因爲company項目中需要做九宮格抽獎活動,以前都沒有做過類似的功能,雖然之前在瀏覽大神們的博客中,無意中也看到了好多關於抽獎的項目,但因爲項目中沒有需要,一直都沒有點擊進去看。這次不去看估計不行。直到公司計劃要做抽獎功能,才迫不得已上網查找demo
網上找了大半天,好不容易找到了幾個demo,下載下來,解壓縮包發現竟然裏面空空如也,只有幾張九宮格的圖片,害我白白浪費了幾個CSDN積分。後面在eoe網站那發現了一個demo,於是好開心,下載下來後馬上導入到工程中,運行看了效果,九宮格是出來了,但效果真不敢恭維,主要是運行不流暢。但我還是進去稍微看了一下demo,基本思路是這樣的:定義好九宮格界面,然後開啓子線程不斷循環修改狀態,再通過handler發送消息到主線程中修改界面(子線程不能直接修改界面)。
這個demo雖然功能上實現了,但不是我想要的效果,因爲我這一關都不能通過,到了產品那邊更加不用說了。那怎麼辦呢?
於是我想到了一個控件,叫做SurfaceView,做遊戲開發的同志們,應該對這個控件不陌生吧?首先介紹一下這個控件:
1.SurfaceView繼承於View,多用於遊戲開發中
2.可以直接在子線程中運行(其他UI控件都必須在主線程中運行的)。
3.一般的UI控件自定義時都是重寫onDraw方法,但在SurfaceView中是通過SurfaceHolder獲取Canvas來繪製圖形的
好了,來吧各位,先來看看效果圖:
這樣,下面我開始根據我的想法,把自定義九宮格的步驟說一下。
步驟:
1.計算各位方塊的位置
2.繪製每個獎品的方塊(主要讓界面更加好看)
3.繪製獎品圖
4.計算旋轉方塊的下一步位置
5.繪製旋轉方塊
6.監聽點擊開始按鈕事件
主要核心技術:
SurfaceView,SurfaceHolder
OK,有了基本步驟,接下來就是根據步驟一步一步來進行了。
在開始繪製九宮格之前,我們先重寫onMeasure方法,主要是爲了讓九宮格成爲一個正方形,這樣看起來體驗更好,基本代碼如下:
public class LotteryView extends SurfaceView{
/**
* holder
*/
private SurfaceHolder mHolder;
private List<Prize>prizes;
private boolean flags; //抽獎開關
private int lottery=6; //設置中獎號碼
private int current=2; //抽獎開始的位置
private int count=0; //旋轉次數累計
private int countDown; //倒計次數,快速旋轉完成後,需要倒計多少次循環才停止
//旋轉抽獎的方塊默認顏色
private int transfer= 0xffff0000;
private int MAX=50; //最大旋轉次數
/**
* 重新測量
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = Math.min(getMeasuredWidth(), getMeasuredHeight());
setMeasuredDimension(width, width);
}
}
SurfaceView一般不是通過重寫onDraw方法來繪製控件的,那麼怎麼獲取到Canvas呢?主要是通過SurfaceHolder監聽Callback事件來獲取的
基本代碼如下:
/**
* holder
*/
private SurfaceHolder mHolder;
public LotteryView(Context context, AttributeSet attrs) {
super(context, attrs);
mHolder = this.getHolder();
//監聽CallBack
mHolder.addCallback(this);
}
public LotteryView(Context context) {
this(context,null);
}
現在有了對象SurfaceHolder對象,我們就可以獲取到Canvas對象了,下面開始真正的繪製工作。
1.計算方塊的具體顯示位置
2.繪製每個獎品的方塊
//繪製背景
private void drawBg(Canvas canvas) {
//清除已繪製的圖形
canvas.drawColor(Color.WHITE, Mode.CLEAR);
//獲取控件的寬度,因爲要繪製九宮格,所以要平局分成三列
int width = getMeasuredWidth()/3;
int x1=0;
int y1=0;
int x2=0;
int y2=0;
int len = (int) Math.sqrt(prizes.size());
for(int x=0;x<len*len;x++){
Prize prize = prizes.get(x);
int index=x;
x1=getPaddingLeft()+width*(Math.abs(index)%len);
y1=getPaddingTop()+width*(index/len);
x2=x1+width;
y2=y1+width;
Rect rect=new Rect(x1,y1,x2,y2);
Paint paint=new Paint();
//繪製方塊
canvas.drawRect(rect, paint);
}
}
解析:prizes 是一個集合,裏面封裝了獎品的一些基本信息,x1,y1,x2,y2分別是繪製獎品容器正方形的左上頂點和右下頂點,
通過觀察發現,每一個方塊位置都有一定的關係,即 x1=getPaddingLeft()+width*(Math.abs(index)%len);
y1=getPaddingTop()+width*(index/len);
x2=x1+width;
y2=y1+width;
有了這些點的關係,就可以通過canvas.drawRect(rect, paint);繪製出方塊了
3.繪製獎品圖
//繪製獎品
private void drawPrize(Canvas canvas) {
int width = getMeasuredWidth()/3;
int x1=0;
int y1=0;
int x2=0;
int y2=0;
int len = (int) Math.sqrt(prizes.size());
for(int x=0;x<len*len;x++){
Prize prize = prizes.get(x);
int index=x;
x1=getPaddingLeft()+width*(Math.abs(index)%len);
y1=getPaddingTop()+width*(index/len);
x2=x1+width;
y2=y1+width;
