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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
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_ASSISTED_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
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.
*
* <p>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.</p>
*
* @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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