java - 地理位置权限不足

Question

我正在开发一个 Android 项目。基本上，我正在尝试运行显示 Google map 的 WebView。

我想显示我自己的位置，但是当我为此按下按钮时，出现如下异常:

11-18 17:29:56.237 7678-7678/com.example.ali.bellsolution E/LocationProvider: Caught security exception while registering for location updates from the system. The application does not have sufficient geolocation permissions.
11-18 17:29:56.257 7678-7678/com.example.ali.bellsolution E/LocationProvider: Caught security exception while registering for location updates from the system. The application does not have sufficient geolocation permissions.
11-18 17:29:56.260 7678-7678/com.example.ali.bellsolution E/LocationProvider: Caught security exception while registering for location updates from the system. The application does not have sufficient geolocation permissions.

我已将这些权限添加到 list 文件中:

<uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

MainActivity.java:

package com.example.ali.bellsolution;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.GeolocationPermissions;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {

    private static final int REQUEST_FINE_LOCATION = 0;

    WebView myWebView;

    String mapPath = "https://www.google.co.uk/maps/@51.5112044,-0.2712415,14z";

    /**
     * WebViewClient subclass loads all hyperlinks in the existing WebView
     */
    public class GeoWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            // When user clicks a hyperlink, load in the existing WebView
            view.loadUrl(url);
            return true;
        }
    }



    /**
     * WebChromeClient subclass handles UI-related calls
     * Note: think chrome as in decoration, not the Chrome browser
     */
    public class GeoWebChromeClient extends WebChromeClient {
        @Override
        public void onGeolocationPermissionsShowPrompt(String origin,
                                                       GeolocationPermissions.Callback callback) {
            // Always grant permission since the app itself requires location
            // permission and the user has therefore already granted it
            callback.invoke(origin, true, false);
        }
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {



        super.onCreate(savedInstanceState);

        loadPermissions(Manifest.permission.ACCESS_COARSE_LOCATION, REQUEST_FINE_LOCATION);

        setContentView(R.layout.activity_main);
        myWebView = (WebView) this.findViewById(R.id.mapview);


        myWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        myWebView.getSettings().setBuiltInZoomControls(true);
        myWebView.setWebViewClient(new GeoWebViewClient());



        myWebView.getSettings().setJavaScriptEnabled(true);
        myWebView.getSettings().setGeolocationEnabled(true);
        myWebView.setWebChromeClient(new GeoWebChromeClient());
        myWebView.loadUrl(mapPath);

    }

    @Override
    public void onBackPressed() {
        // Pop the browser back stack or exit the activity
        if (myWebView.canGoBack()) {
            myWebView.goBack();
        }
        else {
            super.onBackPressed();
        }
    }


    private void loadPermissions(String perm, int requestCode) {
        if (ContextCompat.checkSelfPermission(this, perm) != PackageManager.PERMISSION_GRANTED) {
            if (!ActivityCompat.shouldShowRequestPermissionRationale(this, perm)) {
                ActivityCompat.requestPermissions(this, new String[]{perm}, requestCode);
            }
        }
    }



}

list :

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



    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="23" />



    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="WebViewApp"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <activity android:name=".MainActivity"
                  android:label="WebViewApp"
            >

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

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

</manifest>

Answer 1

您可能希望在需要时向用户请求地理定位权限，但在调用回调之前等待用户的响应:

private static final int REQUEST_FINE_LOCATION = 1;
private String geolocationOrigin;
private GeolocationPermissions.Callback geolocationCallback;

public class GeoWebChromeClient extends WebChromeClient {
    @Override
    public void onGeolocationPermissionsShowPrompt(String origin,
                                                   GeolocationPermissions.Callback callback) {
        // Geolocation permissions coming from this app's Manifest will only be valid for devices with
        // API_VERSION < 23. On API 23 and above, we must check for permissions, and possibly
        // ask for them.
        String perm = Manifest.permission.ACCESS_FINE_LOCATION;
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M ||
                ContextCompat.checkSelfPermission(MainActivity.this, perm) == PackageManager.PERMISSION_GRANTED) {
            // we're on SDK < 23 OR user has already granted permission
            callback.invoke(origin, true, false);
        } else {
            if (!ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, perm)) {
                // ask the user for permission
                ActivityCompat.requestPermissions(MainActivity.this, new String[] {perm}, REQUEST_FINE_LOCATION);

                // we will use these when user responds
                geolocationOrigin = origin;
                geolocationCallback = callback;
            }
        }
    }
}

并接收权限请求的结果:

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
    case REQUEST_FINE_LOCATION:
        boolean allow = false;
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // user has allowed this permission
            allow = true;
        }
        if (geolocationCallback != null) {
            // call back to web chrome client
            geolocationCallback.invoke(geolocationOrigin, allow, false);
        }
        break;
    }
}