精灵菜单

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一、功能介绍

1、简述

这是一个自己定义菜单View，包括菜单button和子菜单列表。

仅仅是基础呈现。

2、功能描写叙述

a、支持与该菜单的各种交互。包含：单机、双击、上下左右滑动、长按等；

b、单次点击，可隐藏或显示子菜单列表；

c、长按，可托拽到任何位置；

d、拖动过程中。子菜单列表始终围绕在菜单button周围；

e、支持随意个子菜单。支持动态添加、降低子菜单数量；

f、菜单buttonView可任意更改。

3、动画演示

               

二、技术难点

1、自己定义View；

2、子菜单位置的计算；

3、交互事件，使用OnGestureListener、GestureDetector类；

4、托拽过程中，子菜单排列位置的实时变化。

三、设计思路

1、自己定义View

注意onMeasure、onDraw方法和自己定义的notifyLocationSetChanged方法。

2、子菜单位置计算

子菜单排列有九种方式：

屏幕中间CENTER,顺时针排列。

在屏幕左边界上BOUNDARY_LEFT，顺时针排列；

在屏幕右边界上BOUNDARY_RIGHT。逆时针排列。

在屏幕顶部边界上BOUNDARY_TOP，逆时针排列。

在屏幕底部边界上BOUNDARY_BOTTOM，顺时针排列；

在屏幕左上角CORNER_LEFT_TOP。顺时针排列；

在屏幕左下角CORNER_LEFT_BOTTOM，顺时针排列；

在屏幕右上角CORNER_RIGHT_TOP。逆时针排列；

在屏幕右下角CORNER_RIGHT_BOTTOM，顺时针排列。

注：在本文中约定，在以菜单中心为原点二维坐标系中。x轴正方向上为起始0弧度。则Y轴正方向上为-PI/2弧度。x轴负方向上为起始-PI弧度。

这里推理方式都差点儿相同，仅以 屏幕中间CENTER 情况为例分析：

此时，子菜单能够环绕菜单button一周，即2*PI，那么子菜单之间的夹角为unitRadian = 2*PI/(count - 1)  （count为子菜单的数量），我们能够得到，第一个子菜单位置在Y轴负方向上，距离为radius。第二个子菜单在在顺时针方向。与X轴正方向的夹角为-PI+unitRadian，以此类推。就能够得到全部子菜单位置，从而得到各子菜单距离菜单中心点的位置。到此就得到了Location。

从上面推理，能够得到子菜单的几点重要属性：起始位置startRadian、单位夹角unitRadian、方向direction、半径radius。

3、交互事件

当然会想到GestureDetector类处理。

4、托拽功能

监听长按事件和Touch事件的Move事件，依据矢量位移和图片在屏幕中的位置。在move过程中使用void android.view.ViewGroup.layout(int l, int t, int r, int b)方法。可重绘layout的位置。

四、源代码展示

源代码包含五部分：

菜单接口ChildsMenu

自己定义的菜单视图ChildsMenuLayout

主菜单位置信息Location

交互精灵 GestureSprite

ChildsMenu.java:

public interface ChildsMenu {
	public Point DEFAULT_POSITION = new Point(0, 0);
	public void showChilds(View[] view);
	public void notifyLocationSetChanged();
}

ChildsMenuLayout.java:

public class ChildsMenuLayout extends RelativeLayout implements ChildsMenu {
	public double radius = 140d;
	private Point position = DEFAULT_POSITION;
	private List<PointF> points;
	private Context mContext;
	private View[] views;
	private LOCATION location;
	private boolean isShow = false;

	public ChildsMenuLayout(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
		mContext = context;
		setWillNotDraw(false);
	}

	public ChildsMenuLayout(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
		mContext = context;
		setWillNotDraw(false);
	}

	public ChildsMenuLayout(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		// TODO Auto-generated constructor stub
		mContext = context;
		setWillNotDraw(false);
	}

