我从这里复制代码以获取我的应用中的坐标http://rdcworld-android.blogspot.hr/2012/01/get-current-location-coordinates-city.html 无论如何，当我按下＃34;获取位置＆＃34;按钮，应用程序崩溃和退出。
MainActivity.java
package com.lipa.flashlight;
import android.*;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.ParcelFileDescriptor;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
import android.view.View.OnClickListener;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
public class Main2Activity extends AppCompatActivity implements OnClickListener {
private LocationManager locationManager = null;
private LocationListener locationListener = null;
private Button location = null;
private EditText editLocation = null;
private ProgressBar pb =null;
private static final String TAG = "Debug";
private Boolean flag = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
pb = (ProgressBar) findViewById(R.id.progressBar1);
pb.setVisibility(View.INVISIBLE);
editLocation = (EditText) findViewById(R.id.editTextLocation);
location = (Button) findViewById(R.id.location);
location.setOnClickListener(this);
}
@Override
public void onClick(View v) {
flag = displayGpsStatus();
if (flag) {
Log.v(TAG, "onClick");
editLocation.setText("Please! move your device to" +
" see the changes in coordinates." + "\nWait...");
pb.setVisibility(View.VISIBLE);
locationListener = new MyLocationListener();
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
} else {
alertbox("GPS STATUS!!", "Your GPS is: OFF");
}
}
private Boolean displayGpsStatus(){
ContentResolver contentResolver = getBaseContext().getContentResolver();
boolean gpsStatus = Settings.Secure.isLocationProviderEnabled(contentResolver, LocationManager.GPS_PROVIDER);
if(gpsStatus){
return true;
}else{
return false;
}
}
protected void alertbox(String title, String mymessage){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Your Device's GPS is disabled")
.setCancelable(false)
.setTitle("** Gps Status **")
.setPositiveButton("Gps On", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id) {
Intent myIntent = new Intent(
Settings.ACTION_SECURITY_SETTINGS);
startActivity(myIntent);
dialog.cancel();
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id){
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
private class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location loc){
editLocation.setText("");
pb.setVisibility(View.INVISIBLE);
Toast.makeText(getBaseContext(),"Location changed: Lat: "+
loc.getLatitude()+" Lng: " + loc.getLongitude(), Toast.LENGTH_SHORT).show();
String longitude = "Longitude: " +loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " +loc.getLatitude();
Log.v(TAG, latitude);
String cityName=null;
Geocoder gcd = new Geocoder(getBaseContext(),
Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(), loc
.getLongitude(), 1);
if (addresses.size() > 0)
System.out.println(addresses.get(0).getLocality());
cityName=addresses.get(0).getLocality();
} catch (IOException e) {
e.printStackTrace();
}
String s = longitude+"\n"+latitude +
"\n\nMy Currrent City is: "+cityName;
editLocation.setText(s);
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider,
int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
}
XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="1">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Get Current Location and City Name"
android:layout_weight="0.20"
android:gravity="center"
android:textSize="20sp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.33"
android:id="@+id/editTextLocation"
android:editable="false">
<requestFocus></requestFocus>
</EditText>
<LinearLayout
android:id="@+id/layButtonH"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:gravity="center"
android:layout_weight="0.15">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Location"
android:id="@+id/location"></Button>
</LinearLayout>
<LinearLayout
android:id="@+id/layloadingH"
android:layout_height="wrap_content"
android:layout_weight="0.20"
android:layout_width="fill_parent"
android:gravity="center">
<ProgressBar
android:layout_width="wrap_content"
android:id="@+id/progressBar1"
android:layout_height="wrap_content"></ProgressBar>
</LinearLayout>
</LinearLayout>
答案 0 :(得分：0)
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
return;
}
该应用是否有权限？如果没有，您的代码将无法访问requestLocationUpdates。
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
minDistance参数还可用于控制位置更新的频率。如果它大于0，那么位置提供者只会在位置至少改变minDistance米时向您的应用程序发送更新，并且至少已经过了minTime毫秒
从LocationManager documentation
中考虑此部分at least minDistance meters, AND at least minTime milliseconds have passed