没有足够的地理位置权限Android Webview

Question

晚上好我正在使用Webview在Android上制作跟踪应用程序。我遇到了问题，因为该系统在该位置附近运行良好。我试过Grishma Ukani先生的一些方法（非常感谢）。

package com.example.webview;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.GeolocationPermissions;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;

/**
* A minimal WebView app with HTML5 geolocation capability
*
* @author David M. Chandler
*/
public class GeoWebViewActivity extends Activity {

/**
 * 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);
    }
}

WebView mWebView;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mWebView = (WebView) findViewById(R.id.webView1);
    // Brower niceties -- pinch / zoom, follow links in place
    mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
    mWebView.getSettings().setBuiltInZoomControls(true);
    mWebView.setWebViewClient(new GeoWebViewClient());
    // Below required for geolocation
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.getSettings().setGeolocationEnabled(true);
    mWebView.setWebChromeClient(new GeoWebChromeClient());
    // Load google.com
    mWebView.loadUrl("http://www.google.com");
}

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

一切顺利，没有错误。但仍然无法获得设备位置/权限，然后这些信息就会出现在android studio上

E/cr_LocationProvider：从系统注册位置更新时捕获安全异常应用程序没有足够的地理定位权限E/cr_LocationProvider： newError可用的应用程序没有足够的地理定位权限。

然后我试图修改链接从不够的地理定位权限，并把这个修改我的公共类GeoWebViewActive扩展活动

private static final int REQUEST_FINE_LOCATION = 1;
private String mGeolocationOrigin;
private GeolocationPermissions.Callback mGeolocationCallback;

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(GeoWebViewActivity.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(GeoWebViewActivity.this, perm)) {
                // ask the user for permission
                ActivityCompat.requestPermissions(GeoWebViewActivity.this, new String[] {perm}, REQUEST_FINE_LOCATION);

                // we will use these when user responds
                mGeolocationOrigin = origin;
                mGeolocationCallback = callback;
            }
        }
    }

    @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 (mGeolocationCallback != null) {
                    // call back to web chrome client
                    mGeolocationCallback.invoke(mGeolocationOrigin, allow, false);
                }
                break;
        }
    }
}

但有一些错误：

1. 错误：（67，66）错误：找不到符号类非空

任何帮助和建议的另一种方法将非常感激。

Answer 1

您需要导入nonNull注释。

添加import javax。注释。非空对于你的导入，你可以在类的顶部找到它们
您的类可能在一个包中，您需要在GeoWebChromeClient类中声明该包。请注意，您有一行包com。实例网络视图 位于GeoWebViewActivity类的顶部，指示该类位于内/com/example/webview。如果不再是内部类，则需要在GeoWebChromeClient中使用类似的包行。