android更改滑动视图

时间:2013-02-20 13:11:03

标签: android gesturedetector

当用户滑动包含这些视图的布局时,我正在寻找一种更改TextViews内容的方法。我的目标是这样的: enter image description here

我正在尝试使用SimpleOnGestureListener执行此操作(代码如下)。问题:当我从左向右滑动时,i的值变为-1,并且后续滑动不会发生反应。从右到左滑动会导致i变为1(地狱为零?)并且View会再次停止对滑动的反应。我做错了什么?

     public class MainActivity extends Activity {
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;
public View mainview;
public TextView lol;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    gestureDetector = new GestureDetector(new MyGestureDetector());
    mainview = (View) findViewById(R.id.mainView);
    lol = (TextView) findViewById(R.id.textView2);

    mainview.setOnTouchListener(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) {
        int i = 0;

        if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) {
            return false;
        }

        if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
            i++;
            lol.setText("Text" + " " + Integer.toString(i));

            return true;
        } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
            i--;
            lol.setText("Text" + " " + Integer.toString(i));

            return true;
        }

        return false;
    }

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

2 个答案:

答案 0 :(得分:2)

为什么不使用viewPager?它完全符合您的需求并支持指标。有一些带有指示器的自定义库,您可以在其中找到所需的确切指示器,例如: this one is nice

答案 1 :(得分:1)

使用图库或水平ScrollView或ViewPager

而不是管理手势