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這篇文章主要介紹如何使用Android實現紅包雨動畫效果，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
紅包雨
關于實現上面紅包雨效果步驟如下：
1.創建一個紅包實體類
public class RedPacket {
public float x, y;
public float rotation;
public float speed;
public float rotationSpeed;
public int width, height;
public Bitmap bitmap;
public int money;
public boolean isRealRed;
public RedPacket(Context context, Bitmap originalBitmap, int speed, float maxSize, float minSize, int viewWidth) {
//獲取一個顯示紅包大小的倍數
double widthRandom = Math.random();
if (widthRandom < minSize || widthRandom > maxSize) {
widthRandom = maxSize;
}
//紅包的寬度
width = (int) (originalBitmap.getWidth() * widthRandom);
//紅包的高度
height = width * originalBitmap.getHeight() / originalBitmap.getWidth();
int mWidth = (viewWidth == 0) ? context.getResources().getDisplayMetrics().widthPixels : viewWidth;
//生成紅包bitmap
bitmap = Bitmap.createScaledBitmap(originalBitmap, width, height, true);
originalBitmap.recycle();
Random random = new Random();
//紅包起始位置x:[0,mWidth-width]
int rx = random.nextInt(mWidth) - width;
x = rx <= 0 ? 0 : rx;
//紅包起始位置y
y = -height;
//初始化該紅包的下落速度
this.speed = speed + (float) Math.random() * 1000;
//初始化該紅包的初始旋轉角度
rotation = (float) Math.random() * 180 - 90;
//初始化該紅包的旋轉速度
rotationSpeed = (float) Math.random() * 90 - 45;
//初始化是否為中獎紅包
isRealRed = isRealRedPacket();
}
/**
* 判斷當前點是否包含在區域內
*/
public boolean isContains(float x, float y) {
//稍微擴大下點擊的區域
return this.x-50 < x && this.x +50 + width > x
&& this.y-50 < y && this.y+50 + height > y;
}
/**
* 隨機 是否為中獎紅包
*/
public boolean isRealRedPacket() {
Random random = new Random();
int num = random.nextInt(10) + 1;
//如果[1,10]隨機出的數字是2的倍數 為中獎紅包
if (num % 2 == 0) {
money = num*2;//中獎金額
return true;
}
return false;
}
/**
* 回收圖片
*/
public void recycle() {
if (bitmap!= null && !bitmap.isRecycled()){
bitmap.recycle();
}
}
}上面就紅包實體類的源碼，重點就是在創建紅包實體的時候，初始化紅包相關的值，如生成紅包圖片，圖片的寬高，紅包初始位置，下落速度等。比較簡單。
2.自定義紅包雨view
view初始化
public RedPacketTest(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
final TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RedPacketStyle);
//獲取xml中配置的view的style屬性，如下落紅包數量，下落的基礎速度，以及紅包圖片的最大最小范圍
count = typedArray.getInt(R.styleable.RedPacketStyle_count, 20);
speed = typedArray.getInt(R.styleable.RedPacketStyle_speed, 20);
minSize = typedArray.getFloat(R.styleable.RedPacketStyle_min_size, 0.5f);
maxSize = typedArray.getFloat(R.styleable.RedPacketStyle_max_size, 1.2f);
typedArray.recycle();
init();
}
/**
* 初始化
*/
private void init() {
//初始化畫筆
paint = new Paint();
paint.setFilterBitmap(true);
paint.setDither(true);
paint.setAntiAlias(true);
//創建一個屬性動畫，通過屬性動畫來控制刷新紅包下落的位置
animator = ValueAnimator.ofFloat(0, 1);
//繪制view開啟硬件加速
setLayerType(View.LAYER_TYPE_HARDWARE, null);
//初始化屬性動畫
initAnimator();
}
private void initAnimator() {
//每次動畫更新的時候，更新紅包下落的坐標值
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
long nowTime = System.currentTimeMillis();
//獲取兩次動畫更新之間的時間，以此來計算下落的高度
float secs = (float) (nowTime - prevTime) / 1000f;
prevTime = nowTime;
for (int i = 0; i < redpacketlist.size(); ++i) {
RedPacket redPacket = redpacketlist.get(i);
//更新紅包的下落的位置y
redPacket.y += (redPacket.speed * secs);
//如果y坐標大于view的高度 說明劃出屏幕，y重新設置起始位置，以及中獎屬性
if (redPacket.y > getHeight()) {
redPacket.y = 0 - redPacket.height;
redPacket.isRealRed = redPacket.isRealRedPacket();
}
//更新紅包的旋轉的角度
redPacket.rotation = redPacket.rotation
+ (redPacket.rotationSpeed * secs);
}
//重繪
invalidate();
}
});
//屬性動畫無限循環
animator.setRepeatCount(ValueAnimator.INFINITE);
//屬性值線性變換
animator.setInterpolator(new LinearInterpolator());
animator.setDuration(0);
}view繪制
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//獲取自定義view的寬度
mWidth = getMeasuredWidth();
}
@Override
protected void onDraw(final Canvas canvas) {
//遍歷紅包數組，繪制紅包
for (int i = 0; i < redpacketlist.size(); i++) {
RedPacket redPacket = redpacketlist.get(i);
//將紅包旋轉redPacket.rotation角度后 移動到（redPacket.x，redPacket.y）進行繪制紅包
Matrix m = new Matrix();
m.setTranslate(-redPacket.width / 2, -redPacket.height / 2);
m.postRotate(redPacket.rotation);
m.postTranslate(redPacket.width / 2 + redPacket.x, redPacket.height / 2 + redPacket.y);
//繪制紅包
canvas.drawBitmap(redPacket.bitmap, m, paint);
}
}紅包雨動畫開始結束
/**
*停止動畫
*/
public void stopRainNow() {
//清空紅包數據
clear();
//重繪
invalidate();
//動畫取消
animator.cancel();
}
/**
* 開始動畫
*/
public void startRain() {
//清空紅包數據
clear();
//添加紅包
setRedpacketCount(count);
prevTime = System.currentTimeMillis();
//動畫開始
animator.start();
}
public void setRedpacketCount(int count) {
if (mImgIds == null || mImgIds.length == 0)
return;
for (int i = 0; i < count; ++i) {
//獲取紅包原始圖片
Bitmap originalBitmap = BitmapFactory.decodeResource(getResources(), mImgIds[0]);
//生成紅包實體類
RedPacket redPacket = new RedPacket(getContext(), originalBitmap, speed,maxSize,minSize,mWidth);
//添加進入紅包數組
redpacketlist.add(redPacket);
}
}
/**
* 暫停紅包雨
*/
public void pauseRain() {
animator.cancel();
}
/**
* 重新開始
*/
public void restartRain() {
animator.start();
}
/**
* 清空紅包數據，并回收紅包中的bitmap
*/
private void clear() {
for (RedPacket redPacket :redpacketlist) {
redPacket.recycle();
}
redpacketlist.clear();
}紅包點擊事件
@Override
public boolean onTouchEvent(MotionEvent motionEvent) {
switch (motionEvent.getAction()){
case MotionEvent.ACTION_DOWN:
//根據點擊的坐標點，判斷是否點擊在紅包的區域
RedPacket redPacket = isRedPacketClick(motionEvent.getX(), motionEvent.getY());
if (redPacket != null) {
//如果點擊在紅包上，重新設置起始位置，以及中獎屬性
redPacket.y = 0 - redPacket.height;
redPacket.isRealRed = redPacket.isRealRedPacket();
if (onRedPacketClickListener != null) {
onRedPacketClickListener.onRedPacketClickListener(redPacket);
}
}
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
break;
}
return true;
}
//根據點擊坐標點，遍歷紅包數組，看是否點擊在紅包上
private RedPacket isRedPacketClick(float x, float y) {
for (int i = redpacketlist.size() - 1; i >= 0; i --) {
if (redpacketlist.get(i).isContains(x, y)) {
return redpacketlist.get(i);
}
}
return null;
}關于自定義紅包雨view的主要代碼以及分析基本完成了。下面是自定義view的使用。
3.自定義view的使用
紅包雨Activity
public class RedPacketActivity extends AppCompatActivity implements View.OnClickListener {
private RedPacketTest redRainView1;
private Button start, stop;
private TextView money;
private int totalmoney = 0;
AlertDialog.Builder ab;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.red_rain);
ab = new AlertDialog.Builder(RedPacketActivity.this);
start = (Button) findViewById(R.id.start);
stop = (Button) findViewById(R.id.stop);
money = (TextView) findViewById(R.id.money);
redRainView1 = (RedPacketTest) findViewById(R.id.red_packets_view1);
start.setOnClickListener(this);
stop.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.start) {
startRedRain();
