setContentView(R.layout.activity_main);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public boolean servicesOK() {
int isAvailable = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (isAvailable == ConnectionResult.SUCCESS) {
return true;
}
else if (GooglePlayServicesUtil.isUserRecoverableError(isAvailable)) {
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(isAvailable, this, GPS_ERRORDIALOG_REQUEST);
dialog.show();
}
else {
Toast.makeText(this, "Can't connect to Google Play services", Toast.LENGTH_SHORT).show();
}
return false;
}
private boolean initMap() {
if (mMap == null) {
SupportMapFragment mapFrag =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mMap = mapFrag.getMap();
}
return (mMap != null);
}
@SuppressWarnings("unused")
private void gotoLocation(double lat, double lng) {
LatLng ll = new LatLng(lat, lng);
CameraUpdate update = CameraUpdateFactory.newLatLng(ll);
mMap.moveCamera(update);
}
private void gotoLocation(double lat, double lng,
float zoom) {
LatLng ll = new LatLng(lat, lng);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, zoom);
mMap.moveCamera(update);
}
public void geoLocate(View v) throws IOException {
hideSoftKeyboard(v);
EditText et = (EditText) findViewById(R.id.editText1);
String location = et.getText().toString();
Geocoder gc = new Geocoder(this);
List<Address> list = gc.getFromLocationName(location, 1);
Address add = list.get(0);
String locality = add.getLocality();
Toast.makeText(this, locality, Toast.LENGTH_LONG).show();
double lat = add.getLatitude();
double lng = add.getLongitude();
gotoLocation(lat, lng, DEFAULTZOOM);
}
private void hideSoftKeyboard(View v) {
InputMethodManager imm = (InputMethodManager)getSystemService(INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.mapTypeNone:
mMap.setMapType(GoogleMap.MAP_TYPE_NONE);
break;
case R.id.mapTypeNormal:
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
break;
case R.id.mapTypeSatellite:
mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
break;
case R.id.mapTypeTerrain:
mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
break;
case R.id.mapTypeHybrid:
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
break;
case R.id.gotoCurrentLocation:
gotoCurrentLocation();
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onStop() {
super.onStop();
MapStateManager mgr = new MapStateManager(this);
mgr.saveMapState(mMap);
}
@Override
protected void onResume() {
super.onResume();
MapStateManager mgr = new MapStateManager(this);
CameraPosition position = mgr.getSavedCameraPosition();
if (position != null) {
CameraUpdate update = CameraUpdateFactory.newCameraPosition(position);
mMap.moveCamera(update);
// This is part of the answer to the code challenge
mMap.setMapType(mgr.getSavedMapType());
}
}
protected void gotoCurrentLocation() {
}
@Override
public void onConnectionFailed(ConnectionResult arg0) {
// TODO Auto-generated method stub
}
@Override
public void onConnected(Bundle arg0) {
Toast.makeText(this, "Connected to location service", Toast.LENGTH_SHORT).show();
}
@Override
public void onConnectionSuspended(int arg0) {
// TODO Auto-generated method stub
}
}
package com.example.gmapsapp;
导入java.io.IOException;
导入java.util.List;
导入android.app.Dialog;
导入android.location.Address;
导入android.location.Geocoder;
导入android.os.Bundle;
