Android：上下拖动切换界面

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 = ev.getY();                break;            case MotionEvent.ACTION_MOVE:                float adx = Math.abs(ev.getX() - mOldX);                float ady = Math.abs(ev.getY() - mOldY);                if (ady < adx) {                    mDragHelper.cancel();                    return false;                }                break;            case MotionEvent.ACTION_UP:            case MotionEvent.ACTION_CANCEL:                mDragHelper.cancel();                return false;        }        return mDragHelper.shouldInterceptTouchEvent(ev);    }    @Override    public boolean onTouchEvent(MotionEvent e) {        mDragHelper.processTouchEvent(e);        return true;    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        if (mViewOne.getTop() == 0) {            mViewOne.layout(l, 0, r, b - t);            mViewTwo.layout(l, 0, r, b - t);            mViewHeight = mViewOne.getMeasuredHeight();            mViewTwo.offsetTopAndBottom(mViewHeight);        } else {            mViewOne.layout(l, mViewOne.getTop(), r, mViewOne.getBottom());            mViewTwo.layout(l, mViewTwo.getTop(), r, mViewTwo.getBottom());        }    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        measureChildren(widthMeasureSpec, heightMeasureSpec);        int maxWidth = MeasureSpec.getSize(widthMeasureSpec);        int maxHeight = MeasureSpec.getSize(heightMeasureSpec);        setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, 0), resolveSizeAndState(maxHeight, heightMeasureSpec, 0));    }    public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) {        int result = size;        int specMode = MeasureSpec.getMode(measureSpec);        int specSize = MeasureSpec.getSize(measureSpec);        switch (specMode) {            case MeasureSpec.UNSPECIFIED:                result = size;                break;            case MeasureSpec.AT_MOST:                if (specSize < size) {                    result = specSize | MEASURED_STATE_TOO_SMALL;                } else {                    result = size;                }                break;            case MeasureSpec.EXACTLY:                result = specSize;                break;        }        return result | (childMeasuredState & MEASURED_STATE_MASK);    }    private class DragHelperCallback extends ViewDragHelper.Callback {        @Override        public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {            if (changedView == mViewOne) {                mViewTwo.offsetTopAndBottom(dy);            } else {                mViewOne.offsetTopAndBottom(dy);            }            invalidate();        }        @Override        public boolean tryCaptureView(View child, int pointerId) {            return true;        }        @Override        public int getViewVerticalDragRange(View child) {            return 1;        }        @Override        public void onViewReleased(View releasedChild, float xvel, float yvel) {            int finalTop = 0;            if (releasedChild == mViewOne) {                if (yvel < -THRESHOLD_VEL || mViewOne.getTop() < -THRESHOLD_DISTANCE) {                    finalTop = -mViewHeight;                    mPageNum = 1;                    if (null != mListener) {                        mListener.onNextPage();                    }                }            } else {                if (yvel > THRESHOLD_VEL || releasedChild.getTop() > THRESHOLD_DISTANCE) {                    finalTop = mViewHeight;                    mPageNum = 0;                    if (null != mListener) {                        mListener.onPrevPage();                    }                }            }            if (mDragHelper.smoothSlideViewTo(releasedChild, 0, finalTop)) {                ViewCompat.postInvalidateOnAnimation(VerticalSlideLayout.this);            }        }        @Override        public int clampViewPositionVertical(View child, int top, int dy) {            if (child == mViewOne) {                if (top > 0) {                    dy = 0;                }            } else {                if (top < 0) {                    dy = 0;                }            }            return child.getTop() + dy / 3;        }    }    /**     * 由外部Activity的onBackPressed实现, 从第二页面返回第一页面     *     * @return 为false时可调用finish关闭当前Activity     */    public boolean back() {        if (mPageNum == 1) {            if (null != mListener) {                mListener.onPrevPage();            }            if (mDragHelper.smoothSlideViewTo(mViewTwo, 0, mViewHeight)) {                ViewCompat.postInvalidateOnAnimation(VerticalSlideLayout.this);            }            mPageNum = 0;            return true;        }        return false;    }    /**     * 外部实现, 用于处理切换页面后的逻辑     */    public void setPageChangeListener(PageChangeListener listener) {        this.mListener = listener;    }    public interface PageChangeListener {        /**         * 切换到第一页时触发         */        void onPrevPage();        /**         * 切换到第二页时触发         */        void onNextPage();    }}

<com...ui.widget.VerticalSlideLayout    android:id="@+id/slideLl"    android:layout_width="match_parent"    android:layout_height="match_parent">    <FrameLayout        android:id="@+id/one"        android:layout_width="match_parent"        android:layout_height="match_parent"/>    <FrameLayout        android:id="@+id/two"        android:layout_width="match_parent"        android:layout_height="match_parent"/>com...ui.widget.VerticalSlideLayout>

/**

 * 框架 */public class TabActivity extends BaseActivity implements VerticalSlideLayout.PageChangeListener {    private VerticalSlideLayout mSlideLayout;    private OneFragment mOneFrament;    private TwoFragment mTwoFrament;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.match_detail);        initView();    }    private void initView() {        mSlideLayout = (VerticalSlideLayout) findViewById(R.id.slideLl);        mSlideLayout.setPageChangeListener(this);        mOneFrament = new OneFragment();        mTwoFrament = new TwoFragment();        getSupportFragmentManager().beginTransaction().add(R.id.one, mOneFrament).add(R.id.two, mTwoFrament).commit();    }    @Override    public void onPrevPage() {        setTouchMove(true);        mOneFrament.onRefresh();    }    @Override    public void onNextPage() {        setTouchMove(false);        int[] pagePosition = new int[1];        long[] cubeId = new long[1];        mOneFrament.getNextPageParams(pagePosition, cubeId);        mTwoFrament.setParams(pagePosition[0], mMatchId, cubeId[0]);        mTwoFrament.onRefresh();    }    @Override    public void onBackPressed() {        if (!mSlideLayout.back()) {            finish();        }    }}

更多相关文章

随机推荐