突发奇想，Android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。

实现了基本的刮奖效果，并且进行了一定的封装，拷贝其中的类即可使用。

具体下载目录在 /2014年资料/5月/26日/Android实现刮奖的效果

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();

}

}