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，因为系统在该位置旁边都运行良好。我尝试过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。但仍无法获得设备位置/权限，然后此信息出现在android studio

E / cr_LocationProvider：从系统注册位置更新时捕获到安全性异常。该应用程序没有足够的地理定位权限。 E / cr_LocationProvider：newErrorAvailable应用程序没有足够的地理定位权限。

然后我尝试使用Insufficient geolocation permissions的链接进行修改并将此修改放在我的公共类GeoWebViewActivity extends

上

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：

错误：（67,66）错误：找不到符号类NonNull
错误：（50,22）错误：包构建不存在
错误：（66,9）错误：方法不会覆盖或实现超类型的方法
错误：（68,18）错误：找不到符号方法onRequestPermissionsResult（int，String []，int []）。

对于其他方法的任何帮助和建议都将非常感激。

Answer 1

您需要导入NonNull注释。

将import javax.annotation.Nonnull;添加到您的导入中，您可以在课程顶部找到它们你的类可能在一个包中，你需要在GeoWebChromeClient类中声明该包。请注意，package com.example.webview;类顶部有一行GeoWebViewActivity，表示此类位于../com/example/webview内。如果它不再是内部类，则需要GeoWebChromeClient中的类似包行。

没有足够的Geolocation权限Android Webview

1 个答案: