Question

package com.example.simranjeet.myapplication43;

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.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

public class GpsLocation extends AppCompatActivity {
    Context context;
    private LocationManager locationManager;
    private LocationListener listener;


    void findloc(){
        locationManager = (LocationManager)getSystemService(LOCATION_SERVICE);

        listener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {

            }

            @Override
            public void onStatusChanged(String s, int i, Bundle bundle) {

            }

            @Override
            public void onProviderEnabled(String s) {

            }

            @Override
            public void onProviderDisabled(String s) {

                Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                startActivity(i);
            }
        };

        configure_button();
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case 10:
                configure_button();
                break;
            default:
                break;
        }
    }

    void configure_button(){
        // first check for permissions
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.INTERNET}
                        ,10);
            }
            return;
        }

        locationManager.requestLocationUpdates("gps", 500, 0, listener);
        // locationManager.requestSingleUpdate(LocationManager.GPS_PROVIDER,listener,null);
        Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
       Toast.makeText(context,"location finded",Toast.LENGTH_LONG ).show();
        locationManager.removeUpdates(listener);
        // Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    }
}

我从findloc方法中调用onCreate方法为

s = new GpsLocation();
s.findloc();

每次我调用此函数时，它都会崩溃，但是当它运行时它运行良好不放在单独的类中。我添加了所有权限，它是在onCreate方法下，它工作得很好，谁能告诉我为什么它突然崩溃了。

CRASH LOG //我正在使用模拟器

进程：com.example.simranjeet.myapplication43，PID：12956 java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.simranjeet.myapplication43 / com.example.simranjeet.myapplication43.MainActivity}： java.lang.IllegalStateException：系统服务不适用于 onCreate（）之前的活动在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2416）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2476）在android.app.ActivityThread.-wrap11（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1344）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5417）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）原因：java.lang.IllegalStateException：onCreate（）之前Activities无法使用系统服务在android.app.Activity.getSystemService（Activity.java:5253）在com.example.simranjeet.myapplication43.GpsLocation.findloc（GpsLocation.java:25）在com.example.simranjeet.myapplication43.MainActivity.onCreate（MainActivity.java:36）在android.app.Activity.performCreate（Activity.java:6237）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1107）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2369）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2476）在android.app.ActivityThread.-wrap11（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1344）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5417）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616） 07-20 13：01：03.413 3353-12581 / com.google.android.gms.persistent E / NetworkScheduler：提供了无法识别的操作： android.intent.action.PACKAGE_REPLACED

Answer 1

访问https://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/，了解使用GPS和位置管理器的详细教程。

并且您的日志明确指定您需要在gps方法中而不是在之前调用onCreate()方法。

Answer 2

尝试使用。

vfork

代替

locationManager = (LocationManager)getApplicationContext().getSystemService(LOCATION_SERVICE);

为什么调用GPS时App崩溃？

2 个答案: