android自定义控件实现刮刮乐效果

只是简单的实现了效果，界面没怎么做优化，不过那都是次要的啦！！

其中主要的彩票视图类和橡皮擦类都是通过代码的方式构建视图，布局文件就一个主activity_main

上代码！！

主activity：

package com.guaguale;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup.LayoutParams;

import android.widget.Button;

import android.widget.RelativeLayout;

/**

 * 主activity

 * 

 * @author HaoZai

 * 

 */

public class MainActivity extends Activity {

RelativeLayout container;

Button btn;

ErinieShow erinieShow;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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

btn = (Button) findViewById(R.id.enterbtn);

btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

showEnrie();

}

});

}

private void showEnrie() {

// TODO Auto-generated method stub

// 移除所有子元素

container.removeAllViews();

// 产生一个彩票

int level = getLevel();

erinieShow = new ErinieShow(this, level);

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

}

/**

 * 获取奖励等级

 * 

 * @return

 */

private int getLevel() {

// TODO Auto-generated method stub

double d = Math.random() * 100;

if (d < 50) {

return 3;

}

if (d < 90) {

return 2;

}

return 1;

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

因为彩票视图相对复杂，所以通过自定义控件的方式，构造了一个彩票视图

package com.guaguale;

import android.content.Context;

import android.graphics.Color;

import android.view.Gravity;

import android.view.View;

import android.widget.Button;

import android.widget.RelativeLayout;

/**

 * 彩票视图类

 * 

 * @author HaoZai

 * 

 */

public class ErinieShow extends RelativeLayout {

int level;

Context mContext;

RelativeLayout rubberBG;// 最底层奖励等级

RubberShow mRubberShow;// 橡皮擦

Button mButton;

int rubberBGID = 10001;

int mButtonID = 10002;

public ErinieShow(Context context, int level) {

super(context);

// TODO Auto-generated constructor stub

this.mContext = context;

this.level = level;

getElement();// 得到子元素

setElementLP();// 设置布局参数

// 初始化彩票了

setElementStyle();

// 设置橡皮檫了

setElement();

}

private void setElement() {

// 第一步在彩票上面画一个图层

mRubberShow.beginRubber(Color.parseColor("#d3d3d3"), 30, 10);

}

private void setElementStyle() {

switch (level) {

case 1:

rubberBG.setBackgroundResource(R.drawable.ic_launcher);

break;

case 2:

rubberBG.setBackgroundResource(R.drawable.ic_launcher);

break;

case 3:

rubberBG.setBackgroundResource(R.drawable.ic_launcher);

break;

default:

break;

}

}

/**

 * 给布局的子元素设置布局参数

 */

private void setElementLP() {

// TODO Auto-generated method stub

RelativeLayout.LayoutParams rubber_bg_lp = new RelativeLayout.LayoutParams(

350, 80);

rubberBG.setLayoutParams(rubber_bg_lp);

mRubberShow.setLayoutParams(rubber_bg_lp);

// rubber_bg_lp正下方

RelativeLayout.LayoutParams rubber_btn_lp = new RelativeLayout.LayoutParams(

-2, -2);

rubber_btn_lp.addRule(RelativeLayout.CENTER_HORIZONTAL);

rubber_btn_lp.addRule(RelativeLayout.BELOW, rubberBGID);

mButton.setLayoutParams(rubber_btn_lp);

mButton.setClickable(false);

}

/**

 * 获取布局的子元素

 */

private void getElement() {

// TODO Auto-generated method stub

rubberBG = new RelativeLayout(mContext);// 得到彩票

mRubberShow = new RubberShow(mContext, level);// 得到橡皮擦

mButton = new Button(mContext);

rubberBG.setId(rubberBGID);

mButton.setId(mButtonID);

mButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

}

});

rubberBG.addView(mRubberShow);

addView(rubberBG);

addView(mButton);

