模擬百度紅包福袋界面實例代碼。本站提示廣大學習愛好者：（模擬百度紅包福袋界面實例代碼）文章只能為提供參考，不一定能成為您想要的結果。以下是模擬百度紅包福袋界面實例代碼正文
新年到新年到，紅包搶一直。在我搶紅包的時刻不測的發明了百度的福袋界面挺不錯的，因而抽時光專門寫篇文章來完成百度紅包界面吧。
固然啦，這其實就是解鎖界面的退化版本。不外其包括的常識點照樣挺多的，寫篇博文記載一下看看詳細有哪些技巧點啦。看看百度的後果圖：
1.編程思緒
看看界面，不難發明，其就是一個放入九張圖片的容器，繪制其實可以在其下面另創立一個通明View擔任繪制線與圓圈。上面我們將引見一下完成進程。
㈠自界說ViewGroup
我們曉得，自界說ViewGroup必定須要完成其onLayout()辦法。該辦法是設置子View地位與尺寸的時刻挪用。還有一個onMeasure()辦法，該辦法是丈量view及其內容來肯定view的寬度和高度。
㈡存儲其點與圓的地位及繪制參數
當重回界面的時刻，是不會保留上一次繪制界面的內容，必需存儲以備重繪時刻繪制到界面
㈢簡略的縮放動畫
㈣自界說View完成繪制界面
㈤繪制完成時，消除界面繪制內容，而且包管不銜接反復圖片
上面我們將完成這些步調。
2.自界說ViewGroup
開端的義務就是將九張圖片均勻散布到圖片的地位，顯示在手機界面中。其代碼以下：
public class LYJViewGroup extends ViewGroup implements LYJGestureDrawline.OnAnimationCallback{
/**
* 每一個點區域的寬度
*/
private int childWidth;
/***
* 高低文
*/
private Context context;
/***
* 保留圖片點的地位
*/
private List<LYJGesturePoint> list;
/***
* 創立view使其在ViewGroup之上。
*/
private LYJGestureView gestureDrawline;
private int baseNum = 5;
public LYJViewGroup(Context context) {
super(context);
this.context = context;
this.list = new ArrayList<>();
DisplayMetrics metric = new DisplayMetrics();
((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(metric);
childWidth = metric.widthPixels / 3; // 屏幕寬度（像素）
addChild();
// 初始化一個可以畫線的view
gestureDrawline = new LYJGestureView(context, list);
gestureDrawline.setAnimationCallback(this);
}
public void setParentView(ViewGroup parent){
// 獲得屏幕的寬度
DisplayMetrics metric = new DisplayMetrics();
((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(metric);
int width = metric.widthPixels;
LayoutParams layoutParams = new LayoutParams(width, width);
this.setLayoutParams(layoutParams);
gestureDrawline.setLayoutParams(layoutParams);
parent.addView(this);
parent.addView(gestureDrawline);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
for (int i = 0; i < getChildCount(); i++) {
//第幾行
int rowspan = i / 3;
//第幾列
int column = i % 3;
android.view.View v = getChildAt(i);
v.layout(column * childWidth + childWidth / baseNum, rowspan * childWidth + childWidth / baseNum,
column * childWidth + childWidth - childWidth / baseNum, rowspan * childWidth + childWidth - childWidth / baseNum);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// 遍歷設置每一個子view的年夜小
for (int i = 0; i < getChildCount(); i++) {
View v = getChildAt(i);
v.measure(widthMeasureSpec, heightMeasureSpec);
}
}
private void addChild() {
for (int i = 0; i < 9; i++) {
ImageView image = new ImageView(context);
image.setBackgroundResource(R.drawable.marker);
this.addView(image);
invalidate();
// 第幾行
int rowspan = i / 3;
// 第幾列
int column = i % 3;
// 界說點的左上角與右下角的坐標
int leftX = column * childWidth + childWidth / baseNum;
int topY = rowspan * childWidth + childWidth / baseNum;
int rightX = column * childWidth + childWidth - childWidth / baseNum;
int bottomY = rowspan * childWidth + childWidth - childWidth / baseNum;
LYJGesturePoint p = new LYJGesturePoint(leftX, topY, rightX,bottomY,i);
this.list.add(p);
}
}
@Override
public void startAnimationImage(int i) {
Animation animation= AnimationUtils.loadAnimation(getContext(), R.anim.gridlayout_child_scale_anim);
getChildAt(i).startAnimation(animation);
}
}
3.自界說點類
望文生義，就是為了獲得點的相干的屬性，個中基本屬性圖片左上角坐標與右下角坐標，盤算圖片中間地位以便獲得圖片中間點。狀況標志，表現該點能否繪制到圖片。上面是其實體類：
public class LYJGesturePoint {
private Point pointLeftTop;//左上角坐標
private Point pointRightBottom;//右下角坐標
private int centerX;//圖片中間點X坐標
private int centerY;//圖片中間點Y坐標
private int pointState;//能否點擊了該圖片
private int num;
public int getNum() {
return num;
}
public int getPointState() {
return pointState;
}
public void setPointState(int pointState) {
this.pointState = pointState;
}
public Point getPointLeftTop() {
return pointLeftTop;
}
public Point getPointRightBottom() {
return pointRightBottom;
}
public LYJGesturePoint(int left,int top,int right,int bottom,int i){
this.pointLeftTop=new Point(left,top);
this.pointRightBottom=new Point(right,bottom);
this.num=i;
}
public int getCenterX() {
this.centerX=(this.pointLeftTop.x+this.pointRightBottom.x)/2;
return centerX;
}
public int getCenterY() {
this.centerY=(this.pointLeftTop.y+this.pointRightBottom.y)/2;
return centerY;
}
}
4.自界說圓類
這個類較簡略就三個屬性罷了（圓中間點坐標及半徑），代碼以下：
public class LYJCirclePoint {
private int roundX;//圓中間點X坐標
private int roundY;//圓中間點Y坐標
private int radiu;//圓半徑
public int getRadiu() {
return radiu;
}
public int getRoundX() {
return roundX;
}
public int getRoundY() {
return roundY;
}
public LYJCirclePoint(int roundX,int roundY,int radiu){
this.roundX=roundX;
this.roundY=roundY;
this.radiu=radiu;
}
}
5.完成自界說繪制類View
代碼以下：
public class LYJGestureView extends android.view.View {
/***
* 聲明直線畫筆
*/
private Paint paint;
/***
* 聲明圓圈畫筆
*/
private Paint circlePaint;
/***
* 畫布
*/
private Canvas canvas;
/***
* 位圖
*/
private Bitmap bitmap;
/***
* 裝有各個view坐標的聚集，用於斷定點能否在個中
*/
private List<LYJGesturePoint> list;
/***
* 記載畫過的線
*/
private List<Pair<LYJGesturePoint, LYJGesturePoint>> lineList;
/***
* 記載畫過的圓
*/
private List<LYJCirclePoint> circlePoints;
/**
* 手指以後在哪一個Point內
*/
private LYJGesturePoint currentPoint;
/***
* 手指按下動畫
*/
private OnAnimationCallback animationCallback;
public interface OnAnimationCallback{
public void startAnimationImage(int i);
}
public void setAnimationCallback(OnAnimationCallback animationCallback) {
this.animationCallback = animationCallback;
}
public LYJGestureView(Context context, List<LYJGesturePoint> list){
super(context);
Log.i(getClass().getName(), "GestureDrawline");
paint = new Paint(Paint.DITHER_FLAG);// 創立一個畫筆
circlePaint=new Paint(Paint.DITHER_FLAG);
DisplayMetrics metric = new DisplayMetrics();
((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(metric);
Log.i(getClass().getName(), "widthPixels" + metric.widthPixels);
Log.i(getClass().getName(), "heightPixels" + metric.heightPixels);
bitmap = Bitmap.createBitmap(metric.widthPixels, metric.heightPixels, Bitmap.Config.ARGB_8888); // 設置位圖的寬高
canvas = new Canvas();
canvas.setBitmap(bitmap);
paint.setStyle(Paint.Style.STROKE);// 設置非填充
paint.setStrokeWidth(20);// 筆寬20像素
paint.setColor(Color.rgb(245, 142, 33));// 設置默許連線色彩
paint.setAntiAlias(true);// 不顯示鋸齒
circlePaint.setStyle(Paint.Style.FILL);
circlePaint.setStrokeWidth(1);
circlePaint.setAntiAlias(true);
circlePaint.setColor(Color.rgb(245, 142, 33));
this.list = list;
this.lineList = new ArrayList<>();
this.circlePoints=new ArrayList<>();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
// 斷定以後點擊的地位是處於哪一個點以內
currentPoint = getPointAt((int) event.getX(), (int) event.getY());
if (currentPoint != null) {
currentPoint.setPointState(Constants.POINT_STATE_SELECTED);
this.animationCallback.startAnimationImage(currentPoint.getNum());
canvas.drawCircle(currentPoint.getCenterX(), currentPoint.getCenterY(), 20, circlePaint);
