如何在Android中滑动Webview页面

时间:2019-03-07 09:18:01

标签: android android-webview swipe

我有一个问题,要触摸“ webView”时使用多页水平方式触摸。如何在我们的项目中实现这一点?请建议我以获得正确的结果。

1 个答案:

答案 0 :(得分:0)

只需将简单的OnTouchListener添加到您的Web视图。单击链接,滚动仍然有效。

只需遵循3个简单步骤:

1-使您的调用对象实现一个简单的TouchListener:

public interface TouchListener  {
    default void onSwipeLeft() {
        Logger.d( "Swipe left default action");  
    }
    default void onSwipeRight() {
        Logger.d( "Swipe right default action");
    }
}

2-在您的调用类中,将以下OnTouchListener添加到您的webView中:

webView.setOnTouchListener( new OnSwipeWebviewTouchListener( getActivity(), this));

使用您的功能实现onSwipeLeft()和onSwipeRight()方法。

3-使用此OnTouchListener:

public class OnSwipeWebviewTouchListener implements View.OnTouchListener {
    private final GestureDetector gestureDetector;
    public OnSwipeWebviewTouchListener(Context ctx, TouchListener touchListener) {
        gestureDetector = new GestureDetector(ctx, new GestureListener(touchListener));
    }
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }
    private final class GestureListener extends GestureDetector.SimpleOnGestureListener {
        private TouchListener touchListener;
        GestureListener(TouchListener touchListener) {
            super();
            this.touchListener = touchListener;
        }
        @Override
        public boolean onDown(MotionEvent e) {
            return false;  // THIS does the trick
        }
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            boolean result = false;
            try {
                float diffY = e2.getY() - e1.getY();
                float diffX = e2.getX() - e1.getX();
                if (Math.abs(diffX) > Math.abs(diffY)) {
                    // You can customize these settings, so 30 is an example
                    if (Math.abs(diffX) > 30 && Math.abs(velocityX) > 30) {
                        if (diffX > 0) {
                            touchListener.onSwipeRight();
                        } else {
                            touchListener.onSwipeLeft();
                        }
                        result = true;
                    }
                } else if (Math.abs(diffY) > userSettings.swipeYDistanceThreshold && Math.abs(velocityY) > userSettings.swipeYSpeedThreshold) {
                    result = false;
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
            return result;
        }
    }
}