看下整體實現效果如下:
完整項目:https://github.com/buder-cp/CustomView/tree/master/buder_DN_view/buderdn12
這個效果整體可以分爲三個動畫的合集:
- 白色背景,六個小圓旋轉動畫:RotateState
- 白色背景,小圓擴散聚合動畫:MergingState
- 繪製背景圖片動畫:ExpandState
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.Log;
import android.view.View;
import android.view.animation.LinearInterpolator;
import android.view.animation.OvershootInterpolator;
public class SplashView extends View {
private ValueAnimator mAnimator;
// 大圓(裏面包含很多小圓的)的半徑
private float mRotationRadius = 90;
// 每一個小圓的半徑
private float mCircleRadius = 18;
// 小圓圈的顏色列表,在initialize方法裏面初始化
private int[] mCircleColors;
// 大圓和小圓旋轉的時間
private long mRotationDuration = 1200; //ms
// 第二部分動畫的執行總時間(包括二個動畫時間,各佔1/2)
private long mSplashDuration = 1200; //ms
// 整體的背景顏色
private int mSplashBgColor = Color.WHITE;
/**
* 參數,保存了一些繪製狀態,會被動態地改變* */
//空心圓初始半徑
private float mHoleRadius = 0F;
//當前大圓旋轉角度(弧度)
private float mCurrentRotationAngle = 0F;
//當前大圓的半徑
private float mCurrentRotationRadius = mRotationRadius;
// 繪製圓的畫筆
private Paint mPaint = new Paint();
// 繪製背景的畫筆
private Paint mPaintBackground = new Paint();
// 屏幕正中心點座標
private float mCenterX;
private float mCenterY;
//屏幕對角線一半
private float mDiagonalDist;
public SplashView(Context context) {
super(context);
init(context);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mCenterX = w/2f;
mCenterY = h/2f;
mDiagonalDist = (float) Math.sqrt((w*w+h*h))/2f;//勾股定律
}
private void init(Context context) {
mCircleColors = context.getResources().getIntArray(R.array.splash_circle_colors);
//畫筆初始化
//消除鋸齒
mPaint.setAntiAlias(true);
mPaintBackground.setAntiAlias(true);
//設置樣式---邊框樣式--描邊
mPaintBackground.setStyle(Paint.Style.STROKE);
mPaintBackground.setColor(mSplashBgColor);
}
public void splashDisappear(){
//開啓後面兩個動畫
//換模板--換狀態
if(mState!=null && mState instanceof RotateState){
//結束旋轉動畫
RotateState rotateState = (RotateState) mState;
rotateState.cancel();
post(new Runnable() {
@Override
public void run() {
mState = new MergingState();
}
});
}
}
private SplashState mState = null;
//策略模式:State---三種動畫狀態
private abstract class SplashState{
public abstract void drawState(Canvas canvas);
public void cancel(){
mAnimator.cancel();
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(mState==null){
//開啓第一個旋轉動畫
mState = new RotateState();
}
//調用繪製方法
mState.drawState(canvas);
}
/**
* 1.旋轉動畫
* 控制各個小圓的座標---控制小圓的角度變化----屬性動畫ValueAnimator
*/
private class RotateState extends SplashState{
public RotateState() {
//1.動畫的初始工作;2.開啓動畫
//花1200ms,計算某個時刻當前的角度是多少? 0~2π
mAnimator = ValueAnimator.ofFloat(0f,(float) Math.PI*2);
mAnimator.setInterpolator(new LinearInterpolator());
mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
//計算某個時刻當前的大圓旋轉了的角度是多少?
