如何使用FusedLocationProviderClient通过Google API获取当前位置

时间：2018-06-14 07:47:39

标签： android google-api

我想通过Google API了解我当前的位置。在下面显示的代码中，我使用了FusedLocationApi这是不推荐的，而我应该使用FusedLocationProviderClient我不知道如何使用我也读过Android官方文档，但没有达到目的。以下是我的AndroidManifest.xml和MainActivity.java文件：

我还添加了依赖项：

implementation 'com.google.android.gms:play-services-location:15.0.1'

的AndroidManifest.xml 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.hp.location2">

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />

    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

MainActivity.java 

package com.example.hp.location2;

import android.Manifest;

import android.content.pm.PackageManager;
import android.location.Location;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity implements
    GoogleApiClient.ConnectionCallbacks, 
GoogleApiClient.OnConnectionFailedListener {


private static final String TAG = "MyApps-Location2";
private GoogleApiClient mGoogleApiClient;
private Location mLastLocation;
private TextView mLatitudeText;
private TextView mLongitudeText;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mLatitudeText = findViewById(R.id.latitude_text);
    mLongitudeText = findViewById(R.id.longitude_text);

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

@Override
protected void onStart() {
    super.onStart();
    mGoogleApiClient.connect();
    Log.i(TAG, "GoogleApiClient Connected");
}

@Override
protected void onStop() {
    super.onStop();

    if (mGoogleApiClient.isConnected()) {
        mGoogleApiClient.disconnect();
        Log.i(TAG, "GoogleApiClient DisConnected");
    }
}

@Override
public void onConnected(@Nullable Bundle bundle) {

    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.
        return;
    }
    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    if(mLastLocation != null) {
        mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
        mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
    }

}

@Override
public void onConnectionSuspended(int i) {
    Log.i(TAG, "onConnectionSuspended");
}

@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
    Log.i(TAG, "onConnectionFailed");
}
}

如果我得到工作代码，那将会很棒。

谢谢

1 个答案:

答案 0 :(得分：0)

FusedLocationProviderClient有两种方法可以帮助您获取当前位置。 1.通过LocationCallBack方法，您将获得您的位置。 2.在OnConnected方法中，将使用该位置更新loactionCallBAcks和fusedLocationClient。

我修改了您的代码，请检查以下代码。

import android.Manifest;

import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MainActivity extends AppCompatActivity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {


    private static final String TAG = "MyApps-Location2";
    private GoogleApiClient mGoogleApiClient;
    private Location mLastLocation;
    private TextView mLatitudeText;
    private TextView mLongitudeText;
    private FusedLocationProviderClient mFusedLocationClient;
    private LocationCallback mLocationCallback;

    private LocationRequest locationRequest;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            //checkPermissions();
        }

        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);


        mLocationCallback = new LocationCallback() {
            @Override
            public void onLocationResult(LocationResult locationResult) {
                for (Location location : locationResult.getLocations()) {

                    LatLng latLng = new LatLng(location.getLatitude(),location.getLongitude());

                    Log.d("StackProblem",latLng+"");


                    mFusedLocationClient.removeLocationUpdates(mLocationCallback);

                }
            };
        };


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

    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
        Log.i(TAG, "GoogleApiClient Connected");
    }

    @Override
    protected void onStop() {
        super.onStop();

        if (mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
            Log.i(TAG, "GoogleApiClient DisConnected");
        }
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {



        locationRequest = new LocationRequest();
        locationRequest.setInterval(2000);
        locationRequest.setFastestInterval(2000);
        locationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mFusedLocationClient.requestLocationUpdates(locationRequest,mLocationCallback,null);
        }


    }

    @Override
    public void onConnectionSuspended(int i) {
        Log.i(TAG, "onConnectionSuspended");
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        Log.i(TAG, "onConnectionFailed");
    }
}

我写了 Log.d（“StackProblem”，latLng +“”）; ，你得到纬度和经度，只需尝试latlng.getLatitude和latLng.getLongitude等方法。

希望能帮助。

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