调用javascript函数时未定义

我可以将数据从我的android传递给javascript。但问题是，当我调用函数setValue（）时，它变成了Undefined，但是当它加载时它传递了正确的值。以下是我的代码。调用javascript函数时未定义

这里是我的Java类代码

public class PaymentActivity extends Activity { 

String amount1; 


    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.payment); 

     Bundle extras = getIntent().getExtras(); 
      if(extras !=null) 
      { 
       amount1 = extras.getString("amount1"); 

      } 

     WebView web = (WebView) findViewById(R.id.web1); 
     web.getSettings().setJavaScriptEnabled(true); 
     web.loadUrl("javascript:window.onload = function(){setValue(\""+ amount1 +"\");};"); 
     web.loadUrl("file:///android_asset/www/index.html"); 


    } 

}

，这里是我的网页代码

<!DOCTYPE html> 
<html> 
<head> 
</head> 
<body> 

    Whats your Name? 
    <input id="name" value="" /> 
    <input id="pass" value="" /> 
    <button onclick = "setValue()">Submit</button> 

<script type="text/javascript"> 
    function setValue(amount1){ 
    myValue = amount1; 
    document.getElementById("pass").value = myValue; 

    } 
</script> 

</body> 
</html>

来源

2012-08-03 user1570222

你不能直接从活动上装载调用Java脚本函数。您需要使用处理程序和线程以及隐藏按钮

public class AskUsActivity extends Activity{ 
private Button scriptButton; 
private WebView webView; 
private Handler handler;; 

MyJavaScriptInterface myJavaScriptInterface; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.ask_us); 

    webView = (WebView)findViewById(R.id.askUs_webView); 
    scriptButton=(Button)findViewById(R.id.scriptButton); 

    loadData(); 

    myJavaScriptInterface = new MyJavaScriptInterface(this); 

    webView.loadUrl("file:///android_asset/AskUs.htm"); 

    webView.addJavascriptInterface(myJavaScriptInterface, "AndroidFunction"); 

    webView.getSettings().setJavaScriptEnabled(true); 

    webView.setWebChromeClient(new WebChromeClient()); 

    handler=new Handler(){ 
     @Override 
     public void handleMessage(Message msg) { 
      System.out.println("inside handler"); 
      scriptButton.performClick(); 
     } 
    }; 

    scriptButton.setOnClickListener(new Button.OnClickListener(){ 

     @Override 
     public void onClick(View arg0) { 
      webView.loadUrl("javascript:setcontactInfo('1|*|nikhil|||');"); 
     } 
    }); 

    //  String selectedImagePath="1|*|nikhil|||"; 

    //  webView.loadUrl("javascript:setInternational()"); 

    //  new Thread(){ 
    //   @Override 
    //   public void run() { 
    //    System.out.println("inside thread.................Start......."); 
    //    webView.loadUrl("javascript:setcontactInfo('1|*|nikhil|||');"); 
    //    System.out.println("inside thread.................end......."); 
    //   } 
    //  }.start(); 

} 

@Override 
protected void onResume() { 
    super.onResume(); 
    try { 
     Thread.sleep(400); 
    } catch (InterruptedException e) { 
     e.printStackTrace(); 
    } 
    new Thread(){ 
     public void run() { 
      System.out.println("inside thread................"); 
      handler.sendEmptyMessage(0); 
     }; 
    }.start(); 
} 


private void loadData(){ 
    try { 

     String destPath = "/data/data/" + getPackageName()+ "/databases/kellypipe.sqlite"; 

     File f = new File(destPath); 
     if(!f.exists()){ 
      Log.v("<<<TAG>>>","File Not Exist"); 
      InputStream in = getAssets().open("kellypipe.sqlite"); 
      OutputStream out = new FileOutputStream(destPath); 

      byte[] buffer = new byte[1024]; 
      int length; 
      while ((length = in.read(buffer)) > 0) { 
       out.write(buffer, 0, length); 
      } 
      in.close(); 
      out.close(); 
     } 

    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     Log.v("<<<TAG>>>","ioexeption"); 
     e.printStackTrace(); 
    } 

    DBManager dbManager = new DBManager(this); 
    Log.v("<<<TAG>>>","Database is there with version: "+dbManager.getReadableDatabase().getVersion()); 
    //  String sql = "select * from CasingMetric"; 

    String sql= "SELECT ID,listname,name,address,contact,email from contactInfo order by ID"; 


    SQLiteDatabase db = dbManager.getReadableDatabase(); 
    Cursor cursor = db.rawQuery(sql, null); 
    Log.v("<<<TAG>>>","Query Result:"+cursor); 
    cursor.moveToFirst(); 
    int i=cursor.getColumnIndex("listname"); 
    int j=cursor.getColumnIndex("name"); 

    int x=0; 
    while(!cursor.isAfterLast()){ 
     x++; 
     System.out.println("Listname : "+cursor.getString(i)+ " Name: "+cursor.getString(j)+" :: X is : "+x); 
     cursor.moveToNext(); 
    } 

    cursor.close(); 
    db.close(); 
    dbManager.close(); 
} 

public class MyJavaScriptInterface { 
    Context mContext; 

    MyJavaScriptInterface(Context c) { 
     mContext = c; 
    } 

    public void showToast(String toast){ 
     //Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show(); 
     webView.loadUrl("javascript:callFromActivity()"); 
    } 

    public void openAndroidDialog(){ 
     AlertDialog.Builder myDialog = new AlertDialog.Builder(AskUsActivity.this); 
     myDialog.setTitle("DANGER!"); 
     myDialog.setMessage("You can do what you want!"); 
     myDialog.setPositiveButton("ON", null); 
     myDialog.show(); 
    } 
} 

}

来源

2012-08-03 07:43:55 user853266

调用javascript函数时未定义

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