Android，Tabhost 中带有 GestureDetector 的 ViewFlipper

Question

我想创建一个 tabhost 并且我想在一项 Activity 中添加一个 viewflipper。此 Activity 适用于 tabhost。我写了，但什么不起作用。有谁知道我该怎么做？我希望他们明白我想要什么。

我想在这个 Activity 中使用 GestureDetector。我可以用按钮更改图片，但不能用手指。

Answer 1

我以前做过。 ( https://github.com/vancexu/AimTo/tree/master/src/com/hackingtrace/vancexu AimToActivity.java)
只需实现您自己的 GestureDetector ，然后在您的选项卡 Activity 中注册一个 OnTouchListener

对了，我也实现了幻灯片动画，使用TabHost中的ViewFlipper

我的 TabHostActivity 中的一些代码

private static final int SWIPE_MIN_DISTANCE = 180; 
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;

public void onCreate(Bundle savedInstanceState) {
    ....
    gestureDetector = new GestureDetector(new MyGestureDetector());

    gestureListener = new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            if (gestureDetector.onTouchEvent(event)) {
                return true;
            }
            return false;
        }
    };

class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        TabHost tabHost = getTabHost();
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            // right to left swipe, tab change to right
            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Log.i("Gesture ", "right");
                if (currentView == maxTabIndex) {
                    currentView = 0;
                } else {
                    currentView++;
                }
                viewFlipperBody.setInAnimation(slideLeftIn);
                viewFlipperBody.setOutAnimation(slideLeftOut);
                viewFlipperBody.setDisplayedChild(currentView);

            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                Log.i("Gesture ", "left");
                if (currentView == 0) {
                    currentView = maxTabIndex;
                } else {
                    currentView--;
                }
                viewFlipperBody.setInAnimation(slideRightIn);
                viewFlipperBody.setOutAnimation(slideRightOut);
                viewFlipperBody.setDisplayedChild(currentView);
            }
        } catch (Exception e) {
            // nothing
            e.printStackTrace();
        }
        tabHost.setCurrentTab(currentView);
        return false;
    }
}

@Override
public boolean dispatchTouchEvent(MotionEvent event) {

    if (gestureDetector.onTouchEvent(event)) {
        event.setAction(MotionEvent.ACTION_CANCEL);
    }
    return super.dispatchTouchEvent(event);
}