Enable GeoLocation On Webview

问题

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

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>

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());
}}

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.

回答1:

First, the Android manifest:

<?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>

main.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" />

And finally, here is the complete app, consisting only of 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();
        }
    }
}

Hope this helps.

来源：https://stackoverflow.com/questions/48661081/enable-geolocation-on-webview