circlePoints.add(new LYJCirclePoint(currentPoint.getCenterX(),currentPoint.getCenterY(),20));
}
invalidate();
break;
case MotionEvent.ACTION_MOVE:
clearScreenAndDrawList();
// 獲得以後挪動地位是處於哪一個點內
LYJGesturePoint pointAt = getPointAt((int) event.getX(), (int) event.getY());
if (currentPoint == null && pointAt == null) {//你把手指按在屏幕滑動，假如起點與終點都不圖片那末前往
return true;
} else {// 代表用戶的手指挪動到了點上
if (currentPoint == null) {// 先斷定以後的point是否是為null
// 假如為空，那末把手指挪動到的點賦值給currentPoint
currentPoint = pointAt;
// 把currentPoint這個點設置選中狀況;
currentPoint.setPointState(Constants.POINT_STATE_SELECTED);
}
}
//假如挪動到的點不為圖片區域或許挪動到本身的處所，或許該圖片曾經為選中狀況，直接畫直線便可以了
if(pointAt == null || currentPoint.equals(pointAt) || Constants.POINT_STATE_SELECTED == pointAt.getPointState()){
canvas.drawCircle(currentPoint.getCenterX(), currentPoint.getCenterY(), 20, circlePaint);
circlePoints.add(new LYJCirclePoint(currentPoint.getCenterX(), currentPoint.getCenterY(), 20));
canvas.drawLine(currentPoint.getCenterX(), currentPoint.getCenterY(), event.getX(), event.getY(), paint);
}else{//其他情形畫兩點相連直線，而且保留繪制圓與直線，並挪用按下圖片的縮放動畫
canvas.drawCircle(pointAt.getCenterX(),pointAt.getCenterY(),20,circlePaint);
circlePoints.add(new LYJCirclePoint(pointAt.getCenterX(), pointAt.getCenterY(), 20));
this.animationCallback.startAnimationImage(pointAt.getNum());
pointAt.setPointState(Constants.POINT_STATE_SELECTED);
canvas.drawLine(currentPoint.getCenterX(), currentPoint.getCenterY(), pointAt.getCenterX(), pointAt.getCenterY(), paint);
Pair<LYJGesturePoint, LYJGesturePoint> pair = new Pair<>(currentPoint, pointAt);
lineList.add(pair);
currentPoint=pointAt;//設置選中點為以後點。
}
invalidate();//重繪
break;
case MotionEvent.ACTION_UP:
clearScreenAndDrawList();//避免多出一條沒有起點的直線
new Handler().postDelayed(new clearLineRunnable(), 1000);//1秒後清空繪制界面
invalidate();//重繪
break;
default:
break;
}
return true;
}
class clearLineRunnable implements Runnable {
public void run() {
// 清空保留點與圓的聚集
lineList.clear();
circlePoints.clear();
// 從新繪制界面
clearScreenAndDrawList();
for (LYJGesturePoint p : list) {
//設置其為初始化不選中狀況
p.setPointState(Constants.POINT_STATE_NORMAL);
}
invalidate();
}
}
/**
* 經由過程點的地位去聚集外面查找這個點是包括在哪一個Point外面的
*
* @param x
* @param y
* @return 假如沒有找到，則前往null，代表用戶以後挪動的處所屬於點與點之間
*/
private LYJGesturePoint getPointAt(int x, int y) {
for (LYJGesturePoint point : list) {
// 先斷定點能否在圖片的X坐標內
int leftX = point.getPointLeftTop().x;
int rightX = point.getPointRightBottom().x;
if (!(x >= leftX && x < rightX)) {
// 假如為假，則跳到下一個比較
continue;
}
//在斷定點能否在圖片的Y坐標內
int topY = point.getPointLeftTop().y;
int bottomY = point.getPointRightBottom().y;
if (!(y >= topY && y < bottomY)) {
// 假如為假，則跳到下一個比較
continue;
}
// 假如履行到這，那末解釋以後點擊的點的地位在遍歷到點的地位這個處所
return point;
}
return null;
}
/**
* 清失落屏幕上一切的線，然後畫出聚集外面的線
*/
private void clearScreenAndDrawList() {
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
for (Pair<LYJGesturePoint, LYJGesturePoint> pair : lineList) {
canvas.drawLine(pair.first.getCenterX(), pair.first.getCenterY(),
pair.second.getCenterX(), pair.second.getCenterY(), paint);// 畫線
}
for(LYJCirclePoint lyjCirclePoint : circlePoints){
canvas.drawCircle(lyjCirclePoint.getRoundX(),lyjCirclePoint.getRoundY(), lyjCirclePoint.getRadiu(),circlePaint);
}
}
//繪制用bitmap創立出來的畫布
@Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(bitmap, 0, 0, null);
}
}
如許便可以獲得以下界面後果(固然反編譯百度錢包，並沒有百度錢包中的圖片，只好隨意找了一張圖片)：
