侧滑菜单

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Android侧滑
empty                                                                                                                                emptypublic class MainActivity extends Activity {private ListView lv;private ImageView iv_bottom;private ImageView iv_icon;private DragLayout dl;String[] menu = new String[] { "侧滑0", "侧滑1", "侧滑2","侧滑3", "侧滑4", "侧滑5" };@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initMyDragLayout();initView();}private void initMyDragLayout() {dl = (DragLayout) findViewById(R.id.dl);dl.setDragListener(new DragListener() {@Overridepublic void onOpen() {lv.smoothScrollToPosition(new Random().nextInt(30));}@Overridepublic void onClose() {shake();}@Overridepublic void onDrag(float percent) {ViewHelper.setAlpha(iv_icon, 1 - percent);}});}private void initView() {// TODO Auto-generated method stubiv_icon = (ImageView) findViewById(R.id.iv_icon);iv_bottom = (ImageView) findViewById(R.id.iv_bottom);lv = (ListView) findViewById(R.id.lv);lv.setAdapter(new ArrayAdapter(MainActivity.this,R.layout.item_text, menu));lv.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView arg0, View arg1, int position, long arg3) {Toast.makeText(MainActivity.this, menu[position], 0).show();}});iv_icon.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {dl.open();}});}private void shake() {iv_icon.startAnimation(AnimationUtils.loadAnimation(this, R.anim.shake));}}emptyemptypublic class DragLayout extends FrameLayout {    private boolean isShowShadow = true;    private GestureDetectorCompat gestureDetector;    private ViewDragHelper dragHelper;    private DragListener dragListener;    private int range;    private int width;    private int height;    private int mainLeft;    private Context context;    private ImageView iv_shadow;    private RelativeLayout vg_left;    private MyRelativeLayout vg_main;    private Status status = Status.Close;    public DragLayout(Context context) {        this(context, null);    }    public DragLayout(Context context, AttributeSet attrs) {        this(context, attrs, 0);        this.context = context;    }    public DragLayout(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        gestureDetector = new GestureDetectorCompat(context, new YScrollDetector());        dragHelper = ViewDragHelper.create(this, dragHelperCallback);    }    class YScrollDetector extends SimpleOnGestureListener {        @Override        public boolean onScroll(MotionEvent e1, MotionEvent e2, float dx, float dy) {            return Math.abs(dy) <= Math.abs(dx);        }    }    private ViewDragHelper.Callback dragHelperCallback = new ViewDragHelper.Callback() {        @Override        public int clampViewPositionHorizontal(View child, int left, int dx) {            if (mainLeft + dx < 0) {                return 0;            } else if (mainLeft + dx > range) {                return range;            } else {                return left;            }        }        @Override        public boolean tryCaptureView(View child, int pointerId) {            return true;        }        @Override        public int getViewHorizontalDragRange(View child) {            return width;        }        @Override        public void onViewReleased(View releasedChild, float xvel, float yvel) {            super.onViewReleased(releasedChild, xvel, yvel);            if (xvel > 0) {                open();            } else if (xvel < 0) {                close();            } else if (releasedChild == vg_main && mainLeft > range * 0.3) {                open();            } else if (releasedChild == vg_left && mainLeft > range * 0.7) {                open();            } else {                close();            }        }        @Override        public void onViewPositionChanged(View changedView, int left, int top,                int dx, int dy) {            if (changedView == vg_main) {                mainLeft = left;            } else {                mainLeft = mainLeft + left;            }            if (mainLeft < 0) {                mainLeft = 0;            } else if (mainLeft > range) {                mainLeft = range;            }            if (isShowShadow) {                iv_shadow.layout(mainLeft, 0, mainLeft + width, height);            }            if (changedView == vg_left) {                vg_left.layout(0, 0, width, height);                vg_main.layout(mainLeft, 0, mainLeft + width, height);            }            dispatchDragEvent(mainLeft);        }    };    public interface DragListener {        public void onOpen();        public void onClose();        public void onDrag(float percent);    }    public void setDragListener(DragListener dragListener) {        this.dragListener = dragListener;    }    @Override    protected void onFinishInflate() {        super.onFinishInflate();        if (isShowShadow) {            iv_shadow = new ImageView(context);            iv_shadow.setImageResource(R.drawable.ic_launcher);            LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);            addView(iv_shadow, 1, lp);        }        vg_left = (RelativeLayout) getChildAt(0);        vg_main = (MyRelativeLayout) getChildAt(isShowShadow ? 