android刮刮卡效果

//自定义控件代码package com.sutong.feihua.view;    import com.sutong.fangtao.R;  import com.sutong.feihua.wallet.GuaGua;    import android.annotation.SuppressLint;  import android.annotation.TargetApi;  import android.content.Context;  import android.graphics.Bitmap;  import android.graphics.Bitmap.Config;  import android.graphics.Paint.Align;  import android.graphics.Paint.Style;  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.os.Build;  import android.os.Handler;  import android.os.Message;  import android.support.v4.widget.SlidingPaneLayout.PanelSlideListener;  import android.util.AttributeSet;  import android.util.Log;  import android.view.MotionEvent;  import android.view.View;  public class GuaGuaKa extends View  {        /**      * 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 = "0";        private int mLastX;      private int mLastY;        public GuaGuaKa(Context context)      {          this(context, null);      }        public GuaGuaKa(Context context, AttributeSet attrs)      {          this(context, attrs, 0);      }        public GuaGuaKa(Context context, AttributeSet attrs, int defStyle)      {          super(context, attrs, defStyle);          init();      }        public void init()      {          mPath = new Path();          mBackBitmap = BitmapFactory.decodeResource(getResources(),                   R.drawable.a0m);          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(70);          mBackPint.getTextBounds(mText, 0, mText.length(), mTextBound);      }        @Override      protected 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);          }      }        @TargetApi(Build.VERSION_CODES.KITKAT) @SuppressLint("NewApi") @Override      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)      {          super.onMeasure(widthMeasureSpec, heightMeasureSpec);            int width = getMeasuredWidth();          int height = getMeasuredHeight();          // 初始化bitmap          mBitmap = 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);          //绘制灰色背景  //      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(50);      }        /**      * 绘制线条      */      private void drawPath()      {          mOutterPaint.setStyle(Paint.Style.STROKE);          mOutterPaint                  .setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));          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;              break;          case MotionEvent.ACTION_UP:              new Thread(mRunnable).start();              break;          }            invalidate();          return true;      }      //设置底部文字      public void setTitle(String title)      {          mText = title;      }      public void setBlackImg(int id)      {          mBackBitmap = BitmapFactory.decodeResource(getResources(),                   id);      }      /**      * 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 < 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 > 40)                  {                      Log.e("TAG", "清除区域达到70%，下面自动清除");                      System.out.println("清除区域达到70%，下面自动清除");                      isComplete = true;                      postInvalidate();                      Message message = new Message();                      message.what = 1;                      GuaGua.gua.handler.sendMessage(message);                  }              }          }        };  }
//xml代码
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