如何使用LocationManager在android中获取当前位置
每当我使用LocationManager和LocationListener时, 在使用AndroidSimulator时,我得到了位置, 设置纬度和经度时使用额外的工具 我查看了其他问题的答案,但我对Android开发还不熟悉,所以我真的无法理解答案。所以我提出了一个新的问题,我希望能对我的代码进行审查。谢谢 但是,当我在物理设备上运行时,我的代码在启动时不会给出我的当前位置。如何获取当前位置?我还尝试了getLastKnownLocation,但即使这样也不起作用如何使用LocationManager在android中获取当前位置,android,location,locationmanager,locationlistener,Android,Location,Locationmanager,Locationlistener,每当我使用LocationManager和LocationListener时, 在使用AndroidSimulator时,我得到了位置, 设置纬度和经度时使用额外的工具 我查看了其他问题的答案,但我对Android开发还不熟悉,所以我真的无法理解答案。所以我提出了一个新的问题,我希望能对我的代码进行审查。谢谢 但是,当我在物理设备上运行时,我的代码在启动时不会给出我的当前位置。如何获取当前位置?我还尝试了getLastKnownLocation,但即使这样也不起作用 package com.lo
package com.londonappbrewery.climapm;
import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.JsonHttpResponseHandler;
import com.loopj.android.http.RequestParams;
import org.json.JSONObject;
import cz.msebera.android.httpclient.Header;
public class WeatherController extends AppCompatActivity {
// Constants:
final String WEATHER_URL = "http://api.openweathermap.org/data/2.5/weather";
// App ID to use OpenWeather data
final String APP_ID = "5563c6a4ddd7d7181b257988cc2b1ad1";
// Time between location updates (5000 milliseconds or 5 seconds)
final long MIN_TIME = 5000;
// Distance between location updates (1000m or 1km)
final float MIN_DISTANCE = 1000;
//Request Code
final int REQUEST_CODE = 123;
// TODO: Set LOCATION_PROVIDER here:
String LOCATION_PROVIDER = LocationManager.GPS_PROVIDER;
// Member Variables:
TextView mCityLabel;
ImageView mWeatherImage;
TextView mTemperatureLabel;
// TODO: Declare a LocationManager and a LocationListener here:
LocationManager mLocationManager;
LocationListener mLocationListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.weather_controller_layout);
// Linking the elements in the layout to Java code
mCityLabel = (TextView) findViewById(R.id.locationTV);
mWeatherImage = (ImageView) findViewById(R.id.weatherSymbolIV);
mTemperatureLabel = (TextView) findViewById(R.id.tempTV);
ImageButton changeCityButton = (ImageButton) findViewById(R.id.changeCityButton);
// TODO: Add an OnClickListener to the changeCityButton here:
changeCityButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(WeatherController.this, ChangeCityController.class);
startActivity(intent);
}
});
}
// TODO: Add onResume() here:
@Override
protected void onResume() {
super.onResume();
Log.d("Clima", "onResume() called");
Intent intent = getIntent();
String cityName = intent.getStringExtra("cityName");
if (cityName != null) {
//Log.d("Clima", cityName);
getWeatherForNewCity(cityName);
} else {
Log.d("Clima", "Getting weather for current location");
getWeatherForCurrentLocation();
}
}
// TODO: Add getWeatherForNewCity(String city) here:
private void getWeatherForNewCity(String city) {
RequestParams params = new RequestParams();
params.put("q", city);
params.put("appid", APP_ID);
letsDoSomeNetworking(params);
}
// TODO: Add getWeatherForCurrentLocation() here:
private void getWeatherForCurrentLocation() {
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
//Log.d("Clima", "");
String latitude = String.valueOf(location.getLatitude());
String longitude = String.valueOf(location.getLongitude());
Log.d("Clima", "onLocationChanged() callback received");
Log.d("Clima", "Latitude is " + latitude);
Log.d("Clima", "Longitude is " + longitude);
RequestParams params = new RequestParams();
params.put("lat", latitude);
params.put("lon", longitude);
params.put("appid", APP_ID);
letsDoSomeNetworking(params);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
Log.d("Clima", "onProviderDisabled() callback received");
}
};
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE);
return;
}
mLocationManager.requestLocationUpdates(LOCATION_PROVIDER, MIN_TIME, MIN_DISTANCE, mLocationListener);
Location location = mLocationManager.getLastKnownLocation(LOCATION_PROVIDER);
if(location != null) {
RequestParams params = new RequestParams();
params.put("lat", location.getLatitude());
params.put("lon", location.getLongitude());
params.put("appid", APP_ID);
letsDoSomeNetworking(params);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_CODE) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Log.d("Clima", "onRequestPermissionResult(): Permission Granted!");
//mLocationManager.requestLocationUpdates(LOCATION_PROVIDER, MIN_TIME, MIN_DISTANCE, mLocationListener);
getWeatherForCurrentLocation();
}
}
}
// TODO: Add letsDoSomeNetworking(RequestParams params) here:
private void letsDoSomeNetworking(RequestParams params) {
AsyncHttpClient client = new AsyncHttpClient();
