效果：
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class RotateView extends View {
float Degree;
float mCenterY = 150;
float mCenterX = 150;
float circlueradius2;
ArrayList<PaintLine> mArryPaintLine;
boolean mBooleanMove = true;
double postion;
float moveX;
float moveY;
boolean mNewLine = false;
boolean rotateDirect = true;
private float rotateAngle;
Handler mHandler;
Thread MyInvalidateThread;
boolean mThreadIsStart = false;
static Context mContext;
public RotateView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
mArryPaintLine = new ArrayList<PaintLine>();
mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
//super.handleMessage(msg);
if (msg.what==1) {
Log.d("msg", ""+msg.what);
RotateView.this.postInvalidate();
Log.i("mArryPaintLine.size", ""+mArryPaintLine.size());
for(int i=0;i<mArryPaintLine.size();i++){
if(mArryPaintLine.get(i).index<0){
mArryPaintLine.remove(i);
i=i-1;
}
}
}
}
};
MyInvalidateThread =new Thread() {
@Override
public void run() {
Log.i("runable:", "runable::");
Message msg = mHandler.obtainMessage();
msg.what = 1;
mThreadIsStart = true;
while(mArryPaintLine.size()>0){
try {
MyInvalidateThread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(mArryPaintLine.size()!=0){
mHandler.sendEmptyMessage(msg.what);
}
}
}
};
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
if(mArryPaintLine!=null){
for (int i = 0; i < mArryPaintLine.size(); i++) {
// Log.i("mArryPaintLine", "mArryPaintLine"+mArryPaintLine.size());
PaintLine _paintLine =mArryPaintLine.get(i);//mArryPaintLine.get(0);
canvas.drawLine(_paintLine.StartX, _paintLine.StartY,
_paintLine.EndX, _paintLine.EndY, _paintLine.paint);
}
}
canvas.restore();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Log.i("down", "down");
moveX = x;
moveY = y;
this.postInvalidate();
return true;
case MotionEvent.ACTION_MOVE:
Log.i("move", "move");
mBooleanMove = true;
Degree = (float) Math.toDegrees(Math.atan2(mCenterY - y, mCenterX - x));
Log.i("Degree:", ""+(Degree+180));
Degree = ((int)(Degree+2.5)/5)*5;
double thet1 = 0;// 角度计算
double thet2 = 0;
if (x - mCenterX != 0) {
thet1 = Math.atan((y - mCenterY) / (x - mCenterX));
}
if (moveX - mCenterX != 0) {
thet2 = Math.atan((moveY - mCenterY) / (moveX - mCenterX));
}
thet1 = Math.toDegrees(thet1);
thet2 = Math.toDegrees(thet2);
double delAngle = 0;
if (thet1 > 0 && thet2 < 0 || thet2 > 0 && thet1 < 0) {
delAngle = (thet1 + thet2);
} else {
delAngle = (thet1 - thet2);
}
// 角度判断
postion += delAngle;
if(postion>0){
rotateDirect = true;
}else if(postion<0){
rotateDirect = false;
}
if (postion > 30) {
postion = 0;
} else if (postion < -30) {
postion = 0;
}
// 累加
rotateAngle += delAngle;
rotateAngle %= 360;
/*if(Math.abs(delAngle)<=20&(Math.abs(delAngle)>5)){
for(int i =0;i< delAngle/5;i++){
Degree+=5;
calculate(Degree+180);
}
}else if(Math.abs(delAngle)>20){
for (int i =0;i<mArryPaintLine.size(); i++) {
mArryPaintLine.get(i).interrupt();
mArryPaintLine.remove(i);
}
calculate(Degree+180);
}else {*/
calculate(Degree+180);
// }
//calculate(Degree+180);
//PaintLine _paintLine = calculate(Degree+180);
//_paintLine.start();
for (int i =0;i<mArryPaintLine.size(); i++) {
//PaintLine _paintLine = mArryPaintLine.get(i);
if(mArryPaintLine.get(i).isAlive()==false&mArryPaintLine.get(i).index==180){
mArryPaintLine.get(i).start();
}else if(mArryPaintLine.get(i).index==0){
//_paintLine = null;
mArryPaintLine.get(i).interrupt();
mArryPaintLine.remove(i);
}
}
this.postInvalidate();
return true;
case MotionEvent.ACTION_UP:
Log.i("up", "up");
mBooleanMove = false;
//for (int i =0;i<mArryPaintLine.size();) {
//PaintLine _paintLineT = mArryPaintLine.get(i);
/*if(_paintLineT.isAlive()==false&mArryPaintLine.get(i).index==180){
_paintLineT.start();
}else if(_paintLineT.index==0){
//_paintLineT = null;
mArryPaintLine.get(i).interrupt();
mArryPaintLine.remove(i);
}*/
if(mArryPaintLine.size()!=0&!MyInvalidateThread.isAlive()){
/* Message msg = mHandler.obtainMessage();
msg.what = 1;
mHandler.sendEmptyMessage(msg.what);*/
// MyInvalidateThread = null;
MyInvalidateThread =new Thread() {
@Override
public void run() {
Log.i("runable:", "runable::");
Message msg = mHandler.obtainMessage();
msg.what = 1;
mThreadIsStart = true;
while(mArryPaintLine.size()>0){
try {
MyInvalidateThread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(mArryPaintLine.size()!=0){
mHandler.sendEmptyMessage(msg.what);
}
}
}
};
MyInvalidateThread.start();
/*}else if(mThreadIsStart==true){
MyInvalidateThread.resume();*/
}
// }
//this.postInvalidate();
return true;
case MotionEvent.ACTION_CANCEL:
Log.i("cancel", "cancel");
return true;
default:
break;
}
Log.i("return", "return");
return super.onTouchEvent(event);
}
/**
* 根据手机的分辨率从 dp 的单位 转成为 px(像素)
*/
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
public void calculate(float pCirclueAngle){
Log.i("pCirclueAngle:", ""+pCirclueAngle);
float circlueradius = 150;
/*if(((int)pCirclueAngle%4)==0){
mNewLine = true;
}else {
mNewLine = false;
}*/
float CirclueAngleFirst = pCirclueAngle;
float StartX ;
float StartY ;
float EndX ;
float EndY ;
//float CirclueAngleFirst = pCirclueAngle;
StartY = (float) (mCenterY + circlueradius * Math.sin(CirclueAngleFirst * (Math.PI /180)));
StartX = (float) (mCenterX +circlueradius * Math.cos(CirclueAngleFirst * (Math.PI /180)));
circlueradius2 = circlueradius-dip2px(mContext,15);
EndY = (float) (mCenterY + circlueradius2 * Math.sin(CirclueAngleFirst * (Math.PI / 180)));
EndX =(float) ( mCenterX + circlueradius2 * Math.cos(CirclueAngleFirst * (Math.PI / 180)));
//if(mNewLine){
PaintLine mPaintLine = new PaintLine(StartX,StartY,EndX,EndY);
mArryPaintLine.add(mPaintLine);
//mPaintLine.start();
//}
}
}
class PaintLine extends Thread{
float paintStrokeWidth;
Paint paint;
float StartX;
float StartY;
float EndX;
float EndY;
int index = 180;
boolean mIsRun = false;
public PaintLine(float pStartX,float pStartY,float pEndX,float pEndY){
paint = new Paint();
paintStrokeWidth = dip2px(RotateView.mContext,3);
paint.setColor(Color.BLUE);
paint.setStrokeWidth(paintStrokeWidth);
paint.setAntiAlias(true);
StartX = pStartX;
StartY = pStartY;
EndX = pEndX;
EndY = pEndY;
}
/**
* 根据手机的分辨率从 dp 的单位 转成为 px(像素)
*/
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
@Override
public void run() {
mIsRun = true;
while(index>=0){
this.paint.setAlpha(index);
try {
PaintLine.this.sleep(25);
index = index-9;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
