Android圆盘转动demo

package kaven; import java.util.ArrayList; import chroya.demo.roundspin.R; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.util.FloatMath; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.widget.Toast; /** * 可以转动的View * @author kaven * */ public class RoundPlateView extends View { private Paint mPaint = new Paint(); //stone列表 private BigStone[] mStones; //数目 private int STONE_COUNT = 6; private int sum; //圆心坐标 private int mPointX=0, mPointY=0; //半径 private int mRadius = 0; //每两个点间隔的角度差 private int mDegreeDelta; //点击了哪一个按钮 private int downIndex; //是否是点击 private boolean isDown; private float firstX; private float firstY; public RoundPlateView(Context context, int px, int py, int radius) { super(context); mPaint.setColor(Color.RED); mPaint.setStrokeWidth(2); setBackgroundResource(R.drawable.bg); myBtnArrayList = new ArrayList<RoundPlateView.MyButton>(); mPointX = px; mPointY = py; mRadius = radius; } public void setBitmap(ArrayList<Bitmap> arrayList){ //my if(arrayList!=null&&arrayList.size()>0){ sum=arrayList.size(); int angle=0; mDegreeDelta=360/sum; for(int i=0;i<sum;i++){ MyButton myButton=new MyButton(); myButton.angle=angle; myButton.bitmap=arrayList.get(i); angle += mDegreeDelta; myBtnArrayList.add(myButton); } computeCoordinates(); } } /** * 重新计算每个点的角度 */ private void resetStonesAngle(float x, float y) { //my int angle = computeCurrentAngle(x, y); myBtnArrayList.get(downIndex).angle=angle; angle+=mDegreeDelta; int i=downIndex+1; for(;i<sum;i++){ myBtnArrayList.get(i).angle=angle; angle+=mDegreeDelta; } i=0; for(;i<downIndex;i++){ myBtnArrayList.get(i).angle=angle; angle+=mDegreeDelta; } } /** * 计算每个点的坐标 */ private void computeCoordinates() { //my for(int i=0;i<sum;i++){ MyButton myButton = myBtnArrayList.get(i); myButton.x=mPointX+ (float)(mRadius * Math.cos(myButton.angle*Math.PI/180)); myButton.y=mPointY+ (float)(mRadius * Math.sin(myButton.angle*Math.PI/180)); } } /** * 计算第一个点的角度 * @param x * @param y * @return */ private int computeCurrentAngle(float x, float y) { float distance = (float)Math.sqrt(((x-mPointX)*(x-mPointX) + (y-mPointY)*(y-mPointY))); int degree = (int)(Math.acos((x-mPointX)/distance)*180/Math.PI); if(y < mPointY) { degree = -degree; } return degree; } @Override public boolean dispatchTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: //my isDown=true; firstX=x; firstY=y; for(int i=0;i<sum;i++){ float x2 = myBtnArrayList.get(i).x; float y2 = myBtnArrayList.get(i).y; float ddx=x-x2; float ddy=y-y2; float dis = FloatMath.sqrt(ddx*ddx+ddy*ddy); Log.d("tag","dis:"+dis); if(dis<(mRadius/2)){ downIndex=i; break; } } break; case MotionEvent.ACTION_UP: //my for(int i=0;i<sum;i++){ float x2 = myBtnArrayList.get(i).x; float y2 = myBtnArrayList.get(i).y; float ddx=x-x2; float ddy=y-y2; float dis = FloatMath.sqrt(ddx*ddx+ddy*ddy); if(dis<(mRadius/2)){ if(isDown){ if(onClickListener!=null){ onClickListener.onCustomClick(i); } } break; } } break; case MotionEvent.ACTION_MOVE: float x2 = event.getX(); float y2 = event.getY(); float x3=x2-firstX; float y3=y2-firstY; if(FloatMath.sqrt(x3*x3+y3*y3)>4.0){ resetStonesAngle(event.getX(), event.getY()); computeCoordinates(); invalidate(); firstX=x2; firstY=y2; isDown=false; } break; default: break; } return true; } @Override public void onDraw(Canvas canvas) { canvas.drawPoint(mPointX, mPointY, mPaint); //my for(int i=0;i<sum;i++){ drawInCenter(canvas,myBtnArrayList.get(i).bitmap,myBtnArrayList.get(i).x,myBtnArrayList.get(i).y); } } /** * 把中心点放到中心处 * @param canvas * @param bitmap * @param left * @param top */ private void drawInCenter(Canvas canvas, Bitmap bitmap, float left, float top) { canvas.drawPoint(left, top, mPaint); canvas.drawBitmap(bitmap, left-bitmap.getWidth()/2, top-bitmap.getHeight()/2, null); } private class MyButton{ Bitmap bitmap; int angle; float x; float y; } class BigStone { Bitmap bitmap; int angle; float x; float y; } //点击的事件 public interface CustomOnClickListener{ void onCustomClick(int item); } private CustomOnClickListener onClickListener; private ArrayList<MyButton> myBtnArrayList; public void setCustomOnClickListener(CustomOnClickListener clickListener){ this.onClickListener=clickListener; } }