2 : 1);        vg_main.setDragLayout(this);        vg_left.setClickable(true);        vg_main.setClickable(true);    }    public ViewGroup getVg_main() {        return vg_main;    }    public ViewGroup getVg_left() {        return vg_left;    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        width = vg_left.getMeasuredWidth();        height = vg_left.getMeasuredHeight();        range = (int) (width * 0.6f);    }    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        vg_left.layout(0, 0, width, height);        vg_main.layout(mainLeft, 0, mainLeft + width, height);    }    @Override    public boolean onInterceptTouchEvent(MotionEvent ev) {        return dragHelper.shouldInterceptTouchEvent(ev) && gestureDetector.onTouchEvent(ev);    }    @Override    public boolean onTouchEvent(MotionEvent e) {        try {            dragHelper.processTouchEvent(e);        } catch (Exception ex) {            ex.printStackTrace();        }        return false;    }    private void dispatchDragEvent(int mainLeft) {        if (dragListener == null) {            return;        }        float percent = mainLeft / (float) range;        animateView(percent);        dragListener.onDrag(percent);        Status lastStatus = status;        if (lastStatus != getStatus() && status == Status.Close) {            dragListener.onClose();        } else if (lastStatus != getStatus() && status == Status.Open) {            dragListener.onOpen();        }    }    private void animateView(float percent) {        float f1 = 1 - percent * 0.3f;        ViewHelper.setScaleX(vg_main, f1);        ViewHelper.setScaleY(vg_main, f1);        ViewHelper.setTranslationX(vg_left, -vg_left.getWidth() / 2.3f + vg_left.getWidth() / 2.3f * percent);        ViewHelper.setScaleX(vg_left, 0.5f + 0.5f * percent);        ViewHelper.setScaleY(vg_left, 0.5f + 0.5f * percent);        ViewHelper.setAlpha(vg_left, percent);        if (isShowShadow) {            ViewHelper.setScaleX(iv_shadow, f1 * 1.4f * (1 - percent * 0.12f));            ViewHelper.setScaleY(iv_shadow, f1 * 1.85f * (1 - percent * 0.12f));        }        getBackground().setColorFilter(evaluate(percent, Color.BLACK, Color.TRANSPARENT), Mode.SRC_OVER);    }    private Integer evaluate(float fraction, Object startValue, Integer endValue) {        int startInt = (Integer) startValue;        int startA = (startInt >> 24) & 0xff;        int startR = (startInt >> 16) & 0xff;        int startG = (startInt >> 8) & 0xff;        int startB = startInt & 0xff;        int endInt = (Integer) endValue;        int endA = (endInt >> 24) & 0xff;        int endR = (endInt >> 16) & 0xff;        int endG = (endInt >> 8) & 0xff;        int endB = endInt & 0xff;        return (int) ((startA + (int) (fraction * (endA - startA))) << 24)                | (int) ((startR + (int) (fraction * (endR - startR))) << 16)                | (int) ((startG + (int) (fraction * (endG - startG))) << 8)                | (int) ((startB + (int) (fraction * (endB - startB))));    }    @Override    public void computeScroll() {        if (dragHelper.continueSettling(true)) {            ViewCompat.postInvalidateOnAnimation(this);        }    }    public enum Status {        Drag, Open, Close    }    public Status getStatus() {        if (mainLeft == 0) {            status = Status.Close;        } else if (mainLeft == range) {            status = Status.Open;        } else {            status = Status.Drag;        }        return status;    }    public void open() {        open(true);    }    public void open(boolean animate) {        if (animate) {            if (dragHelper.smoothSlideViewTo(vg_main, range, 0)) {                ViewCompat.postInvalidateOnAnimation(this);            }        } else {            vg_main.layout(range, 0, range * 2, height);            dispatchDragEvent(range);        }    }    public void close() {        close(true);    }    public void close(boolean animate) {        if (animate) {            if (dragHelper.smoothSlideViewTo(vg_main, 0, 0)) {                ViewCompat.postInvalidateOnAnimation(this);            }        } else {            vg_main.layout(0, 0, width, height);            dispatchDragEvent(0);        }    }}
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