	@Override
	public void showChilds(View[] views) {
		// TODO Auto-generated method stub
		isShow = true;
		this.views = views;
		points = getDataPoints(views);
		this.invalidate();
	}

	public void hideChilds() {
		isShow = false;
		this.invalidate();
	}

	private List<PointF> getDataPoints(View[] views) {
		if (views == null) {
			isShow = false;
			return null;
		}
		Location locationOnScreen = new Location(mContext , this);
		location = locationOnScreen.getLocation();
		List<PointF> points = new ArrayList<PointF>();
		int count = views.length;
		double unitRadian = 0;
		double startRadian = 0;
		double endRadian = 0;
		final int Clockwise = 1;//顺时针
		final int Eastern = -1;//逆时针
		int direction = Clockwise;
		double temp;
		switch (location) {
		case BOUNDARY_BOTTOM:
			temp =Math.PI/2 - Math.asin((locationOnScreen.bottom + radius)/radius);
			unitRadian = 2*(Math.PI -temp)/ (count - 1);
			direction = Clockwise;
			startRadian = -Math.PI*3/2+temp;
			break;
		case BOUNDARY_LEFT:
			temp =Math.PI/2 - Math.asin((locationOnScreen.left + radius)/radius);
			unitRadian = 2*(Math.PI - temp) / (count - 1);
			direction = Clockwise;
			startRadian = -Math.PI  + temp;
			break;
		case BOUNDARY_RIGHT:
			temp =Math.PI/2 - Math.asin((locationOnScreen.right + radius)/radius);
			unitRadian = 2*(Math.PI - temp) / (count - 1);
			direction = Eastern;
			startRadian = - temp;
			break;
		case BOUNDARY_TOP:
			temp =Math.PI/2 - Math.asin((locationOnScreen.top + radius)/radius);
			unitRadian = 2*(Math.PI -temp) / (count - 1);
			direction = Eastern;
			startRadian = -Math.PI/2 - temp;
			break;
		case CENTER:
			unitRadian = Math.PI * 2 / count;
			direction = Clockwise;
			startRadian = -Math.PI;
			break;
		case CORNER_LEFT_BOTTOM:
			startRadian = Math.asin((radius+locationOnScreen.left)/radius);
			endRadian = Math.asin((radius+locationOnScreen.bottom)/radius);
			unitRadian = (Math.PI / 2+startRadian+endRadian) / (count - 1);
			direction = Clockwise;
			startRadian = -Math.PI / 2 -startRadian;
			break;
		case CORNER_LEFT_TOP:
			startRadian = Math.asin((radius+locationOnScreen.top)/radius);
			endRadian = Math.asin((radius+locationOnScreen.left)/radius);
			unitRadian = (Math.PI / 2+startRadian+endRadian) / (count - 1);
			direction = Clockwise;
			startRadian = -startRadian;
			break;
		case CORNER_RIGHT_BOTTOM:
			startRadian = Math.asin((radius+locationOnScreen.right)/radius);
			endRadian = Math.asin((radius+locationOnScreen.bottom)/radius);
			unitRadian = (Math.PI / 2+startRadian+endRadian) / (count - 1);
			direction = Eastern;
			startRadian = -Math.PI / 2+startRadian;
			break;
		case CORNER_RIGHT_TOP:
			startRadian = Math.asin((radius+locationOnScreen.top)/radius);
			endRadian = Math.asin((radius+locationOnScreen.right)/radius);
			unitRadian = (Math.PI / 2+startRadian+endRadian) / (count - 1);
			direction = Eastern;
			startRadian = -Math.PI + startRadian;
			break;
		default:
			break;
		}
		for (int i = 0; i < count; i++) {
			PointF pt = new PointF();
			if (direction == Eastern) {
				float offsetX = (float) (position.x + radius
						* Math.cos(-i * unitRadian + startRadian));
				float offsetY = (float) (position.y + radius
						* Math.sin(-i * unitRadian + startRadian));
				pt.set(offsetX, offsetY);
			} else if (direction == Clockwise) {
				float offsetX = (float) (position.x + radius
						* Math.cos(i * unitRadian + startRadian));
				float offsetY = (float) (position.y + radius
						* Math.sin(i * unitRadian + startRadian));
				pt.set(offsetX, offsetY);
			}

			points.add(pt);
		}
		return points;
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		// TODO Auto-generated method stub
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		radius = this.getWidth() / 2 - 20;
		position = new Point(this.getWidth() / 2, this.getHeight() / 2);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		super.onDraw(canvas);
		Paint paint = new Paint();
		paint.setARGB(255, 207, 0, 112);
		paint.setTextSize(30);
		paint.setAntiAlias(true);
		if (points != null && isShow) {
			for (int i = 0; i < points.size(); i++) {
				PointF pt = points.get(i);
				canvas.drawText("" + i, pt.x, pt.y, paint);
			}
		}
	}

	@Override
	public void notifyLocationSetChanged() {
		// TODO Auto-generated method stub
		Location locationOnScreen = new Location(mContext , this);
		LOCATION temp = locationOnScreen.getLocation();
		if(location== LOCATION.CENTER && temp == location){
			return;
		}
		location = temp;
		points = getDataPoints(views);
		this.invalidate();
	}
}

