android实现刮奖的效果

突发奇想，实现类似于刮彩票的效果，于是完成了一个小例子，其中有不完善的地方，比如判断彩票是否中奖是以是否刮彩票3次判断的，而不是以面积来计算的。

核心部分是借鉴网上代码的，不过找不到源地址了。

示例图：



代码如下：

ErnieActivity类：

public class ErnieActivity extends Activity{
Button erniebtn;
RelativeLayout container;
ErinieShow erinieShow;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

erniebtn=(Button) findViewById(R.id.erniebtn);
container=(RelativeLayout) findViewById(R.id.container);

erniebtn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showErnie();
}
});

}

private void showErnie(){
// container
container.removeAllViews();

int level = getLevel();
erinieShow=new ErinieShow(this, level);

container.addView(erinieShow,new LayoutParams(-2,-2));
}

/**
* 获取奖励等级
* @return
*/
public int getLevel(){
//随机，看看几等奖
double d=Math.random()*100;
if(d<50){
return 0;
}
if(d<80){
return 3;
}
if(d<95){
return 2;
}
return 1;

}

@Override
protected void onDestroy() {
super.onDestroy();
}

}

ErinieShow类：

public class ErinieShow extends RelativeLayout {
Context context;
RelativeLayout rubblerBG;
RubblerShow rubblerShow;
Button getReward;

int rubblerBGId = 10001;
int getRewardId = 10002;

int level;

public ErinieShow(Context context, int level) {
super(context);
this.context = context;
this.level = level;
getElement();
setElementLP();
setElementStyle();
setElement();
}

private void getElement() {
rubblerBG = new RelativeLayout(context);
rubblerShow = new RubblerShow(context,handler);
getReward = new Button(context);

rubblerBG.setId(rubblerBGId);
getReward.setId(getRewardId);
rubblerBG.addView(rubblerShow);
addView(rubblerBG);
addView(getReward);
}

private void setElementLP() {
int[] resolution = PhoneUtil.getResolution(context);
RelativeLayout.LayoutParams rubblerBG_LP = new RelativeLayout.LayoutParams(
resolution[0], PhoneUtil.getFitHeight(context, 125));

rubblerBG.setLayoutParams(rubblerBG_LP);
rubblerShow.setLayoutParams(rubblerBG_LP);

RelativeLayout.LayoutParams getReward_LP = new LayoutParams(-2, -2);
getReward_LP.addRule(RelativeLayout.CENTER_HORIZONTAL);
getReward_LP.addRule(RelativeLayout.BELOW,rubblerBGId);
getReward.setLayoutParams(getReward_LP);

}

private void setElementStyle() {
switch (level) {
case 0:
rubblerBG.setBackgroundResource(R.drawable.rewardlevel0);

break;
case 1:
rubblerBG.setBackgroundResource(R.drawable.rewardlevel1);

break;
case 2:
rubblerBG.setBackgroundResource(R.drawable.rewardlevel2);
break;
default:
rubblerBG.setBackgroundResource(R.drawable.rewardlevel3);
break;
}
// getReward.setBackgroundResource(R.drawable.get_award);
}

private void setElement() {
rubblerShow.beginRubbler(Color.parseColor("#d3d3d3"), 30, 10);

getReward.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
if(level==0){
Toast.makeText(context, "很遗憾，此次未中奖，再接再厉吧！", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(context, "恭喜您，获得了"+level+"等奖。", Toast.LENGTH_SHORT).show();
}
}
});
//先设置为不可点击
getReward.setClickable(false);

getReward.setText("领奖");
}

Handler handler=new Handler(){

@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if(msg.what==200){
getReward.setClickable(true);
}else{

}

}

};

}


RubblerShow类：
public class RubblerShow extends TextView {

private float TOUCH_TOLERANCE; // 填充距离，使线条更自然，柔和,值越小，越柔和。

// private final int bgColor;

private Bitmap mBitmap;
private Canvas mCanvas;
private Paint mPaint;
private Path mPath;
private float mX, mY;

private boolean isDraw = false;

Handler handler;
int time=0;

public RubblerShow(Context context, Handler handler) {
super(context);
this.handler=handler;
// bgColor =
// attrs.getAttributeIntValue("http://schemas.android.com/apk/res/android",
// "textColor", 0xFFFFFF);
// System.out.println(bgColor);
// System.out.println(attrs.getAttributeValue("http://schemas.android.com/apk/res/android",
// "layout_width"));
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (isDraw) {
mCanvas.drawPath(mPath, mPaint);
// mCanvas.drawPoint(mX, mY, mPaint);
canvas.drawBitmap(mBitmap, 0, 0, null);
}
}

/**
* 开启檫除功能
*
* @param bgColor
* 覆盖的背景颜色
* @param paintStrokeWidth
* 触点（橡皮）宽度
* @param touchTolerance
* 填充距离,值越小，越柔和。
*/
public void beginRubbler(final int bgColor, final int paintStrokeWidth,
float touchTolerance) {
TOUCH_TOLERANCE = touchTolerance;
// 设置画笔
mPaint = new Paint();
// mPaint.setAlpha(0);
// 画笔划过的痕迹就变成透明色了
mPaint.setColor(Color.BLACK); // 此处不能为透明色
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
// 或者
// mPaint.setAlpha(0);
// mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));

mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND); // 前圆角
mPaint.setStrokeCap(Paint.Cap.ROUND); // 后圆角
mPaint.setStrokeWidth(paintStrokeWidth); // 笔宽

// 痕迹
mPath = new Path();
// 覆盖
LayoutParams layoutParams = getLayoutParams();
int height = layoutParams.height;
int width;
if (getLayoutParams().width == LayoutParams.MATCH_PARENT) {
width = 700;
} else {
width = layoutParams.width;
}

mBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);

mCanvas.drawColor(bgColor);
isDraw = true;
}

@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isDraw) {
return true;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: // 触点按下
// touchDown(event.getRawX(),event.getRawY());
touchDown(event.getX(), event.getY());
invalidate();
break;
case MotionEvent.ACTION_MOVE: // 触点移动
touchMove(event.getX(), event.getY());
invalidate();
if(time++>3&&handler!=null){
handler.sendEmptyMessage(200);
}
break;
case MotionEvent.ACTION_UP: // 触点弹起
touchUp(event.getX(), event.getY());
invalidate();
break;
default:
break;
}
return true;
}

private void touchDown(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}

private void touchMove(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
mX = x;
mY = y;
}

}

private void touchUp(float x, float y) {
mPath.lineTo(x, y);
mCanvas.drawPath(mPath, mPaint);
mPath.reset();
}

}

下载地址：
http://download.csdn.net/detail/aa5279aa/7316415