需求：
类似滴滴打车，呼叫车，但是司机还未接单，等待计时的自定义View
要达到的效果：
转圈圈.jpeg
用hongyang大神的自定义View教程中的思路实现的
相关代码：
1.attrs.xml(这个文件里放的是自定义view的属性)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<attr name="firstColor" format="color"/>
<attr name="secondColor" format="color"/>
<attr name="circleWidth" format="dimension"/>
<attr name="speed" format="integer"/>
<attr name="textSize" format="dimension"/>
<attr name="textColorFirst" format="color"/>
<attr name="textColorSecond" format="color"/>
<declare-styleable name="circle">
<attr name="firstColor"/>
<attr name="secondColor"/>
<attr name="circleWidth"/>
<attr name="speed"/>
<attr name="textSize"/>
<attr name="textColorFirst"/>
<attr name="textColorSecond"/>
</declare-styleable>
</resources>
2.自定义的View 我给它起名叫CircleView（反正就是个圆）
package weekimwee.cn.circleviewdemo;
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.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
/**
* Created by Wee Kim Wee on 2017/10/23.
*/
public class CircleView extends View {
private int firstColor;
private int secondColor;
private int circleWidth;
private int speed;
private int textSize;
private float progress;
private boolean isNext;
private String bigCircleText;
private int bigCircleTextColor;
private int time;
private DrawThread drawThread;
private SimpleDateFormat formatter = new SimpleDateFormat("mm分ss秒");
private final String LOADING ="已等待";
private Paint paint;
public CircleView(Context context) {
this(context,null);
}
public CircleView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}
public CircleView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.circle, defStyleAttr, 0);
int n = a.getIndexCount();
for(int i = 0; i < n; i++){
int attr = a.getIndex(i);
switch (attr){
case R.styleable.circle_firstColor:
firstColor = a.getColor(attr, Color.GRAY);
break;
case R.styleable.circle_secondColor:
secondColor = a.getColor(attr,Color.GRAY);
break;
case R.styleable.circle_circleWidth:
circleWidth = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_PX, 20, getResources().getDisplayMetrics()));
break;
case R.styleable.circle_speed:
speed=a.getInt(attr, 20);
break;
case R.styleable.circle_textSize:
textSize =a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
break;
case R.styleable.circle_textColorFirst:
bigCircleTextColor = a.getColor(attr,Color.BLACK);
break;
}
}
a.recycle();
bigCircleText = "00分00秒";
paint = new Paint();
drawThread = new DrawThread();
drawThread.start();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//大圆
int centre = getWidth() / 2; // 获取圆心的x坐标
int radius = (centre - circleWidth / 2)-25;// 半径
paint.setStrokeWidth(circleWidth); // 设置圆环的宽度
paint.setAntiAlias(true); // 消除锯齿
paint.setStyle(Paint.Style.STROKE); // 设置空心
RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius); // 用于定义的圆弧的形状和大小的界限
//跟着跑的小圆
float h = (float) (2*( Math.PI / 360) * progress);
float x = (float) ( radius+25+Math.sin(h) * radius);
float y = (float) (radius+25-Math.cos(h) * radius);
//在180度位置上的圆
//float hc = (float) (2*( Math.PI / 360) * 180);
//float xc = (float) ( radius+25+Math.sin(hc) * radius);
//float yc = (float) (radius+25-Math.cos(hc) * radius);
//大圆边框绘制颜色
if (!isNext) {// 第一颜色的圈完整，第二颜色跑
paint.setColor(firstColor); // 设置圆环的颜色
canvas.drawCircle(centre, centre, radius, paint); // 画出圆环
paint.setColor(secondColor); // 设置圆环的颜色
canvas.drawArc(oval, -90, progress, false, paint); // 根据进度画圆弧
paint.setColor(secondColor);
paint.setStyle(Paint.Style.FILL);
canvas.drawCircle(x,y,10,paint);
//paint.setColor(firstColor);
//paint.setStyle(Paint.Style.FILL);
//canvas.drawCircle(xc,yc,10,paint);
} else {
paint.setColor(secondColor); // 设置圆环的颜色
canvas.drawCircle(centre, centre, radius, paint); // 画出圆环
paint.setColor(firstColor); // 设置圆环的颜色
canvas.drawArc(oval, -90, progress, false, paint); // 根据进度画圆弧
paint.setColor(firstColor);
paint.setStyle(Paint.Style.FILL);
canvas.drawCircle(x,y,8,paint);
//paint.setColor(secondColor);
//paint.setStyle(Paint.Style.FILL);
//canvas.drawCircle(xc,yc,10,paint);
}
paint.setTextSize(textSize);
//已等待
float loadingTextWidth = paint.measureText(LOADING);
paint.setColor(Color.GRAY);
paint.setStrokeWidth(1);
canvas.drawText(LOADING,centre-loadingTextWidth/2,centre-textSize,paint);
//几分几秒
float bigCircleTextWidth = paint.measureText(bigCircleText);
paint.setColor(bigCircleTextColor);
canvas.drawText(bigCircleText, centre - bigCircleTextWidth / 2, centre + textSize , paint);
}
public void stop(){
drawThread.close();
}
class DrawThread extends Thread {
private boolean isRun = true;
@Override
public void run() {
while (isRun) {
BigDecimal b1 = new BigDecimal(Float.toString(progress));
BigDecimal b2 = new BigDecimal(Float.toString(0.3f));
progress = b1.add(b2).floatValue();
if (progress == 360) {
progress = 0;
if (!isNext)
isNext = true;
else
isNext = false;
}
time = time+speed;
postInvalidate();
bigCircleText = formatter.format(time);
try {
Thread.sleep(speed);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public void close() {
isRun = false;
}
}
}
3.activity_main.xml布局中使用上述View
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="weekimwee.cn.circleviewdemo.MainActivity">
<TextView
android:layout_alignParentTop="true"
android:padding="20dp"
android:id="@+id/helloworld"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
<weekimwee.cn.circleviewdemo.CircleView
android:id="@+id/view"
android:layout_centerInParent="true"
android:layout_width="200dp"
android:layout_height="200dp"
app:firstColor="#ff4500"
app:secondColor="#d3d3d3"
app:circleWidth="2dp"
app:speed="25"
app:textSize="20sp"
app:textColorFirst ="#ff4500"
app:textColorSecond="#d3d3d3"
/>
</RelativeLayout>
4.MainActivity.java中使用View开始计时
package weekimwee.cn.circleviewdemo
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
helloworld.setOnClickListener {
view.stop()
}
}
}
实现思路：
必要条件：
- 空心大圆，两种颜色
- 实心的小圆，也是两种颜色
- 计时线程，30秒小圆要绕着大圆走一圈并更换颜色，大圆中间的text显示计时
具体代码中的实现：
- 在构造方法中把属性获取下来
- 计时的线程开始启动，线程中的逻辑：
360度的大圆，每25毫秒转0.3f度，转1200次刚好转完，刚好30秒（因为我没有用动画，直接是在View中重绘的，如果是3度这样的，会显的一卡一卡的不平滑）- onDraw方法：
（1）先画大圆（大圆位置是固定的）
（2）计算小圆的位置（每次重绘角度已经变了，所以要重新计算小圆的位置）
（3）大圆边框绘制颜色，以及绘制小圆（小圆颜色与大圆边框一致）
（4）绘制大圆中间的字- stop方法
这个方法供外部调用停止计时线程，例如呼叫到车了，这个页面finish了之类的
以上是这个呼叫车计时等待View的笔记，demo在这里在这里！
