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公司项目混合应用，h5界面用了百度定位，在手机系统浏览器上会弹出定位权限请求框，但在app的webview上就没响应，查看资料，发现还需要实现WebChromeClient类的onGeolocationPermissionsShowPrompt方法，步骤如下：

1、定位权限申明

2、WebView相关设置

mWebView.getSettings().setGeolocationEnabled(true);    private WebChromeClient mWebChromeClient = new WebChromeClient() {        @Override        public void onGeolocationPermissionsShowPrompt(final String origin, final GeolocationPermissions.Callback callback) {            callback.invoke(origin, true, true);        }    };    mWebView.setWebChromeClient(mWebChromeClient);

这样完了之后有可能onGeolocationPermissionsShowPrompt不会被调用到，看这段源码说明：

/** * Notify the host application that web content from the specified origin * is attempting to use the Geolocation API, but no permission state is * currently set for that origin. The host application should invoke the * specified callback with the desired permission state. See * {@link GeolocationPermissions} for details. * * 
Note that for applications targeting Android N and later SDKs * (API level > {@link android.os.Build.VERSION_CODES#M}) * this method is only called for requests originating from secure * origins such as https. On non-secure origins geolocation requests * are automatically denied.
 * * @param origin The origin of the web content attempting to use the *               Geolocation API. * @param callback The callback to use to set the permission state for the *                 origin. */public void onGeolocationPermissionsShowPrompt(String origin,        GeolocationPermissions.Callback callback) {}

意思是，如果targetSdkVersion设置为21以上，同时如果h5不是https开头，该方法会自动拒绝执行。解决办法是把targetSdkVersion设置为21就可以了。

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