CODEWITHSUNDEEP
androidwebview
Sadananda
Sadananda

Reputation: 35

webview javascript interface to update Autocompletetextview

I'm a beginner of Android and new to Stackoverflow. So excuse me for my silly question. However I found no solved solution here, so posting it as a new question.

I've an activity with an Autocompletetextview and a webview. I want on clicking a hyperlink in webview to fill some text in Autocompletetextview. So I've called Javascript in the webpage which in-turn calls Javascript AppInterface. In interface function, I want to update Autocompletetextview text.

I'm able to collect the text from javascript. But while setting the text of Autocompletetextview, my application is crashing.

WebAppInterface.java

public class JsInterface {
 @JavascriptInterface
 public void NewText(final String text)
{
Log.d("New_Text", "" + text); //Works fine till here.
((Activity)mContext).findViewById(R.id.autoCompleteTextView);
Handler mHandler = new Handler();
mHandler.post(new Runnable() {
    @Override
    public void run() {
        AutoCompleteTextView SearchTextbox = (AutoCompleteTextView) ((Activity)mContext).findViewById(R.id.autoCompleteTextView);
        SearchTextbox.setText(text);
    }
   });
 }
}

Error on App Crash

E/AndroidRuntime: FATAL EXCEPTION: JavaBridge
 Process: com.test.xxx, PID: 22102
 java.lang.ClassCastException: android.app.Application cannot be cast to android.app.Activity
 at com.test.xxx.WebAppInterface$1.run(WebAppInterface.java:102)
 at android.os.Handler.handleCallback(Handler.java:733)
 at android.os.Handler.dispatchMessage(Handler.java:95)
 at android.os.Looper.loop(Looper.java:136)
 at android.os.HandlerThread.run(HandlerThread.java:61)

I want to know if my approach to update UI component is correct? If yes, what changes will resolve the error and will work fine.

Upvotes: 1

Views: 331

Answers (2)

frogatto
frogatto

Reputation: 29285

The line

java.lang.ClassCastException: android.app.Application cannot be cast to android.app.Activity

is self-explanatory enough. You're casting mContext to Activity while it's not an instance of Activity class.

You can add a method called setAutoCompleteTextView to your JsInterface class, in which you can hold a reference to that auto complete text view.

public void setAutoCompleteTextView(AutoCompleteTextView textview){
    this.mTextView = textview;
}

And in the JavaScript interface method, use it like this.mTextView.set...().

Upvotes: 1

csenga
csenga

Reputation: 4114

The key point is this:

java.lang.ClassCastException: android.app.Application cannot be cast to android.app.Activity

This means your mContext varible at the problematic line is an Application object not an Activity, so refer to the Activity where you assign it not to the Application.

Upvotes: 0

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