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要實(shí)現(xiàn)環(huán)形ProgressBar的旋轉(zhuǎn)動(dòng)畫(huà)效果,可以通過(guò)自定義View來(lái)繪制環(huán)形ProgressBar,并使用屬性動(dòng)畫(huà)來(lái)實(shí)現(xiàn)旋轉(zhuǎn)效果。
首先,創(chuàng)建一個(gè)繼承自View的自定義View類(lèi),重寫(xiě)onDraw方法來(lái)繪制環(huán)形ProgressBar:
public class CircularProgressView extends View {
private Paint paint;
private RectF rect;
private int progress = 0;
public CircularProgressView(Context context) {
super(context);
init();
}
public CircularProgressView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public CircularProgressView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setColor(Color.BLUE);
paint.setStrokeWidth(20);
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);
rect = new RectF();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int centerX = getWidth() / 2;
int centerY = getHeight() / 2;
int radius = Math.min(centerX, centerY) - 10;
rect.set(centerX - radius, centerY - radius, centerX + radius, centerY + radius);
float angle = 360 * progress / 100;
canvas.drawArc(rect, -90, angle, false, paint);
}
public void setProgress(int progress) {
this.progress = progress;
invalidate();
}
}
然后,在Activity或Fragment中使用屬性動(dòng)畫(huà)來(lái)實(shí)現(xiàn)旋轉(zhuǎn)效果:
ObjectAnimator animator = ObjectAnimator.ofInt(circularProgressView, "progress", 0, 100);
animator.setDuration(2000);
animator.setInterpolator(new LinearInterpolator());
animator.setRepeatCount(ObjectAnimator.INFINITE);
animator.setRepeatMode(ObjectAnimator.RESTART);
animator.start();
這樣就可以實(shí)現(xiàn)環(huán)形ProgressBar的旋轉(zhuǎn)動(dòng)畫(huà)效果了??梢愿鶕?jù)具體需求調(diào)整旋轉(zhuǎn)的速度、方向和顏色等屬性。
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