} else if (v.getId() == R.id.stop) {
stopRedRain();
}
}
/**
* 開始下紅包雨
*/
private void startRedRain() {
redRainView1.startRain();
redRainView1.setOnRedPacketClickListener(new RedPacketTest.OnRedPacketClickListener() {
@Override
public void onRedPacketClickListener(RedPacket redPacket) {
redRainView1.pauseRain();
ab.setCancelable(false);
ab.setTitle("紅包提醒");
ab.setNegativeButton("繼續搶紅包", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
redRainView1.restartRain();
}
});
if (redPacket.isRealRed) {
ab.setMessage("恭喜你，搶到了" + redPacket.money + "元！");
totalmoney += redPacket.money;
money.setText("中獎金額: " + totalmoney);
} else {
ab.setMessage("很遺憾，下次繼續努力！");
}
redRainView1.post(new Runnable() {
@Override
public void run() {
ab.show();
}
});
}
});
}
/**
* 停止下紅包雨
*/
private void stopRedRain() {
totalmoney = 0;//金額清零
redRainView1.stopRainNow();
}紅包雨Activity的xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#80000000"> <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitXY" android:src="@drawable/red_packets_bg" /> <Button android:id="@+id/start" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="開始" /> <Button android:id="@+id/stop" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:text="結束" /> <TextView android:id="@+id/money" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:text="中獎金額:" android:textSize="18sp" android:layout_marginTop="10dp" /> <com.example.test.redpacketrain.RedPacketTest android:id="@+id/red_packets_view1" android:layout_width="match_parent" android:layout_height="match_parent" app:count="20" app:max_size="0.8" app:min_size="0.6" app:speed="500" /> </RelativeLayout>
自定義view的styleable
<resources> <declare-styleable name="RedPacketStyle"> <attr name="count" format="integer" /> <attr name="speed" format="integer" /> <attr name="max_size" format="float" /> <attr name="min_size" format="float" /> </declare-styleable> </resources>
完整的自定義view代碼
public class RedPacketTest extends View {
private int[] mImgIds = new int[]{
R.drawable.red_packets_icon
};//紅包圖片
private int count;//紅包數量
private int speed;//下落速度
private float maxSize;//紅包大小的范圍
private float minSize;//紅包大小的范圍
private int mWidth;//view寬度
private ValueAnimator animator;//屬性動畫，用該動畫來不斷改變紅包下落的坐標值
private Paint paint;//畫筆
private long prevTime;
private ArrayList<RedPacket> redpacketlist = new ArrayList<>();//紅包數組
public RedPacketTest(Context context) {
super(context);
init();
}
public RedPacketTest(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
final TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RedPacketStyle);
count = typedArray.getInt(R.styleable.RedPacketStyle_count, 20);
speed = typedArray.getInt(R.styleable.RedPacketStyle_speed, 20);
minSize = typedArray.getFloat(R.styleable.RedPacketStyle_min_size, 0.5f);
maxSize = typedArray.getFloat(R.styleable.RedPacketStyle_max_size, 1.2f);
typedArray.recycle();
init();
}
/**
* 初始化
*/
private void init() {
paint = new Paint();
paint.setFilterBitmap(true);
paint.setDither(true);
paint.setAntiAlias(true);
animator = ValueAnimator.ofFloat(0, 1);
setLayerType(View.LAYER_TYPE_HARDWARE, null);
initAnimator();
}
private void initAnimator() {
//每次動畫更新的時候，更新紅包下落的坐標值
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
long nowTime = System.currentTimeMillis();
float secs = (float) (nowTime - prevTime) / 1000f;
