了强制关闭的创建活动，如果GPS关闭
问题描述：
朋友
请帮助我。
我已经在我的应用清单上设置了我的活动。
我的源代码是：
package com.widy.ayopuasa;
import java.io.IOException;
import java.util.Calendar;
import java.util.List;
import java.util.Locale;
import com.widy.ayopuasa.service.FormatWaktu;
import com.widy.ayopuasa.service.IbadahService;
import com.widy.ayopuasa.service.PerhitunganShalat;
import com.widy.ayopuasa.service.Variabel;
import android.app.Activity;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class JadwalShalat extends Activity {
public static final String JADWAL = "jadwal";
public static final String JAM_SUBUH = "jamSubuh";
public static final String MENIT_SUBUH = "menitSubuh";
public static int NOTIF_ID = 100;
private int hari;
private int bulan;
private int tahun;
private double zonaWaktu;
public String metode = "";
private float sudutSubuh;
private float sudutIsya;
private int mazhab;
// private PerhitunganShalat shalat;
LocationManager locationManager;
IbadahService updateService = null;
Location location;
PerhitunganShalat shalat;
FormatWaktu subuh;
FormatWaktu dzuhur;
FormatWaktu ashar;
FormatWaktu maghrib;
FormatWaktu isya;
SharedPreferences sharedPreferences;
@Override
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.jadwal_shalat);
Intent svc = new Intent(this, IbadahService.class);
stopService(svc);
NotificationManager mgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mgr.cancel(NOTIF_ID);
// Mengambil text View di layout
TextView waktuSubuh = (TextView) findViewById(R.id.label_subuh_jam);
TextView waktuZuhur = (TextView) findViewById(R.id.label_zuhur_jam);
TextView waktuAshar = (TextView) findViewById(R.id.label_ashar_jam);
TextView waktuMaghrib = (TextView) findViewById(R.id.label_maghrib_jam);
TextView waktuIsya = (TextView) findViewById(R.id.label_isya_jam);
// inisialisasi tanggal sekarang
final Calendar c = Calendar.getInstance();
hari = c.get(Calendar.DAY_OF_MONTH);
bulan = c.get(Calendar.MONTH) + 1;
tahun = c.get(Calendar.YEAR);
zonaWaktu = Variabel.getZonaWaktu();
// inisialisasi Lokasi
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// kriteria penggunaan lokasi
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
criteria.setPowerRequirement(Criteria.POWER_LOW);
criteria.setBearingRequired(false);
criteria.setSpeedRequired(false);
criteria.setCostAllowed(true);
String provider = locationManager.getBestProvider(criteria, true);
location = locationManager.getLastKnownLocation(provider);
double lat= location.getLatitude();
double lon= location.getLongitude();
double alt= location.getAltitude();
//double lat=-6.166666667;
//double lon=106.85;
//double alt=50;
/**
* Untuk menampilkan lokasi user berada pada judul jadwal shalat
*
*/
String namaKota;
String alamat = null;
TextView tv ;
tv = (TextView) findViewById(R.id.label_judul);
if (location!= null){
Geocoder gc = new Geocoder(this, Locale.getDefault());
try{
List<Address> addresses= gc.getFromLocation(lat, lon, 1);
StringBuilder sb= new StringBuilder();
if(addresses.size()>0){
Address address= addresses.get(0);
sb.append(address.getLocality());
}
alamat = sb.toString();
tv.setText(alamat +", "+hari + "-"+bulan +"-"+ tahun);
} catch (IOException e) {}
}else{
tv.setText(hari + "/"+bulan +"/"+ tahun);
}
/**
* Untuk mengambil nilai metode yang telah ditentukan oleh user
*
* @params metode merupakan tempat menyimpan sementara
*/
metode = Pengaturan.getMetodePerhitungan(this);
char a = metode.charAt(0);
switch (a) {
case '0': {
sudutSubuh = 20;
sudutIsya = 18;
}
break;
case '1': {
sudutSubuh = 18;
sudutIsya = 18;
}
break;
case '2': {
sudutSubuh = 15;
sudutIsya = 15;
}
break;
case '3': {
sudutSubuh = 17;
sudutIsya = 18;
}
break;
case '4': {
sudutSubuh = 18;
sudutIsya = (float) 18.5;
}
break;
case '5': {
sudutSubuh = (float) 17.5;
sudutIsya = (float) 19.5;
}
break;
}
/**
* Untuk mengambil nilai mazhab yang sudah ditentukan oleh user
*/
String mzb = Pengaturan.getMazhab(this);
char m = mzb.charAt(0);
mazhab = m == '0' ? 1 : 2;
// Menghitung variabel
shalat= new PerhitunganShalat(lat,lon, alt, zonaWaktu, hari,
bulan, tahun);
shalat.setSudutSubuh(sudutSubuh);
shalat.setSudutIsya(sudutIsya);
shalat.setMazhab(mazhab);
// Untuk mengkonfersi hasil perhitungan dalam format jam.
