示例代码_CheckView

``` java
package com.sloop.canvas;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

/**
*

*
• Author: Sloop

*
• Version: v1.0.0

*
• Copyright: Copyright (c) 2015

*
• Date: 2016/2/5

*
• 作者网站

*
• 作者微博

*
• 作者GitHub

*

*/
public class CheckView extends View {

private static final int ANIM_NULL = 0; //动画状态-没有
private static final int ANIM_CHECK = 1; //动画状态-开启
private static final int ANIM_UNCHECK = 2; //动画状态-结束

private Context mContext; // 上下文
private int mWidth, mHeight; // 宽高
private Handler mHandler; // handler

private Paint mPaint;
private Bitmap okBitmap;

private int animCurrentPage = -1; // 当前页码
private int animMaxPage = 13; // 总页数
private int animDuration = 500; // 动画时长
private int animState = ANIM_NULL; // 动画状态

private boolean isCheck = false; // 是否只选中状态

public CheckView(Context context) {
super(context, null);

}

public CheckView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}

/**
* 初始化
* @param context
*/
private void init(Context context) {
mContext = context;

mPaint = new Paint();
mPaint.setColor(0xffFF5317);
mPaint.setStyle(Paint.Style.FILL);
mPaint.setAntiAlias(true);

okBitmap = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.checkres);

mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (animCurrentPage < animMaxPage && animCurrentPage >= 0) {
invalidate();
if (animState == ANIM_NULL)
return;
if (animState == ANIM_CHECK) {

animCurrentPage++;
} else if (animState == ANIM_UNCHECK) {
animCurrentPage--;
}

this.sendEmptyMessageDelayed(0, animDuration / animMaxPage);
Log.e("AAA", "Count=" + animCurrentPage);
} else {
if (isCheck) {
animCurrentPage = animMaxPage - 1;
} else {
animCurrentPage = -1;
}
invalidate();
animState = ANIM_NULL;
}
}
};
}

/**
* View大小确定
* @param w
* @param h
* @param oldw
* @param oldh
*/
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mWidth = w;
mHeight = h;
}

/**
* 绘制内容
* @param canvas
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);

// 移动坐标系到画布中央
canvas.translate(mWidth / 2, mHeight / 2);

// 绘制背景圆形
canvas.drawCircle(0, 0, 240, mPaint);

// 得出图像边长
int sideLength = okBitmap.getHeight();

// 得到图像选区 和 实际绘制位置
Rect src = new Rect(sideLength * animCurrentPage, 0, sideLength * (animCurrentPage + 1), sideLength);
Rect dst = new Rect(-200, -200, 200, 200);

// 绘制
canvas.drawBitmap(okBitmap, src, dst, null);
}

/**
* 选择
*/
public void check() {
if (animState != ANIM_NULL || isCheck)
return;
animState = ANIM_CHECK;
animCurrentPage = 0;
mHandler.sendEmptyMessageDelayed(0, animDuration / animMaxPage);
isCheck = true;
}

/**
* 取消选择
*/
public void unCheck() {
if (animState != ANIM_NULL || (!isCheck))
return;
animState = ANIM_UNCHECK;
animCurrentPage = animMaxPage - 1;
mHandler.sendEmptyMessageDelayed(0, animDuration / animMaxPage);
isCheck = false;
}

/**
* 设置动画时长
* @param animDuration
*/
public void setAnimDuration(int animDuration) {
if (animDuration <= 0)
return;
this.animDuration = animDuration;
}

/**
* 设置背景圆形颜色
* @param color
*/
public void setBackgroundColor(int color){
mPaint.setColor(color);
}
}

```