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，因为系统在该位置附近运行良好。

清单中的

我已经获得了此权限设置

<select id="selectMonth">
    {{#each month in allMonths}}
        {{#if currentMonth === month}}
            <option selected="selected" value='{{_view.contentIndex}}'>{{month}}</option>   
        {{else}}
            <option value='{{_view.contentIndex}}'>{{month}}</option>
        {{/if}}
    {{/each}}
</select>

并且在mainactivity.java中我得到了这个

<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>

我不知道是什么遗漏使其工作可能总是出现问问权限或其他事情。需要大帮助。谢谢。我搜索了一些关于启用权限的模板，但是遇到了很多错误。

Answer 1

首先，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>

<强> main.xml中

<?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();
        }
    }
}

希望这有帮助。

Answer 2

    private boolean isLocationPermissionGrandted() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            return ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                    || ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED
                    || ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_BACKGROUND_LOCATION) == PackageManager.PERMISSION_GRANTED;
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            return ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                    || ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED;
        } else {
            return true;
        }
    }


    private void getLocationPermission() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_BACKGROUND_LOCATION}, PERMISSION_LOCATTION_CODE);
        } else {
            ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_LOCATTION_CODE);
        }
    }

if (isLocationPermissionGrandted())
     initializeWebView();
else
     getLocationPermission();

在Webview上启用GeoLocation

2 个答案: