单击Html按钮可在Android中移动另一个活动_Android_Android Webview

单击Html按钮可在Android中移动另一个活动

android

单击Html按钮可在Android中移动另一个活动,android,android-webview,Android,Android Webview,我在added interface@android.webkit.JavascriptInterface中没有得到任何方法。它们在Api级别17中不可见。addJavascriptInterface方法的编译错误我已经指出了下面代码中的错误行：网络视图代码： import android.webkit.JavascriptInterface; webView = (WebView) findViewById(R.id.load_url); webView.getSettings().set

我在added interface@android.webkit.JavascriptInterface中没有得到

任何方法。它们在Api级别17中不可见。

addJavascriptInterface方法的编译错误

我已经指出了下面代码中的错误行：

网络视图代码：

import android.webkit.JavascriptInterface;

webView = (WebView) findViewById(R.id.load_url);
webView.getSettings().setJavaScriptEnabled(true);

 if (new File(url).exists()) {
            webView.loadUrl(FILENAME_PREFIX + url);
            Log.d("fileurl", "" + FILENAME_PREFIX + url);

        }

        webView.addJavascriptInterface(new Object() { --->None of the methods in the added interface @android.webkit.JavascriptInterface.They will not be visible in Api level 17.

            @JavascriptInterface
            public void performClick() {
                Intent intRef=new Intent(FirstActivity.this,SecondActivity.class);
                startActivity(intRef);
            }
        }, "ok");

<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" type="text/css" href="style.css" />
    </head>
    <body>

         <div>
            <button type="button" onclick="ok.performClick();">OK</button>
        </div>
  </body>
</html>

<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" type="text/css" href="style.css" />

        <script type="text/javascript">

        function moveToScreenTwo() {
        Android.moveToNextScreen();
        }
        </script>

    </head>

  <body>
     <div>
            <input type="button" value="Locate" onClick="moveToScreenTwo()" />
        </div>
  </body>
  </html>

import android.webkit.JavascriptInterface;

webView = (WebView) findViewById(R.id.load_url);
webView.getSettings().setJavaScriptEnabled(true);

 if (new File(url).exists()) {
            webView.loadUrl(FILENAME_PREFIX + url);
            Log.d("fileurl", "" + FILENAME_PREFIX + url);
  webView.addJavascriptInterface(new WebAppInterface(this), "Android");
        }
  //Class to be injected in Web page
    public class WebAppInterface {
        Context mContext;

        /**
         * Instantiate the interface and set the context
         */
        WebAppInterface(Context c) {
            mContext = c;
        }

        @JavascriptInterface
        public void moveToNextScreen() {

            Intent i = new Intent(FirstActivity.this,SecondActivity.class);
            startActivity(i);

        }
     }

Html代码：

import android.webkit.JavascriptInterface;

webView = (WebView) findViewById(R.id.load_url);
webView.getSettings().setJavaScriptEnabled(true);

 if (new File(url).exists()) {
            webView.loadUrl(FILENAME_PREFIX + url);
            Log.d("fileurl", "" + FILENAME_PREFIX + url);

        }

        webView.addJavascriptInterface(new Object() { --->None of the methods in the added interface @android.webkit.JavascriptInterface.They will not be visible in Api level 17.

            @JavascriptInterface
            public void performClick() {
                Intent intRef=new Intent(FirstActivity.this,SecondActivity.class);
                startActivity(intRef);
            }
        }, "ok");

<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" type="text/css" href="style.css" />
    </head>
    <body>

         <div>
            <button type="button" onclick="ok.performClick();">OK</button>
        </div>
  </body>
</html>

<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" type="text/css" href="style.css" />

        <script type="text/javascript">

        function moveToScreenTwo() {
        Android.moveToNextScreen();
        }
        </script>

    </head>

  <body>
     <div>
            <input type="button" value="Locate" onClick="moveToScreenTwo()" />
        </div>
  </body>
  </html>

import android.webkit.JavascriptInterface;

webView = (WebView) findViewById(R.id.load_url);
webView.getSettings().setJavaScriptEnabled(true);

 if (new File(url).exists()) {
            webView.loadUrl(FILENAME_PREFIX + url);
            Log.d("fileurl", "" + FILENAME_PREFIX + url);
  webView.addJavascriptInterface(new WebAppInterface(this), "Android");
        }
  //Class to be injected in Web page
    public class WebAppInterface {
        Context mContext;

        /**
         * Instantiate the interface and set the context
         */
        WebAppInterface(Context c) {
            mContext = c;
        }

        @JavascriptInterface
        public void moveToNextScreen() {

            Intent i = new Intent(FirstActivity.this,SecondActivity.class);
            startActivity(i);

        }
     }


好啊

我使用的是MinsdkVersion11和TargetSDkVersion22。我在before方法中调用了@JavascriptInterface。您可以在上面的代码中看到这一点

任何人都可以帮我。谢谢。

来自Android 4.2文档：

警告：如果您已将targetSdkVersion设置为17或更高，则必须将@JavascriptInterface注释添加到您选择的任何方法中希望您的网页代码可用（该方法也必须是公共的）。如果如果不提供注释，则无法访问该方法在Android 4.2或更高版本上运行时，通过您的网页

您必须在类中使用@JavascriptInterface注释您希望从Javascript访问的每个方法

编辑： 我在代码中实现了这种方式：

webView.addJavascriptInterface(new WebAppInterface(this), "ok");
public class WebAppInterface {
        Context mContext;

        /** Instantiate the interface and set the context */
        WebAppInterface(Context c) {
            mContext = c;
        }

        @JavascriptInterface
        public void performClick() {
            Intent intRef=new Intent(FirstActivity.this,SecondActivity.class);
            startActivity(intRef);
        }
    }

我希望有帮助

Html页面：

import android.webkit.JavascriptInterface;

webView = (WebView) findViewById(R.id.load_url);
webView.getSettings().setJavaScriptEnabled(true);

 if (new File(url).exists()) {
            webView.loadUrl(FILENAME_PREFIX + url);
            Log.d("fileurl", "" + FILENAME_PREFIX + url);

        }

        webView.addJavascriptInterface(new Object() { --->None of the methods in the added interface @android.webkit.JavascriptInterface.They will not be visible in Api level 17.

            @JavascriptInterface
            public void performClick() {
                Intent intRef=new Intent(FirstActivity.this,SecondActivity.class);
                startActivity(intRef);
            }
        }, "ok");

<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" type="text/css" href="style.css" />
    </head>
    <body>

         <div>
            <button type="button" onclick="ok.performClick();">OK</button>
        </div>
  </body>
</html>

<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" type="text/css" href="style.css" />

        <script type="text/javascript">

        function moveToScreenTwo() {
        Android.moveToNextScreen();
        }
        </script>

    </head>

  <body>
     <div>
            <input type="button" value="Locate" onClick="moveToScreenTwo()" />
        </div>
  </body>
  </html>

import android.webkit.JavascriptInterface;

webView = (WebView) findViewById(R.id.load_url);
webView.getSettings().setJavaScriptEnabled(true);

 if (new File(url).exists()) {
            webView.loadUrl(FILENAME_PREFIX + url);
            Log.d("fileurl", "" + FILENAME_PREFIX + url);
  webView.addJavascriptInterface(new WebAppInterface(this), "Android");
        }
  //Class to be injected in Web page
    public class WebAppInterface {
        Context mContext;

        /**
         * Instantiate the interface and set the context
         */
        WebAppInterface(Context c) {
            mContext = c;
        }

        @JavascriptInterface
        public void moveToNextScreen() {

            Intent i = new Intent(FirstActivity.this,SecondActivity.class);
            startActivity(i);

        }
     }

更多参考：检查。

参考此-阅读此内容，它只适用于我指出的一种方法。