client.get(WEATHER_URL, params, new JsonHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] header, JSONObject response) {
Log.d("Clima", "Success! JSON : " + response.toString());
WeatherDataModel weatherData = WeatherDataModel.fromJSON(response);
// Log.d("Clima", weatherData.getTemperature()); << WORKING
updateUI(weatherData);
}
@Override
public void onFailure(int statusCode, Header[] header, Throwable e, JSONObject response) {
Log.e("Clima", e.toString());
Log.d("Clima", String.valueOf(statusCode));
Toast.makeText(WeatherController.this, "Request Failed!", Toast.LENGTH_SHORT).show();
}
});
}
// TODO: Add updateUI() here:
private void updateUI(WeatherDataModel weatherData){
mTemperatureLabel.setText(weatherData.getTemperature());
mCityLabel.setText(weatherData.getCity());
int resourceID = getResources().getIdentifier(weatherData.getIconName(), "drawable", getPackageName());
mWeatherImage.setImageResource(resourceID);
}
// TODO: Add onPause() here:
}
package com.londonappbrewery.climapm;
导入android.Manifest;
导入android.content.Context;
导入android.content.Intent;
导入android.content.pm.PackageManager;
导入android.location.location;
导入android.location.LocationListener;
导入android.location.LocationManager;
导入android.os.Bundle;
导入android.support.annotation.NonNull;
导入android.support.v4.app.ActivityCompat;
导入android.support.v7.app.AppActivity;
导入android.util.Log;
导入android.view.view;
导入android.widget.ImageButton;
导入android.widget.ImageView;
导入android.widget.TextView;
导入android.widget.Toast;
导入com.loopj.android.http.AsyncHttpClient;
导入com.loopj.android.http.JsonHttpResponseHandler;
导入com.loopj.android.http.RequestParams;
导入org.json.JSONObject;
导入cz.msebera.android.httpclient.Header;
公共类WeatherController扩展AppCompative活动{
//常数:
最终字符串WEATHER_URL=”http://api.openweathermap.org/data/2.5/weather";
//使用OpenWeather数据的应用程序ID
最终字符串APP_ID=“5563C6A4DD7D7181B257988CC2B1AD1”;
//位置更新之间的时间(5000毫秒或5秒)
最终长最小时间=5000;
//位置更新之间的距离(1000米或1公里)
最终浮动最小距离=1000;
//请求代码
最终int请求_代码=123;
//TODO:在此处设置位置\u提供程序:
字符串LOCATION\u PROVIDER=LocationManager.GPS\u PROVIDER;
//成员变量:
文本视图mCityLabel;
ImageView mWeatherImage;
text查看MTTemperatureLabel;
//TODO:在此处声明LocationManager和LocationListener:
地点经理M地点经理;
LocationListener mLocationListener;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.weather\u controller\u layout);
//将布局中的元素链接到Java代码
mCityLabel=(TextView)findViewById(R.id.locationTV);
mWeatherImage=(ImageView)findViewById(R.id.V);
MTTemperatureLabel=(TextView)findViewById(R.id.v);
ImageButton changeCityButton=(ImageButton)findViewById(R.id.changeCityButton);
//TODO:在此处向changeCityButton添加OnClickListener:
changeCityButton.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意向意向=新意向(WeatherController.this、ChangeCityController.class);
星触觉(意向);
}
});
}
//TODO:在此处添加onResume():
@凌驾
受保护的void onResume(){
super.onResume();
d(“Clima”,“onResume()调用”);
Intent=getIntent();
String cityName=intent.getStringExtra(“cityName”);
if(cityName!=null){
//Log.d(“Clima”,cityName);
getWeatherForNewCity(城市名称);
}否则{
Log.d(“Clima”,“获取当前位置的天气”);
getWeatherForCurrentLocation();
}
}
//TODO:在此处添加getWeatherForNewCity(字符串城市):
NewCity(StringCity)的私人酒店{
RequestParams params=新的RequestParams();
参数put(“q”,城市);
参数put(“appid”,APP_ID);
letsDoSomeNetworking(参数);
}
//TODO:在此处添加getWeatherForCurrentLocation():
私有void getWeatherForCurrentLocation(){
mLocationManager=(LocationManager)getSystemService(Context.LOCATION\u服务);
mlLocationListener=新位置Listener(){
@凌驾
已更改位置上的公共无效(位置){
//Log.d(“Clima”,“Clima”);
String latitude=String.valueOf(location.getLatitude());
String longitude=String.valueOf(location.getLongitude());
d(“收到Clima”、“onLocationChanged()回调”);
Log.d(“高潮”,“纬度是”+纬度);
Log.d(“Clima”,“经度为”+经度);
RequestParams params=新的RequestParams();
参数put(“纬度”,纬度);
参数put(“lon”,经度);
参数put(“appid”,APP_ID);
letsDoSomeNetworking(参数);
}
@凌驾
public void onStatusChanged(字符串提供程序、int状态、Bundle extra){
}
@凌驾
公共无效onProviderEnabled(字符串提供程序){
}
@凌驾
公共无效onProviderDisabled(字符串提供程序){
d(“收到Clima”、“onProviderDisabled()回调”);
}
};
if(ActivityCompat.checkSelfPermission(this,Manifest.permission.ACCESS\u FINE\u LOCATION)!=PackageManager.permission\u已授予和&ActivityCompat.checkSelfPermission(this,Manifest.permission.ACCESS\u LOCATION)!=PackageManager.permission\u已授予){
考虑到呼叫
//ActivityCompat#请求权限
//在此处请求缺少的权限,然后覆盖
//public void onRequestPermissionsResult(int-requestCode,字符串[]权限,
//国际[]格兰特雷苏
LocationManager locationManager =
(LocationManager)getSystemService(Context.LOCATION_SERVICE);
boolean networkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
Location location;
if(networkEnabled){
longitude=location.getLongitude();
latitude=location.getLatitude();
}
}
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>