mCurrentRotationAngle = (float) valueAnimator.getAnimatedValue();
postInvalidate();
}
});
mAnimator.setDuration(mRotationDuration);
mAnimator.setRepeatCount(ValueAnimator.INFINITE);
mAnimator.start();
}
@Override
public void drawState(Canvas canvas) {
//1.背景--擦黑板,塗成白色
drawBackground(canvas);
//2.繪製小圓
drawCircles(canvas);
}
}
private void drawCircles(Canvas canvas) {
//每個小圓之間的間隔角度 = 2π/小圓的個數
float rotationAngle = (float) (2* Math.PI/mCircleColors.length);
Log.i("barry","length------:"+mCircleColors.length);
for (int i=0; i < mCircleColors.length; i++){
/**
* x = r*cos(a) +centerX
* y= r*sin(a) + centerY
* 每個小圓i*間隔角度 + 旋轉的角度 = 當前小圓的真是角度
*/
double angle = i*rotationAngle + mCurrentRotationAngle;
float cx = (float) (mCurrentRotationRadius* Math.cos(angle) + mCenterX);
float cy = (float) (mCurrentRotationRadius* Math.sin(angle) + mCenterY);
mPaint.setColor(mCircleColors[i]);
canvas.drawCircle(cx,cy,mCircleRadius,mPaint);
}
}
private void drawBackground(Canvas canvas) {
if(mHoleRadius>0f){
//得到畫筆的寬度 = 對角線/2 - 空心圓的半徑
float strokeWidth = mDiagonalDist - mHoleRadius;
mPaintBackground.setStrokeWidth(strokeWidth);
//畫圓的半徑 = 空心圓的半徑 + 畫筆的寬度/2
float radius = mHoleRadius + strokeWidth/2;
canvas.drawCircle(mCenterX,mCenterY,radius,mPaintBackground);
}else {
canvas.drawColor(mSplashBgColor);
}
}
/**
* 2.聚合動畫
* 要素:大圓的半徑不斷地變大--變小----》小圓的座標
*/
private class MergingState extends SplashState{
public MergingState() {
//花1200ms,計算某個時刻當前的大圓半徑是多少? r~0中的某個值
mAnimator = ValueAnimator.ofFloat(0, mRotationRadius);
mAnimator.setDuration(mRotationDuration);
mAnimator.setInterpolator(new OvershootInterpolator(10f));
mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
// 某個時刻當前的大圓半徑是多少?
mCurrentRotationRadius = (float)valueAnimator.getAnimatedValue();
invalidate();
}
});
mAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
mState = new ExpandState();
}
});
// mAnimator.start();
mAnimator.reverse();;
}
@Override
public void drawState(Canvas canvas) {
//1.背景--擦黑板,塗成白色
drawBackground(canvas);
//2.繪製小圓
drawCircles(canvas);
}
}
/**
* 3.水波紋擴散動畫
* 畫一個空心圓----畫一個圓,讓它的畫筆的粗細變成很大---不斷地減小畫筆的粗細。
* 空心圓變化的範圍:0~ 對角線/2
*/
private class ExpandState extends SplashState{
public ExpandState() {
//花1200ms,計算某個時刻當前的空心圓的半徑是多少? r~0中的某個值
mAnimator = ValueAnimator.ofFloat(mCircleRadius, mDiagonalDist);
mAnimator.setDuration(mRotationDuration);
mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
//當前的空心圓的半徑是多少?
mHoleRadius = (float) valueAnimator.getAnimatedValue();
invalidate();
}
});
mAnimator.start();
}
@Override
public void drawState(Canvas canvas) {
drawBackground(canvas);
}
}
}
使用:
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.FrameLayout;
public class MainActivity extends AppCompatActivity {
private FrameLayout mMainView;
private SplashView splashView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
//將動畫層蓋在實際的操作圖層上
mMainView = new FrameLayout(this);
ContentView contentView = new ContentView(this);
mMainView.addView(contentView);
splashView = new SplashView(this);
mMainView.addView(splashView);
setContentView(mMainView);
//後臺開始加載數據
startLoadData();
}
// ------------------------加載動畫--------------------------------------
Handler handler = new Handler();
private void startLoadData() {
handler.postDelayed(new Runnable() {
@Override
public void run() {
//數據加載完畢,進入主界面--->開啓後面的兩個動畫
splashView.splashDisappear();
}
},5000);//延遲時間
}
}