应用

时间:2017-07-27 22:20:53

标签: android google-maps google-maps-api-3

我们有Google Maps API正常运行;但是,当前位置不会显示在我们的应用中,但会在重定向到Google地图(应用)时显示。我们希望蓝点显示在我们的应用中,而不仅仅是将其转发到Google地图(应用)。

以下是一些代码段(我们使用的是Android Studio V2.3.3):

有人可以提供任何指导吗?

这是我们的MapActivity.java

package com.example.administrator.bubbleproject;
import android.Manifest;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapActivity extends FragmentActivity implements OnMapReadyCallback {
    private GoogleMap mMap;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        LatLng losAngeles = new LatLng(34.0522, -118.2437);
        mMap.addMarker(new MarkerOptions().position(losAngeles).title("Los Angeles"));
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(losAngeles, 18.0f));
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        mMap.setMyLocationEnabled(true);
    }
}

这是我们的Manifest.xml

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

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="BUBBLE"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"
            android:parentActivityName="com.example.administrator.bubbleproject.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".tracker1PageActivity"
            android:parentActivityName=".MainActivity" />

        <activity android:name=".settingsActivity" />
        <activity android:name=".setupActivity" />

        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />
        <activity
            android:name=".MapActivity"
            android:label="@string/title_activity_map">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

以下是My appForwarded to google maps的一些屏幕截图。

1 个答案:

答案 0 :(得分:0)

我的猜测是,在OnMapReady()您的权限检查失败并且正在执行return;而不是调用mMap.setMyLocationEnabled(true);设置断点并进行检查。

我检查此代码的代码如下所示:

public static boolean haveLocationPermission(Context context)
{
    return ContextCompat.checkSelfPermission(context, permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED ||
               ContextCompat.checkSelfPermission(context, permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED;
}

如果要检查权限,请调用此代码段:

// Enable my location if we have permission
if (haveLocationPermission(getActivity()))
{
    try
    {
        mMap.setMyLocationEnabled(true);
    }
    catch (SecurityException e) {}
}

我们也启用了位置服务,但我不确定地图是否有必要显示位置(使用带有LocationServices.API的GoogleApiClient)。

编辑:从重复问题看起来您确实需要启用位置服务。 https://stackoverflow.com/a/34582595/1022886