Unity2017在安卓下获取GPS位置时闪退的解决办法

在Unity使用低功耗蓝牙通信（BLE）需要用到设备的位置信息。但是调用Input.location.Start()程序会闪退。

解决办法：调用原生安卓接口。 

参见《Unity2021通过aar调用Android方法》编写一个aar插件gpsplugin，在插件中提供获取GPS位置的接口StartGPSLocation，插件代码如下

package com.example.gpsplugin;import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;public class GPSPluginInstance {private LocationManager locationManager;private LocationListener locationListener;private static final int REQUEST_LOCATION_PERMISSION = 1;double latitude = 0.0;double longitude = 0.0;public int Add(int i, int j) {return i + j;}private static Activity unityActivity;public static void receiveUnityActivity(Activity tActivity) {unityActivity = tActivity;}public void Toast(String msg) {Toast.makeText(unityActivity, msg, Toast.LENGTH_SHORT).show();}public void StartGPSLocation() {// 初始化 LocationManagerlocationManager = (LocationManager) unityActivity.getSystemService(Context.LOCATION_SERVICE);// 创建 LocationListenerif(locationListener == null){locationListener = new LocationListener() {@Overridepublic void onLocationChanged(Location location) {if (location != null) {latitude = location.getLatitude();longitude = location.getLongitude();}}@Overridepublic void onStatusChanged(String provider, int status, Bundle extras) {// 状态改变时调用}@Overridepublic void onProviderEnabled(String provider) {// 提供者启用时调用}@Overridepublic void onProviderDisabled(String provider) {// 提供者禁用时调用}};}locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 0, locationListener);}
}

AndroidManifest.xml中添加蓝牙和位置权限（注意Android12以上和之前的版本不一样）

  <uses-permission android:name="android.permission.BLUETOOTH_SCAN" /><uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />  <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/><uses-permission android:name="android.permission.BLUETOOTH"/><uses-feature android:name="android.hardware.bluetooth_le" android:required="false"/><uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

Unity代码，在使用Input.location.Start()的地方替换成StartGPSLocation就行了

public class BLEBluetoothGunMgr : MonoBehaviour
{void Start(){InitializePlugin("com.example.gpsplugin.GPSPluginInstance");}public void GetPos(){   //Input.location.Start()StartGPSLocation();}void InitializePlugin(string pluginName){unityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");unityActivity = unityClass.GetStatic<AndroidJavaObject>("currentActivity");_pluginInstance = new AndroidJavaObject(pluginName);if (_pluginInstance == null){Debug.Log("Plugin Instance Error");}_pluginInstance.CallStatic("receiveUnityActivity", unityActivity);}public void Toast(){if (_pluginInstance != null){_pluginInstance.Call("Toast", "Hi,from Unity");}}public void StartGPSLocation(){if (_pluginInstance != null){_pluginInstance.Call("StartGPSLocation");}}
}