Android刮刮卡自定义控件

效果图

刮刮卡自定义控件

import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;/** * 描述： * 作者： shawn * 时间： 2024/5/2711:20 */public class ScratchView extends View {    /**     * 绘制线条的画笔     */    private Paint mOutterPaint = new Paint();    /**     * 遮层画笔     */    private Paint mMaskPaint = new Paint();    /**     * 最下面画笔     */    private Paint mBackPint = new Paint();    /**     * mCanvas绘制内容在其上     */    private Bitmap mBitmap;    /**     * 记录用户绘制的Path     */    private Path mPath = new Path();    /**     * 内存中创建的Canvas     */    private Canvas mCanvas;    private boolean isComplete;    private Rect mTextBound = new Rect();    private String mText = "￥500,0000";    private int mLastX;    private int mLastY;    private int measuredWidth;    private int measuredHeight;    public GuaGuaKaView(Context context) {        this(context, null);    }    public GuaGuaKaView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public GuaGuaKaView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init();    }    private void init() {        mPath = new Path();        setUpOutPaint();        setUpBackPaint();    }    /**     * 初始化canvas的绘制用的画笔     */    private void setUpBackPaint() {        mBackPint.setStyle(Paint.Style.FILL);        mBackPint.setTextScaleX(2f);        mBackPint.setColor(Color.DKGRAY);        mBackPint.setTextSize(32);        mBackPint.getTextBounds(mText, 0, mText.length(), mTextBound);    }    @Override    protected void onDraw(Canvas canvas) {        if (!isComplete) {            drawPath();            canvas.drawBitmap(mBitmap, 0, 0, null);        } else {            this.setVisibility(GONE);        }    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        measuredWidth = getMeasuredWidth();//宽高和父view的相同        measuredHeight = getMeasuredHeight();        // 初始化bitmap        mBitmap = Bitmap.createBitmap(measuredWidth, measuredHeight, Bitmap.Config.ARGB_8888);        mCanvas = new Canvas(mBitmap);        mMaskPaint.setColor(Color.parseColor("#000000"));//遮层透明        mMaskPaint.setStyle(Paint.Style.FILL);        mCanvas.drawRoundRect(new RectF(0, 0, measuredWidth, measuredHeight), 0, 0, mMaskPaint);//        mCanvas.drawBitmap(BitmapFactory.decodeResource(getResources(),//                R.drawable.bg_withdraw_history), null, new RectF(0, 0, measuredWidth, measuredHeight), null);//遮层    }    /**     * 设置画笔的一些参数     */    private void setUpOutPaint() {        // 设置画笔//         mOutterPaint.setAlpha(0);        mOutterPaint.setColor(Color.parseColor("#c0c0c0"));        mOutterPaint.setAntiAlias(true);        mOutterPaint.setDither(true);        mOutterPaint.setStyle(Paint.Style.STROKE);        mOutterPaint.setStrokeJoin(Paint.Join.ROUND); // 圆角        mOutterPaint.setStrokeCap(Paint.Cap.ROUND); // 圆角        // 设置画笔宽度        mOutterPaint.setStrokeWidth(50);    }    /**     * 绘制线条     */    private void drawPath() {        mOutterPaint.setStyle(Paint.Style.STROKE);        mOutterPaint                .setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));//取俩者的交集        mCanvas.drawPath(mPath, mOutterPaint);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        int action = event.getAction();        int x = (int) event.getX();        int y = (int) event.getY();        switch (action) {            case MotionEvent.ACTION_DOWN:                mLastX = x;                mLastY = y;                mPath.moveTo(mLastX, mLastY);                break;            case MotionEvent.ACTION_MOVE:                int dx = Math.abs(x - mLastX);                int dy = Math.abs(y - mLastY);                if (dx > 3 || dy > 3)                    mPath.lineTo(x, y);                mLastX = x;                mLastY = y;                new Thread(mRunnable).start();                break;            case MotionEvent.ACTION_UP:                new Thread(mRunnable).start();                break;        }        invalidate();        return true;    }    /**     * 统计擦除区域任务     */    private Runnable mRunnable = new Runnable() {        private int[] mPixels;        @Override        public void run() {            int w = getWidth();            int h = getHeight();            float wipeArea = 0;            float totalArea = w * h;            Bitmap bitmap = mBitmap;            mPixels = new int[w * h];            /**             * 拿到所有的像素信息             */            bitmap.getPixels(mPixels, 0, w, 0, 0, w, h);            /**             * 遍历统计擦除的区域             */            for (int i = 0; i  0 && totalArea > 0) {                int percent = (int) (wipeArea * 100 / totalArea);                Log.e("TAG", "清除区域 = " + percent);                if (percent > 75) {                    isComplete = true;                    postInvalidate();                }            }        }    };    /**     * 将布局转换成bitmap     * @param addViewContent     * @return     */    private Bitmap getViewBitmap(View addViewContent) {        addViewContent.setDrawingCacheEnabled(true);        addViewContent.measure(                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));        addViewContent.layout(0, 0,                addViewContent.getMeasuredWidth(),                addViewContent.getMeasuredHeight());        addViewContent.buildDrawingCache();        Bitmap cacheBitmap = addViewContent.getDrawingCache();        Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);        return bitmap;    }}

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