FormatWaktu subuh = new FormatWaktu(shalat.getWaktuSubuh());
FormatWaktu dzuhur = new FormatWaktu(shalat.getWaktuZuhur());
FormatWaktu ashar = new FormatWaktu(shalat.getWaktuAshar());
FormatWaktu maghrib = new FormatWaktu(shalat.getWaktuMaghrib());
FormatWaktu isya = new FormatWaktu(shalat.getWaktuIsya());
waktuIsya.setText("" + isya.getJam() + ":" + isya.getMenit() + ":"
+ isya.getDetik());
waktuMaghrib.setText("" + maghrib.getJam() + ":" + maghrib.getMenit()
+ ":" + maghrib.getDetik());
waktuSubuh.setText("" + subuh.getJam() + ":" + subuh.getMenit() + ":"
+ subuh.getDetik());
waktuZuhur.setText("" + dzuhur.getJam() + ":" + dzuhur.getMenit() + ":"
+ dzuhur.getDetik());
waktuAshar.setText("" + ashar.getJam() + ":" + ashar.getMenit() + ":"
+ ashar.getDetik());
// untuk menyimpan waktu shalat agar dapat dipanggil di KuplukService
SharedPreferences jadwal = getSharedPreferences(JADWAL, 0);
SharedPreferences.Editor editor = jadwal.edit();
editor.clear();
editor.putInt("hari", hari);
editor.putInt("bulan", bulan);
editor.putInt("tahun", tahun);
editor.putInt("jSubuh", subuh.getJam());
editor.putInt("mSubuh", subuh.getMenit());
editor.putInt("jZuhur", dzuhur.getJam());
editor.putInt("mZuhur", dzuhur.getMenit());
editor.putInt("jAshar", ashar.getJam());
editor.putInt("mAshar", ashar.getMenit());
editor.putInt("jMaghrib", maghrib.getJam());
editor.putInt("mMaghrib", maghrib.getMenit());
editor.putInt("jIsya", isya.getJam());
editor.putInt("mIsya", isya.getMenit());
editor.commit();
// cek keluaran
Log.d("AyoIbadah", "sudut subuh: " + shalat.getSudutSubuh());
Log.d("AyoIbadah", "sudut isya: " + shalat.getSudutIsya());
Log.d("AyoIbadah", "metode: " + metode);
Log.d("AyoIbadah", "mazhab: " + mazhab);
Log.d("AyoIbadah", "zonawaktu: " + zonaWaktu);
Log.d("AyoIbadah", "Jd LOkasi: " + shalat.getJdLokasi());
Log.d("AyoIbadah", "Delta: " + shalat.getDelta());
Log.d("AyoIbadah", "ET: " + shalat.getET());
Log.d("k", "subuh= " + shalat.getWaktuSubuh());
Log.d("AyoIbadah", "zuhur= " + shalat.getWaktuZuhur());
Log.d("AyoIbadah", "Ashar= " + shalat.getWaktuAshar());
Log.d("AyoIbadah", "maghrib= " + shalat.getWaktuMaghrib());
Log.d("k", "isya= " + shalat.getWaktuIsya());
// Inisiasi service
startService(svc);
}
@Override
public void onResume() {
super.onResume();
metode = Pengaturan.getMetodePerhitungan(this);
NotificationManager mNM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNM.cancel(IbadahService.NOTIF_ID);
}
@Override
public void onStop() {
super.onStop();
Intent svc = new Intent(this, IbadahService.class);
startService(svc);
}
}
当我开始我的应用程序，显示错误日志： 07-31 14：49：39.734：ERROR/AndroidRuntime（4163）：java.lang中：通过引起的。的NullPointerException 07-31 14：49：39.734：ERROR/AndroidRuntime（4163）：在com.widy.ayopuasa.JadwalShalat.onCreate（JadwalShalat.java:99）
在线路99我的代码是：
double lat= location.getLatitude();
double lon= location.getLongitude();
double alt= location.getAltitude();
任何人，你能告诉我什么是问题，以及如何解决它？ :)
在此先感谢。
更新： 我已经解决了部队密切同：
String provider = locationManager.getBestProvider(criteria, true);
if (provider != null) {
location = locationManager.getLastKnownLocation(provider);
lat = location.getLatitude();
lon = location.getLongitude();
alt = location.getAltitude();
}else{
location = null;
lat=-6.166666667;
lon=106.85;
alt=50;
}
我不知道这是最好的做法还是坏one..ane建议，朋友？
更新并解决！
准确！
我已将Class MyLocationListener添加到我的源代码中。
并设置这样的类MyLocationListener位置：
public class MyLocationListener implements LocationListener {
public static double latitude;
public static double longitude;
public static double altitude;
public void onLocationChanged(Location loc)
{
loc.getLatitude();
loc.getLongitude();
latitude=loc.getLatitude();
longitude=loc.getLongitude();
altitude=loc.getAltitude();
}
在我的onCreate我已经加入：再一次接近
mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mlocListener);
lon = MyLocationListener.longitude;
lat = MyLocationListener.latitude;
alt = MyLocationListener.altitude;
不强制:)
谢谢大家： ）
答
location在您致电时仍为空。
这从android documentation片段显示了如何实例的侦听器获得位置更新：
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
makeUseOfNewLocation(location);
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
你应该使用，只有当启用了供应商的位置运行代码;检查是否至少有一个启用提供商的呼叫：
public List<String> getProviders (Criteria criteria, boolean enabledOnly)
与enabledOnly = true
getProviders如果没有启用或访问提供商返回null。
答
你以线
double lat= location.getLatitude();一个NullPointerException。
这告诉你location为空。 location设置在上面的行上：
location = locationManager.getLastKnownLocation(provider);。
的docs为LocationManager.getLastKnownLocation()状态：
如果提供的是当前被禁用，则返回null。
所以，我怀疑位置提供商是禁用的。
'locationManager.getLastKnownLocation（provider）;'将在GPS关闭时返回null，所以'location = null'和nullpointer。您应该检查，如果位置为空，然后再使用它 – THelper
对不起，我再也不会这样做，我在这里是新的:)谢谢 – wdyz