自定义view之刮刮乐

package com.bwie.chentong.guaguale;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.BitmapFactory;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.util.TypedValue;import android.view.MotionEvent;import android.view.View;/** * Created by lenovo on 2017/9/28. */public class GuaGuaView extends View{    private String mText;    private Rect mTextRect;    private Paint mTextPaint;    private int mTextSize;    private int mTextColor;    private Paint mTopPaint;    private Bitmap topBitmap;    private Canvas mCanvas;    //手指的路径    private Path mPath;    //手指上次停留的位置    private float mLastX;    private float mLastY;    private volatile boolean mIsComplete = false;    private OnGuaGuaCompleteListener onGuaGuaCompleteListener;    private PorterDuffXfermode porterDuffXfermode;    public void setOnGuaGuaCompleteListener(OnGuaGuaCompleteListener onGuaGuaCompleteListener) {        this.onGuaGuaCompleteListener = onGuaGuaCompleteListener;    }    /**     * 抬起手指时，若刮开区域大于阈值，给用户提示     */    public interface OnGuaGuaCompleteListener {        void onComplete();    }    public GuaGuaView(Context context) {        this(context, null);    }    public GuaGuaView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public GuaGuaView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();        TypedArray typedArray = null;        try {            typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.GuaGuaView, defStyleAttr, 0);            int indexCount = typedArray.getIndexCount();            for (int i = 0; i < indexCount; i++) {                int attr = typedArray.getIndex(i);                switch (attr) {                    case R.styleable.GuaGuaView_text:                        mText = typedArray.getString(attr);                        break;                    case R.styleable.GuaGuaView_textSize:                        //22sp转化为像素值                        mTextSize = (int) typedArray.getDimension(attr,                                TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 22, getResources().getDisplayMetrics()));                        break;                    case R.styleable.GuaGuaView_textColor:                        mTextColor = typedArray.getColor(attr, 0x000000);                        break;                }            }            mTextPaint.setColor(mTextColor);            mTextPaint.setTextSize(mTextSize);        } finally {            if (typedArray != null)                typedArray.recycle();        }    }    private void init() {        porterDuffXfermode = new PorterDuffXfermode(PorterDuff.Mode.DST_OUT);        mText = "谢谢惠顾";        mTextRect = new Rect();        mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 22, getResources().getDisplayMetrics());        mTextPaint.setStyle(Paint.Style.STROKE);        mTopPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mTopPaint.setColor(Color.parseColor("#c0c0c0"));        mTopPaint.setStyle(Paint.Style.FILL);        mTopPaint.setDither(true);        mTopPaint.setStrokeCap(Paint.Cap.ROUND);        mTopPaint.setStrokeJoin(Paint.Join.ROUND);        mTopPaint.setStrokeWidth(30);        mPath = new Path();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //获得文本的边界信息        mTextPaint.getTextBounds(mText, 0, mText.length(), mTextRect);        canvas.drawText(mText, getWidth() / 2 - mTextRect.width() / 2, getHeight() / 2 + mTextRect.height() / 2, mTextPaint);        if (!mIsComplete) {            mTopPaint.setStyle(Paint.Style.STROKE);            //只在源图像和目标图像相交的地方绘制透明            mTopPaint.setXfermode(porterDuffXfermode);            mCanvas.drawPath(mPath, mTopPaint);            //还原混合模式            mTopPaint.setXfermode(null);            canvas.drawBitmap(topBitmap, 0, 0, null);        } else {            if (onGuaGuaCompleteListener != null) {                onGuaGuaCompleteListener.onComplete();            }        }    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                mLastX = event.getX();                mLastY = event.getY();                mPath.moveTo(event.getX(), event.getY());                break;            case MotionEvent.ACTION_MOVE:                float dx = Math.abs(event.getX() - mLastX);                float dy = Math.abs(event.getY() - mLastY);                //手指移动的距离过小，不擦除                if (dx > 5 || dy > 5) {                    mLastX = event.getX();                    mLastY = event.getY();                    mPath.lineTo(mLastX, mLastY);                }                if (!mIsComplete) {                    invalidate();                }                break;            case MotionEvent.ACTION_UP:                if (!mIsComplete) {                    new Thread(mRunnable).start();                }                break;        }        return true;    }    private Runnable mRunnable = new Runnable() {        @Override        public void run() {            int width = getWidth();            int height = getHeight();            int[] pixels = new int[width * height];            float wipeArea = 0;            float totalArea = width * height;            /**             * getPixels()函数把一张图片，从指定的偏移位置（offset），指定的位置（x,y）截取指定的宽高（width,height）             * 把所得图像的每个像素颜色转为int值，存入pixels。             * stride 参数指定在行之间跳过的像素的数目。图片是二维的，存入一个一维数组中，那么就需要这个参数来指定多少个像素换一行。             * 详见：http://blog.csdn.net/xx326664162/article/details/52240795             */            topBitmap.getPixels(pixels, 0, width, 0, 0, width, height);            for (int i = 0; i < width; i++) {                for (int j = 0; j < height; j++) {                    int index = i + j * width;                    if (pixels[index] == 0) {                        wipeArea++;                    }                }            }            float progress = wipeArea / totalArea;            Log.d("test", "progress-----" + progress);            if (progress > 0.6) {                mIsComplete = true;                postInvalidate();            }        }    };    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        topBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);        mCanvas = new Canvas(topBitmap);        Bitmap bottomBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.timg6);        //将图片以合适比例显示        //先画灰色背景，再画图片        mCanvas.drawRoundRect(new RectF(0, 0, w, h), 50, 50, mTopPaint);        /**         * bitmap 要绘制的位图对象         * src 要裁切的位置，若是null则显示整张图片         * dst 裁切后的图片显示的区域         * paint 画笔         */        mCanvas.drawBitmap(bottomBitmap, null, new RectF(0, 0, w, h), null);    }    //设置中奖信息    public void setText(String mText) {        this.mText = mText;    }}