Question

我有一个Android服务，我想做以下事情：

单击按钮时，我启动此服务，onCreate（）方法中的toast总是出现，但之后我看不到经度 - 纬度弹出。我的主要目标是在更多的活动中使用这种经度纬度的夫妇。

我怎样才能做到这一点？

我实施了GoogleApiClient.ConnectionCallbacks，GoogleApiClient.OnConnectionFailedListener，com.google.android.gms.location .LocationListener，因为我必须等待20-30秒才能获得坐标。以下代码适用于活动，但不适用于服务。

谢谢！

EDITED ：

package com.si.ou;

import android.app.Service;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.os.IBinder;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;


public class FullAutoService extends Service implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location
                .LocationListener {
    private static final int PERMISSION_REQUEST_ACCESS_FINE_LOCATION = 100;

    private LocationRequest mLocationRequest;
    private GoogleApiClient mGoogleApiClient;
    String loki;

    @Override
    public void onCreate() {

        createLocationRequest();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();

        Toast.makeText(this, "service started....", Toast.LENGTH_SHORT).show();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    private void startLocationUpdates() {
        //noinspection MissingPermission
        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) {
            // 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.
            return;
        }
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
                mLocationRequest, this);
    }

    private void stopLocationUpdates() {
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
    }

    private boolean checkPermissions() {
        return ContextCompat.checkSelfPermission(this, android.Manifest.permission
                .ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED;
    }


    private void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        if (checkPermissions() && mGoogleApiClient.isConnected()) startLocationUpdates();
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }


    @Override
    public void onLocationChanged(Location location) {
        Double lati = location.getLatitude();
        Double longi = location.getLongitude();
        loki = String.valueOf(lati) + ":" + String.valueOf(longi);
        Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {

            @Override
            public void run() {
                Toast.makeText(getApplicationContext(), loki, Toast.LENGTH_SHORT).show();

            }
        });
    }
}

Answer 1

这是因为您正在处理服务。试试这个：

Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {

    @Override
    public void run() {
         Toast.makeText(getApplicationContext(), 
                       getString(R.string.string_id), 
                       Toast.LENGTH_SHORT).show();              
    }
});

Answer 2

无法从后台线程访问任何UI组件。如果需要，请使用handler和sen msg到UI线程并更新UI组件。

服务运行时不会出现祝酒词

2 个答案: