Android加載動畫系列——CircularZoomLoadingAnim
我們經常在應用中看到“正在加載中…”這樣的文案,有時候設計要求文字後面的三個小點可以閃爍,我們就來實現一下三個小點跳動的效果。
讓我們先來看看效果圖:
1、CircularZoomLoadingAnim.java源碼如下:
public class CircularZoomLoadingAnim extends View { private Paint mPaint; private float mWidth = 0f; private float mHeight = 0f; private float mMaxRadius = 8; private int circularCount = 3; private float mAnimatedValue = 1.0f; private int mJumpValue = 0; public CircularZoomLoadingAnim(Context context) { this(context, null); } public CircularZoomLoadingAnim(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CircularZoomLoadingAnim(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initPaint(); } private void initPaint() { mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setStyle(Paint.Style.FILL); mPaint.setColor(Color.WHITE); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); float circularX = mWidth / circularCount; for (int i = 0; i < circularCount; i++) { if (i == mJumpValue % circularCount) { canvas.drawCircle(i * circularX + circularX / 2f, mHeight / 2, mMaxRadius * mAnimatedValue, mPaint); } else { canvas.drawCircle(i * circularX + circularX / 2f, mHeight / 2, mMaxRadius, mPaint); } } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mWidth = getMeasuredWidth(); mHeight = getMeasuredHeight(); } public void startAnim() { stopAnim(); startViewAnim(0f, 1f, 500); } ValueAnimator valueAnimator = null; public void stopAnim() { if (valueAnimator != null) { clearAnimation(); mAnimatedValue = 0f; mJumpValue = 0; valueAnimator.setRepeatCount(0); valueAnimator.cancel(); valueAnimator.end(); } } private ValueAnimator startViewAnim(float startF, final float endF, long time) { valueAnimator = ValueAnimator.ofFloat(startF, endF); valueAnimator.setDuration(time); valueAnimator.setInterpolator(new LinearInterpolator()); valueAnimator.setRepeatCount(ValueAnimator.INFINITE); valueAnimator.setRepeatMode(ValueAnimator.RESTART); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mAnimatedValue = (float) valueAnimator.getAnimatedValue(); if (mAnimatedValue < 0.2) { mAnimatedValue = 0.2f; } invalidate(); } }); valueAnimator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); } @Override public void onAnimationRepeat(Animator animation) { super.onAnimationRepeat(animation); mJumpValue++; } @Override public void onAnimationStart(Animator animation) { super.onAnimationStart(animation); } }); if (!valueAnimator.isRunning()) { valueAnimator.start(); } return valueAnimator; } }
2、接下來我們在layout中引用自定義的動畫控件,如下所示:
<com.cyril.loadinganim.CircularZoomLoadingAnim android:id="@+id/circularzoom" android:layout_width="50dp" android:layout_height="50dp" />
3、然後在Activity中實現動畫的播放和停止,使用事例如下:
circularZoomLoadingAnim = (CircularZoomLoadingAnim) findViewById(R.id.circularzoom); circularZoomLoadingAnim.startAnim();
4、 戳這裏,小編帶你去源碼的下載地址:http://download.csdn.net/detail/zhimingshangyan/9582830