Rect rect=new Rect(x1+width/6,y1+width/6,x2-width/6,y2-width/6);
prize.setRect(rect);
canvas.drawBitmap(prize.getIcon(), null, rect, null);
}
}
通過了步驟1,2知道了方塊的位置關係,就可以輕鬆的根據這些關係繪製出獎品來,Rect rect=new Rect(x1+width/6,y1+width/6,x2-width/6,y2-width/6);是讓獎品比方塊縮小一些,這樣看起來會更自然一點。
4.計算旋轉方塊的下一步位置
//下一步
public int next(int position,int len){
int current=position;
if(current+1<len){
return ++current;
}
if((current+1)%len==0&¤t<len*len-1){
return current+=len;
}
if(current%len==0){
return current-=len;
}
if(current<len*len){
return --current;
}
return current;
}
position是當前旋轉方塊的位置,len是3
5.繪製旋轉方塊
//繪製旋轉的方塊
private void drawTransfer(Canvas canvas) {
int width = getMeasuredWidth()/3;
int x1;
int y1;
int x2;
int y2;
int len = (int) Math.sqrt(prizes.size());
//得到下一步方塊的位置
current=next(current, len);
x1=getPaddingLeft()+width*(Math.abs(current)%len);
y1=getPaddingTop()+width*((current)/len);
x2=x1+width;
y2=y1+width;
Rect rect=new Rect(x1,y1,x2,y2);
Paint paint=new Paint();
paint.setColor(transfer);
canvas.drawRect(rect, paint);
}
6.監聽點擊開始按鈕事件
private OnTransferWinningListener listener;
public void setOnTransferWinningListener(OnTransferWinningListener listener){
this.listener=listener;
}
public interface OnTransferWinningListener{
/**
* 中獎回調
* @param position
*/
void onWinning(int position);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
handleTouch(event);
return super.onTouchEvent(event);
}
/**
* 觸摸
* @param event
*/
public void handleTouch(MotionEvent event) {
Point touchPoint=new Point((int)event.getX()-getLeft(),(int)event.getY());
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
Prize prize = prizes.get(Math.round(prizes.size())/2);
if(prize.isClick(touchPoint)){
if(!flags){
setStartFlags(true);
prize.click();
}
}
break ;
default:
break ;
}
}
//控制旋轉
private void controllerTransfer() {
if(count>MAX){
countDown++;
SystemClock.sleep(count*5);
}else{
SystemClock.sleep(count*2);
}
count++;
if(countDown>2){
if(lottery==current){
countDown=0;
count=0;
setStartFlags(false);
if(listener!=null){
//切換到主線程中運行
post(new Runnable() {
@Override
public void run() {
listener.onWinning(current);
}
});
}
}
}
}
至此,基本的自定義工作已經差不多了,使用demo如下:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<com.example.test.LotteryView
android:id="@+id/nl"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>
public class HomeActivity extends Activity {
LotteryView nl;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.act_home);
nl=(LotteryView) findViewById(R.id.nl);
int[]prizesIcon={R.drawable.danfan,R.drawable.meizi,R.drawable.iphone,R.drawable.f015,R.drawable.arrow,R.drawable.f040,R.drawable.ipad,R.drawable.spree_icon,R.drawable.spree_success_icon};
final List<Prize>prizes=new ArrayList<Prize>();
for(int x=0;x<9;x++){
Prize lottery=new Prize();
lottery.setId(x+1);
lottery.setName("Lottery"+(x+1));
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), prizesIcon[x]);
lottery.setIcon(bitmap);
if((x+1)%2==0){
lottery.setBgColor(0xff4fccee);
}else if(x==4){
lottery.setBgColor(0xffffffff);
}else{
lottery.setBgColor(0xff00ff34);
}
prizes.add(lottery);
}
nl.setPrizes(prizes);
nl.setOnTransferWinningListener(new OnTransferWinningListener() {
@Override
public void onWinning(int position) {
Toast.makeText(getApplicationContext(), prizes.get(position).getName(), Toast.LENGTH_SHORT).show();
}
});
}
}
運行效果非常流暢
LotteryView整體demo:
package com.example.test;
import java.util.List;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.PorterDuff;
import android.graphics.PorterDuff.Mode;
import android.graphics.Rect;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
public class LotteryView extends SurfaceView implements Callback{
/**
* holder
*/
private SurfaceHolder mHolder;
private List<Prize>prizes;
private boolean flags;
private int lottery=6; //設置中獎號碼
private int current=2; //抽獎開始的位置
private int count=0; //旋轉次數累計
private int countDown; //倒計次數,快速旋轉完成後,需要倒計多少次循環才停止
private int transfer= 0xffff0000;
private int MAX=50; //最大旋轉次數
private OnTransferWinningListener listener;
public void setOnTransferWinningListener(OnTransferWinningListener listener){
this.listener=listener;
}
public interface OnTransferWinningListener{
/**
* 中獎回調
* @param position
*/
void onWinning(int position);
}
/**
* 設置中獎號碼
* @param lottery
*/
public void setLottery(int lottery) {
if(prizes!=null&&Math.round(prizes.size()/2)==0){
throw new RuntimeException("開始抽獎按鈕不能設置爲中獎位置!");
}
this.lottery = lottery;
}
/**
* 設置轉盤顏色
* @param transfer
*/
public void setTransfer(int transfer) {
this.transfer = transfer;
}
/**
* 設置獎品集合
* @param prizes
*/
public void setPrizes(List<Prize>prizes){
this.prizes=prizes;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
handleTouch(event);
return super.onTouchEvent(event);
}
/**
* 觸摸
* @param event
*/
public void handleTouch(MotionEvent event) {
Point touchPoint=new Point((int)event.getX()-getLeft(),(int)event.getY());
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
Prize prize = prizes.get(Math.round(prizes.size())/2);
if(prize.isClick(touchPoint)){
if(!flags){
setStartFlags(true);
prize.click();
}
}
break ;
default:
break ;
}
}
private class SurfaceRunnable implements Runnable{
@Override
public void run() {
while(flags){
Canvas canvas=null;
try {
canvas = mHolder.lockCanvas();
drawBg(canvas);
drawTransfer(canvas);
drawPrize(canvas);
controllerTransfer();
} catch (Exception e) {
e.printStackTrace();
}finally{
//涓轟簡璁╂瘡嬈$粯鍒跺浘褰㈡椂鑳藉欏哄埄榪涜錛屾渶濂藉皢瑙i攣鏀懼埌寮傚父涓繘琛屽鐞嗭紝涔熷氨鏄錛屽鏋渃anvas涓嶄負絀猴紝閮藉皢鍏跺叧闂紝璁╀笅涓�嬈″驚鐜兘澶熼『鍒╄繘琛岀粯鍒�
if(canvas!=null)
mHolder.unlockCanvasAndPost(canvas);
}
}
}
}
//繪製背景
private void drawBg(Canvas canvas) {
canvas.drawColor(Color.WHITE, Mode.CLEAR);
int width = getMeasuredWidth()/3;
int x1=0;
int y1=0;
int x2=0;
int y2=0;
int len = (int) Math.sqrt(prizes.size());
for(int x=0;x<len*len;x++){
Prize prize = prizes.get(x);
int index=x;
x1=getPaddingLeft()+width*(Math.abs(index)%len);
y1=getPaddingTop()+width*(index/len);
x2=x1+width;
