android实现刮刮卡

package com.example.scratch.view;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;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;import com.example.scratch.R;public class ScratchCardView extends View {/** * 自定义View实现刮刮卡 *//** * 绘制线条的Paint,即用户手指绘制Path */private Paint mOutterPaint = new Paint();/** * 记录用户绘制的Path */private Path mPath = new Path();/** * 内存中创建的Canvas */private Canvas mCanvas;/** * mCanvas绘制内容在其上 */private Bitmap mBitmap;/** * ------------------------以下是奖区的一些变量 */// private Bitmap mBackBitmap;private boolean isComplete;private Paint mBackPint = new Paint();private Rect mTextBound = new Rect();private String mText = "￥100,0000";private int mLastX;private int mLastY;public ScratchCardView(Context context) {this(context, null);}public ScratchCardView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public ScratchCardView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init();}private void init() {mPath = new Path();// mBackBitmap = BitmapFactory.decodeResource(getResources(),// R.drawable.t2);setUpOutPaint();setUpBackPaint();}/** * 初始化canvas的绘制用的画笔 */private void setUpBackPaint() {mBackPint.setStyle(Style.FILL);mBackPint.setTextScaleX(2f);mBackPint.setColor(Color.DKGRAY);mBackPint.setTextSize(32);mBackPint.getTextBounds(mText, 0, mText.length(), mTextBound);}@Overrideprotected void onDraw(Canvas canvas) {// canvas.drawBitmap(mBackBitmap, 0, 0, null);// 绘制奖项canvas.drawText(mText, getWidth() / 2 - mTextBound.width() / 2,getHeight() / 2 + mTextBound.height() / 2, mBackPint);if (!isComplete) {drawPath();canvas.drawBitmap(mBitmap, 0, 0, null);}}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int width = getMeasuredWidth();int height = getMeasuredHeight();// 初始化bitmapmBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);mCanvas = new Canvas(mBitmap);// 绘制遮盖层// mCanvas.drawColor(Color.parseColor("#c0c0c0"));mOutterPaint.setStyle(Paint.Style.FILL);mCanvas.drawRoundRect(new RectF(0, 0, width, height), 30, 30,mOutterPaint);mCanvas.drawBitmap(BitmapFactory.decodeResource(getResources(),R.drawable.s_title), null, new RectF(0, 0, width, height), null);}/** * 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(20);}/** * 绘制线条 */private void drawPath() {mOutterPaint.setStyle(Paint.Style.STROKE);mOutterPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));mCanvas.drawPath(mPath, mOutterPaint);}@Overridepublic 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;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;@Overridepublic 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 < w; i++) {for (int j = 0; j < h; j++) {int index = i + j * w;if (mPixels[index] == 0) {wipeArea++;}}}/** * 根据所占百分比，进行一些操作 */if (wipeArea > 0 && totalArea > 0) {int percent = (int) (wipeArea * 100 / totalArea);Log.e("TAG", percent + "");if (percent > 70) {Log.e("TAG", "清除区域达到70%，下面自动清除");isComplete = true;postInvalidate();}}}};}