GestureSprite.java

public class GestureSprite implements OnTouchListener, OnGestureListener {
	private TextView tv2;
	private ChildsMenuLayout mLayout;
	private Context mContext;
	private GestureDetector detector = new GestureDetector(this);
    private final int MODE_DRAG = 0x1000;
    private final int MODE_ZOOM = MODE_DRAG + 1;
    private final int MODE_DEFAULT = -1;
    private int MODE = MODE_DEFAULT;
    private PointF oldPosition;
    private PointF delta;
    
    private View[] childViews;
    private LOCATION location;
    
    //************onTouch  start***********
    private float x = 0, y = 0;  
    private int dx, dy;
    private int left = 0, top = 0;
    //************onTouch  end***********
    
    private boolean isShowMenu = false;
    @SuppressLint("NewApi")
	public GestureSprite(Context context , ChildsMenuLayout layout,TextView tv2){
    	mLayout = layout;
    	mContext = context;
    	this.tv2 = tv2;
    }
    
	// 用户轻触触摸屏。由1个MotionEvent ACTION_DOWN触发
	@Override
	public boolean onDown(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("onDown");
		tv2.setText("轻触触摸屏  按下");
		return false;
	}
	
	// 用户轻触触摸屏，尚未松开或拖动。由一个1个MotionEvent ACTION_DOWN触发
	// 注意和onDown()的差别，强调的是没有松开或者拖动的状态
	@Override
	public void onShowPress(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("onShowPress");
		tv2.setText("轻触触摸屏，尚未松开或拖动");
	}

	// 用户（轻触触摸屏后）松开，由一个1个MotionEvent ACTION_UP触发
	@Override
	public boolean onSingleTapUp(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("onSingleTapUp");
		toggleMenu();
		tv2.setText("轻触触摸屏后松开");
		return false;
	}

	// 用户按下触摸屏，并拖动，由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE触发
	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
			float distanceY) {
		// TODO Auto-generated method stub
		System.out.println("onScroll");
		tv2.setText("按下触摸屏，并拖动");
		return false;
	}

	// 用户长按触摸屏，由多个MotionEvent ACTION_DOWN触发
	@Override
	public void onLongPress(MotionEvent e) {
		// TODO Auto-generated method stub
		System.out.println("onLongPress");
		tv2.setText("长按触摸屏");
		MODE = MODE_DRAG;
	}

	// 用户按下触摸屏、高速移动后松开。由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE, 1个ACTION_UP触发
	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {
		// TODO Auto-generated method stub
		float dx = e2.getX() - e1.getX();  
        float dy = e2.getY() - e1.getY();  
        if(dx > 0 && Math.abs(dx) > Math.abs(dy)){
        	System.out.println("onFling right");
        	tv2.setText("右滑");
        }else if(dx < 0 && Math.abs(dx) > Math.abs(dy)){
        	System.out.println("onFling left");
        	tv2.setText("左滑");
        }else if(dy > 0 && Math.abs(dy) > Math.abs(dx)){
        	System.out.println("onFling down");
        	tv2.setText("下滑");
        }else if(dy < 0 && Math.abs(dy) > Math.abs(dx)){
        	tv2.setText("上滑");
        	System.out.println("onFling up");
        }
		return false;
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		// TODO Auto-generated method stub
		detector.onTouchEvent(event);
		switch (event.getAction() & MotionEvent.ACTION_MASK) {
		case MotionEvent.ACTION_DOWN: // 指点杆按下
			// 将当前的坐标保存为起始点
			 x = event.getRawX();  
             y = event.getRawY();  
             left = mLayout.getLeft();
             top = mLayout.getTop();
			break;
		case MotionEvent.ACTION_MOVE: // 指点杆保持按下。而且进行位移
			if (MODE == MODE_DRAG) {
				dx =  (int) ((event.getRawX() -x) + left);  
                dy =  (int) ((event.getRawY() -y) + top);  
                mLayout.layout(dx, dy, dx + mLayout.getWidth(), dy + mLayout.getHeight());
                mLayout.notifyLocationSetChanged();
			}
			break;
		case MotionEvent.ACTION_UP: // 指点杆离开屏幕
			MODE = MODE_DEFAULT;
			break;
		case MotionEvent.ACTION_POINTER_UP: // 有手指头离开屏幕，但还有没离开的
			break;
		case MotionEvent.ACTION_POINTER_DOWN: // 假设已经有手指压在屏幕上，又有一个手指压在了屏幕上
			break;
		}
		return true;
	}
	
	private void toggleMenu(){
		isShowMenu = isShowMenu?closeMenu():openMenu();
	}
	
	private boolean openMenu(){
		childViews = new View[6];
		mLayout.showChilds(childViews);
		return true;
	}
	
	private boolean closeMenu(){
//		int count = mLayout.getChildCount();
//		if(count > 1){
//			mLayout.removeViews(1, count);
//			mLayout.invalidate();
//		}
		mLayout.hideChilds();
		return false;
	}
	
	private void setLocation(){
		View menuBtn = mLayout.getChildAt(0);
		
