android的Javascript接口不工作

我正在尝试从Android向JavaScript传递变量。单击映射按钮时，它将使用以下

onCreate

方法打开此类：

@SuppressLint("JavascriptInterface")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.maps);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    myWebView = (WebView) findViewById(R.id.webview);
    setMyWebviewSettings(myWebView.getSettings());

    myWebView.setWebViewClient(new WebViewClient());
    myWebView.setWebChromeClient(new WebChromeClient());

    Bundle extras = getIntent().getExtras();
    double[] coordinates = setCoordinates(extras);

    myWebView.addJavascriptInterface(new JavaScriptInterface(coordinates), "JSInterface");

    myWebView.loadUrl("http://10.0.0.32:8887/services/maps/examples/basic-example.htm");
}

private void setMyWebviewSettings(WebSettings MyWebviewSettings){
    MyWebviewSettings.setAllowFileAccessFromFileURLs(true);
    MyWebviewSettings.setAllowUniversalAccessFromFileURLs(true);
    MyWebviewSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    MyWebviewSettings.setJavaScriptEnabled(true);
    MyWebviewSettings.setDomStorageEnabled(true);
    MyWebviewSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    MyWebviewSettings.setBuiltInZoomControls(true);
    MyWebviewSettings.setAllowFileAccess(true);
    MyWebviewSettings.setSupportZoom(true);
}

private double[] setCoordinates(Bundle extras) {

    double[] coordinates = new double[3];

    coordinates[0] = 45.9049;
    coordinates[1] = 13.3177;
    coordinates[2] = 15;

    if (extras != null) {
        coordinates[0] = extras.getDouble("lat");
        coordinates[1] = extras.getDouble("lon");
        coordinates[2] = extras.getDouble("pan");
    }
    return coordinates;
}

以下是

setMyWebviewSettings

方法：

@SuppressLint("JavascriptInterface")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.maps);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    myWebView = (WebView) findViewById(R.id.webview);
    setMyWebviewSettings(myWebView.getSettings());

    myWebView.setWebViewClient(new WebViewClient());
    myWebView.setWebChromeClient(new WebChromeClient());

    Bundle extras = getIntent().getExtras();
    double[] coordinates = setCoordinates(extras);

    myWebView.addJavascriptInterface(new JavaScriptInterface(coordinates), "JSInterface");

    myWebView.loadUrl("http://10.0.0.32:8887/services/maps/examples/basic-example.htm");
}

private void setMyWebviewSettings(WebSettings MyWebviewSettings){
    MyWebviewSettings.setAllowFileAccessFromFileURLs(true);
    MyWebviewSettings.setAllowUniversalAccessFromFileURLs(true);
    MyWebviewSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    MyWebviewSettings.setJavaScriptEnabled(true);
    MyWebviewSettings.setDomStorageEnabled(true);
    MyWebviewSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    MyWebviewSettings.setBuiltInZoomControls(true);
    MyWebviewSettings.setAllowFileAccess(true);
    MyWebviewSettings.setSupportZoom(true);
}

private double[] setCoordinates(Bundle extras) {

    double[] coordinates = new double[3];

    coordinates[0] = 45.9049;
    coordinates[1] = 13.3177;
    coordinates[2] = 15;

    if (extras != null) {
        coordinates[0] = extras.getDouble("lat");
        coordinates[1] = extras.getDouble("lon");
        coordinates[2] = extras.getDouble("pan");
    }
    return coordinates;
}

下面是

JavaScriptInterface

：

public class JavaScriptInterface {

    double lat;
    double lon;
    double pan;

    JavaScriptInterface(double[] coordinate) {
        this.lat = coordinate[0];
        this.lon = coordinate[1];
        this.pan = coordinate[2];
    }

    public double getLatValue() {
        return lat;
    }

    public double getLonValue() {
        return lon;
    }

    public double getPanValue() {
        return pan;
    }
}

以下是设置坐标的方法：

@SuppressLint("JavascriptInterface")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.maps);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    myWebView = (WebView) findViewById(R.id.webview);
    setMyWebviewSettings(myWebView.getSettings());

    myWebView.setWebViewClient(new WebViewClient());
    myWebView.setWebChromeClient(new WebChromeClient());

    Bundle extras = getIntent().getExtras();
    double[] coordinates = setCoordinates(extras);

    myWebView.addJavascriptInterface(new JavaScriptInterface(coordinates), "JSInterface");

    myWebView.loadUrl("http://10.0.0.32:8887/services/maps/examples/basic-example.htm");
}

private void setMyWebviewSettings(WebSettings MyWebviewSettings){
    MyWebviewSettings.setAllowFileAccessFromFileURLs(true);
    MyWebviewSettings.setAllowUniversalAccessFromFileURLs(true);
    MyWebviewSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    MyWebviewSettings.setJavaScriptEnabled(true);
    MyWebviewSettings.setDomStorageEnabled(true);
    MyWebviewSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    MyWebviewSettings.setBuiltInZoomControls(true);
    MyWebviewSettings.setAllowFileAccess(true);
    MyWebviewSettings.setSupportZoom(true);
}

private double[] setCoordinates(Bundle extras) {

    double[] coordinates = new double[3];

    coordinates[0] = 45.9049;
    coordinates[1] = 13.3177;
    coordinates[2] = 15;

    if (extras != null) {
        coordinates[0] = extras.getDouble("lat");
        coordinates[1] = extras.getDouble("lon");
        coordinates[2] = extras.getDouble("pan");
    }
    return coordinates;
}

除了不加载地图外，其他一切都正常。

Bundle extras

为

Null

。如何修复此问题？

因此，我认为您可能缺少了

@JavascriptInterface

注释：

public class JavaScriptInterface {
   @JavascriptInterface
   public double getLatValue() {
      return lat;
   }

   @JavascriptInterface
   public double getLonValue() {
      return lon;
   }

   @JavascriptInterface
   public double getPanValue() {
      return pan;
   }
}

因此，我认为您可能缺少了

@JavascriptInterface

注释：

public class JavaScriptInterface {
   @JavascriptInterface
   public double getLatValue() {
      return lat;
   }

   @JavascriptInterface
   public double getLonValue() {
      return lon;
   }

   @JavascriptInterface
   public double getPanValue() {
      return pan;
   }
}

---

确保在创建启动第二个活动的意图时传递值。如果bundle为null，则表示它们不包含在intent中。

确保在创建启动第二个活动的intent时传递了值。如果bundle为null，则表示它们不包含在intent中。

是的，我发现传递的是一个空bundle。谢谢，我发现我正在传递一个空包裹。谢谢，虽然这不是答案，但帮助很大。谢谢，虽然这不是答案，但帮助很大。谢谢