Question

我要做的是将POST消息的响应显示在我的webview中加载的HTML上。但是，我的webview显示为空白。我可以通过将其打印出来在LogCat中看到响应消息。但是，我的webview再次显示为空白。 Example.html是我在网页浏览中加载的页面。我的实现如下：

HttpPostID.java - 向服务器发送POST消息的类

public class HttpPostID extends AsyncTask<Void,Integer,Void> {

    public static String result;

    private static final String webphp = "http://..../queryRestaurantsList.php";

    String IDs;

    HttpPostID(String ids){
        this.IDs =ids;
    }

    @Override
    protected Void doInBackground(Void... params){

        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(webphp);

        try {

            String hello="111,222,333";

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            nameValuePairs.add(new BasicNameValuePair("order",IDs));
            nameValuePairs.add(new BasicNameValuePair("hello",hello));

            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            HttpResponse response = httpclient.execute(httppost);
            HttpEntity resEntity = response.getEntity();

            result = EntityUtils.toString(resEntity);

            //System.out.println(result);


        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

    @Override
    protected void onPostExecute(Void v){
        System.out.println(result);
        Restaurant_view.myWebView.loadUrl("javascript:loadData('"+result+"')");

    }
}

MainActivity.java

public static WebView myWebView;

protected void onCreate(Bundle savedInstanceState) {

    myWebView = (WebView) findViewById(R.id.webView3);
    WebSettings webSettings = myWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setDomStorageEnabled(true);
    myWebView.addJavascriptInterface(this,"Android");

    myWebView.loadUrl(webaddress);

    new HttpPostID(tester).execute();
   }

example.html的

<head>
<script>
function loadData(str){
        var c = document.getElementById("rest_mesgs");
        c.innerHTML = "";
        c.innerHTML = str;
        }
</script>
</head>
<body style="background-color : #e9e9e9;">
<div id="rest_mesgs">
</div>
</body>

服务器上的

.php文件

mysql_connect($host,$username,$password);
mysql_select_db($database) or die( "Unable to select database");

//Check if POST array is empty or not
$order = $_POST['order'];

if ($order != null){

$query = "SELECT RestaurantID,Name,Short_Loc,Image_Link,Full_Link,Type FROM Restaurant_Info
          ORDER BY FIND_IN_SET(RestaurantID,'".$order."')";

$result = mysql_query($query) or die( "Unable to execute query");


while ($row = mysql_fetch_array($result)){
        print '<li id="'.$row['RestaurantID'].'" onclick="newAct('.$row['RestaurantID'].')">';  
        print '<a href="'.$row['Full_Link'].'">';
        print '<img style="height:80px;" src="'.$row['Image_Link'].'">';
        print '<h2 style="text-wrap : normal" >'.$row['Name'].'</h2>';
        print '<p id="type" class="ui-li-aside"><strong>'.$row['Type'].'</strong></p>';
        print '<p>'.$row['Short_Loc'].'</p>';
        print '</a>';
        print '</li>';
        }
}
else {
    echo "Waiting for POST";
}

从Android调用webview中的javascript函数

0 个答案: