本文介绍了一种在Android应用中实现随机圆形气泡动画的方法，通过自定义View和动画集合，实现气泡的随机出现、移动和颜色变化，适用于各种UI场景。
Android 实现随机圆形气泡动画 点击随机变色 可自定义气泡背景颜色和文字
核心 KeywordsFlow 类：
package cn.deerlands.deerland.mvp.ui.wiget.circle_tag;
import java.util.LinkedList;
import java.util.Random;
import java.util.Vector;
import android.content.Context;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.GradientDrawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationSet;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
import android.widget.FrameLayout;
import cn.deerlands.deerland.R;
public class KeywordsFlow extends FrameLayout implements OnGlobalLayoutListener {
public static final int IDX_X = 0;
public static final int IDX_Y = 1;
public static final int IDX_TXT_LENGTH = 2;
public static final int IDX_DIS_Y = 3;
/**
* 由外至内的动画。
*/
public static final int ANIMATION_IN = 1;
/**
* 由内至外的动画。
*/
public static final int ANIMATION_OUT = 2;
/**
* 位移动画类型：从外围移动到坐标点。
*/
public static final int OUTSIDE_TO_LOCATION = 1;
/**
* 位移动画类型：从坐标点移动到外围。
*/
public static final int LOCATION_TO_OUTSIDE = 2;
/**
* 位移动画类型：从中心点移动到坐标点。
*/
public static final int CENTER_TO_LOCATION = 3;
/**
* 位移动画类型：从坐标点移动到中心点。
*/
public static final int LOCATION_TO_CENTER = 4;
public static final long ANIM_DURATION = 800l;
public static final int MAX = 9;
public static final int TEXT_SIZE_MAX = 20;
public static final int TEXT_SIZE_MIN = 10;
private OnClickListener itemClickListener;
private static Interpolator interpolator;
private static AlphaAnimation animAlpha2Opaque;
private static AlphaAnimation animAlpha2Transparent;
private static ScaleAnimation animScaleLarge2Normal, animScaleNormal2Large,
animScaleZero2Normal, animScaleNormal2Zero;
/**
* 存储显示的关键字。
*/
private Vector<String> vecKeywords;
private int width, height;
/**
* go2Show()中被赋值为true，标识开发人员触发其开始动画显示。<br/>
* 本标识的作用是防止在填充keywrods未完成的过程中获取到width和height后提前启动动画。<br/>
* 在show()方法中其被赋值为false。<br/>
* 真正能够动画显示的另一必要条件：width 和 height不为0。<br/>
*/
private boolean enableShow;
private Random random;
private int txtAnimInType, txtAnimOutType;
/**
* 最近一次启动动画显示的时间。
*/
private long lastStartAnimationTime;
/**
* 动画运行时间。
*/
private long animDuration;
private Context context;
public KeywordsFlow(Context context) {
super(context);
init();
}
public KeywordsFlow(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public KeywordsFlow(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
lastStartAnimationTime = 0l;
animDuration = ANIM_DURATION;
random = new Random();
vecKeywords = new Vector<String>(MAX);
getViewTreeObserver().addOnGlobalLayoutListener(this);
interpolator = AnimationUtils.loadInterpolator(getContext(),
android.R.anim.decelerate_interpolator);
animAlpha2Opaque = new AlphaAnimation(0.0f, 1.0f);
animAlpha2Transparent = new AlphaAnimation(1.0f, 0.0f);
animScaleLarge2Normal = new ScaleAnimation(2, 1, 2, 1);
animScaleNormal2Large = new ScaleAnimation(1, 2, 1, 2);
animScaleZero2Normal = new ScaleAnimation(0, 1, 0, 1);
animScaleNormal2Zero = new ScaleAnimation(1, 0, 1, 0);
}
public long getDuration() {
return animDuration;
}
public void setDuration(long duration) {
animDuration = duration;
}
public boolean feedKeyword(String keyword) {
boolean result = false;
if (vecKeywords.size() < MAX) {
result = vecKeywords.add(keyword);
}
return result;
}
/**
* 开始动画显示。<br/>
* 之前已经存在的TextView将会显示退出动画。<br/>
*
* @return 正常显示动画返回true；反之为false。返回false原因如下：<br/>
* 1.时间上不允许，受lastStartAnimationTime的制约；<br/>
* 2.未获取到width和height的值。<br/>
*/
public boolean go2Show(int animType) {
if (System.currentTimeMillis() - lastStartAnimationTime > animDuration) {
enableShow = true;
if (animType == ANIMATION_IN) {
txtAnimInType = OUTSIDE_TO_LOCATION;
txtAnimOutType = LOCATION_TO_CENTER;
} else if (animType == ANIMATION_OUT) {
txtAnimInType = CENTER_TO_LOCATION;
txtAnimOutType = LOCATION_TO_OUTSIDE;
}
disapper();
boolean result = show();
return result;
}
return false;
}
private void disapper() {
int size = getChildCount();
for (int i = size - 1; i >= 0; i--) {
final CircleView txv = (CircleView) getChildAt(i);
if (txv.getVisibility() == View.GONE) {
removeView(txv);
continue;
}
FrameLayout.LayoutParams layParams = (LayoutParams) txv
.getLayoutParams();
int[] xy = new int[]{layParams.leftMargin, layParams.topMargin,
txv.getWidth()};
AnimationSet animSet = getAnimationSet(xy, (width >> 1),
(height >> 1), txtAnimOutType);
txv.startAnimation(animSet);
animSet.setAnimationListener(new AnimationListener() {
public void onAnimationStart(Animation animation) {
}
public void onAnimationRepeat(Animation animation) {
}
public void onAnimationEnd(Animation animation) {
txv.setOnClickListener(null);
txv.setClickable(false);
txv.setVisibility(View.GONE);
}
});
}
}
private boolean show() {
//test
if (width > 30 && height > 30 && vecKeywords != null
&& vecKeywords.size() > 0 && enableShow) {
enableShow = false;
lastStartAnimationTime = System.currentTimeMillis();
int xCenter = width >> 1, yCenter = height >> 1;
int size = vecKeywords.size();
int xItem = width / size, yItem = height / size;
LinkedList<Integer> listX = new LinkedList<Integer>(), listY = new LinkedList<Integer>();
for (int i = 0; i < size; i++) {
// 准备随机候选数，分别对应x/y轴位置
listX.add(i * xItem);
listY.add(i * yItem + (yItem >> 2));
}
LinkedList<CircleView> listTxtTop = new LinkedList<CircleView>();
LinkedList<CircleView> listTxtBottom = new LinkedList<CircleView>();
for (int i = 0; i < size; i++) {
String keyword = vecKeywords.get(i);
// 随机位置，糙值
int xy[] = randomXY(random, listX, listY, xItem);
// 实例化TextView
final CircleView txv = new CircleView(getContext());
txv.setBackgroundResource(R.drawable.text_view_border);
txv.setGravity(Gravity.CENTER);
txv.setOnClickListener(itemClickListener);
txv.setText(keyword);
txv.setTextSize(12f);
txv.setTextColor(Color.WHITE);
txv.setPadding(40, 40, 40, 40);
txv.setSingleLine(true);
//设置背景色为随机颜色
// int r = random.nextInt(242);
// int g= random.nextInt(242);
// int b = random.nextInt(242);
//设置背景色为灰色
int r = 242;
int g = 242;
int b = 242;
int mColor = Color.rgb(r, g, b);
GradientDrawable myGrad = (GradientDrawable) txv.getBackground();
myGrad.setColor(mColor);
// txv.setBackgroundColor(mColor);
// 获取文本长度
Paint paint = txv.getPaint();
int strWidth = (int) Math.ceil(paint.measureText(keyword));
xy[IDX_TXT_LENGTH] = strWidth;
// 第一次修正:修正x坐标
if (xy[IDX_X] + strWidth > width - (xItem >> 1)) {
int baseX = width - strWidth;
// 减少文本右边缘一样的概率
xy[IDX_X] = baseX - xItem + random.nextInt(xItem >> 1);
} else if (xy[IDX_X] == 0) {
// 减少文本左边缘一样的概率
xy[IDX_X] = Math.max(random.nextInt(xItem), xItem / 3);
}
xy[IDX_DIS_Y] = Math.abs(xy[IDX_Y] - yCenter);
txv.setTag(xy);
if (xy[IDX_Y] > yCenter) {
listTxtBottom.add(txv);
} else {
listTxtTop.add(txv);
}
}
attach2Screen(listTxtTop, xCenter, yCenter, yItem);
attach2Screen(listTxtBottom, xCenter, yCenter, yItem);
return true;
}
return false;
}
/**
* 修正TextView的Y坐标将将其添加到容器上。
*/
private void attach2Screen(LinkedList<CircleView> listTxt, int xCenter,
int yCenter, int yItem) {
int size = listTxt.size();
sortXYList(listTxt, size);
for (int i = 0; i < size; i++) {
CircleView txv = listTxt.get(i);
int[] iXY = (int[]) txv.getTag();
// 第二次修正:修正y坐标
int yDistance = iXY[IDX_Y] - yCenter;
// 对于最靠近中心点的，其值不会大于yItem<br/>
// 对于可以一路下降到中心点的，则该值也是其应调整的大小<br/>
int yMove = Math.abs(yDistance);
inner:
for (int k = i - 1; k >= 0; k--) {
int[] kXY = (int[]) listTxt.get(k).getTag();
int startX = kXY[IDX_X];
int endX = startX + kXY[IDX_TXT_LENGTH];
// y轴以中心点为分隔线，在同一侧
if (yDistance * (kXY[IDX_Y] - yCenter) > 0) {
if (isXMixed(startX, endX, iXY[IDX_X], iXY[IDX_X]
+ iXY[IDX_TXT_LENGTH])) {
int tmpMove = Math.abs(iXY[IDX_Y] - kXY[IDX_Y]);
if (tmpMove > yItem) {
yMove = tmpMove;
} else if (yMove > 0) {
// 取消默认值。
yMove = 0;
}
break inner;
}
}
}
if (yMove > yItem) {
int maxMove = yMove - yItem;
int randomMove = random.nextInt(maxMove);
int realMove = Math.max(randomMove, maxMove >> 1) * yDistance
/ Math.abs(yDistance);
iXY[IDX_Y] = iXY[IDX_Y] - realMove;
iXY[IDX_DIS_Y] = Math.abs(iXY[IDX_Y] - yCenter);
// 已经调整过前i个需要再次排序
sortXYList(listTxt, i + 1);
}
FrameLayout.LayoutParams layParams = new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.WRAP_CONTENT,
FrameLayout.LayoutParams.WRAP_CONTENT);
layParams.gravity = Gravity.LEFT | Gravity.TOP;
layParams.leftMargin = iXY[IDX_X];
layParams.topMargin = iXY[IDX_Y];
addView(txv, layParams);
// 动画
AnimationSet animSet = getAnimationSet(iXY, xCenter, yCenter,
txtAnimInType);
txv.startAnimation(animSet);
}
}
public AnimationSet getAnimationSet(int[] xy, int xCenter, int yCenter,
int type) {
AnimationSet animSet = new AnimationSet(true);
animSet.setInterpolator(interpolator);
if (type == OUTSIDE_TO_LOCATION) {
animSet.addAnimation(animAlpha2Opaque);
animSet.addAnimation(animScaleLarge2Normal);
TranslateAnimation translate = new TranslateAnimation((xy[IDX_X]
+ (xy[IDX_TXT_LENGTH] >> 1) - xCenter) << 1, 0,
(xy[IDX_Y] - yCenter) << 1, 0);
animSet.addAnimation(translate);
} else if (type == LOCATION_TO_OUTSIDE) {
animSet.addAnimation(animAlpha2Transparent);
animSet.addAnimation(animScaleNormal2Large);
TranslateAnimation translate = new TranslateAnimation(0, (xy[IDX_X]
+ (xy[IDX_TXT_LENGTH] >> 1) - xCenter) << 1, 0,
(xy[IDX_Y] - yCenter) << 1);
animSet.addAnimation(translate);
} else if (type == LOCATION_TO_CENTER) {
animSet.addAnimation(animAlpha2Transparent);
animSet.addAnimation(animScaleNormal2Zero);
TranslateAnimation translate = new TranslateAnimation(0,
(-xy[IDX_X] + xCenter), 0, (-xy[IDX_Y] + yCenter));
animSet.addAnimation(translate);
} else if (type == CENTER_TO_LOCATION) {
animSet.addAnimation(animAlpha2Opaque);
animSet.addAnimation(animScaleZero2Normal);
TranslateAnimation translate = new TranslateAnimation(
(-xy[IDX_X] + xCenter), 0, (-xy[IDX_Y] + yCenter), 0);
animSet.addAnimation(translate);
}
animSet.setDuration(animDuration);
return animSet;
}
/**
* 根据与中心点的距离由近到远进行冒泡排序。
*
* @param endIdx 起始位置。
* @param listTxt 待排序的数组。
*/
private void sortXYList(LinkedList<CircleView> listTxt, int endIdx) {
for (int i = 0; i < endIdx; i++) {
for (int k = i + 1; k < endIdx; k++) {
if (((int[]) listTxt.get(k).getTag())[IDX_DIS_Y] < ((int[]) listTxt
.get(i).getTag())[IDX_DIS_Y]) {
CircleView iTmp = listTxt.get(i);
CircleView kTmp = listTxt.get(k);
listTxt.set(i, kTmp);
listTxt.set(k, iTmp);
}
}
}
}
/**
* A线段与B线段所代表的直线在X轴映射上是否有交集。
*/
private boolean isXMixed(int startA, int endA, int startB, int endB) {
boolean result = false;
if (startB >= startA && startB <= endA) {
result = true;
} else if (endB >= startA && endB <= endA) {
result = true;
} else if (startA >= startB && startA <= endB) {
result = true;
} else if (endA >= startB && endA <= endB) {
result = true;
}
return result;
}
//得到随机坐标
private int[] randomXY(Random ran, LinkedList<Integer> listX,
LinkedList<Integer> listY, int xItem) {
int[] arr = new int[4];
arr[IDX_X] = listX.remove(ran.nextInt(listX.size()));
arr[IDX_Y] = listY.remove(ran.nextInt(listY.size()));
return arr;
}
public void onGlobalLayout() {
int tmpW = getWidth();
int tmpH = getHeight();
if (width != tmpW || height != tmpH) {
width = tmpW;
height = tmpH;
show();
}
}
public Vector<String> getKeywords() {
return vecKeywords;
}
public void rubKeywords() {
vecKeywords.clear();
}
/**
* 直接清除所有的TextView。在清除之前不会显示动画。
*/
public void rubAllViews() {
removeAllViews();
}
public void setOnItemClickListener(OnClickListener listener) {
itemClickListener = listener;
}
}
CircleView类：
package cn.deerlands.deerland.mvp.ui.wiget.circle_tag;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.util.AttributeSet;
public class CircleView extends androidx.appcompat.widget.AppCompatTextView {
private Paint mBgPaint = new Paint();
PaintFlagsDrawFilter pfd = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);
public CircleView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
public CircleView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
mBgPaint.setColor(Color.WHITE);
mBgPaint.setAntiAlias(true);
}
public CircleView(Context context) {
super(context);
// TODO Auto-generated constructor stub
mBgPaint.setColor(Color.WHITE);
mBgPaint.setAntiAlias(true);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int measuredWidth = getMeasuredWidth();
int measuredHeight = getMeasuredHeight();
int max = Math.max(measuredWidth, measuredHeight);
setMeasuredDimension(max, max);
}
@Override
public void setBackgroundColor(int color) {
// TODO Auto-generated method stub
mBgPaint.setColor(color);
}
/**
* 设置通知个数显示
* @param text
*/
public void setNotifiText(int text){
// if(text>99){
// String string = 99+"+";
// setText(string);
// return;
// }
setText(text+"");
}
@Override
public void draw(Canvas canvas) {
// TODO Auto-generated method stub
canvas.setDrawFilter(pfd);
canvas.drawCircle(getWidth()/2, getHeight()/2, Math.max(getWidth(), getHeight())/2, mBgPaint);
super.draw(canvas);
}
}
text_view_border.xml
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval"
android:useLevel="false">
<solid android:color="@color/colorTextRed"/>
<stroke
android:width="1dp"
android:color="@color/white"/>
<size android:width="20dp"
android:height="20dp"/>
</shape>
activity_chose_sign.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="250dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="30dp"
android:layout_marginRight="30dp">
<cn.deerlands.deerland.mvp.ui.wiget.circle_tag.KeywordsFlow
android:id="@+id/circleFlow"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/transparent"
android:visibility="visible" />
</RelativeLayout>
</LinearLayout>
activity
private void initCircleFlow() {
KeywordsFlow circleFlow = findViewById(R.id.circleFlow);
String[] keywords = {
"吃货", "猫奴", "甜品", "佛系设计师", "理财", "文青", "画画", "吃瓜群众"
};
circleFlow.setDuration(2000);
circleFlow.setOnItemClickListener(v -> {
TextView textView = ((TextView) v);// 获得点击的标签
String keyword = textView.getText().toString();
choseTag.add(keyword);
//点击后 给标签添加随机颜色
setRandomBackgroundColor(textView);
});
// 添加
feedKeywordsFlow(circleFlow, keywords);
circleFlow.go2Show(circleFlow.ANIMATION_IN);
}
//加圆形view
private void feedKeywordsFlow(KeywordsFlow keywordsFlow, String[] arr) {
for (int i = 0; i < arr.length; i++) {
String tmp = arr[i];
keywordsFlow.feedKeyword(tmp);
}
}
private void setRandomBackgroundColor(TextView textView) {
int r = random.nextInt(242);
int g = random.nextInt(242);
int b = random.nextInt(242);
int mColor = Color.rgb(r, g, b);
GradientDrawable myGrad = (GradientDrawable) textView.getBackground();
myGrad.setColor(mColor);
}
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