}

}

橡皮檫类，用于将中奖信息上面的临时画布去掉

package com.guaguale;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Bitmap.Config;

import android.graphics.Paint.Style;

import android.graphics.Path;

import android.graphics.PorterDuff;

import android.graphics.PorterDuffXfermode;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewGroup.LayoutParams;

/**

 * 橡皮擦类

 * 

 * @author HaoZai

 * 

 */

public class RubberShow extends View {

private float TOUCH_TO_ERANCE;// 填充的最小距离，这个值越小画出来的曲线越柔和

private Bitmap bitmap;

private Canvas canvas;// 临时画布

private Paint paint;// 画笔

private Path mPath;// 鼠标的运行路径

private float mx, my;// 坐标

private boolean isDraw = false;

public RubberShow(Context context, int level) {

super(context);

// TODO Auto-generated constructor stub

}

@Override

protected void onDraw(Canvas mCanvas) {

// TODO Auto-generated method stub

super.onDraw(mCanvas);

if (isDraw) {

Log.i("tag", "111");

mCanvas.drawPath(mPath, paint);

mCanvas.drawBitmap(bitmap, 0, 0, null);// 从起点开始画

}

}

@Override

public boolean onTouchEvent(MotionEvent event) {

if (!isDraw) {

return true;

}

switch (event.getAction()) {

case MotionEvent.ACTION_DOWN:

touchDown(event.getX(), event.getY());

invalidate();// 刷新

break;

case MotionEvent.ACTION_MOVE:

touchMove(event.getX(), event.getY());

invalidate();// 刷新

break;

case MotionEvent.ACTION_UP:

touchUp(event.getX(), event.getY());

invalidate();// 刷新

break;

default:

break;

}

return true;

}

private void touchUp(float x, float y) {

// 画出路线

mPath.lineTo(x, y);

canvas.drawPath(mPath, paint);

mPath.reset();

}

private void touchMove(float x, float y) {

float dx = Math.abs(x - mx);

float dy = Math.abs(y - my);

// 两点之间的距离大于TOUCH_TO_ERANCE，就生成贝瑟尔曲线

if (dx >= TOUCH_TO_ERANCE || dy >= TOUCH_TO_ERANCE) {

// 用贝瑟尔实现平滑的曲线

// mPath.lineTo(dx, dy);

mPath.quadTo(mx, my, (x + mx) / 2, (y + my) / 2);

mx = x;

my = y;

}

}

private void touchDown(float x, float y) {

mPath.reset();// 重置路径

mPath.moveTo(x, y);

mx = x;

my = y;

}

/**

 * @param bgColor

 *            覆盖的背景颜色

 * @param paintStrokeWidth

 *            橡皮擦宽度

 * @param touchToLerance

 *            填充距离

 */

public void beginRubber(final int bgColor, final int paintStrokeWidth,

float touchToLerance) {

TOUCH_TO_ERANCE = touchToLerance;

paint = new Paint();

// 画笔划过的痕迹变为透明

paint.setColor(Color.BLACK);// 此处不能为透明

paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));

paint.setAntiAlias(true);// 变为光滑

paint.setStyle(Style.STROKE);// 空心和实心

paint.setStrokeJoin(Paint.Join.ROUND);// 前面圆角

paint.setStrokeCap(Paint.Cap.ROUND);// 后圆角

paint.setStrokeWidth(paintStrokeWidth);// 画笔宽度

// 覆盖

LayoutParams layoutParams = getLayoutParams();

int height = layoutParams.height;

int width = layoutParams.width;

// if(layoutParams.height ==LayoutParams.MATCH_PARENT){

//

// }else{

//

// }

// 记录痕迹

mPath = new Path();

bitmap = Bitmap.createBitmap(width, height, Config.ARGB_4444);// 4444占内存更少

canvas = new Canvas(bitmap);

canvas.drawColor(bgColor);

isDraw = true;

}

}

demo下载链接：http://www.apkbus.com/android-250033-1-1.html

原文链接：http://www.apkbus.com/blog-635666-59865.html