prevTime = nowTime;
for (int i = 0; i < redpacketlist.size(); ++i) {
RedPacket redPacket = redpacketlist.get(i);
//更新紅包的下落的位置y
redPacket.y += (redPacket.speed * secs);
//如果y坐標大于view的高度 說明劃出屏幕，y重新設置起始位置，以及中獎屬性
if (redPacket.y > getHeight()) {
redPacket.y = 0 - redPacket.height;
redPacket.isRealRed = redPacket.isRealRedPacket();
}
//更新紅包的旋轉的角度
redPacket.rotation = redPacket.rotation
+ (redPacket.rotationSpeed * secs);
}
invalidate();
}
});
//屬性動畫無限循環
animator.setRepeatCount(ValueAnimator.INFINITE);
//屬性值線性變換
animator.setInterpolator(new LinearInterpolator());
animator.setDuration(0);
}
/**
*停止動畫
*/
public void stopRainNow() {
//清空紅包數據
clear();
//重繪
invalidate();
//動畫取消
animator.cancel();
}
/**
* 開始動畫
*/
public void startRain() {
//清空紅包數據
clear();
//添加紅包
setRedpacketCount(count);
prevTime = System.currentTimeMillis();
//動畫開始
animator.start();
}
public void setRedpacketCount(int count) {
if (mImgIds == null || mImgIds.length == 0)
return;
for (int i = 0; i < count; ++i) {
//獲取紅包原始圖片
Bitmap originalBitmap = BitmapFactory.decodeResource(getResources(), mImgIds[0]);
//生成紅包實體類
RedPacket redPacket = new RedPacket(getContext(), originalBitmap, speed,maxSize,minSize,mWidth);
//添加進入紅包數組
redpacketlist.add(redPacket);
}
}
/**
* 暫停紅包雨
*/
public void pauseRain() {
animator.cancel();
}
/**
* 重新開始
*/
public void restartRain() {
animator.start();
}
/**
* 清空紅包數據，并回收紅包中的bitmap
*/
private void clear() {
for (RedPacket redPacket :redpacketlist) {
redPacket.recycle();
}
redpacketlist.clear();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//獲取自定義view的寬度
mWidth = getMeasuredWidth();
}
@Override
protected void onDraw(final Canvas canvas) {
//遍歷紅包數組，繪制紅包
for (int i = 0; i < redpacketlist.size(); i++) {
RedPacket redPacket = redpacketlist.get(i);
//將紅包旋轉redPacket.rotation角度后 移動到（redPacket.x，redPacket.y）進行繪制紅包
Matrix m = new Matrix();
m.setTranslate(-redPacket.width / 2, -redPacket.height / 2);
m.postRotate(redPacket.rotation);
m.postTranslate(redPacket.width / 2 + redPacket.x, redPacket.height / 2 + redPacket.y);
//繪制紅包
canvas.drawBitmap(redPacket.bitmap, m, paint);
}
}
@Override
public boolean onTouchEvent(MotionEvent motionEvent) {
switch (motionEvent.getAction()){
case MotionEvent.ACTION_DOWN:
//根據點擊的坐標點，判斷是否點擊在紅包的區域
RedPacket redPacket = isRedPacketClick(motionEvent.getX(), motionEvent.getY());
if (redPacket != null) {
//如果點擊在紅包上，重新設置起始位置，以及中獎屬性
redPacket.y = 0 - redPacket.height;
redPacket.isRealRed = redPacket.isRealRedPacket();
if (onRedPacketClickListener != null) {
onRedPacketClickListener.onRedPacketClickListener(redPacket);
}
}
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
break;
}
return true;
}
//根據點擊坐標點，遍歷紅包數組，看是否點擊在紅包上
private RedPacket isRedPacketClick(float x, float y) {
for (int i = redpacketlist.size() - 1; i >= 0; i --) {
if (redpacketlist.get(i).isContains(x, y)) {
return redpacketlist.get(i);
}
}
return null;
}
public interface OnRedPacketClickListener {
void onRedPacketClickListener(RedPacket redPacket);
}
private OnRedPacketClickListener onRedPacketClickListener;
public void setOnRedPacketClickListener(OnRedPacketClickListener onRedPacketClickListener) {
this.onRedPacketClickListener = onRedPacketClickListener;
}
}以上是“如何使用Android實現紅包雨動畫效果”這篇文章的所有內容，感謝各位的閱讀！希望分享的內容對大家有幫助，更多相關知識，歡迎關注億速云行業資訊頻道！
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