Android 自定义View 刮刮乐—呱奖

/**

 *

 * 转载请标明出处：http://blog.csdn.net/u013598111/article/details/50411760

 *   @author：【JunTao_sun】
 *

 *

*/



package com.example.guagua;

import android.content.Context;
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.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class GuaguaKaView extends View {
private Paint mPaint, mTPaint;
private Rect mbound = new Rect();
private Bitmap mBitmap;
private Path mPath;
private Bitmap mHongbao;
private Canvas mCanvas;

public GuaguaKaView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
// TODO Auto-generated constructor stub
}

public GuaguaKaView(Context context) {
super(context, null);
// TODO Auto-generated constructor stub
}

private Context mContext;

public GuaguaKaView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);

mContext = context;
//初始化画笔
initPaint();
//初始化path
initPath();
//初始化图片资源
setUpBitmap();

}

private void initPaint() {
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setDither(true);
mPaint.setStrokeWidth(15);
mPaint.setStrokeJoin(Paint.Join.ROUND);
// mPaint.setColor(0xaa0000ff);

mTPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mTPaint.setStyle(Paint.Style.FILL);
mTPaint.setStrokeCap(Paint.Cap.ROUND);
mTPaint.setDither(true);
mTPaint.setColor(0xaaff0000);
mTPaint.setTextSize(30);
measureText();

}

private void setUpBitmap() {
//先绘制dst 再设置xfermode 最后绘制src
mBitmap = BitmapFactory.decodeResource(mContext.getResources(),
R.drawable.hongbao);
mHongbao = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(),
Config.ARGB_8888);
mCanvas = new Canvas(mHongbao);
mCanvas.drawColor(Color.parseColor("#c0c0c0"));
mCanvas.drawBitmap(mBitmap, 0, 0, null);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.AT_MOST) {
widthMeasureSpec = MeasureSpec.makeMeasureSpec(mHongbao.getWidth(),
MeasureSpec.AT_MOST);
}
if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(
mHongbao.getHeight(), MeasureSpec.AT_MOST);
}

super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

private void initPath() {
mPath = new Path();

}

private String text = "1000.000万元";

void measureText() {
mTPaint.getTextBounds(text, 0, text.length(), mbound);

}

@Override
protected void onDraw(Canvas canvas) {
canvas.drawText(text, getWidth() / 2 - mbound.width() / 2, getHeight()
/ 2 + mbound.height() / 2, mTPaint);
if (mComplete)
return;
drawPath();

canvas.drawBitmap(mHongbao, 0, 0, null);

}

/**
* 设置Xfermode 模式 PorterDuff.Mode.DST_OUT 取下层绘制非交集部分
*/
private void drawPath() {

mPaint.setXfermode(new PorterDuffXfermode(Mode.DST_OUT));
mCanvas.drawPath(mPath, mPaint);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
int x = (int) event.getX();
int y = (int) event.getY();
int downx = 0;
int downy = 0;
switch (action) {
case MotionEvent.ACTION_DOWN:
downx = x;
downy = y;

mPath.moveTo(downx, downy);
break;

case MotionEvent.ACTION_MOVE:
int distanceX = x - downx;
int distanceY = x - downy;
//当触摸超过距离5的时候才刮
if (Math.abs(distanceX) > 5 || Math.abs(distanceY) > 5) {

mPath.lineTo(x, y);
invalidate();
}
downx = x;
downy = y;
break;
case MotionEvent.ACTION_UP:
cheakArea();
break;
}

return true;
}

private boolean mComplete = false;

private void cheakArea() {
new Thread(new Runnable() {
int w = mHongbao.getWidth();
int h = mHongbao.getHeight();
//红包的像素总合
int HBATotolrea = w * h;
//存储图片像素点的值
int[] mHongbaoArea = new int[HBATotolrea];
//当前面积
int mCurArea;
private String TAG;

@Override
public void run() {
//得到每个像素的值
mHongbao.getPixels(mHongbaoArea, 0, w, 0, 0, w, h);
for (int i = 0; i < w; i++) {
for (int j = 0; j < h; j++) {
int index = w * i + j;
if (mHongbaoArea[index] == 0) {
mCurArea += 1;

}

}

int a = mCurArea * 100 / HBATotolrea;

//当刮到大于60%的时候 就显示结果
if (a > 60) {
mComplete = true;
}

}

}

}).start();

}