Android在WebView活动中向左/向右滑动手势(单击链接和垂直滚动)

问题描述

已解决，解决方案在下面.

SOLVED, solution is underneath.

我想将Webview中用于导航的按钮替换为2种滑动手势-左右滑动.此 Android:如何处理从右向左的滑动手势链接确实对我有所帮助，但是我遇到了问题-实施此代码后，我无法单击链接/或在webview活动中滚动浏览已加载的网页(我从可能的答案中使用了第一个答案).

I want to replace buttons for navigation in webview to 2 swipe gestures - left and right swipe. This Android: How to handle right to left swipe gestures link really helped me, but I encountered problem - after implementing this code I was unable to click on links/ or scroll through loaded webpage in webview activity(I have used 1st answer from possible answers).

然后，我发现该问题的另一个答案是类似的-如何在列表视图中滚动- https://stackoverflow. com/a/20005481/3272449 ，但我无法使其运行.在logcat中，我得到以下调试信息: http://s27.postimg.org/5qfipgi1v/message.png

Then I found out that in another answer in this question is something similar - how to scroll in listview - https://stackoverflow.com/a/20005481/3272449, but I wasn't able to get it running. In logcat i get this debug info:http://s27.postimg.org/5qfipgi1v/message.png

这是我的OnSwipeTouchListener:

This is my OnSwipeTouchListener:

import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class OnSwipeTouchListener implements OnTouchListener {

private final GestureDetector gestureDetector = new GestureDetector(new GestureListener());

public boolean onTouch(final View view, final MotionEvent motionEvent) {
    return gestureDetector.onTouchEvent(motionEvent);
}

private final class GestureListener extends SimpleOnGestureListener {

    private static final int SWIPE_THRESHOLD = 100;
    private static final int SWIPE_VELOCITY_THRESHOLD = 100;

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }

    @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)) {
                if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffX > 0) {
                        onSwipeRight();
                    } else {
                        onSwipeLeft();
                    }
                }
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return result;
    }
}

public void onSwipeRight() {
}

public void onSwipeLeft() {
}

public GestureDetector getGestureDetector(){
    return  gestureDetector;
}
}

我的网络视图活动(已删除):

And my webview activity(stripped):

public class WebViewActivity extends Activity {
private WebView browser;
    private OnSwipeTouchListener onSwipeTouchListener;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.webview);
            onSwipeTouchListener = new OnSwipeTouchListener() {
public void onSwipeRight() {
    Toast.makeText(WebViewActivity.this, "right", Toast.LENGTH_SHORT).show();
}
public void onSwipeLeft() {
    Toast.makeText(WebViewActivity.this, "left", Toast.LENGTH_SHORT).show();
}
};

browser.setOnTouchListener(onSwipeTouchListener);
} // end of onCreate
@Override
public boolean dispatchTouchEvent(MotionEvent ev){
    onSwipeTouchListener.getGestureDetector().onTouchEvent(ev);
        return super.dispatchTouchEvent(ev);
}
} // end of WebViewActivity

如何使左右滑动，垂直滚动和单击链接同时起作用?

How to make left/right swiping, vertical scrolling and clicking on links working at the same time?

解决方案:同样解决的问题: 在Android中滑动手势和Webview

SOLUTION: Same solved question: Fling Gesture and Webview in Android

推荐答案

我对GestureDetector不够熟悉，无法可靠地诊断您的问题.您可以尝试的一件事是克隆事件:

I'm not familiar enough with the GestureDetector to reliably diagnose your problem. One thing you could try is cloning the event:

@Override
public boolean dispatchTouchEvent(MotionEvent ev){
    onSwipeTouchListener.getGestureDetector().onTouchEvent(MotionEvent.obtain(ev));
    return super.dispatchTouchEvent(ev);
}

解决此问题的另一种方法是使用 onOverScrolled 而不是GestureDetector:

Failing that another way to approach this is to use onOverScrolled instead of a GestureDetector:

@Override
protected void onOverScrolled (int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
    if (scrollX > (getWidth() + THRESHOLD) && clampedX) {
        onSwipeLeft();
    }
    if (scrollX < - THRESHOLD && clampedX) {
        onSwipeRight();
    }
    super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);
}

这确实假定您的内容通常无法横向滚动.

This does assume that your content is not normally scrollable sideways though.

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