导入android.support.v4.app.FragmentActivity;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.view.view;
导入android.view.inputmethod.InputMethodManager;
导入android.widget.EditText;
导入android.widget.Toast;
导入com.google.android.gms.common.ConnectionResult;
导入com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
导入com.google.android.gms.common.GooglePlayServicesUtil;
导入com.google.android.gms.common.api.GoogleAppClient;
导入com.google.android.gms.location.LocationClient;
导入com.google.android.gms.maps.CameraUpdate;
导入com.google.android.gms.maps.CameraUpdateFactory;
导入com.google.android.gms.maps.GoogleMap;
导入com.google.android.gms.maps.SupportMapFragment;
导入com.google.android.gms.maps.model.CameraPosition;
导入com.google.android.gms.maps.model.LatLng;
公共类MainActivity扩展FragmentActivity实现GoogleAppClient.ConnectionCallbacks、GoogleAppClient.OnConnectionFailedListener{
私人静态最终内部GPS错误对话框请求=9001;
@抑制警告(“未使用”)
专用静态最终int连接故障解决请求=9002;
谷歌地图;
@抑制警告(“未使用”)
私人静态最终双人西雅图_LAT=47.60621,
西雅图液化天然气=-122.33207,
悉尼时间=-33.867487,
悉尼液化天然气=151.20699,
纽约拉特=40.714353,
纽约液化天然气=-74.005973;
私有静态最终浮点默认缩放=15;
@抑制警告(“未使用”)
私有静态最终字符串LOGTAG=“Maps”;
地点客户M地点客户;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
if(servicesOK()){
setContentView(R.layout.activity_map);
if(initMap()){
//mMap.setMyLocationEnabled(真);
mLocationClient=newlocationclient(this,(ConnectionCallbacks)this,this);
mLocationClient.connect();
}
否则{
Toast.makeText(此“地图不可用!”,Toast.LENGTH_SHORT.show();
}
}
否则{
setContentView(R.layout.activity_main);
}
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
公共布尔服务sok(){
int isAvailable=GooglePlayServicesUtil.isGooglePlayServicesAvailable(此);
if(isAvailable==ConnectionResult.SUCCESS){
返回true;
}
else if(GooglePlayServicesUtil.isUserRecoverableError(isAvailable)){
Dialog Dialog=GooglePlayServicesUtil.getErrorDialog(此为GPS\u ERRORDIALOG\u请求可用);
dialog.show();
}
否则{
Toast.makeText(这是“无法连接到Google Play服务”,Toast.LENGTH_SHORT.show();
}
返回false;
}
私有布尔initMap(){
如果(mMap==null){
SupportMapFragment mapFrag=
(SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
mMap=mapFrag.getMap();
}
返回值(mMap!=null);
}
@抑制警告(“未使用”)
私人空位(双lat、双lng){
LatLng ll=新LatLng(lat,lng);
CameraUpdate update=CameraUpdateFactory.newLatLng(ll);
移动摄像头(更新);
}
私人空位(双lat、双lng、,
浮动(缩放){
LatLng ll=新LatLng(lat,lng);
CameraUpdate update=CameraUpdateFactory.newLatLngZoom(ll,缩放);
移动摄像头(更新);
}
公共void地理定位(视图v)引发IOException{
隐藏键盘(v);
EditText et=(EditText)findViewById(R.id.editText1);
字符串位置=et.getText().toString();
地理编码器gc=新地理编码器(本);
List List=gc.getFromLocationName(位置,1);
地址add=list.get(0);
String locality=add.getLocality();
Toast.makeText(this,locality,Toast.LENGTH_LONG).show();
double lat=add.getLatitude();
double lng=add.getLongitude();
gotoLocation(拉丁美洲、液化天然气、天然气);
}
专用无效隐藏键盘(视图v){
InputMethodManager imm=(InputMethodManager)getSystemService(输入方法服务);
imm.hideSoftInputFromWindow(v.getWindowToken(),0);
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
开关(item.getItemId()){
案例R.id.mapTypeNone:
mMap.setMapType(GoogleMap.MAP\u TYPE\u NONE);
打破
案例R.id.mapTypeNormal:
mMap.setMapType(GoogleMap.MAP\u TYPE\u NORMAL);
打破
案例R.id.mapTypeSatellite:
mMap.setMapType(GoogleMap.MAP_TYPE_卫星);
打破
案例R.id.mapTypeTerrain:
mMap.setMapType(GoogleMap.MAP\u TYPE\u地形);
打破
案例R.id.mapTypeH
GooglePlayServicesClient.ConnectionCallbacks
GooglePlayServicesClient.OnConnectionFailedListener