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   源码介绍

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public class LoginView extends RelativeLayout {
	/** Scroller 拖动类 */
	private Scroller mScroller;
	/** 屏幕高度  */
	private int mScreenHeigh = 0;
	/** 屏幕宽度  */
	private int mScreenWidth = 0;
	/** 点击时候Y的坐标*/
	private int downY = 0;
	/** 拖动时候Y的坐标*/
	private int moveY = 0;
	/** 拖动时候Y的方向距离*/
	private int scrollY = 0;
	/** 松开时候Y的坐标*/
	private int upY = 0;
	/** 是否在移动*/
	private Boolean isMoving = false;
	/** 布局的高度*/
	private int viewHeight = 0;
	/** 是否打开*/	
	public boolean isShow = false;
	/** 是否可以拖动*/	
	public boolean mEnabled = true;
	/** 点击外面是否关闭该界面*/	
	public boolean mOutsideTouchable = true;
	/** 上升动画时间 */
	private int mDuration = 800;
	private final static String TAG = "LoginView";
	public LoginView(Context context) {
		super(context);
		init(context);
	}

	public LoginView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init(context);
	}

	public LoginView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init(context);
	}

	private void init(Context context) {
		setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
		setFocusable(true);
		mScroller = new Scroller(context);
		mScreenHeigh = BaseTools.getWindowHeigh(context);
		mScreenWidth = BaseTools.getWindowWidth(context);
		// 背景设置成透明
		this.setBackgroundColor(Color.argb(0, 0, 0, 0));
		final View view = LayoutInflater.from(context).inflate(R.layout.view_login,null);
		LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);// 如果不给他设这个，它的布局的MATCH_PARENT就不知道该是多少
		addView(view, params);// ViewGroup的大小，
		// 背景设置成透明
		this.setBackgroundColor(Color.argb(0, 0, 0, 0));
		view.post(new Runnable() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				viewHeight = view.getHeight();
			}
		});
		LoginView.this.scrollTo(0, mScreenHeigh);
		ImageView btn_close = (ImageView)view.findViewById(R.id.btn_close);
		btn_close.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				dismiss();
			}
		});
	}

	@Override
	public boolean onInterceptTouchEvent(MotionEvent ev) {
		if(!mEnabled){
			return false;
		}
		return super.onInterceptTouchEvent(ev);
	}
	
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		// TODO Auto-generated method stub
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			downY = (int) event.getY();
			Log.d(TAG, "downY = "   downY);
			//如果完全显示的时候，让布局得到触摸监听，如果不显示，触摸事件不拦截，向下传递
			if(isShow){
				return true;
			}
			break;
		case MotionEvent.ACTION_MOVE:
			moveY = (int) event.getY();
			scrollY = moveY - downY;
			//向下滑动
			if (scrollY > 0) {
				if(isShow){
					scrollTo(0, -Math.abs(scrollY));
				}
			}else{
				if(mScreenHeigh - this.getTop() <= viewHeight && !isShow){
					scrollTo(0, Math.abs(viewHeight - scrollY));
				}
			}
			break;
		case MotionEvent.ACTION_UP:
			upY = (int) event.getY();
			if(isShow){
				if( this.getScrollY() <= -(viewHeight /2)){
					startMoveAnim(this.getScrollY(),-(viewHeight - this.getScrollY()), mDuration);
					isShow = false;
					Log.d("isShow", "false");
				} else {
					startMoveAnim(this.getScrollY(), -this.getScrollY(), mDuration);
					isShow = true;
					Log.d("isShow", "true");
				}
			}
			Log.d("this.getScrollY()", "" this.getScrollY());
			changed();
			break;
		case MotionEvent.ACTION_OUTSIDE:
			Log.d(TAG, "ACTION_OUTSIDE");
			break;
		default:
			break;
		}
		return super.onTouchEvent(event);
	}
	
	/**
	 * 拖动动画
	 * @param startY  
	 * @param dy  移动到某点的Y坐标距离
	 * @param duration 时间
	 */
	public void startMoveAnim(int startY, int dy, int duration) {
		isMoving = true;
		mScroller.startScroll(0, startY, 0, dy, duration);
		invalidate();//通知UI线程的更新
	}
	
	@Override
	public void computeScroll() {
		if (mScroller.computeScrollOffset()) {
			scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
			// 更新界面
			postInvalidate();
			isMoving = true;
		} else {
			isMoving = false;
		}
		super.computeScroll();
	}
	
	/** 开打界面 */
	public void show(){
		if(!isShow && !isMoving){
			LoginView.this.startMoveAnim(-viewHeight,   viewHeight, mDuration);
			isShow = true;
			Log.d("isShow", "true");
			changed();
		}
	}
	
	/** 关闭界面 */
	public void dismiss(){
		if(isShow && !isMoving){
			LoginView.this.startMoveAnim(0, -viewHeight, mDuration);
			isShow = false;
			Log.d("isShow", "false");
			changed();
		}
	}
	
	/** 是否打开 */
	public boolean isShow(){
		return isShow;
	}
	
	/** 获取是否可以拖动*/
	public boolean isSlidingEnabled() {
		return mEnabled;
	}
	
	/** 设置是否可以拖动*/
	public void setSlidingEnabled(boolean enabled) {
		mEnabled = enabled;
	}
	
	/**
	 * 设置监听接口，实现遮罩层效果
	 */
	public void setOnStatusListener(onStatusListener listener){
		this.statusListener = listener;
	}
	
    public void setOutsideTouchable(boolean touchable) {
        mOutsideTouchable = touchable;
    }
	/**
	 * 显示状态发生改变时候执行回调借口
	 */
	public void changed(){
		if(statusListener != null){
			if(isShow){
				statusListener.onShow();
			}else{
				statusListener.onDismiss();
			}
		}
	}
	
	/** 监听接口*/
	public onStatusListener statusListener;
	
	/**
	 * 监听接口，来在主界面监听界面变化状态
	 */
	public interface onStatusListener{
		/**  开打状态  */
		public void onShow();
		/**  关闭状态  */
		public void onDismiss();
	}
	
	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		// TODO Auto-generated method stub
		super.onLayout(changed, l, t, r, b);
	}
}