Fling Gesture and Webview in Android

Asked 2010-11-19T20:40:10.217

I have a webview control that needs to support the fling gesture in Android in order to bring up a new record (load new data). This is occuring in a class that extends Activity. All the examples I've seen show how to implement gesture support for a textview, but nothing for webview.

I need to execute different actions for both left and right flings. Any code help would be appreciated as this totally has me stumped.

Here's my basic onCreate and my class

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.os.Bundle;
import android.text.Html;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;

import android.webkit.WebView;

public class ArticleActivity extends Activity   {

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);



    Window  w = getWindow();

     w.requestFeature(Window.FEATURE_LEFT_ICON);

     WebView webview = new WebView(this);
     setContentView(webview); 



     w.setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
     R.drawable.gq);




    setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);
    populateFields();
    webview.loadData(question + answer, "text/html", "utf-8");



  //   
}
private void populateFields() {

....


}

}

Edit Report

2 Answers

Create a GestureListener and a GestureDetector. Call the GestureDetector.onTouchEvent by overriding the webview's onTouchEvent.

You can also just override the Activity onTouchEvent btw. I can post some code if you need.

Edit: Code as requested.

public class Main extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        MyWebView webview = new MyWebView(this);
        setContentView(webview);
    }

    class MyWebView extends WebView {
        Context context;
        GestureDetector gd;

        public MyWebView(Context context) {
            super(context);

            this.context = context;
            gd = new GestureDetector(context, sogl);
        }

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            return gd.onTouchEvent(event);
        }

        GestureDetector.SimpleOnGestureListener sogl = new GestureDetector.SimpleOnGestureListener() {
            public boolean onDown(MotionEvent event) {
                return true;
            }

            public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) {
                if (event1.getRawX() > event2.getRawX()) {
                    show_toast("swipe left");
                } else {
                    show_toast("swipe right");
                }
                return true;
            }
        };

        void show_toast(final String text) {
            Toast t = Toast.makeText(context, text, Toast.LENGTH_SHORT);
            t.show();
        }
    }
}

@littleFluffyKitty. I presume by default WebView touch events you mean when it brings up the zoom controls etc? I didn't test that. I have found that implementing ones own gesture detection works best (not sure if it would work best on a WebView though). You need to look at a touch e

answered 2010-11-19T21:09:04.933

@Han, forgive @techiServices his uncalled-for answer.

The problem with the code above is that in all cases it returns true for onFling and onDown. What you want instead is to return false for the events that you don't handle, or for conditions in those events that you don't handle. Or indeed, in onTouchEvent you could pass the call to the base class by returning

super.onTouchEvent(event);

answered 2011-05-26T02:18:56.737

Fling Gesture and Webview in Android

2 Answers

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