【发布时间】：2015-11-18 17:39:30
【问题描述】：
我正在开发一个 Android 项目。基本上，我正在尝试运行显示 Google 地图的 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清单文件中：
<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);
}
}
}
}
清单：
<?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>
【问题讨论】：
-
您在哪个版本的 Android 上进行测试？你的
targetSdkVersion是什么？ -
@CommonsWare 我的目标sdk版本是23
-
@CommonsWare 嘿，感谢您的复制，我已将目标 SDK 降至 22 并使用 loadpermissions 方法。它仍然不起作用。请查看编辑后的代码
-
您的
loadPermissions()不会与 22 AFAIK 的targetSdkVersion一起使用，这是一个有缺陷的实现，targetSdkVersion为 23（您无需等待用户授予权限即可继续)。在 Android 5.1 或更低版本上试用您的应用。如果它有效，那么问题可能与 Android 6.0 的运行时权限有关，并且由于某种原因，targetSdkVersion的 22 可能对WebView没有帮助。如果它在 Android 5.1 或更早版本上失败，那么您还有其他问题，在这种情况下，我建议您发布整个清单。 -
@CommonsWare 感谢我尝试你的建议