闲来无事，做了一个简单的抽奖转盘的ui实现，供大家参考
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package com.microchange.lucky;
import android.content.context;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.graphics.rectf;
import android.util.attributeset;
import android.util.log;
import android.view.motionevent;
import android.view.view;
public class halfcircle extends view {
private paint paint;
private rectf oval;
private float startangle;
private float sweepspeed;
private float sweepangle;
boolean usecenter;
int count;// 等份
@override
protected void ondraw(canvas canvas) {
setsweepangle(count);
while (startangle <= 360) {
if (startangle % (count*3) == 0) {
paint.setcolor(color.blue);
} else if (startangle % (count*2) == 0){
paint.setcolor(color.green);
}else {
paint.setcolor(color.red);
}
log.e(""+startangle, paint.getcolor()+"");
canvas.drawarc(oval, startangle, sweepangle, usecenter, paint);
startangle += count;
}
float centerx = oval.centerx();
float centery = oval.centery();
paint.setcolor(color.white);
// paint.setstrokewidth(5);
// paint.setstyle(paint.style.stroke); //设置空心
paint.setantialias(true); //消除锯齿
canvas.drawcircle(centerx, centery, 50, paint);
string text = "奖";
paint.settextsize(20 * getcontext().getresources().getdisplaymetrics().density);
float measuretext = paint.measuretext(text);
float texty = paint.descent() - paint.ascent();
paint.setcolor(color.red);
// canvas.drawline(0, centery, 480, centery, paint);
// canvas.drawtext(text, centerx-(measuretext/2), centery, paint);
canvas.drawtext(text, centerx-(measuretext/2), centery+(texty/4), paint);
}
private void init() {
paint = new paint();
paint.setcolor(color.blue);
paint.setantialias(true);
paint.setstrokewidth(5);
}
@override
public boolean ontouchevent(motionevent event) {
return super.ontouchevent(event);
}
/**
* @return the count
*/
public int getcount() {
return count;
}
/**
* @param count the count to set
*/
public void setcount(int count) {
this.count = 360 / count;
}
public paint getpaint() {
return paint;
}
public void setpaint(paint paint) {
this.paint = paint;
}
public rectf getoval() {
return oval;
}
public void setoval(rectf oval) {
this.oval = oval;
}
public float getstartangle() {
return startangle;
}
public void setstartangle(float startangle) {
this.startangle = startangle;
}
public float getsweepspeed() {
return sweepspeed;
}
public void setsweepspeed(float sweepspeed) {
this.sweepspeed = sweepspeed;
}
public float getsweepangle() {
return sweepangle;
}
public void setsweepangle(float sweepangle) {
this.sweepangle = sweepangle;
}
public boolean isusecenter() {
return usecenter;
}
public void setusecenter(boolean usecenter) {
this.usecenter = usecenter;
}
public halfcircle(context context, attributeset attrs, int defstyle) {
super(context, attrs, defstyle);
init();
}
public halfcircle(context context, attributeset attrs) {
this(context, attrs, 0);
}
public halfcircle(context context) {
this(context, null, 0);
}
}
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package com.microchange.lucky;
import android.app.activity;
import android.graphics.rectf;
import android.os.bundle;
import android.view.animation.accelerateinterpolator;
import android.view.animation.animation;
import android.view.animation.decelerateinterpolator;
import android.view.animation.interpolator;
import android.view.animation.rotateanimation;
public class mainactivity extends activity {
rectf rect;
int radius = 300;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
halfcircle circle = new halfcircle(getapplicationcontext());
circle.setoval(getrectf());
// circle.setstartangle(90);
circle.setusecenter(true);
circle.setcount(9);
animation animation = new rotateanimation(0, 135*10, getrectf().centerx(), getrectf().centery());
animation.setduration(5000);
animation.setinterpolator(new decelerateinterpolator());
// animation.setrepeatcount(-1);
circle.setanimation(animation );
// animation.start();
setcontentview(circle);
}
public rectf getrectf(){
if (rect==null){
// getwindow().getdecorview().getwidth()
int width = getresources().getdisplaymetrics().widthpixels;
int height = getresources().getdisplaymetrics().heightpixels;
int top = (height - radius)/2;
int left = (width - radius)/2;
rect = new rectf(left, top, left+radius, top+radius);
}
return rect;
}
}
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希望本文所述对大家学习android程序设计有所帮助。