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好久没有写博客了，趁着年末，总结了下最近一年所遇到的一些技术问题，还有一些自定义控件，比如倒计时功能
首先倒计时的实现方式
1.handler
2.timer
3.rxjava
4.valueanimator
5.其他
这些方式中，我选择了valueanimator,主要是它的api比较友好，不需要我们去封装太多东西,具体的使用方式我就不单独写了，下面的代码都有备注
项目图片
代码实现：
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package com.example.countdownview;
import android.animation.animator;
import android.animation.animatorlisteneradapter;
import android.animation.valueanimator;
import android.content.context;
import android.content.res.typedarray;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.graphics.rectf;
import android.util.attributeset;
import android.view.view;
import android.view.animation.linearinterpolator;
public class countdownview extends view {
//圆轮颜色
private int mringcolor;
//圆轮宽度
private float mringwidth;
//宽度
private int mwidth;
//高度
private int mheight;
private paint mpaint;
//圆环的矩形区域
private rectf mrectf;
//
private int mcountdowntime;
private float mcurrentprogress;
private oncountdownfinishlistener mlistener;
valueanimator valueanimator;
public countdownview(context context) {
this(context, null);
}
public countdownview(context context, attributeset attrs) {
this(context, attrs, 0);
}
public countdownview(context context, attributeset attrs, int defstyleattr) {
super(context, attrs, defstyleattr);
typedarray a = context.obtainstyledattributes(attrs, r.styleable.countdownview);
mringcolor = a.getcolor(r.styleable.countdownview_ringcolor, color.red);
mcountdowntime = a.getinteger(r.styleable.countdownview_countdowntime, 10);
mringwidth=a.getdimension(r.styleable.countdownview_ringwidth,2);
a.recycle();
mpaint = new paint(paint.anti_alias_flag);
/**
*圆环
*/
//颜色
mpaint.setcolor(mringcolor);
//空心
mpaint.setstyle(paint.style.stroke);
mpaint.setantialias(true); // 消除锯齿
//宽度
mpaint.setstrokewidth(mringwidth);
}
public void setcountdowntime(int mcountdowntime) {
this.mcountdowntime = mcountdowntime;
}
@override
protected void onlayout(boolean changed, int left, int top, int right, int bottom) {
super.onlayout(changed, left, top, right, bottom);
mwidth = getmeasuredwidth();
mheight = getmeasuredheight();
mrectf = new rectf(0 + mringwidth / 2, 0 + mringwidth / 2,
mwidth - mringwidth / 2, mheight - mringwidth / 2);
}
@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
canvas.drawarc(mrectf, -90, mcurrentprogress, false, mpaint);
}
private valueanimator getvala(long countdowntime) {
valueanimator valueanimator = valueanimator.offloat(0, 100);
valueanimator.setduration(countdowntime);
valueanimator.setinterpolator(new linearinterpolator());
valueanimator.setrepeatcount(0);
return valueanimator;
}
/**
* 开始倒计时
*/
public void startcountdown() {
setclickable(false);
valueanimator = getvala(mcountdowntime * 1000);
//状态更新监听
valueanimator.addupdatelistener(new valueanimator.animatorupdatelistener() {
@override
public void onanimationupdate(valueanimator animation) {
float i = float.valueof(string.valueof(animation.getanimatedvalue()));
mcurrentprogress = (int) (360 * (i / 100f));
invalidate();
}
});
valueanimator.start();
//状态变化结束监听
valueanimator.addlistener(new animatorlisteneradapter() {
@override
public void onanimationend(animator animation) {
super.onanimationend(animation);
//倒计时结束回调
if (mlistener != null) {
mlistener.countdownfinished();
}
setclickable(true);
}
});
}
/**
* 恢复
*/
public void resumecountdown(){
if (valueanimator!=null){
valueanimator.resume();
}
}
/**
* 暂停
*/
public void pausecountdown(){
if (valueanimator!=null){
valueanimator.pause();
}
}
/**
* 停止倒计时
*/
public void stopcountdown(){
if (valueanimator!=null){
valueanimator.cancel();
}
}
public void setcountdownfinishlistener(oncountdownfinishlistener mlistener) {
this.mlistener = mlistener;
}
public interface oncountdownfinishlistener {
void countdownfinished();
}
}
总结
以上所述是小编给大家介绍的android倒计时功能的实现代码，希望对大家有所帮助
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