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Android:上下拖动切换界面_viewdraghelper 上下切换

viewdraghelper 上下切换
import android.content.Context;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewCompat;
import android.support.v4.widget.ViewDragHelper;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;

/**
 * 用于上下拖动切换界面的控件, 只允许两个子view
 */
public class VerticalSlideLayout extends ViewGroup {
    private static final int THRESHOLD_VEL = 100;
    private static final int THRESHOLD_DISTANCE = 100;
    private ViewDragHelper mDragHelper;
    private PageChangeListener mListener;
    private View mViewOne, mViewTwo;
    private int mViewHeight;
    private int mPageNum;
    private float mOldX, mOldY;

    public VerticalSlideLayout(Context context) {
        this(context, null);
    }

    public VerticalSlideLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public VerticalSlideLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mDragHelper = ViewDragHelper.create(this, 10f, new DragHelperCallback());
        mDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_BOTTOM);
    }

    @Override
    protected void onFinishInflate() {
        mViewOne = getChildAt(0);
        mViewTwo = getChildAt(1);
    }

    @Override
    public void computeScroll() {
        if (mDragHelper.continueSettling(true)) {
            ViewCompat.postInvalidateOnAnimation(this);
        }
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (mViewOne.getBottom() > 0 && mViewOne.getTop() < 0) {
            return false;
        }
        final int action = MotionEventCompat.getActionMasked(ev);
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mOldX = ev.getX();
                mOldY = 
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