在 Webview 上启用地理位置 [英] Enable GeoLocation On Webview

问题描述

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运行良好.

Good Evening. I'm on making Tracking Application on Android using Webview. i got problem because the system all works well beside the location.

在清单中我已经获得了这个权限设置

in manifest i got this permission settings already

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

在 mainactivity.java 中我得到了这个

and in mainactivity.java i got this

public class MainActivity extends AppCompatActivity {

public WebView webView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);

    webView = (WebView)findViewById(R.id.webView);
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webView.loadUrl("https://www.primaniagatracking.com/slogin.php");
    webView.setWebViewClient(new WebViewClient());
}}

我不知道通过总是出现请求许可或其他东西来使其正常工作可能缺少什么.需要很大的帮助.谢谢.我搜索了一些关于启用权限的模板，但出现了很多错误.

i don't know what missing to make it works may be by always appearing ask permission or something. need big help. thanks. i've searched some template regarding the enable permission but got to much error.

推荐答案

一、Android清单:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.webview"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="5" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".GeoWebViewActivity"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.NoTitleBar" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

ma​​in.xml

<?xml version="1.0" encoding="utf-8"?>
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/webView1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

最后，这里是完整的应用程序，仅包含 GeoWebViewActivity:

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) {
        // 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
                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;
        }
    }

    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();
        }
    }
}

希望这会有所帮助.

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