示例代码_CheckView about androidnote HOT 31 OPEN

if (animCurrentPage < animMaxPage && animCurrentPage >= 0) {
    if (animState == ANIM_NULL)
        return;
    if (animState == ANIM_CHECK) {
        animCurrentPage++;
    } else if (animState == ANIM_UNCHECK) {
        animCurrentPage--;
    }
    //animCurrentPage为animMaxPage不需要更新，否则下面的else会导致绘制前一张图闪一下
    if (animCurrentPage != animMaxPage) {
        invalidate();
    }
    this.sendEmptyMessageDelayed(0, animDuration / animMaxPage);
} else {
    if (isCheck) {
        animCurrentPage = animMaxPage - 1;
    } else {
        animCurrentPage = -1;
    }
    invalidate();
    animState = ANIM_NULL;
}

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

public CheckView(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    init(context,attrs);
}
private void init(Context context, @Nullable AttributeSet attrs){
    mPaint=new Paint();
    mPaint.setColor(Color.YELLOW);
    mPaint.setStyle(Paint.Style.FILL);
    mPaint.setAntiAlias(true);
    okBitmap= BitmapFactory.decodeResource(context.getResources(),R.drawable.check_mark);
    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++;
                    Log.e(TAG, "handleMessage: 当前页面"+animCurrentPage );
                }else if (animState==ANIM_UNCHECK){
                    animCurrentPage--;
                }

                this.sendEmptyMessageDelayed(0,animDuration/animMaxPage);
            }else {
                if (isCheck){
                    animCurrentPage=animMaxPage-1;
                }else {
                    animCurrentPage=-1;
                }
                //TODO:这里不需要重绘了，当前页面减一页会导致onDraw()方法多执行一边造成页面回退，出现闪烁现象

}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    mWidth=w;
    mHeight=h;

}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.translate(mWidth/2,mHeight/2);
    canvas.drawCircle(0,0,240,mPaint);
    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(-150, -150, 150, 150);
    Log.e(TAG, "onDraw: 绘制区域："+sideLength * animCurrentPage+"    "+0+"   "+sideLength * (animCurrentPage + 1)+"   "+sideLength );


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


}

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

/**
 * 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;
}

public void setDuration(int duration){
    if (duration<=0){
        return;
    }else {
        this.animDuration=duration;
    }
}
public void setBackGroundColor(int color){
    mPaint.setColor(color);
}

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;

private Paint mPaint;
private int mWidth, mHeight;//宽高
private Handler handler;
private Bitmap okBitmap;

private int currentPage = -1;//当前页数
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) {
    this(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.checkmark);

    handler = 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--;
                }
                invalidate();
                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);
    Log.e("llx", "onDraw()--");
    // 移动坐标系到画布**
    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;
    handler.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;
    handler.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);
}

 // 指定图片绘制区域
Rect src = new Rect(sideLength * animCurrentPage, 0, sideLength * (animCurrentPage + 1), sideLength);
// 指定图片在屏幕上显示的区域
Rect dst = new Rect(-200, -200, 200, 200);
 // 绘制
canvas.drawBitmap(okBitmap, src, dst, null);

    canvas.translate((mWidth / 2).toFloat(), (mHeight / 2).toFloat())

    // 得出图像边长
    val sideLength = okBitmap!!.height

    canvas.drawCircle(0f, 0f, (sideLength / 2 + 20).toFloat(), mPaint)

    // 算出图片每次需要截取的长度
    var right = sideLength / animMaxPage * animCurrentPage
    if (right > sideLength) right = sideLength

    // 算出绘制框需要显示的长度,因为是从中间点左边负的图片边长的一半加上每次变换的值
    var bRight = (0 - sideLength) / 2 + (sideLength / animMaxPage * animCurrentPage)
    if (bRight > sideLength / 2) bRight = sideLength / 2

    // 从图片的顶部坐标0,左边坐标0,底部坐标图片的长度,右边坐标是截取的长度
    val src = Rect(0, 0, right, sideLength)
    // 由于已经移动到屏幕的中间点,所以显示的区域是从中间点开始,顶部的坐标是负的图片边长的一半,底部坐标也是边长的一半
    // 左边坐标也是负的图片边长的一半,右边坐标是上面算出的长度
    val dst = Rect((0 - sideLength) / 2, (0 - sideLength) / 2, bRight, sideLength / 2)

    canvas.drawBitmap(okBitmap, src, dst, null)
}