项目要求做一个这样子的gif
View的代码是
package com.example;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.RectF;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
/**
* 默认是浅绿色
* @author lq
*
*/
public class TimerCountdownView extends View {
int mMaxSeconds = 0 ;
float mRateAngle = 0 ;
private float mMaxAngle = 0;
/**外圈相关**/
private float mOutCircleWidth = 2;
private int mOutCircleColor = 0xff01BCB3;
//起始角度
private float mOutStartAngle = 145;
//扫描角度
private float mOutSweepAngle = 250;
/**内圈相关**/
private float mInCircleWidth = 10;
private int mInCircleColor = 0xffF5F5F5;
//起始角度
private float mInStartAngle = 145;
//扫描角度
private float mInSweepAngle = 250;
/**外圈与内圈的距离**/
private float mOutAndInPadding = 12; //外援环和小圆环虹之间的间隔
//发起重回命令
private int mActionHeartbeat = 1 ;
//间隔时间
private int mDelayTime = 1 * 1000 ;
private CountdownTimerListener mListener ;
public TimerCountdownView(Context context, AttributeSet attrs) {
super(context, attrs);
}
private Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
if(msg.what == mActionHeartbeat){
mMaxAngle = mMaxAngle - mRateAngle;
mMaxSeconds = mMaxSeconds - 1;
if (mMaxSeconds >= 0) {
invalidate();
mHandler.sendEmptyMessageDelayed(mActionHeartbeat,mDelayTime);
if(mListener!=null){
mListener.onCountDown(showTheTimer(mMaxSeconds));
mListener.onTimeArrive(false);
}
// Log.d("", "剩余"+mMaxSeconds+"秒" +" 剩余角度："+mMaxAngle);
}else{
mListener.onTimeArrive(true);
}
}
};
};
public void updateView(){
mHandler.sendEmptyMessage(mActionHeartbeat);
}
public void destroy(){
mHandler.removeMessages(100);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawInCircle(canvas);
drawOutCircle(canvas);
}
public void drawInCircle(Canvas canvas){
Paint paint = new Paint();
paint.setColor(mInCircleColor);
paint.setAntiAlias(true);
paint.setStyle(Style.STROKE);
paint.setStrokeWidth(mInCircleWidth);
float left = mOutAndInPadding + mOutCircleWidth;
float top = left;
float right = getWidth() - left;
float bottom = getHeight() - top;
RectF oval = new RectF(left, top, right, bottom);
canvas.drawArc(oval, mInStartAngle, mInSweepAngle, false, paint);
}
public void drawOutCircle(Canvas canvas){
Paint paint = new Paint();
paint.setColor(mOutCircleColor);
paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
paint.setStrokeWidth(mOutCircleWidth);
float left = 1;
float top = left;
float right = getWidth() - left;
float bottom = getHeight()- top;
RectF oval = new RectF(left+mOutCircleWidth, top+mOutCircleWidth, right-mOutCircleWidth, bottom-mOutCircleWidth);
canvas.drawArc(oval, mOutStartAngle,mMaxAngle , false, paint);
}
/**
* 设置初始最大时间
* @param minute 单位分
*/
public void setMaxTime(int minute){
mMaxAngle = mOutSweepAngle ;
mMaxSeconds = minute * 60 ;
mRateAngle = mMaxAngle / mMaxSeconds ;
}
public void setOutCicleColor(int color){
mOutCircleColor = color ;
}
public void setOutCicleWidth(int width){
mOutCircleWidth = width ;
}
public void setInCicleColor(int color){
mInCircleColor = color;
}
public void setInCicleWidth(int width){
mInCircleWidth = width;
}
public void setOuterAndInerPadding(int padding){
mOutAndInPadding = padding ;
}
public String showTheTimer(int seconds){
String timer = "";
String sminute = "";
String ssecond = "";
if(seconds>=0){
int minute = seconds / 60 ;
int second = seconds % 60 ;
if(minute<10){
sminute = "0"+minute+":";
}else{
sminute = minute+":" ;
}
if(second<10){
ssecond = "0"+second;
}else{
ssecond = second+"" ;
}
timer = sminute + ssecond;
}else{
timer = "00:00";
}
return timer ;
}
public interface CountdownTimerListener{
//当前倒计时计算的文本 格式 mm-ss
public void onCountDown(String time);
//倒计时是否到达
public void onTimeArrive(boolean isArrive);
}
public void addCountdownTimerListener(CountdownTimerListener listener){
mListener = listener ;
}
}
xml代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/white" >
<com.example.TimerCountdownView android:id="@+id/view2"
android:layout_width="120dip"
android:layout_height="120dip"
android:layout_centerInParent="true"/>
<TextView android:id="@+id/timer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="#01BCB3"
android:textSize="30sp"
android:text="00:00"/>
<TextView android:id="@+id/timer_hint"
android:layout_below="@+id/timer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="#cccccc"
android:textSize="13sp"
android:layout_marginBottom="10dip"
android:text="/分钟\n倒计时"/>
</RelativeLayout>package com.example;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import com.example.TimerCountdownView.CountdownTimerListener;
import com.example.circleprogressbar.R;
public class SimpleActivity extends Activity {
private Context mContext;
TimerCountdownView view ;
TextView mTimer ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_base);
mContext =this;
view = (TimerCountdownView) findViewById(R.id.view2);
mTimer = (TextView) findViewById(R.id.timer);
view.setMaxTime(1);
view.updateView();
view.addCountdownTimerListener(litener);
}
CountdownTimerListener litener = new CountdownTimerListener() {
@Override
public void onCountDown(String time) {
mTimer.setText(time);
}
@Override
public void onTimeArrive(boolean isArrive) {
if(isArrive){
Toast.makeText(mContext, "时间到", Toast.LENGTH_SHORT).show();
}
}
};
}
原文地址：http://blog.csdn.net/xxxiu/article/details/43272653