y2=y1+width;
Rect rect=new Rect(x1,y1,x2,y2);
Paint paint=new Paint();
paint.setColor(prize.getBgColor());
canvas.drawRect(rect, paint);
}
}
//繪製旋轉的方塊
private void drawTransfer(Canvas canvas) {
int width = getMeasuredWidth()/3;
int x1;
int y1;
int x2;
int y2;
int len = (int) Math.sqrt(prizes.size());
current=next(current, len);
x1=getPaddingLeft()+width*(Math.abs(current)%len);
y1=getPaddingTop()+width*((current)/len);
x2=x1+width;
y2=y1+width;
Rect rect=new Rect(x1,y1,x2,y2);
Paint paint=new Paint();
paint.setColor(transfer);
canvas.drawRect(rect, paint);
}
//控制旋轉
private void controllerTransfer() {
if(count>MAX){
countDown++;
SystemClock.sleep(count*5);
}else{
SystemClock.sleep(count*2);
}
count++;
if(countDown>2){
if(lottery==current){
countDown=0;
count=0;
setStartFlags(false);
if(listener!=null){
//切換到主線程中運行
post(new Runnable() {
@Override
public void run() {
listener.onWinning(current);
}
});
}
}
}
}
public void setStartFlags(boolean flags){
this.flags=flags;
}
//繪製獎品
private void drawPrize(Canvas canvas) {
int width = getMeasuredWidth()/3;
int x1=0;
int y1=0;
int x2=0;
int y2=0;
int len = (int) Math.sqrt(prizes.size());
for(int x=0;x<len*len;x++){
Prize prize = prizes.get(x);
int index=x;
x1=getPaddingLeft()+width*(Math.abs(index)%len);
y1=getPaddingTop()+width*(index/len);
x2=x1+width;
y2=y1+width;
Rect rect=new Rect(x1+width/6,y1+width/6,x2-width/6,y2-width/6);
prize.setRect(rect);
canvas.drawBitmap(prize.getIcon(), null, rect, null);
}
}
public void start() {
setLottery(getRandom());
ExecutorService service = Executors.newCachedThreadPool();
service.execute(new SurfaceRunnable());
}
//獲取隨機中獎數,實際開發中一般中獎號碼是服務器告訴我們的
private int getRandom(){
Random r=new Random();
int nextInt =r.nextInt(prizes.size());
if(nextInt%(Math.round(prizes.size()/2))==0){
//隨機號碼等於中間開始位置,需要繼續搖隨機號
return getRandom();
}
return nextInt;
}
//下一步
public int next(int position,int len){
int current=position;
if(current+1<len){
return ++current;
}
if((current+1)%len==0&¤t<len*len-1){
return current+=len;
}
if(current%len==0){
return current-=len;
}
if(current<len*len){
return --current;
}
return current;
}
public LotteryView(Context context, AttributeSet attrs) {
super(context, attrs);
mHolder = this.getHolder();
mHolder.addCallback(this);
}
public LotteryView(Context context) {
this(context,null);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
Canvas canvas=null;
try {
canvas = mHolder.lockCanvas();
drawBg(canvas);
drawPrize(canvas);
Prize prize = prizes.get(Math.round(prizes.size()/2));
prize.setListener(new Prize.OnClickListener() {
@Override
public void onClick() {
start();
}
});
} catch (Exception e) {
e.printStackTrace();
}finally{
if(canvas!=null)
mHolder.unlockCanvasAndPost(canvas);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
setStartFlags(false);
}
/**
* 重新測量
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = Math.min(getMeasuredWidth(), getMeasuredHeight());
setMeasuredDimension(width, width);
}
}