	}

Location.java:

public class Location {
	private int screenWidth;
	private int screenHeight;
	private int viewWidth;
	private int viewHeight;
	public double left;
	public double top;
	public double bottom;
	public double right;
	private int code;
	public enum LOCATION{
		CENTER,BOUNDARY_LEFT,BOUNDARY_RIGHT,BOUNDARY_TOP,BOUNDARY_BOTTOM,CORNER_LEFT_TOP,CORNER_LEFT_BOTTOM
		,CORNER_RIGHT_TOP,CORNER_RIGHT_BOTTOM
	}
	
	public Location(Context context,View view){
		screenWidth  = ((Activity)context).getWindowManager().getDefaultDisplay().getWidth(); 
		screenHeight = ((Activity)context).getWindowManager().getDefaultDisplay().getHeight(); 
		viewWidth = view.getWidth();
		viewHeight = view.getHeight();
		int[] array = new int[2];
		view.getLocationOnScreen(array);
		left = array[0];
		top = array[1];
		right = screenWidth - (left + viewWidth);
		bottom = screenHeight - (top + viewHeight);
	}
	
	
	private void onLeft(){
		code = left < 0 ?
 0x0001 : 0x0;
	}
	
	private void onRight(){
		code = right < 0 ? code + 0x0010 : code;
	}
	
	private void onTop(){
		code = top < 0 ? code + 0x0100 : code;
	}
	
	private void onBottom(){
		code = bottom < 0 ? code + 0x1000 : code;
	}
	
//	private void onCornerLeftTop(){
//		code = onLeft()&&onTop() ?
 code + 1 : code;
//	}
//	
//	private void onCornerLeftBottom(){
//		code = onLeft()&&onBottom();
//	}
//	
//	private void onCornerRightTop(){
//		code = onRight()&&onTop();
//	}
//	
//	private void onCornerRightBottom(){
//		code = onRight()&&onBottom();
//	}
	
	public LOCATION getLocation(){
		LOCATION location = null;
		onLeft();
		onRight();
		onTop();
		onBottom();
		switch (code) {
		case 0x0000:
			location = LOCATION.CENTER;
			break;
		case 0x0001:
			location = LOCATION.BOUNDARY_LEFT;
			break;
		case 0x0010:
			location = LOCATION.BOUNDARY_RIGHT;
			break;
		case 0x0100:
			location = LOCATION.BOUNDARY_TOP;
			break;
		case 0x1000:
			location = LOCATION.BOUNDARY_BOTTOM;
			break;
		case 0x1001:
			location = LOCATION.CORNER_LEFT_BOTTOM;
			break;
		case 0x0101:
			location = LOCATION.CORNER_LEFT_TOP;
			break;
		case 0x1010:
			location = LOCATION.CORNER_RIGHT_BOTTOM;
			break;
		case 0x0110:
			location = LOCATION.CORNER_RIGHT_TOP;
			break;
		default:
			break;
		}
		return location;
	}
}

xml:

<RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <com.example.template.sprite.ChildsMenuLayout
            android:id="@+id/layout_bb_menu"
            android:layout_width="150sp"
            android:layout_height="150sp"
            android:layout_centerInParent="true" >

            <ImageView
                android:id="@+id/btn_bb_menu"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:longClickable="true"
                android:scaleType="matrix"
                android:src="@drawable/ic_launcher" />
        </com.example.template.sprite.ChildsMenuLayout>
    </RelativeLayout>

调用时，仅仅需一行代码：

menuBtn = (ImageView) findViewById(R.id.btn_bb_menu);
menuBtn.setOnTouchListener(new GestureSprite(this, menuLayout,tv2));

请标明转载自：http://blog.csdn.net/toyuexinshangwan/article/details/37594329

源代码下载地址：http://download.csdn.net/detail/toyuexinshangwan/7613097

版权声明：本文博主原创文章，博客，未经同意不得转载。